Spectroscopy of positive parity states in Mg26 and Al26 via the (3He) and (,t) reactions

M. Yasue, K. Ogawa, T. Niizeki, J. Takamatsu, M. Ohura, A. Terakawa, T. Nakagawa, T. Hasegawa, H. Ohnuma, H. Toyokawa, S. Hamada

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The (,3He) and (,t) reactions on Mg25 were measured at E=50 MeV. Cross sections obtained for 57 positive parity states in Mg26 and Al26 were analyzed within the framework of the exact-finite-range distorted-wave Born approximation and compared to the full s-d shell model predictions. Reasonable agreement between the experimental strengths and the theory was obtained for the low lying states. Deviations of factors of 2 or more were found for some high lying 2+, 3+, and 4+ states in Al26 and especially for the 11+ state in Mg26. The spectroscopic factors for the transitions to the analog states in Mg26 and Al26 were compared between these reactions. The same strength was obtained for the 61-, T=1 state in Mg26 and Al26, whereas an enhancement of about 30% was observed for the 01+ and 31+, T=1 states in Al26. Further, 1+ states in Mg26 proposed around Ex=10 MeV through the (p,p) reaction were also observed in the Mg25(,3He) reaction without the special enhancement for the 10.6 MeV 1+ state seen in the (p,p) reaction. The total observed strengths for neutron stripping to the positive-parity states in the region of Ex=011 MeV almost attained the limit of the pure j-j coupling scheme. Those for the proton stripping were 70% of the limit in the region of Ex=08 MeV.

Original languageEnglish
Pages (from-to)1279-1296
Number of pages18
JournalPhysical Review C - Nuclear Physics
Issue number4
Publication statusPublished - 1990


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