Mirror-symmetry structure of A=27, T=1/2 nuclei studied through strong, weak, and electromagnetic interactions

被引:67
作者
Fujita, Y [1 ]
Akimune, H
Daito, I
Fujimura, H
Fujiwara, M
Harakeh, MN
Inomata, T
Jänecke, J
Katori, K
Tamii, A
Tanaka, M
Ueno, H
Yosoi, M
机构
[1] Osaka Univ, Dept Phys, Osaka 5600043, Japan
[2] Osaka Univ, Nucl Phys Res Ctr, Osaka 5670047, Japan
[3] Kernfys Versneller Inst, NL-9747 AA Groningen, Netherlands
[4] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA
[5] Kyoto Univ, Dept Phys, Kyoto 6068224, Japan
[6] Kobe Tokiwa Jr Coll, Kobe, Hyogo 6530824, Japan
来源
PHYSICAL REVIEW C | 1999年 / 59卷 / 01期
关键词
D O I
10.1103/PhysRevC.59.90
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
Gamow-Teller (GT) transitions and MI transitions from or to the ground states are analogous in the pair of T= 1/2 mirror nuclei, if the excited states hold the mirror-symmetry properties. In order to study the mirror-symmetry structure of the A = 27 mirror nuclei Al-27 and Si-27, experimental data on GT transition strengths obtained from Si-27-->Al-27 beta decay and from a good-resolution Al-27(He-3,t)Si-27 reaction at 150 MeV/nucleon and 0 degrees have been compared with M1 transition strengths obtained from gamma decay in Al-27 and Al-27(gamma,gamma') reaction. Good overall correspondence of transitions is observed for states up to nearly 9 MeV in excitation energy, where the particle-decay channel becomes Important. The difference of excitation energies of analog states in the mirror nuclei are about: 250 keV at this excitation energy. From a comparison of B(MI) and B(GT) strengths of the analogous transitions, the contribution of the isoscalar and the orbital terms in the M1 operator is found to become prominent in weak M1 transitions. [S0556-2813(99)03601-8].
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页码:90 / 100
页数:11
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