High-resolution study of the 9Be(3He,t) 9B reaction up to the 9B triton threshold

被引：31

作者：

Scholl, C. ^{[1
]}

Fujita, Y. ^{[2
]}

Adachi, T. ^{[2
,3
]}

von Brentano, P. ^{[1
]}

Fujita, H. ^{[2
]}

Gorska, M. ^{[4
]}

Hashimoto, H. ^{[5
]}

Hatanaka, K. ^{[5
]}

Matsubara, H. ^{[5
,6
]}

Nakanishi, K. ^{[6
]}

Ohta, T. ^{[5
]}

Sakemi, Y. ^{[5
,7
]}

Shimbara, Y. ^{[8
,9
]}

Shimizu, Y. ^{[5
]}

Tameshige, Y. ^{[5
]}

Tamii, A. ^{[5
]}

Yosoi, M. ^{[5
,10
]}

Zegers, R. G. T. ^{[8
,11
]}

机构：

[1] Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany

[2] Osaka Univ, Dept Phys, Osaka 5600043, Japan

[3] Univ Groningen, Kernfys Versneller Inst, NL-9747 AA Groningen, Netherlands

[4] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

[5] Osaka Univ, Res Ctr Nucl Phys, Osaka 5670047, Japan

[6] Univ Tokyo, Ctr Nucl Study, Tokyo 3510198, Japan

[7] Tohoku Univ, CYRIC, Sendai, Miyagi 980, Japan

[8] Michigan State Univ, NSCL, E Lansing, MI 48824 USA

[9] RIKEN Nishina Ctr, Tokyo 3510198, Japan

[10] Kyoto Univ, Dept Phys, Sakyo Ku, Kyoto 6068502, Japan

[11] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

来源：

PHYSICAL REVIEW C | 2011年 / 84卷 / 01期

关键词：

BETA-DECAY; SYMMETRY-STRUCTURE; BEAM LINE; SCATTERING; STATES; SPECTROMETER; SPIN; BE-9;

D O I：

10.1103/PhysRevC.84.014308

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：

A high-energy-resolution Be-9(He-3,t)B-9 charge-exchange reaction was performed around a scattering angle of 0 degrees. and at an intermediate incident energy of 140 MeV/ nucleon for the study of precise Gamow-Teller (GT) transition strengths. The energy resolution of 30 keV allowed a precise deconvolution of the spectrum and the determination of angular distributions of cross sections, excitation energies, and decay widths. The GT strength of 10 states has been determined for the first time using the GT strength of the analogous beta decays of Li-9 and C-9 as standards. The large difference between the GT strengths going to the low-lying T = 1/ 2 and the highly excited T = 3/ 2 states is interpreted as a result of their different spatial structures. The obtained GT strength distribution is compared to the results of a (p, n) experiment with lower resolution performed in the 1980s. In particular, the width of the 16.8 MeV, J(pi) = (5/2(+)) state has been determined for the first time.

引用

页数：12

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