Measurements of g(4+/1 , 2+/2) in 70,72,74,76Ge: Systematics of low-lying structures in 30 < Z < 40 and 30 < N < 50 nuclei
Date
2013
Authors
Gurdal, G.
Stefanova, E.
Boutachkov, P.
Torres, D.A.
Kumbartzki, G
Benczer-Koller, N
Sharon, Y.Y.
Zamick, L.
Robinson, S.J.Q.
Ahn, T.
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American Physical Society
Abstract
Background: The interplay between single-particle and collective excitations in the 30 ?Z? 40 and 30 ?N? 50 even-even isotopes has been examined in light of recent new measurements of magnetic moments of 41+, 22+, and 21+ states. Purpose: The g factors of the 41+ and 22+ states in the 72,74,76Ge isotopes have been measured for the first time and the g(21+) values have been remeasured. Methods: The transient field (TF) technique in inverse kinematics with a variety of targets has been applied, following Coulomb excitation of the relevant states. The data have been analyzed within the framework of the IBA-II model. Large-scale shell-model calculations have been performed within the p3/2,p1/2,f 5/2,g9/2 orbital space for both protons and neutrons with the JUN45 and JJ4B interactions. Results: The measured Ge g factors were compared to the g factors of the low-lying states of the neighboring Zn, Ge, Se, Kr, and Sr isotopes. The results were evaluated in the context of the systematics of g factors in the A?80 region. Conclusions: The predictions based on the classic collective model and the interacting boson model IBA-II agree with the experimental results. No evidence for shell closure was found for neutrons at N=38 or N=40. � 2013 American Physical Society.
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Physical Review C: Nuclear Physics
Type
Journal article
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Open Access