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  1. Article ; Online: Charge-Sign Dependent Cosmic-Ray Modulation Observed with the Calorimetric Electron Telescope on the International Space Station.

    Adriani, O / Akaike, Y / Asano, K / Asaoka, Y / Berti, E / Bigongiari, G / Binns, W R / Bongi, M / Brogi, P / Bruno, A / Buckley, J H / Cannady, N / Castellini, G / Checchia, C / Cherry, M L / Collazuol, G / de Nolfo, G A / Ebisawa, K / Ficklin, A W /
    Fuke, H / Gonzi, S / Guzik, T G / Hams, T / Hibino, K / Ichimura, M / Ioka, K / Ishizaki, W / Israel, M H / Kasahara, K / Kataoka, J / Kataoka, R / Katayose, Y / Kato, C / Kawanaka, N / Kawakubo, Y / Kobayashi, K / Kohri, K / Krawczynski, H S / Krizmanic, J F / Maestro, P / Marrocchesi, P S / Messineo, A M / Mitchell, J W / Miyake, S / Moiseev, A A / Mori, M / Mori, N / Motz, H M / Munakata, K / Nakahira, S / Nishimura, J / Okuno, S / Ormes, J F / Ozawa, S / Pacini, L / Papini, P / Rauch, B F / Ricciarini, S B / Sakai, K / Sakamoto, T / Sasaki, M / Shimizu, Y / Shiomi, A / Spillantini, P / Stolzi, F / Sugita, S / Sulaj, A / Takita, M / Tamura, T / Terasawa, T / Torii, S / Tsunesada, Y / Uchihori, Y / Vannuccini, E / Wefel, J P / Yamaoka, K / Yanagita, S / Yoshida, A / Yoshida, K / Zober, W V

    Physical review letters

    2023  Volume 130, Issue 21, Page(s) 211001

    Abstract: We present the observation of a charge-sign dependent solar modulation of galactic cosmic rays (GCRs) with the Calorimetric Electron Telescope onboard the International Space Station over 6 yr, corresponding to the positive polarity of the solar magnetic ...

    Abstract We present the observation of a charge-sign dependent solar modulation of galactic cosmic rays (GCRs) with the Calorimetric Electron Telescope onboard the International Space Station over 6 yr, corresponding to the positive polarity of the solar magnetic field. The observed variation of proton count rate is consistent with the neutron monitor count rate, validating our methods for determining the proton count rate. It is observed by the Calorimetric Electron Telescope that both GCR electron and proton count rates at the same average rigidity vary in anticorrelation with the tilt angle of the heliospheric current sheet, while the amplitude of the variation is significantly larger in the electron count rate than in the proton count rate. We show that this observed charge-sign dependence is reproduced by a numerical "drift model" of the GCR transport in the heliosphere. This is a clear signature of the drift effect on the long-term solar modulation observed with a single detector.
    MeSH term(s) Space Flight ; Protons ; Electrons ; Telescopes ; Cosmic Radiation
    Chemical Substances Protons
    Language English
    Publishing date 2023-06-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.130.211001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Erratum: Charge-Sign Dependent Cosmic-Ray Modulation Observed with the Calorimetric Electron Telescope on the International Space Station [Phys. Rev. Lett. 130, 211001 (2023)].

    Adriani, O / Akaike, Y / Asano, K / Asaoka, Y / Berti, E / Bigongiari, G / Binns, W R / Bongi, M / Brogi, P / Bruno, A / Buckley, J H / Cannady, N / Castellini, G / Checchia, C / Cherry, M L / Collazuol, G / de Nolfo, G A / Ebisawa, K / Ficklin, A W /
    Fuke, H / Gonzi, S / Guzik, T G / Hams, T / Hibino, K / Ichimura, M / Ioka, K / Ishizaki, W / Israel, M H / Kasahara, K / Kataoka, J / Kataoka, R / Katayose, Y / Kato, C / Kawanaka, N / Kawakubo, Y / Kobayashi, K / Kohri, K / Krawczynski, H S / Krizmanic, J F / Maestro, P / Marrocchesi, P S / Messineo, A M / Mitchell, J W / Miyake, S / Moiseev, A A / Mori, M / Mori, N / Motz, H M / Munakata, K / Nakahira, S / Nishimura, J / Okuno, S / Ormes, J F / Ozawa, S / Pacini, L / Papini, P / Rauch, B F / Ricciarini, S B / Sakai, K / Sakamoto, T / Sasaki, M / Shimizu, Y / Shiomi, A / Spillantini, P / Stolzi, F / Sugita, S / Sulaj, A / Takita, M / Tamura, T / Terasawa, T / Torii, S / Tsunesada, Y / Uchihori, Y / Vannuccini, E / Wefel, J P / Yamaoka, K / Yanagita, S / Yoshida, A / Yoshida, K / Zober, W V

    Physical review letters

    2023  Volume 131, Issue 10, Page(s) 109902

    Abstract: This corrects the article DOI: 10.1103/PhysRevLett.130.211001. ...

