arXiv: Nuclear Experiment最新文献

{"title":"Positron beams and two-photon exchange: The key to precision form factors","authors":"J. Bernauer","doi":"10.1063/1.5040203","DOIUrl":"https://doi.org/10.1063/1.5040203","url":null,"abstract":"The proton elastic form factor ratio can be measured either via Rosenbluth separation in an unpolarized beam and target experiment, or via the use of polarization degrees of freedom. However, data produced by these two approaches show a discrepancy, increasing with $Q^2$. The proposed explanation of this discrepancy---two-photon exchange---has been tested recently by three experiments. The results support the existence of a small two-photon exchange effect but cannot establish that theoretical treatment at the measured momentum transfers are valid. At larger momentum transfers, theory remains untested. This paper investigates the possibilities of measurements at DESY and Jefferson Lab to measure the effect at larger momentum transfers.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80600626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gamma-widths, lifetimes and fluctuations in the nuclear quasi-continuum","authors":"M. Guttormsen, A. Larsen, J. E. Midtbø, L. C. Campo, A. Görgen, V. W. Ingeberg, T. Renstrøm, S. Siem, G. Tveten, F. Zeiser, L. Kirsch","doi":"10.1051/epjconf/201817806001","DOIUrl":"https://doi.org/10.1051/epjconf/201817806001","url":null,"abstract":"Statistical $gamma$-decay from highly excited states is determined by the nuclear level density (NLD) and the $gamma$-ray strength function ($gamma$SF). These average quantities have been measured for several nuclei using the Oslo method. For the first time, we exploit the NLD and $gamma$SF to evaluate the $gamma$-width in the energy region below the neutron binding energy, often called the quasi-continuum region. The lifetimes of states in the quasi-continuum are important benchmarks for a theoretical description of nuclear structure and dynamics at high temperature. The lifetimes may also have impact on reaction rates for the rapid neutron-capture process, now demonstrated to take place in neutron star mergers.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86792373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Majorana Demonstrator Status and Preliminary Results","authors":"C. -. Yu, S. Alvis, I. Arnquist, F. Avignone, A. Barabash, C. Barton, F. Bertrand, T. Bode, V. Brudanin, M. Busch, M. Buuck, T. Caldwell, Y. Chan, C. Christofferson, P. Chu, C. Cuesta, J. Detwiler, C. Dunagan, Y. Efremenko, H. Ejiri, S. Elliott, T. Gilliss, G. Giovanetti, M. Green, J. Gruszko, I. Guinn, V. Guiseppe, C. Haufe, L. Hehn, R. Henning, E. Hoppe, M. Howe, K. Keeter, M. Kidd, S. Konovalov, R. Kouzes, A. M. Lopez, R. Martin, R. Massarczyk, S. Meijer, S. Mertens, J. Myslik, G. Othman, W. Pettus, A. Poon, D. Radford, J. Rager, A. Reine, K. Rielage, N. Ruff, B. Shanks, M. Shirchenko, A. Suriano, D. Tedeschi, R. Varner, S. Vasilyev, K. Vetter, K. Vorren, B. White, J. Wilkerson, C. Wiseman, W. Xu, E. Yakushev, V. Yumatov, I. Zhitnikov, B. M. L. A. N. Laboratory, Oak Ridge, Tn, Usa, Center for High Energy Physics, Astrophysics, D. Physics, U. Washington, Wa, P. N. N. Laboratory, Richland, Astronomy, U. O. N. Carolina, Columbia, Sc, N. Center, K. Institute, Institute for Theoretical, E. Physics, Moscow, ","doi":"10.1051/epjconf/201817801006","DOIUrl":"https://doi.org/10.1051/epjconf/201817801006","url":null,"abstract":"The Majorana Collaboration is using an array of high-purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. Searches for neutrinoless double-beta decay are understood to be the only viable experimental method for testing the Majorana nature of the neutrino. Observation of this decay would imply violation of lepton number, that neutrinos are Majorana in nature, and provide information on the neutrino mass. The Majorana Demonstrator comprises 44.1 kg of p-type point-contact Ge detectors (29.7 kg enriched in 76Ge) surrounded by a low-background shield system. The experiment achieved a high efficiency of converting raw Ge material to detectors and an unprecedented detector energy resolution of 2.5 keV FWHM at Q$_{betabeta}$. The Majorana collaboration began taking physics data in 2016. This paper summarizes key construction aspects of the Demonstrator and shows preliminary results from initial data.