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  1. Book: Asymmetry inn the nonmesonic weak decay polarized 5 Lambda He hypernucleus

    Ajimura, S

    (KEK preprint ; 99-40)

    1999  

    Author's details S. Ajimura
    Series title KEK preprint ; 99-40
    Language English
    Size 12 S, graph. Darst
    Publisher High Energy Accelerator Research Organization (KEK)
    Publishing place Tsukuba
    Document type Book
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  2. Book: Polarization of 5[Lambda]He produced by the (pi+, K+) reaction

    Ajimura, S

    (KEK Preprint ; 97-226)

    1997  

    Author's details S. Ajimura
    Series title KEK Preprint ; 97-226
    Language English
    Size 13 S, Graph. Darst
    Publisher High Energy Accelerator Research Organization
    Publishing place Tsukuba
    Document type Book
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  3. Book: Measurements of the photon detection inefficiency of calorimeters between 185 and 505 MeV

    Ajimura, S

    (KEK Preprint ; 97-243)

    1997  

    Author's details S. Ajimura
    Series title KEK Preprint ; 97-243
    Language English
    Size 38 S, graph. Darst
    Publisher High Energy Accelerator Research Organization (KEK)
    Publishing place Tsukuba
    Document type Book
    Note Submitted to Nucl. Instrum. Meth. A
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  4. Book: The Lambda hypernuclear spectroscopy with the SKS spectrometer at KEK 12 GeV PS

    Ajimura, S / Aoki, K / Bhang, H

    (INS-Report ; 1054)

    1994  

    Institution Institute for Nuclear Study, University of Tokyo
    Author's details S. Ajimura; K. Aoki; H. Bhang. [Hrsg.:] Institute for Nuclear Study, University of Tokyo
    Series title INS-Report ; 1054
    Size 10 S
    Publishing place Tanashi, Tokyo
    Document type Book
    Note Invited talk at the International Conference on Hypernuclear and Strange Particle Physics (HYP94)
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  5. Book ; Online: Status Report for the 21th J-PARC PAC

    Harada, M. / Hasegawa, S. / Kasugai, Y. / Meigo, S. / Sakai, K. / Sakamoto, S. / Suzuya, K. / Iwai, E. / Maruyama, T. / Monjushiro, S. / Nishikawa, K. / Taira, M. / Niiyama, M. / Ajimura, S. / Hiraiwa, T. / Nakano, T. / Nomachi, M. / Shima, T. / Bezerra, T. J. C. /
    Chauveau, E. / Furuta, H. / Suekane, F. / Stancu, I. / Yeh, M. / Toki, W. / Ray, H. / Garvey, G. T. / Mauger, C. / Louis, W. C. / Mills, G. B. / Van de Water, R. / Spitz, J.

    Searching for a Sterile Neutrino at J-PARC MLF (J-PARC E56, JSNS2)

    2016  

    Abstract: The JSNS2 (J-PARC E56) experiment aims to search for sterile neutrinos at the J-PARC Materials and Life Sciences Experimental Facility (MLF).After the submission of a proposal to the J-PARC PAC, stage-1 approval was granted to the JSNS2 experiment. The ... ...

    Abstract The JSNS2 (J-PARC E56) experiment aims to search for sterile neutrinos at the J-PARC Materials and Life Sciences Experimental Facility (MLF).After the submission of a proposal to the J-PARC PAC, stage-1 approval was granted to the JSNS2 experiment. The approval followed a series of background measurements which were performed in 2014. Subsequent for stage-1 approval, the JSNS2 collaboration has made continuous efforts to write a Technical Design Report (TDR).This TDR will include two major items as discussed in the previous status report for the 20th J-PARC PAC: (1) A realistic detector location (2) Well understood and realistic detector performance using simulation studies, primarily in consideration of fast neutron rejection. Since August we have been in discussions with MLF staff regarding an appropriate detector location. We are also in the process of setting up a Monte Carlo (MC) simulation framework in order to study detector's performance in realistic conditions. In addition, we have pursued hardware R&D work for the liquid scintillator (LS) and to improve the dynamic range of the 10" photomultiplier tubes (PMTs). The LS R&D works includes Cherenkov studies inside the LS, and a Pulse Shape Discrimination (PSD) study with a test-beam, performed at Tohoku University. We also estimate the PSD performance of a full-sized detector using a detailed MC simulation. In this status report, we describe progress on this work.
    Keywords Physics - Instrumentation and Detectors ; High Energy Physics - Experiment
    Subject code 621
    Publishing date 2016-01-05
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  6. Article ; Online: CANDLES

