Hindered proton collectivity in 28S: Possible magic number at Z=16

Details Hindered proton collectivity in 28S: Possible magic number at Z=16 Hindered proton collectivity in 28S: Possible magic number at Z=16

2012-04-04

arxiv.org/abs/1204.0920v1

Physics

Nuclear Physics

Nuclear Experiment

10 pages, 3 figures. Accepted for Publication in Phys. Rev. Lett

Scientific paper

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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