Result 1 - 10 of total 69
EPJ Web of Conferences, Vol 96, p
2015 Volume 00001
| Keywords | Science ; Q ; Physics ; QC1-999 |
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| Publishing date | 2015-01-01T00:00:00Z |
| Publisher | EDP Sciences |
| Document type | Article ; Online |
| Database | BASE - Bielefeld Academic Search Engine (life sciences selection) |
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2018 Volume 121, Issue 4, Page(s) 41802
Abstract: A novel mechanism to produce and detect light dark matter in experiments making use of GeV electrons (and positrons) impinging on a thick target (beam dump) is proposed. The positron-rich environment produced by the electromagnetic shower allows us to ... ...
| Abstract | A novel mechanism to produce and detect light dark matter in experiments making use of GeV electrons (and positrons) impinging on a thick target (beam dump) is proposed. The positron-rich environment produced by the electromagnetic shower allows us to produce an A^{'} via nonresonant (e^{+}+e^{-}→γ+A^{'}) and resonant (e^{+}+e^{-}→A^{'}) annihilation on atomic electrons. The latter mechanism, for some selected kinematics, results in a larger sensitivity with respect to limits derived by the commonly used A^{'}-strahlung. This idea, applied to beam-dump experiments and active beam-dump experiments, pushes down the current limits by an order of magnitude. |
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| Language | English |
| Publishing date | 2018-07-27 |
| 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.121.041802 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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Genova, Italy, 3 - 6 July 2002
2003
| Title variant | GDH2002 |
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| Institution | International Symposium on the Gerasimov-Drell-Hearn Sum Rule and the Spin Structure of the Nucleon |
| Event/congress | International Symposium on the Gerasimov-Drell-Hearn Sum Rule and the Spin Structure of the Nucleon (2, 2002.07.03-06, Genova) |
| Author's details | eds.: M. Anghinolfi; M. Battaglieri |
| Language | English |
| Size | XV, 429 S, Ill., graph. Darst |
| Publisher | World Scientifc |
| Publishing place | Singapore u.a. |
| Document type | Book ; Conference proceedings |
| Note | Literaturangaben |
| ISBN | 9812383972 ; 9789812383976 |
| Database | Library catalogue of the German National Library of Science and Technology (TIB), Hannover |
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2022 Volume 12, Issue 1, Page(s) 19978
Abstract: The eruption of the Hunga-Tonga volcano in the South Pacific Ocean on January 15, 2022, at about 4:15 UTC, generated a violent explosion, which created atmospheric pressure disturbances in the form of Rayleigh-Lamb waves detected all over the globe. Here ...
| Abstract | The eruption of the Hunga-Tonga volcano in the South Pacific Ocean on January 15, 2022, at about 4:15 UTC, generated a violent explosion, which created atmospheric pressure disturbances in the form of Rayleigh-Lamb waves detected all over the globe. Here we discuss the observation of the Hunga-Tonga shock-wave performed at the Ny-Ålesund Research Station on the Spitsbergen island, by the detectors of the PolarquEEEst experiment and their ancillary sensors. Online pressure data as well as the results of dedicated offline analysis are presented and discussed in details. Results include wave arrival times, wave amplitude measurements and wave velocity calculation. We observed five passages of the shock wave with a significance larger than 3 [Formula: see text] and an amplitude up to 1 hPa. The average propagation velocity resulted to be (308 ± 0.6) m/s. Possible effects of the atmospheric pressure variation associated with the shock-wave multiple passages on the cosmic-ray rate at ground level are also investigated. We did not find any significant evidence of this effect. |
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| Language | English |
| Publishing date | 2022-11-20 |
| Publishing country | England |
| Document type | Journal Article |
| ZDB-ID | 2615211-3 |
| ISSN | 2045-2322 ; 2045-2322 |
| ISSN (online) | 2045-2322 |
| ISSN | 2045-2322 |
| DOI | 10.1038/s41598-022-23984-2 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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1998 Volume 90, Issue 2, Page(s) 308–316
Abstract: In a geriatric hospital in Milan, with over 1000 beds and 750 healthcare workers (with different skills and training), by means of an accident register, during 1997 an 11% incidence of acute low back pain was recorded, with a mean of 19 days absence from ...