    Abstract This corrects the article DOI: 10.1103/PhysRevLett.130.211001.
    Language English
    Publishing date 2023-09-22
    Publishing country United States
    Document type Published Erratum
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.131.109902
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  3. Article ; Online: Direct Measurement of the Spectral Structure of Cosmic-Ray Electrons+Positrons in the TeV Region with CALET on the International Space Station.

    Adriani, O / Akaike, Y / Asano, K / Asaoka, Y / Berti, E / Bigongiari, G / Binns, W R / Bongi, M / Brogi, P / Bruno, A / Buckley, J H / Cannady, N / Castellini, G / Checchia, C / Cherry, M L / Collazuol, G / de Nolfo, G A / Ebisawa, K / Ficklin, A W /
    Fuke, H / Gonzi, S / Guzik, T G / Hams, T / Hibino, K / Ichimura, M / Ioka, K / Ishizaki, W / Israel, M H / Kasahara, K / Kataoka, J / Kataoka, R / Katayose, Y / Kato, C / Kawanaka, N / Kawakubo, Y / Kobayashi, K / Kohri, K / Krawczynski, H S / Krizmanic, J F / Maestro, P / Marrocchesi, P S / Messineo, A M / Mitchell, J W / Miyake, S / Moiseev, A A / Mori, M / Mori, N / Motz, H M / Munakata, K / Nakahira, S / Nishimura, J / Okuno, S / Ormes, J F / Ozawa, S / Pacini, L / Papini, P / Rauch, B F / Ricciarini, S B / Sakai, K / Sakamoto, T / Sasaki, M / Shimizu, Y / Shiomi, A / Spillantini, P / Stolzi, F / Sugita, S / Sulaj, A / Takita, M / Tamura, T / Terasawa, T / Torii, S / Tsunesada, Y / Uchihori, Y / Vannuccini, E / Wefel, J P / Yamaoka, K / Yanagita, S / Yoshida, A / Yoshida, K / Zober, W V

    Physical review letters

    2023  Volume 131, Issue 19, Page(s) 191001

    Abstract: Detailed measurements of the spectral structure of cosmic-ray electrons and positrons from 10.6 GeV to 7.5 TeV are presented from over 7 years of observations with the CALorimetric Electron Telescope (CALET) on the International Space Station. The ... ...

    Abstract Detailed measurements of the spectral structure of cosmic-ray electrons and positrons from 10.6 GeV to 7.5 TeV are presented from over 7 years of observations with the CALorimetric Electron Telescope (CALET) on the International Space Station. The instrument, consisting of a charge detector, an imaging calorimeter, and a total absorption calorimeter with a total depth of 30 radiation lengths at normal incidence and a fine shower imaging capability, is optimized to measure the all-electron spectrum well into the TeV region. Because of the excellent energy resolution (a few percent above 10 GeV) and the outstanding e/p separation (10^{5}), CALET provides optimal performance for a detailed search of structures in the energy spectrum. The analysis uses data up to the end of 2022, and the statistics of observed electron candidates has increased more than 3 times since the last publication in 2018. By adopting an updated boosted decision tree analysis, a sufficient proton rejection power up to 7.5 TeV is achieved, with a residual proton contamination less than 10%. The observed energy spectrum becomes gradually harder in the lower energy region from around 30 GeV, consistently with AMS-02, but from 300 to 600 GeV it is considerably softer than the spectra measured by DAMPE and Fermi-LAT. At high energies, the spectrum presents a sharp break around 1 TeV, with a spectral index change from -3.15 to -3.91, and a broken power law fitting the data in the energy range from 30 GeV to 4.8 TeV better than a single power law with 6.9 sigma significance, which is compatible with the DAMPE results. The break is consistent with the expected effects of radiation loss during the propagation from distant sources (except the highest energy bin). We have fitted the spectrum with a model consistent with the positron flux measured by AMS-02 below 1 TeV and interpreted the electron+positron spectrum with possible contributions from pulsars and nearby sources. Above 4.8 TeV, a possible contribution from known nearby supernova remnants, including Vela, is addressed by an event-by-event analysis providing a higher proton-rejection power than a purely statistical analysis.
    Language English
    Publishing date 2023-11-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.131.191001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Direct Measurement of the Cosmic-Ray Helium Spectrum from 40 GeV to 250 TeV with the Calorimetric Electron Telescope on the International Space Station.

