1. Hindered proton collectivity in the proton-rich nucleus ^<28>S : Possible magic number Z = 16
- Author
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Togano, Y., Yamada, Y., Iwasa, N., Yamada, K., Motobayashi, T., Aoi, N., Baba, H., Bishop, S., Cai, X., Doornenbal, P., Fang, D., Furukawa, T., Ieki, K., Kawabata, T., Kanno, S., Kobayashi, N., Kondo, Y., Kuboki, T., Kume, N., Kurita, K., Kurokawa, M., Ma, Y.G., Matsuo, Y., Murakami, H., Matsushita, M., Nakamura, T., Okada, K., Ota, S., Satou, Y., Shimoura, S., Shioda, R., Tanaka, K.N., Takeuchi, S., Tian, W., Wang, H., Wang, J., and Yoneda, K.
- Subjects
Reaction induced by unstable nuclei ,Coulomb excitation ,Multipole matrix elements - Abstract
NUCLEAR STRUCTURE AND DYNAMICS 2012, 9–13 July 2012, The reduced transition probability B(E2;O^_ → 2^_) for the proton-rich nucleus ^S was determined experimentally using intermediate-energy Coulomb excitation. The resultant B(E2) value 181(31) e^2fm^4 is smaller than those of neighboring N = 12 isotones and Z = 16 isotopes. The double ratio |M_n|M_p|/(N/Z) of the 0^_ → 2^_ transition in ^S was obtained to be 1.9(2) by evaluating the M_n value from the known B(E2) value of the mirror nucleus ^Mg, showing the hindrance of proton collectivity relative to that of neutrons. These results indicate the emergence of the magic number Z = 16 in ^S.
- Published
- 2012