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

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arxiv 1204.0920 v2 pith:DAQNT2LR submitted 2012-04-04 nucl-ex

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
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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 M. Matsushita T. Nakamura K. Okada S. Ota Y. Satou S. Shimoura R. Shioda K. N. Tanaka S. Takeuchi W. Tian H. Wang J. Wang K. Yoneda
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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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