    Adriani, O / Akaike, Y / Asano, K / Asaoka, Y / Berti, E / Bigongiari, G / Binns, W R / Bongi, M / Brogi, P / Bruno, A / Buckley, J H / Cannady, N / Castellini, G / Checchia, C / Cherry, M L / Collazuol, G / de Nolfo, G A / Ebisawa, K / Ficklin, A W /
    Fuke, H / Gonzi, S / Guzik, T G / Hams, T / Hibino, K / Ichimura, M / Ioka, K / Ishizaki, W / Israel, M H / Kasahara, K / Kataoka, J / Kataoka, R / Katayose, Y / Kato, C / Kawanaka, N / Kawakubo, Y / Kobayashi, K / Kohri, K / Krawczynski, H S / Krizmanic, J F / Maestro, P / Marrocchesi, P S / Messineo, A M / Mitchell, J W / Miyake, S / Moiseev, A A / Mori, M / Mori, N / Motz, H M / Munakata, K / Nakahira, S / Nishimura, J / Okuno, S / Ormes, J F / Ozawa, S / Pacini, L / Papini, P / Rauch, B F / Ricciarini, S B / Sakai, K / Sakamoto, T / Sasaki, M / Shimizu, Y / Shiomi, A / Spillantini, P / Stolzi, F / Sugita, S / Sulaj, A / Takita, M / Tamura, T / Terasawa, T / Torii, S / Tsunesada, Y / Uchihori, Y / Vannuccini, E / Wefel, J P / Yamaoka, K / Yanagita, S / Yoshida, A / Yoshida, K / Zober, W V

    Physical review letters

    2023  Volume 130, Issue 17, Page(s) 171002

    Abstract: We present the results of a direct measurement of the cosmic-ray helium spectrum with the CALET instrument in operation on the International Space Station since 2015. The observation period covered by this analysis spans from October 13, 2015, to April ... ...

    Abstract We present the results of a direct measurement of the cosmic-ray helium spectrum with the CALET instrument in operation on the International Space Station since 2015. The observation period covered by this analysis spans from October 13, 2015, to April 30, 2022 (2392 days). The very wide dynamic range of CALET allowed for the collection of helium data over a large energy interval, from ∼40  GeV to ∼250  TeV, for the first time with a single instrument in low Earth orbit. The measured spectrum shows evidence of a deviation of the flux from a single power law by more than 8σ with a progressive spectral hardening from a few hundred GeV to a few tens of TeV. This result is consistent with the data reported by space instruments including PAMELA, AMS-02, and DAMPE and balloon instruments including CREAM. At higher energy we report the onset of a softening of the helium spectrum around 30 TeV (total kinetic energy). Though affected by large uncertainties in the highest energy bins, the observation of a flux reduction turns out to be consistent with the most recent results of DAMPE. A double broken power law is found to fit simultaneously both spectral features: the hardening (at lower energy) and the softening (at higher energy). A measurement of the proton to helium flux ratio in the energy range from 60  GeV/n to about 60  TeV/n is also presented, using the CALET proton flux recently updated with higher statistics.
    Language English
    Publishing date 2023-05-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.130.171002
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Direct Measurement of the Nickel Spectrum in Cosmic Rays in the Energy Range from 8.8  GeV/n to 240  GeV/n with CALET on the International Space Station.

