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DOI : 10.1103/PhysRevLett.103.152503

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Physical Review Letters 103 (2009) 152503

Breakdown of the Z = 8 Shell Closure in Unbound $^{12}$O and its Mirror Symmetry

D. Suzuki1, 2, H. Iwasaki1, 2, D. Beaumel2, L. Nalpas3, E. Pollacco3, M. Assié2, H. Baba4, Y. Blumenfeld2, N. De Séréville2, A. Drouart3, S. Franchoo2, A. Gillibert3, J. Guillot2, F. Hammache2, N. Keeley5, V. Lapoux3, F. Maréchal2, S. Michimasa6, X. Mougeot3, I. Mukha7, H. Okamura8, H. Otsu4, A. Ramus2, P. Roussel-Chomaz9, H. Sakurai1, 4, J.-A. Scarpaci2, O. Sorlin9, I. Stefan2, M. Takechi4

(2009)

An excited state in the proton-rich unbound nucleus 12O was identified at 1.8(4) MeV via missing-mass spectroscopy with the 14Oðp; tÞ reaction at 51 AMeV. The spin-parity of the state was determined to be 0þ or 2þ by comparing the measured differential cross sections with distorted-wave calculations. The lowered location of the excited state in 12O indicates the breakdown of the major shell closure at Z ¼ 8 near the proton drip line. This demonstrates the persistence of mirror symmetry in the disappearance of the magic number 8 between 12O and its mirror partner 12Be.

1 :	Department of Physics, University of Tokyo
2 :	IPNO - Institut de Physique Nucléaire d'Orsay
3 :	IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
4 :	RIKEN Nishina Center
5 :	Department of Nuclear Reactions
6 :	CNS
7 :	Universidad de Sevilla
8 :	RCNP - Research Center for Nuclear Physics
9 :	GANIL - Grand Accélérateur National d'Ions Lourds

Thème(s)

:

Physique/Physique Nucléaire Expérimentale

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