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79743591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Main features of detectors and isotopes to investigate double beta decay with increased sensitivity","authors":"A. Barabash","doi":"10.1142/S0217751X18430017","DOIUrl":"https://doi.org/10.1142/S0217751X18430017","url":null,"abstract":"The current situation in double beta decay experiments , the characteristics of modern detectors and the possibility of increasing the sensitivity to neutrino mass in future experiments are discussed. The issue of the production and use of enriched isotopes in double beta decay experiments is discussed in addition.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86936276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Positrons at JLab advancing nuclear science in Hall B","authors":"V. Burkert","doi":"10.1063/1.5040195","DOIUrl":"https://doi.org/10.1063/1.5040195","url":null,"abstract":"In this talk I address two high impact physics programs that require the use of polarized and unpolarized positron beams in addition to using electron beams of the same energy. First, I address what will be gained from using positron beams in addition to electron beams in the extraction of the Compton Form Factors (CFFs) and generalized parton distributions (GPDs) from Deeply Virtual Compton Scattering (DVCS) on a proton target. As a second high impact science program I discuss an experimental scenario using unpolarized positrons to measure elastic scattering on protons in an effort to determine definitively the 2-photon exchange contributions in order to resolve a longstanding discrepancy in the determination of the proton’s electric and magnetic form factors.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86378938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The kaonic atoms research program at DAΦNE: from SIDDHARTA to SIDDHARTA-2","authors":"A. Scordo, A. Amirkhani, M. Bazzi, G. Bellotti, C. Berucci, D. Bosnar, A. Bragadireanu, M. Cargnelli, C. Curceanu, A. Butt, R. D. Grande, L. Fabbietti, C. Fiorini, F. Ghio, C. Guaraldo, R. Hayano, M. Iliescu, M. Iwasaki, P. Sandri, J. Marton, M. Miliucci, P. Moskal, D. Pietreanu, K. Piscicchia, H. Shi, M. Silarski, D. Sirghi, F. Sirghi, M. Skurzok, A. Spallone, H. Tatsuno, O. Doce, E. Widmann, J. Zmeskal","doi":"10.1051/epjconf/201818101004","DOIUrl":"https://doi.org/10.1051/epjconf/201818101004","url":null,"abstract":"The interaction of antikaons with nucleons and nuclei in the low-energy regime represents an active research field in hadron physics with still many important open questions. The investigation of light kaonic atoms, in which one electron is replaced by a negatively charged kaon, is a unique tool to provide precise information on this interaction; the energy shift and the broadening of the low-lying states of such atoms, induced by the kaon-nucleus hadronic interaction, can be determined with high precision from the atomic X-ray spectroscopy, and this experimental method provides unique information to understand the low energy kaon-nucleus interaction at the production threshold. The lightest atomic systems, like the kaonic hydrogen and the kaonic deuterium deliver, in a model-independent way, the isospin-dependent kaon-nucleon scattering lengths. The most precise kaonic hydrogen measurement to-date, together with an exploratory measurement of kaonic deuterium, were carried out in 2009 by the SIDDHARTA collaboration at the DAΦNE electron-positron collider of LNF-INFN, combining the excellent quality kaon beam delivered by the collider with new experimental techniques, as fast and very precise X-ray detectors, like the Silicon Drift Detectors. The SIDDHARTA results triggered new theoretical work, which achieved major progress in the understanding of the low-energy strong interaction with strangeness reflected by the antikaon-nucleon scattering lengths calculated with the antikaon-proton amplitudes constrained by the SIDDHARTA data. The most important open question is the experimental determination of the hadronic energy shift and width of kaonic deuterium; presently, a major upgrade of the setup, SIDDHARTA-2, is being realized to reach this goal. In this paper, the results obtained in 2009 and the proposed SIDDHARTA-2 upgrades are presented.