    Adriani, O / Akaike, Y / Asano, K / Asaoka, Y / Berti, E / Bigongiari, G / Binns, W R / Bongi, M / Brogi, P / Bruno, A / Buckley, J H / Cannady, N / Castellini, G / Checchia, C / Cherry, M L / Collazuol, G / Ebisawa, K / Ficklin, A W / Fuke, H /
    Gonzi, S / Guzik, T G / Hams, T / Hibino, K / Ichimura, M / Ioka, K / Ishizaki, W / Israel, M H / Kasahara, K / Kataoka, J / Kataoka, R / Katayose, Y / Kato, C / Kawanaka, N / Kawakubo, Y / Kobayashi, K / Kohri, K / Krawczynski, H S / Krizmanic, J F / Maestro, P / Marrocchesi, P S / Messineo, A M / Mitchell, J W / Miyake, S / Moiseev, A A / Mori, M / Mori, N / Motz, H M / Munakata, K / Nakahira, S / Nishimura, J / de Nolfo, G A / Okuno, S / Ormes, J F / Ospina, N / Ozawa, S / Pacini, L / Papini, P / Rauch, B F / Ricciarini, S B / Sakai, K / Sakamoto, T / Sasaki, M / Shimizu, Y / Shiomi, A / Spillantini, P / Stolzi, F / Sugita, S / Sulaj, A / Takita, M / Tamura, T / Terasawa, T / Torii, S / Tsunesada, Y / Uchihori, Y / Vannuccini, E / Wefel, J P / Yamaoka, K / Yanagita, S / Yoshida, A / Yoshida, K / Zober, W V

    Physical review letters

    2022  Volume 128, Issue 13, Page(s) 131103

    Abstract: The relative abundance of cosmic ray nickel nuclei with respect to iron is by far larger than for all other transiron elements; therefore it provides a favorable opportunity for a low background measurement of its spectrum. Since nickel, as well as iron, ...

    Abstract The relative abundance of cosmic ray nickel nuclei with respect to iron is by far larger than for all other transiron elements; therefore it provides a favorable opportunity for a low background measurement of its spectrum. Since nickel, as well as iron, is one of the most stable nuclei, the nickel energy spectrum and its relative abundance with respect to iron provide important information to estimate the abundances at the cosmic ray source and to model the Galactic propagation of heavy nuclei. However, only a few direct measurements of cosmic-ray nickel at energy larger than ∼3  GeV/n are available at present in the literature, and they are affected by strong limitations in both energy reach and statistics. In this Letter, we present a measurement of the differential energy spectrum of nickel in the energy range from 8.8  to 240  GeV/n, carried out with unprecedented precision by the Calorimetric Electron Telescope (CALET) in operation on the International Space Station since 2015. The CALET instrument can identify individual nuclear species via a measurement of their electric charge with a dynamic range extending far beyond iron (up to atomic number Z=40). The particle's energy is measured by a homogeneous calorimeter (1.2 proton interaction lengths, 27 radiation lengths) preceded by a thin imaging section (3 radiation lengths) providing tracking and energy sampling. This Letter follows our previous measurement of the iron spectrum [1O. Adriani et al. (CALET Collaboration), Phys. Rev. Lett. 126, 241101 (2021).PRLTAO0031-900710.1103/PhysRevLett.126.241101], and it extends our investigation on the energy dependence of the spectral index of heavy elements. It reports the analysis of nickel data collected from November 2015 to May 2021 and a detailed assessment of the systematic uncertainties. In the region from 20 to 240  GeV/n our present data are compatible within the errors with a single power law with spectral index -2.51±0.07.
    Language English
    Publishing date 2022-04-15
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.128.131103
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station.

    Adriani, O / Akaike, Y / Asano, K / Asaoka, Y / Berti, E / Bigongiari, G / Binns, W R / Bongi, M / Brogi, P / Bruno, A / Buckley, J H / Cannady, N / Castellini, G / Checchia, C / Cherry, M L / Collazuol, G / Ebisawa, K / Ficklin, A W / Fuke, H /
    Gonzi, S / Guzik, T G / Hams, T / Hibino, K / Ichimura, M / Ioka, K / Ishizaki, W / Israel, M H / Kasahara, K / Kataoka, J / Kataoka, R / Katayose, Y / Kato, C / Kawanaka, N / Kawakubo, Y / Kobayashi, K / Kohri, K / Krawczynski, H S / Krizmanic, J F / Maestro, P / Marrocchesi, P S / Messineo, A M / Mitchell, J W / Miyake, S / Moiseev, A A / Mori, M / Mori, N / Motz, H M / Munakata, K / Nakahira, S / Nishimura, J / de Nolfo, G A / Okuno, S / Ormes, J F / Ozawa, S / Pacini, L / Papini, P / Rauch, B F / Ricciarini, S B / Sakai, K / Sakamoto, T / Sasaki, M / Shimizu, Y / Shiomi, A / Spillantini, P / Stolzi, F / Sugita, S / Sulaj, A / Takita, M / Tamura, T / Terasawa, T / Torii, S / Tsunesada, Y / Uchihori, Y / Vannuccini, E / Wefel, J P / Yamaoka, K / Yanagita, S / Yoshida, A / Yoshida, K / Zober, W V