    Umehara S. / Kishimoto T. / Nomachi M. / Ajimura S. / Nakatani N. / Matsuoka K. / Ichimura K. / Saka M. / Ishikawa T. / Tanaka D. / Tanaka M. / Yoshida S. / Suzuki K. / Ito G. / Kakubata H. / Wang W. / Takemoto J. / Chan W. M. / Doihara M. /
    Tamagawa Y. / Ogawa I. / Ueno T. / Maeda S. / Yamamoto A. / Tomita S. / Fujita G. / Kawamura A. / Harada T. / Fushimi K. / Hazama R. / Ohsumi H. / Okada K.

    EPJ Web of Conferences, Vol 66, p

    2014  Volume 08008

    Abstract: CANDLES is the project to search for neutrino-less double beta decay (0νββ) of 48Ca. The observation of 0νββ will prove existence of a massive Majorana neutrino. For the 0νββ measurement, we need a low background condition because of a low decay rate of ... ...

    Abstract CANDLES is the project to search for neutrino-less double beta decay (0νββ) of 48Ca. The observation of 0νββ will prove existence of a massive Majorana neutrino. For the 0νββ measurement, we need a low background condition because of a low decay rate of 0νββ. Now we installed the CANDLES III system at the Kamioka underground laboratory. The CANDLES III system realizes the low background condition by a characteristic structure and data analyses for background rejection. Here we report performances of the CANDLES III system.
    Keywords Physics ; QC1-999 ; Science ; Q
    Language English
    Publishing date 2014-03-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  7. Article ; Online: Interference Effect between ϕ and Λ(1520) Production Channels in the γp→K^{+}K^{-}p Reaction near Threshold.

    Ryu, S Y / Ahn, J K / Nakano, T / Ahn, D S / Ajimura, S / Akimune, H / Asano, Y / Chang, W C / Chen, J Y / Daté, S / Ejiri, H / Fujimura, H / Fujiwara, M / Fukui, S / Hasegawa, S / Hicks, K / Horie, K / Hotta, T / Hwang, S H /
    Imai, K / Ishikawa, T / Iwata, T / Kato, Y / Kawai, H / Kino, K / Kohri, H / Kon, Y / Kumagai, N / Lin, P J / Maeda, Y / Makino, S / Matsuda, T / Matsuoka, N / Mibe, T / Miyabe, M / Miyachi, M / Morino, Y / Muramatsu, N / Murayama, R / Nakatsugawa, Y / Nam, S I / Niiyama, M / Nomachi, M / Ohashi, Y / Ohkuma, H / Ohta, T / Ooba, T / Oshuev, D S / Parker, J D / Rangacharyulu, C / Sakaguchi, A / Sawada, T / Shagin, P M / Shiino, Y / Shimizu, H / Strokovsky, E A / Sugaya, Y / Sumihama, M / Tokiyasu, A O / Toi, Y / Toyokawa, H / Tsunemi, T / Uchida, M / Ungaro, M / Wakai, A / Wang, C W / Wang, S C / Yonehara, K / Yorita, T / Yoshimura, M / Yosoi, M / Zegers, R G T

    Physical review letters

    2016  Volume 116, Issue 23, Page(s) 232001

    Abstract: The ϕ-Λ(1520) interference effect in the γp→K^{+}K^{-}p reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between ϕ and Λ(1520) production amplitudes were obtained in the kinematic region where ...

    Abstract The ϕ-Λ(1520) interference effect in the γp→K^{+}K^{-}p reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between ϕ and Λ(1520) production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support strong constructive interference when K^{+}K^{-} pairs are observed at forward angles but destructive interference for proton emission at forward angles. Furthermore, the observed interference effect does not account for the sqrt[s]=2.1  GeV bump structure in forward differential cross sections for ϕ photoproduction. This fact suggests possible exotic structures such as a hidden-strangeness pentaquark state, a new Pomeron exchange, or rescattering processes via other hyperon states.
    Language English
    Publishing date 2016-06-10
    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.116.232001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Proton energy spectra in the nonmesonic weak decay of 12lambdaC and 28lambdaSi hypernuclei.