| Title translation | The assessment of exposure to the risk of the manual lifting of patients. The results of a clinical study in a geriatric institute of Milan. |
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| Abstract | In a geriatric hospital in Milan, with over 1000 beds and 750 healthcare workers (with different skills and training), by means of an accident register, during 1997 an 11% incidence of acute low back pain was recorded, with a mean of 19 days absence from work. For this reason, special attention was given to the assessment of manual patient handling risk and to the consequent effects on the lumbar spine using, for the purpose, the method proposed by the EPM Research Unit. Of the 10 wards analysed none showed a negligible exposure index (MAPO Index < 1.5), only one was in the medium exposure class (MAPO Index = 3.05) and the other 9 wards had high exposure (MAPO Index 5.63-24). A group of 59 men (mean age 35.6 years and mean job seniority 9 years) and 179 women (mean age 36.7 years and mean job seniority 10 years) were examined. The most significant result of the physical examination was the high prevalence of subjects who reported at least one episode of acute low back pain in the previous 12 months (16). This was double the prevalence for the country as a whole (8.3%) and 7 times greater compared to the group not exposed to manual load handling risk (2.3%). The prevalence of degenerative disorders of the lumbar spine in the group under study (4.2%) was also analysed, and is of particular interest if associated with the difficulties in completing the diagnostic process. Lastly, 6.3% of the subjects examined were judged unfit (temporarily of permanently) for work involving manual handling of patients. |
| MeSH term(s) | Adolescent ; Adult ; Age Distribution ; Aged ; Female ; Homes for the Aged/manpower ; Homes for the Aged/statistics & numerical data ; Humans ; Italy/epidemiology ; Lifting/adverse effects ; Male ; Middle Aged ; Occupational Diseases/epidemiology ; Occupational Diseases/etiology ; Occupational Exposure/adverse effects ; Occupational Exposure/statistics & numerical data ; Prevalence ; Risk Assessment/methods ; Risk Assessment/statistics & numerical data ; Risk Factors ; Sex Distribution ; Spinal Diseases/epidemiology ; Spinal Diseases/etiology |
| Language | Italian |
| Publishing date | 1998-07-21 |
| Publishing country | Italy |
| Document type | Journal Article |
| ZDB-ID | 123678-7 |
| ISSN | 0025-7818 |
| ISSN | 0025-7818 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
| Un I Zs.265: Show issues | Location: Je nach Verfügbarkeit (siehe Angabe bei Bestand) bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular ab Jg. 2022: Lesesaal (EG) |
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| Zs.MO 395: Show issues |
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2023 Volume 131, Issue 2, Page(s) 21901
Abstract: The polarized cross-section ratio σ_{LT^{'}}/σ_{0} from hard exclusive π^{-}Δ^{++} electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin asymmetry measurements using a 10.2 GeV/10.6 GeV incident electron beam and ... ...
| Abstract | The polarized cross-section ratio σ_{LT^{'}}/σ_{0} from hard exclusive π^{-}Δ^{++} electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin asymmetry measurements using a 10.2 GeV/10.6 GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. The study, which provides the first observation of this channel in the deep-inelastic regime, focuses on very forward-pion kinematics in the valence regime, and photon virtualities ranging from 1.5 GeV^{2} up to 7 GeV^{2}. The reaction provides a novel access to the d-quark content of the nucleon and to p→Δ^{++} transition generalized parton distributions. A comparison to existing results for hard exclusive π^{+}n and π^{0}p electroproduction is provided, which shows a clear impact of the excitation mechanism, encoded in transition generalized parton distributions, on the asymmetry. |
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| Language | English |
| Publishing date | 2023-07-28 |
| 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.131.021901 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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2023
Abstract: The Electron-Ion Collider (EIC), a state-of-the-art facility for studying the strong force, is expected to begin commissioning its first experiments in 2028. This is an opportune time for artificial intelligence (AI) to be included from the start at this ...
