Mirror-symmetry structure of A=27, T=1/2 nuclei studied through strong, weak, and electromagnetic interactions
Jan, 1999
10 pages
Published in:
- Phys.Rev.C 59 (1999) 90-100
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Abstract: (APS)
Gamow-Teller (GT) transitions and M1 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 27Al and 27Si, experimental data on GT transition strengths obtained from 27Si→27Al β decay and from a good-resolution 27Al(3He,t)27Si reaction at 150 MeV/nucleon and 0° have been compared with M1 transition strengths obtained from γ decay in 27Al and 27Al(γ,γ′) 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(M1) 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.- 27.30.+t
- 25.55.Kr
- 23.20.Lv
- 21.10.Hw
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