    Hashimoto, O / Ajimura, S / Aoki, K / Bhang, H / Hasegawa, T / Hotchi, H / Kim, Y D / Kishimoto, T / Maeda, K / Noumi, H / Ohta, Y / Omata, K / Outa, H / Park, H / Sato, Y / Sekimoto, M / Shibata, T / Takahashi, T / Youn, M

    Physical review letters

    2002  Volume 88, Issue 4, Page(s) 42503

    Abstract: Numbers of protons per Gamma hypernuclear weak decay were measured as a function of proton energy above 40 MeV, explicitly identifying production of Gamma hypernuclei by the (pi+,K+) reaction. The ratios between the neutron-stimulated to proton- ... ...

    Abstract Numbers of protons per Gamma hypernuclear weak decay were measured as a function of proton energy above 40 MeV, explicitly identifying production of Gamma hypernuclei by the (pi+,K+) reaction. The ratios between the neutron-stimulated to proton-stimulated nonmesonic decay widths, Gamma((Lambda)n-->nn)/Gamma((Lambda)p-->np) ( = Gamma(n)/Gamma(p)) were extracted by fitting the proton energy spectra. The present result claims that the proton yields are suppressed and the Gamma(n)/Gamma(p) ratios are close to 1 both for 12LambdaC and 28LambdaSi in contradiction to theoretical expectations based on meson exchange models.
    Language English
    Publishing date 2002-01-28
    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.88.042503
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Three-body nonmesonic weak decay of the (Lambda)12C hypernucleus.

    Kim, M / Ajimura, S / Aoki, K / Banu, A / Bhang, H / Fukuda, T / Hashimoto, O / Hwang, J I / Kameoka, S / Kang, B H / Kim, E / Kim, J H / Maruta, T / Miura, Y / Miyake, Y / Nagae, T / Nakamura, M / Nakamura, S N / Noumi, H /
    Okada, S / Okayasu, Y / Outa, H / Park, H / Saha, P K / Sato, Y / Sekimoto, M / Takahashi, T / Tamura, H / Tanida, K / Toyoda, A / Tshoo, K / Tsukada, K / Watanabe, T / Yim, H J

    Physical review letters

    2009  Volume 103, Issue 18, Page(s) 182502

    Abstract: We have measured the branching ratio of the three-body process in the nonmesonic weak decay of Lambda12C to be 0.29+/-0.13. This result was obtained by reproducing the nucleon and the nucleon pair yields introducing a measured final state interaction. At ...

    Abstract We have measured the branching ratio of the three-body process in the nonmesonic weak decay of Lambda12C to be 0.29+/-0.13. This result was obtained by reproducing the nucleon and the nucleon pair yields introducing a measured final state interaction. At the same time, we have determined the absolute decay widths, Gamma(n) and Gamma(p), along with Gamma2N, whose relative ratio has been a long-standing puzzle. Including the three-body process, we have successfully reproduced the nucleon energy distribution, the coincidence two-nucleon angular correlation, and the momentum sum distribution simultaneously.
    Language English
    Publishing date 2009-10-30
    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.103.182502
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Hypernuclear fine structure in (9)(lambda)Be.

    Akikawa, H / Ajimura, S / Chrien, R E / Eugenio, P M / Franklin, G B / Franz, J / Gang, L / Imai, K / Khaustov, P / May, M / Pile, P H / Quinn, B / Rusek, A / Sasao, J / Sawafta, R I / Schmitt, H / Tamura, H / Tang, L / Tanida, K /
    Yuan, L / Zhou, S H / Zhu, L H / Zhu, X F

    Physical review letters

    2002  Volume 88, Issue 8, Page(s) 82501

    Abstract: With a germanium detector array (Hyperball), we observed two gamma-ray peaks corresponding to the two transitions (5/2(+)-->1/2(+) and 3/2(+)-->1/2(+)) in the (9)(Lambda)Be hypernucleus which was produced by the 9Be(K-,pi(-)) reaction. The energies of ... ...

    Abstract With a germanium detector array (Hyperball), we observed two gamma-ray peaks corresponding to the two transitions (5/2(+)-->1/2(+) and 3/2(+)-->1/2(+)) in the (9)(Lambda)Be hypernucleus which was produced by the 9Be(K-,pi(-)) reaction. The energies of the gamma rays are 3029 +/- 2 +/- 1 keV and 3060 +/- 2 +/- 1 keV. The energy difference was measured to be 31.4(+2.5)(-3.6) keV, which indicates a very small Lambda-spin-dependent spin-orbit force between a Lambda and a nucleon. This is the smallest level splitting by far ever measured in a hypernucleus.
    Language English
    Publishing date 2002-02-25
    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.88.082501
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