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Orbital Dependent Nucleonic Pairing in the Lightest Known Isotopes of Tin

I. G. DarbyDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAR. GrzywaczDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAJ. C. BatchelderUNIRIB, Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, USAC. R. BinghamDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAL. CartegniDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAC. J. GrossPhysics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAM. Hjorth‐JensenDepartment of Physics and Center of Mathematics for Applications, University of Oslo, N-0316 Oslo, NorwayD. T. JossOliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United KingdomS. N. LiddickDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAW. NazarewiczDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAS. PadgettDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAR. D. PageOliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United KingdomT. PapenbrockDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAM. M. RajabaliDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAJ. RotureauDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAK. P. RykaczewskiPhysics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

2010en

ABI

Annotatsiya

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

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Identifikatorlar

DOI: 10.1103/physrevlett.105.162502

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