CNO and pep neutrino spectroscopy in Borexino:: Measurement of the deep-underground production of cosmogenic 11C in an organic liquid scintillator

被引:36
作者
Back, H.
Balata, M.
Bellini, G.
Benziger, J.
Bonetti, S.
Caccianiga, B.
Calaprice, F.
D'Angelo, D.
de Bellefon, A.
de Kerret, H.
Derbin, A.
Etenko, A.
Ford, R.
Franco, D.
Galbiati, C.
Gazzana, S.
Giammarchi, M.
Goretti, A.
Grieb, C.
Harding, E.
Heusser, G.
Ianni, A.
Ianni, A. M.
Kobychev, V. V.
Korga, G.
Kozlov, Y.
Kryn, D.
Laubenstein, M.
Lendvai, C.
Leung, M.
Litvinovich, E.
Lombardi, P.
Machulin, I.
Maneira, J.
Manuzio, D.
Manuzio, G.
Masetti, F.
Mazzucato, U.
McCarty, K.
Meroni, E.
Miramonti, L.
Monzani, M. E.
Muratova, V.
Niedermeier, L.
Oberauer, L.
Obolensky, M.
Ortica, F.
Pallavicini, M.
Papp, L.
Perasso, L.
机构
[1] Virginia Polytech Inst & State Univ, Dept Phys, Blacksburg, VA 24061 USA
[2] Ist Nazl Fis Nucl, Lab Nazl Gran Sasso, I-67010 Assergi, AQ, Italy
[3] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy
[4] Ist Nazl Fis Nucl, I-20133 Milan, Italy
[5] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA
[6] Tech Univ Munich, D-85747 Garching, Germany
[7] Coll France, APC, F-75231 Paris 05, France
[8] Joint Inst Nucl Res, Dubna 141980, Russia
[9] RRC Kurchatov Inst, RU-123182 Moscow, Russia
[10] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany
[11] Kiev Inst Nucl Res, UA-06380 Kiev, Ukraine
[12] Queens Univ, Dept Phys, Kingston, ON K7L 3N6, Canada
[13] Univ Genoa, Dept Fis, I-16146 Genoa, Italy
[14] Ist Nazl Fis Nucl, I-16146 Genoa, Italy
[15] Univ Perugia, Dipartimento Chim, I-06123 Perugia, Italy
[16] Case Western Reserve Univ, Cleveland, OH 44118 USA
[17] Jagiellonian Univ, M Smoluchowski Inst Phys, PL-300059 Krakow, Poland
来源
PHYSICAL REVIEW C | 2006年 / 74卷 / 04期
关键词
D O I
10.1103/PhysRevC.74.045805
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
Borexino is an experiment for low-energy neutrino spectroscopy at the Gran Sasso underground laboratories. It is designed to measure the monoenergetic Be-7 solar neutrino flux in real time, via neutrino-electron elastic scattering in an ultrapure organic liquid scintillator. Borexino has the potential to also detect neutrinos from the pep fusion process and the CNO cycle. For this measurement to be possible, radioactive contamination in the detector must be kept extremely low. Once sufficiently clean conditions are met, the main background source is C-11, produced in reactions induced by the residual cosmic muon flux on C-12. In the process, a free neutron is almost always produced. C-11 can be tagged on an event-by-event basis by looking at the threefold coincidence with the parent muon track and the subsequent neutron capture on protons. This coincidence method has been implemented on the Borexino Counting Test Facility data. We report on the first event-by-event identification of in situ muon-induced C-11 in a large underground scintillator detector. We measure a C-11 production rate of 0.130 +/- 0.026(stat) +/- 0.014(syst) day(-1) ton(-1), in agreement with predictions from both experimental studies performed with a muon beam on a scintillator target and ab initio estimations based on the C-11 producing nuclear reactions.
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