Hindered proton collectivity in 28S: Possible magic number at Z=16
Y. Togano, Y. Yamada, N. Iwasa, K. Yamada, T. Motobayashi, N. Aoi, H., Baba, S. Bishop, X. Cai, P. Doornenbal, D. Fang, T. Furukawa, K. Ieki, T., Kawabata, S. Kanno, N. Kobayashi, Y. Kondo, T. Kuboki, N. Kume, K. Kurita, M., Kurokawa, Y. G. Ma, Y. Matsuo, H. Murakami
TL;DR
This study investigates the reduced proton collectivity in 28S through Coulomb excitation, revealing a smaller B(E2) value and suggesting Z=16 as a new magic number due to hindered proton collectivity.
Contribution
It provides experimental evidence for hindered proton collectivity in 28S and proposes Z=16 as a possible new magic number in this nucleus.
Findings
B(E2) value of 181(31) e2fm4 for 28S
Double ratio |M_n/M_p|/(N/Z) = 1.9(2) indicating hindered proton collectivity
Evidence supporting Z=16 as a magic number in 28S
Abstract
The reduced transition probability B(E2;0 ->2+) for 28S was obtained experimentally using Coulomb excitation at 53 MeV/nucleon. The resultant B(E2) value 181(31) e2fm4 is smaller than the expectation based on empirical B(E2) systematics. The double ratio |M_n/M_p|/(N/Z) of the 0+ ->2+ transition in 28S was determined to be 1.9(2) by evaluating the M_n value from the known B(E2) value of the mirror nucleus 28Mg, showing the hindrance of proton collectivity relative to that of neutrons. These results indicate the emergence of the magic number Z=16 in the |T_z|=2 nucleus 28S.
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