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arXiv · 1009.2162

Orbital dependent nucleonic pairing in the lightest known isotopes of tin

Iain G. Darby·Robert K. Grzywacz·Jon C. Batchelder·Carrol R. Bingham·Lucia Cartegni·Carl J. Gross·Morten Hjorth-Jensen·David T. Joss·Sean N. Liddick·Witold Nazarewicz·Stephen Padgett·Robert D. Page·Thomas Papenbrock·Mustafa M. Rajabali·Jimmy Rotureau·Krzysztof P. Rykaczewski
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Abstract

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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Iain G. Darby, Robert K. Grzywacz, Jon C. Batchelder, Carrol R. Bingham, Lucia Cartegni, Carl J. Gross, Morten Hjorth-Jensen, David T. Joss, Sean N. Liddick, Witold Nazarewicz, Stephen Padgett, Robert D. Page, Thomas Papenbrock, Mustafa M. Rajabali, Jimmy Rotureau, Krzysztof P. Rykaczewski. 2010-09-11. Orbital dependent nucleonic pairing in the lightest known isotopes of tin. https://doi.org/10.1103/physrevlett.105.162502

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