Orbital Dependent Nucleonic Pairing in the Lightest Known Isotopes of Tin

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.105.162502· OSTI ID:993026

Darby, Iain ^[1]; Grzywacz, R. ^[1]; Batchelder, J. C. ^[2]; Bingham, C. R. ^[1]; Cartegni, L. ^[1]; Gross, Carl J ^[3]; Liddick, Sean ^[1]; Nazarewicz, Witold ^[3]; Padgett, Stephen ^[1]; Papenbrock, T. ^[4]; Rajabali, M. M. ^[1]; Rotureau, J. ^[4]; Rykaczewski, Krzysztof Piotr ^[3]

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1. University of Tennessee, Knoxville (UTK)
2. Oak Ridge Associated Universities (ORAU)
3. ORNL
4. University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)

By studying the {sup 109}Xe {yields} {sup 105}Te {yields} {sup 101}Sn superallowed {alpha}-decay chain, we observe low-lying states in {sup 101}Sn, the one-neutron system outside doubly magic {sup 100}Sn. We find that the spins of the ground state (J=7/2) and first excited state (J=5/2) in {sup 101}Sn are reversed with respect to the traditional level ordering postulated for {sup 103}Sn 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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Holifield Radioactive Ion Beam Facility (HRIBF)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 993026
• Journal Information: Physical Review Letters, Vol. 105, Issue 16; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
EXCITED STATES
GROUND STATES
TIN ISOTOPES
SPIN