| Abstract | The Electron-Ion Collider (EIC), a state-of-the-art facility for studying the strong force, is expected to begin commissioning its first experiments in 2028. This is an opportune time for artificial intelligence (AI) to be included from the start at this facility and in all phases that lead up to the experiments. The second annual workshop organized by the AI4EIC working group, which recently took place, centered on exploring all current and prospective application areas of AI for the EIC. This workshop is not only beneficial for the EIC, but also provides valuable insights for the newly established ePIC collaboration at EIC. This paper summarizes the different activities and R&D projects covered across the sessions of the workshop and provides an overview of the goals, approaches and strategies regarding AI/ML in the EIC community, as well as cutting-edge techniques currently studied in other experiments. Comment: 27 pages, 11 figures, AI4EIC workshop, tutorials and hackathon |
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| Keywords | Physics - Accelerator Physics ; Computer Science - Machine Learning ; High Energy Physics - Experiment ; Nuclear Experiment ; Nuclear Theory |
| Publishing date | 2023-07-17 |
| Publishing country | us |
| Document type | Book ; Online |
| Database | BASE - Bielefeld Academic Search Engine (life sciences selection) |
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2022 Volume 127, Issue 27, Page(s) 272303
Abstract: Strange matter is believed to exist in the cores of neutron stars based on simple kinematics. If this is true, then hyperon-nucleon interactions will play a significant part in the neutron star equation of state. Yet, compared to other elastic scattering ...
| Abstract | Strange matter is believed to exist in the cores of neutron stars based on simple kinematics. If this is true, then hyperon-nucleon interactions will play a significant part in the neutron star equation of state. Yet, compared to other elastic scattering processes, there is very little data on Λ-N scattering. This experiment utilized the CEBAF Large Acceptance Spectrometer (CLAS) detector to study the Λp→Λp elastic scattering cross section in the incident Λ momentum range 0.9-2.0 GeV/c. These are the first data on this reaction since the 1970s. The new cross sections have significantly better accuracy and precision than the existing world data, and the techniques developed here can also be used in future experiments. |
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| Language | English |
| Publishing date | 2022-01-21 |
| 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.127.272303 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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2022 Volume 127, Issue 26, Page(s) 262501
Abstract: We present the first measurement of the timelike Compton scattering process, γp→p^{'}γ^{*}(γ^{*}→e^{+}e^{-}), obtained with the CLAS12 detector at Jefferson Lab. The photon beam polarization and the decay lepton angular asymmetries are reported in the ... ...
| Abstract | We present the first measurement of the timelike Compton scattering process, γp→p^{'}γ^{*}(γ^{*}→e^{+}e^{-}), obtained with the CLAS12 detector at Jefferson Lab. The photon beam polarization and the decay lepton angular asymmetries are reported in the range of timelike photon virtualities 2.25<Q^{'2}<9 GeV^{2}, squared momentum transferred 0.1<-t<0.8 GeV^{2}, and average total center-of-mass energy squared s=14.5 GeV^{2}. The photon beam polarization asymmetry, similar to the beam-spin asymmetry in deep virtual Compton scattering, is sensitive to the imaginary part of the Compton form factors and provides a way to test the universality of the generalized parton distributions. The angular asymmetry of the decay leptons accesses the real part of the Compton form factors and thus the D-term in the parametrization of the generalized parton distributions.<br /> |
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| Language | English |
| Publishing date | 2022-01-14 |
| 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.127.262501 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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2022 Volume 129, Issue 18, Page(s) 182501
Abstract: We present the first measurement of dihadron angular correlations in electron-nucleus scattering. The data were taken with the CLAS detector and a 5.0 GeV electron beam incident on deuterium, carbon, iron, and lead targets. Relative to deuterium, the ... ...
| Abstract | We present the first measurement of dihadron angular correlations in electron-nucleus scattering. The data were taken with the CLAS detector and a 5.0 GeV electron beam incident on deuterium, carbon, iron, and lead targets. Relative to deuterium, the nuclear yields of charged-pion pairs show a strong suppression for azimuthally opposite pairs, no suppression for azimuthally nearby pairs, and an enhancement of pairs with large invariant mass. These effects grow with increased nuclear size. The data are qualitatively described by the gibuu model, which suggests that hadrons form near the nuclear surface and undergo multiple scattering in nuclei.These results show that angular correlation studies can open a new way to elucidate how hadrons form and interact inside nuclei. |
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| Language | English |
| Publishing date | 2022-11-01 |
| 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.129.182501 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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