Measurements of g(41+,22+) in 70,72,74 ,76Ge: Systematics of low-lying structures in 30≤Z≤40 and 30≤N≤50 nuclei

G. Gürdal, E. A. Stefanova, P. Boutachkov, D. A. Torres, G. J. Kumbartzki, N. Benczer-Koller, Y. Y. Sharon, L. Zamick, S. J.Q. Robinson, T. Ahn, V. Anagnostatou, C. Bernards, M. Elvers, A. Heinz, G. Ilie, D. Radeck, D. Savran, V. Werner, E. Williams

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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.

Original languageEnglish
Article number014301
JournalPhysical Review C - Nuclear Physics
Volume88
Issue number1
DOIs
Publication statusPublished - 3 Jul 2013
Externally publishedYes

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