    Physical review letters

    2022  Volume 129, Issue 10, Page(s) 101102

    Abstract: A precise measurement of the cosmic-ray proton spectrum with the Calorimetric Electron Telescope (CALET) is presented in the energy interval from 50 GeV to 60 TeV, and the observation of a softening of the spectrum above 10 TeV is reported. The analysis ... ...

    Abstract A precise measurement of the cosmic-ray proton spectrum with the Calorimetric Electron Telescope (CALET) is presented in the energy interval from 50 GeV to 60 TeV, and the observation of a softening of the spectrum above 10 TeV is reported. The analysis is based on the data collected during ∼6.2  years of smooth operations aboard the International Space Station and covers a broader energy range with respect to the previous proton flux measurement by CALET, with an increase of the available statistics by a factor of ∼2.2. Above a few hundred GeV we confirm our previous observation of a progressive spectral hardening with a higher significance (more than 20 sigma). In the multi-TeV region we observe a second spectral feature with a softening around 10 TeV and a spectral index change from -2.6 to -2.9 consistently, within the errors, with the shape of the spectrum reported by DAMPE. We apply a simultaneous fit of the proton differential spectrum which well reproduces the gradual change of the spectral index encompassing the lower energy power-law regime and the two spectral features observed at higher energies.
    Language English
    Publishing date 2022-09-16
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.129.101102
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Measurement of the Iron Spectrum in Cosmic Rays from 10  GeV/n to 2.0  TeV/n with the Calorimetric Electron Telescope on the International Space Station.

    Adriani, O / Akaike, Y / Asano, K / Asaoka, Y / Berti, E / Bigongiari, G / Binns, W R / Bongi, M / Brogi, P / Bruno, A / Buckley, J H / Cannady, N / Castellini, G / Checchia, C / Cherry, M L / Collazuol, G / Ebisawa, K / Fuke, H / Gonzi, S /
    Guzik, T G / Hams, T / Hibino, K / Ichimura, M / Ioka, K / Ishizaki, W / Israel, M H / Kasahara, K / Kataoka, J / Kataoka, R / Katayose, Y / Kato, C / Kawanaka, N / Kawakubo, Y / Kobayashi, K / Kohri, K / Krawczynski, H S / Krizmanic, J F / Link, J / Maestro, P / Marrocchesi, P S / Messineo, A M / Mitchell, J W / Miyake, S / Moiseev, A A / Mori, M / Mori, N / Motz, H M / Munakata, K / Nakahira, S / Nishimura, J / de Nolfo, G A / Okuno, S / Ormes, J F / Ospina, N / Ozawa, S / Pacini, L / Papini, P / Rauch, B F / Ricciarini, S B / Sakai, K / Sakamoto, T / Sasaki, M / Shimizu, Y / Shiomi, A / Spillantini, P / Stolzi, F / Sugita, S / Sulaj, A / Takita, M / Tamura, T / Terasawa, T / Torii, S / Tsunesada, Y / Uchihori, Y / Vannuccini, E / Wefel, J P / Yamaoka, K / Yanagita, S / Yoshida, A / Yoshida, K

    Physical review letters

    2021  Volume 126, Issue 24, Page(s) 241101

    Abstract: The Calorimetric Electron Telescope (CALET), in operation on the International Space Station since 2015, collected a large sample of cosmic-ray iron over a wide energy interval. In this Letter a measurement of the iron spectrum is presented in the range ... ...