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85292940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Beam energy and system dependence of rapidity-even dipolar flow","authors":"N. Magdy","doi":"10.1051/epjconf/201817116002","DOIUrl":"https://doi.org/10.1051/epjconf/201817116002","url":null,"abstract":"New measurements of rapidity-even dipolar flow, v$^{even}_{1}$, are presented for several transverse momenta, $p_T$, and centrality intervals in Au+Au collisions at $sqrt{s_{NN}}~=~200,~39$ and $19.6$ GeV, U+U collisions at $sqrt{s_{NN}}~=~193$ GeV, and Cu+Au, Cu+Cu, d+Au and p+Au collisions at $sqrt{s_{NN}}~=~200$~GeV. The v$^{even}_{1}$ shows characteristic dependencies on $p_{T}$, centrality, collision system and $sqrt{s_{_{NN}}}$, consistent with the expectation from a hydrodynamic-like expansion to the dipolar fluctuation in the initial state. These measurements could serve as constraints to distinguish between different initial-state models, and aid a more reliable extraction of the specific viscosity $eta/s$.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75014548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of Multi-neutron Systems with SAMURAI Spectrometer","authors":"Z. Yang, F. Marqu'es, N. Achouri, D. Ahn, T. Aumann, H. Baba, D. Beaumel, M. Bohmer, K. Boretzky, M. Caamano, S. Chen, N. Chiga, M.L.Cort'es, D. Cortina, P. Doornenbal, C. Douma, F. Dufter, J. Feng, B.Fern'andez-Dom'inguez, Z. Elekes, U. Forsberg, T. Fujino, N. Fukuda, I.Gavspari'c, Z. Ge, R. Gernhauser, J. Gheller, J. Gibelin, A. Gillibert, B.M.Godoy, Z. Hal'asz, T. Harada, M. Harakeh, A. Hirayama, S.W.Huang, N. Inabe, T. Isobe, J. Kahlbow, N. Kalantar-Nayestanaki, D.Kim, S. Kim, M. Knosel, T. Kobayashi, Y. Kondo, P. Koseoglou, Y.Kubota, I. Kuti, C. Lehr, P. Li, Y. Liu, Y. Maeda, S. Masuoka, M.Matsumoto, J. Mayer, H. Miki, M. Miwa, I. Murray, T. Nakamura, A.Obertelli, N. Orr, H. Otsu, V. Panin, S. Park, M. Pârlog, S. Paschalis, M.Potlog, S. Reichert, A. Revel, D. Rossi, A. Saito, M. Sasano, H. Sato, H.Scheit, F. Schindler, T. Shimada, Y. Shimizu, S. Shimoura, I. Stefan, S.Storck, L. Stuhl, H. Suzuki, D. Symochko, H. Takeda, S. Takeuchi, J.Tanaka, Y. Togano, T. Tomai, H. T. T. J. Tscheuschner, T.Uesaka, V","doi":"10.1007/978-3-030-32357-8_87","DOIUrl":"https://doi.org/10.1007/978-3-030-32357-8_87","url":null,"abstract":"","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75642246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Hoyle State in Relativistic $$^{12}$$C Dissociation","authors":"D. Artemenkov, M. Haiduc, N. K. Kornegrutsa, E. Mitsova, N. Peresadko, V. Rusakova, R. Stanoeva, A. Zaitsev, P. Zarubin, I. Zarubina","doi":"10.1007/978-3-030-32357-8_24","DOIUrl":"https://doi.org/10.1007/978-3-030-32357-8_24","url":null,"abstract":"","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76106502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electronic catalogue of muonic X-rays","authors":"D. Zinatulina, C. Briančon, V. Brudanin, V. Egorov, L. Perevoshchikov, M. Shirchenko, I. Yutlandov, C. Petitjean","doi":"10.1051/EPJCONF/201817703006","DOIUrl":"https://doi.org/10.1051/EPJCONF/201817703006","url":null,"abstract":"{$mu$}X-ray spectra for Z=9-90 were measured with HPGe detectors and muonic beams of PSI (Villigen, Switzerland). The results are presented as electronic atlas composed of graphic plots. The atlas is available at JINR site.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83804453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}