Large proton contribution to the 2+ excitation in 20Mg studied by intermediate energy inelastic scattering (vol 78, art no 024306, 2008)

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作者：
Iwasa, N.
Motobayashi, T.
Bishop, S.
Elekes, Z.
Gibelin, J.
Hosoi, M.
Ieki, K.
Ishikawa, K.
Iwasaki, H.
Kawai, S.
Kubono, S.
Kurita, K.
Kurokawa, M.
Matsui, N.
Minemura, T.
Morikawa, H.
Nakamura, T.
Niikura, M.
Notani, M.
Ota, S.
Saito, A.
Sakurai, H.
Shimoura, S.
Sugawara, K.
Sugimoto, T.
Suzuki, H.
Suzuki, T.
Tanihata, I.
Takeshita, E.
Teranishi, T.
Togano, Y.
Yamada, K.
Yamaguchi, K.
Yanagisawa, Y.
机构：
[1] Department of Physics, Tohoku University, Sendai
[2] RIKEN (Institute of Physical and Chemical Research), Wako
[3] Institute of Nuclear Research, Hungarian Academy of Sciences, H-4001 Debrecen
[4] Department of Physics, Rikkyo University, Toshima
[5] Institut de Physique Nucléaire, IN2P3-CNRS
[6] Department of Physics, Saitama University, Shimo-Ohkubo
[7] Department of Physics, Tokyo Institute of Technology, Ookayama, Meguro
[8] Department of Physics, University of Tokyo, Bunkyo
[9] Center for Nuclear Study (CNS), University of Tokyo, RIKEN Campus, Wako
[10] Physics Division, Argonne National Laboratory, Argonne
[11] Department of Physics, Kyoto University
[12] Research Center for Nuclear Physics, Osaka University, Ibaraki
[13] Department of Physics, Kyushu University, Hakozaki
来源：
PHYSICAL REVIEW C | 2008年 / 78卷 / 02期
关键词：
D O I：
10.1103/PhysRevC.78.029902
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Coulomb excitation of the proton-rich nucleus Mg20 was studied using a radioactive Mg20 beam at 58A MeV impinging on a lead target. The reduced transition probability B(E2;0g.s.+→21+) was extracted to be 177(32)e2 fm4, which agrees with the theoretical predictions by a cluster model assuming 16O+2p+2p structure, a mean-field approach based on the angular momentum projected generator coordinate method, and the USD shell model. The ratio of the neutron-to-proton multipole matrix elements Mn/Mp in the mirror nucleus O20 was deduced to be 2.51(25) with the Mn value evaluated from the measured B(E2) value for Mg20 with the help of isospin symmetry. The results confirm the large Mn/Mp value previously reported in O20, leading to the dominant role of the four valence nucleons in the 21+ excitation and persistence of the O16 core in O20 and Mg20. © 2008 The American Physical Society.
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