Orbital dependent nucleonic pairing in the lightest known isotopes of tin

Details Orbital dependent nucleonic pairing in the lightest known isotopes of tin Orbital dependent nucleonic pairing in the lightest known isotopes of tin

2010-09-11

arxiv.org/abs/1009.2162v1

Phys.Rev.Lett.105:162502,2010

Physics

Nuclear Physics

Nuclear Experiment

5 pages 3 figures

Scientific paper

10.1103/PhysRevLett.105.162502

By studying the 109Xe-->105Te-->101Sn superallowed alpha-decay chain, we observe low-lying states in 101Sn, the one-neutron system outside doubly magic 100Sn. We find that the spins of the ground state (J = 7=2) and first excited state (J = 5=2) in 101Sn are reversed with respect to the traditional level ordering postulated for 103Sn and the heavier tin isotopes. Through simple arguments and state-of-the-art shell model calculations we explain this unexpected switch in terms of a transition from the single-particle regime to the collective mode in which orbital-dependent pairing correlations, dominate.

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