    Abstract The Calorimetric Electron Telescope (CALET), in operation on the International Space Station since 2015, collected a large sample of cosmic-ray iron over a wide energy interval. In this Letter a measurement of the iron spectrum is presented in the range of kinetic energy per nucleon from 10  GeV/n to 2.0  TeV/n allowing the inclusion of iron in the list of elements studied with unprecedented precision by space-borne instruments. The measurement is based on observations carried out from January 2016 to May 2020. The CALET instrument can identify individual nuclear species via a measurement of their electric charge with a dynamic range extending far beyond iron (up to atomic number Z=40). The energy is measured by a homogeneous calorimeter with a total equivalent thickness of 1.2 proton interaction lengths preceded by a thin (3 radiation lengths) imaging section providing tracking and energy sampling. The analysis of the data and the detailed assessment of systematic uncertainties are described and results are compared with the findings of previous experiments. The observed differential spectrum is consistent within the errors with previous experiments. In the region from 50  GeV/n to 2  TeV/n our present data are compatible with a single power law with spectral index -2.60±0.03.
    Language English
    Publishing date 2021-07-02
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.126.241101
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Direct Measurement of the Cosmic-Ray Carbon and Oxygen Spectra from 10  GeV/n to 2.2  TeV/n with the Calorimetric Electron Telescope on the International Space Station.

    Adriani, O / Akaike, Y / Asano, K / Asaoka, Y / Bagliesi, M G / Berti, E / Bigongiari, G / Binns, W R / Bongi, M / Brogi, P / Bruno, A / Buckley, J H / Cannady, N / Castellini, G / Checchia, C / Cherry, M L / Collazuol, G / Ebisawa, K / Fuke, H /
    Gonzi, S / Guzik, T G / Hams, T / Hibino, K / Ichimura, M / Ioka, K / Ishizaki, W / Israel, M H / Kasahara, K / Kataoka, J / Kataoka, R / Katayose, Y / Kato, C / Kawanaka, N / Kawakubo, Y / Kobayashi, K / Kohri, K / Krawczynski, H S / Krizmanic, J F / Link, J / Maestro, P / Marrocchesi, P S / Messineo, A M / Mitchell, J W / Miyake, S / Moiseev, A A / Mori, M / Mori, N / Motz, H M / Munakata, K / Nakahira, S / Nishimura, J / de Nolfo, G A / Okuno, S / Ormes, J F / Ospina, N / Ozawa, S / Pacini, L / Palma, F / Papini, P / Rauch, B F / Ricciarini, S B / Sakai, K / Sakamoto, T / Sasaki, M / Shimizu, Y / Shiomi, A / Sparvoli, R / Spillantini, P / Stolzi, F / Sugita, S / Suh, J E / Sulaj, A / Takita, M / Tamura, T / Terasawa, T / Torii, S / Tsunesada, Y / Uchihori, Y / Vannuccini, E / Wefel, J P / Yamaoka, K / Yanagita, S / Yoshida, A / Yoshida, K

    Physical review letters

    2020  Volume 125, Issue 25, Page(s) 251102

    Abstract: In this paper, we present the measurement of the energy spectra of carbon and oxygen in cosmic rays based on observations with the Calorimetric Electron Telescope on the International Space Station from October 2015 to October 2019. Analysis, including ... ...

    Abstract In this paper, we present the measurement of the energy spectra of carbon and oxygen in cosmic rays based on observations with the Calorimetric Electron Telescope on the International Space Station from October 2015 to October 2019. Analysis, including the detailed assessment of systematic uncertainties, and results are reported. The energy spectra are measured in kinetic energy per nucleon from 10  GeV/n to 2.2  TeV/n with an all-calorimetric instrument with a total thickness corresponding to 1.3 nuclear interaction length. The observed carbon and oxygen fluxes show a spectral index change of ∼0.15 around 200  GeV/n established with a significance >3σ. They have the same energy dependence with a constant C/O flux ratio 0.911±0.006 above 25  GeV/n. The spectral hardening is consistent with that measured by AMS-02, but the absolute normalization of the flux is about 27% lower, though in agreement with observations from previous experiments including the PAMELA spectrometer and the calorimetric balloon-borne experiment CREAM.
    Language English
    Publishing date 2020-09-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.125.251102
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Direct Measurement of the Cosmic-Ray Proton Spectrum from 50 GeV to 10 TeV with the Calorimetric Electron Telescope on the International Space Station.

