The (d,2He) reaction on 76Se and the double-β-decay matrix elements for A=76

被引：81
作者：
Grewe, E. -W. [1 ]
Baeumer, C. [1 ]
Dohmann, H. [1 ]
Frekers, D. [1 ]
Harakeh, M. N. [2 ]
Hollstein, S. [1 ]
Johansson, H. [3 ]
Popescu, L. [4 ]
Rakers, S. [1 ]
Savran, D. [2 ,5 ]
Simon, H. [3 ]
Thies, J. H. [1 ]
van den Berg, A. M. [2 ]
Woertche, H. J. [2 ]
Zilges, A. [6 ]
机构：
[1] Univ Munster, Inst Kernphys, D-48149 Munster, Germany
[2] Univ Groningen, Kernfys Versneller Inst, NL-9747 AA Groningen, Netherlands
[3] Gesell Schwerionenforsch mbH, D-63291 Darmstadt, Germany
[4] Univ Ghent, Vakgrp Subatomaire & Stralingsfys, B-9000 Ghent, Belgium
[5] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany
[6] Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany
来源：
PHYSICAL REVIEW C | 2008年 / 78卷 / 04期
关键词：
D O I：
10.1103/PhysRevC.78.044301
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：
The (d,He-2) charge-exchange reaction on Se-76 was studied at an incident energy of 183 MeV. The outgoing two protons in the S-1(0) state, referred to as He-2, were both momentum analyzed and detected by the same spectrometer and detector. The experiment was performed at KVI, Groningen, using the magnetic spectrometer BBS at three angular positions: 0(degrees),2.5(degrees), and 5(degrees). Excitation-energy spectra of the residual nucleus As-76 were obtained with an energy resolution of about 120 keV (FWHM). Gamow-Teller (GT(+)) transition strengths were extracted up to 5 MeV and compared with those from an (n,p) experiment at low resolution. Together with the GT(-) transition strengths from the Ge-76(p,n) experiment leading to the same intermediate nucleus, the nuclear matrix element of the two-neutrino double-beta decay of Ge-76 was evaluated.
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