High energy-resolution measurement of the Se 82 (He 3,t) Br 82 reaction for double- β decay and for solar neutrinos

D. Frekers, M. Alanssari, T. Adachi, B. T. Cleveland, M. Dozono, H. Ejiri, S. R. Elliott, H. Fujita, Y. Fujita, M. Fujiwara, K. Hatanaka, M. Holl, D. Ishikawa, H. Matsubara, H. Okamura, P. Puppe, K. Suda, A. Tamii, J. Thies, H. P. Yoshida

研究成果: Article査読

21 被引用数 (Scopus)

抄録

A high-resolution (He3,t) charge-exchange experiment at an incident energy of 420 MeV has been performed on the double beta (ββ) decay nucleus Se82. A detailed Gamow-Teller (GT-) strength distribution in Br82 has been extracted, which provides information to the ββ-decay nuclear matrix elements. Three strong and isolated transitions, which are to the 75, 1484 and the 2087 keV states in Br82, are found to dominate the low-excitation region below ≈2.1 MeV. Above 2.1 MeV a sudden onset of a strong GT fragmentation is observed. The degree of fragmentation resembles a situation found in the neighboring A=76 system Ge76, whereas the observed concentration of strength in the three low-lying states is reminiscent of the heavier neighbors Zr96 and Mo100. The strong GT transition to the 75 keV (1+) state makes Se82 interesting for solar neutrino detection. The Se82(νe,e-)Br82 solar neutrino capture rate in a nonoscillation scenario is therefore evaluated to 668±12(stat)±60(sys) SNU, and some of the advantages of using selenium for solar neutrino studies are discussed.

本文言語English
論文番号014614
ジャーナルPhysical Review C
94
1
DOI
出版ステータスPublished - 21-07-2016
外部発表はい

All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学

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