    Adriani, O / Akaike, Y / Asano, K / Asaoka, Y / Bagliesi, M G / Berti, E / Bigongiari, G / Binns, W R / Bonechi, S / Bongi, M / Brogi, P / Bruno, A / Buckley, J H / Cannady, N / Castellini, G / Checchia, C / Cherry, M L / Collazuol, G / Di Felice, V /
    Ebisawa, K / Fuke, H / Guzik, T G / Hams, T / Hasebe, N / Hibino, K / Ichimura, M / Ioka, K / Ishizaki, W / Israel, M H / Kasahara, K / Kataoka, J / Kataoka, R / Katayose, Y / Kato, C / Kawanaka, N / Kawakubo, Y / Kohri, K / Krawczynski, H S / Krizmanic, J F / Lomtadze, T / Maestro, P / Marrocchesi, P S / Messineo, A M / Mitchell, J W / Miyake, S / Moiseev, A A / Mori, K / Mori, M / Mori, N / Motz, H M / Munakata, K / Murakami, H / Nakahira, S / Nishimura, J / de Nolfo, G A / Okuno, S / Ormes, J F / Ozawa, S / Pacini, L / Palma, F / Papini, P / Penacchioni, A V / Rauch, B F / Ricciarini, S B / Sakai, K / Sakamoto, T / Sasaki, M / Shimizu, Y / Shiomi, A / Sparvoli, R / Spillantini, P / Stolzi, F / Suh, J E / Sulaj, A / Takahashi, I / Takayanagi, M / Takita, M / Tamura, T / Terasawa, T / Tomida, H / Torii, S / Tsunesada, Y / Uchihori, Y / Ueno, S / Vannuccini, E / Wefel, J P / Yamaoka, K / Yanagita, S / Yoshida, A / Yoshida, K

    Physical review letters

    2019  Volume 122, Issue 18, Page(s) 181102

    Abstract: In this paper, we present the analysis and results of a direct measurement of the cosmic-ray proton spectrum with the CALET instrument onboard the International Space Station, including the detailed assessment of systematic uncertainties. The observation ...

    Abstract In this paper, we present the analysis and results of a direct measurement of the cosmic-ray proton spectrum with the CALET instrument onboard the International Space Station, including the detailed assessment of systematic uncertainties. The observation period used in this analysis is from October 13, 2015 to August 31, 2018 (1054 days). We have achieved the very wide energy range necessary to carry out measurements of the spectrum from 50 GeV to 10 TeV covering, for the first time in space, with a single instrument the whole energy interval previously investigated in most cases in separate subranges by magnetic spectrometers (BESS-TeV, PAMELA, and AMS-02) and calorimetric instruments (ATIC, CREAM, and NUCLEON). The observed spectrum is consistent with AMS-02 but extends to nearly an order of magnitude higher energy, showing a very smooth transition of the power-law spectral index from -2.81±0.03 (50-500 GeV) neglecting solar modulation effects (or -2.87±0.06 including solar modulation effects in the lower energy region) to -2.56±0.04 (1-10 TeV), thereby confirming the existence of spectral hardening and providing evidence of a deviation from a single power law by more than 3σ.
    Language English
    Publishing date 2019-05-31
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.122.181102
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 4' 58/153: Show issues

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    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

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    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  10. Book ; Online: A quasi-complete mechanical model for a double torsion pendulum

    De Marchi, Fabrizio / Pucacco, Giuseppe / Bassan, Massimo / De Rosa, Rosario / Di Fiore, Luciano / Garufi, Fabio / Grado, Aniello / Marconi, Lorenzo / Stanga, Ruggero / Stolzi, Francesco / Visco, Massimo

    2013  

    Abstract: We present a dynamical model for the double torsion pendulum nicknamed PETER, where one torsion pendulum hangs in cascade, but off-axis, from the other. The dynamics of interest in these devices lies around the torsional resonance, that is at very low ... ...

    Abstract We present a dynamical model for the double torsion pendulum nicknamed PETER, where one torsion pendulum hangs in cascade, but off-axis, from the other. The dynamics of interest in these devices lies around the torsional resonance, that is at very low frequencies (mHz). However, we find that, in order to properly describe the forced motion of the pendulums, also other modes must be considered, namely swinging and bouncing oscillations of the two suspended masses, that resonate at higher frequencies (Hz). Although the system has obviously 6+6 Degrees of Freedom, we find that 8 are sufficient for an accurate description of the observed motion. This model produces reliable estimates of the response to generic external disturbances and actuating forces or torques. In particular, we compute the effect of seismic floor motion (tilt noise) on the low frequency part of the signal spectra and show that it properly accounts for most of the measured low frequency noise.

    Comment: 15 pages, 6 figures
    Keywords General Relativity and Quantum Cosmology
    Subject code 612
    Publishing date 2013-03-26
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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