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25 April 2024

» pubmed » pmid17026356

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Reduction of the spin-orbit splittings at the n = 28 shell closure
L Gaudefroy ; O Sorlin ; D Beaumel ; Y Blumenfeld ; Z Dombrádi ; S Fortier ; S Franchoo ; M Gélin ; J Gibelin ; S Grévy ; F Hammache ; F Ibrahim ; K W Kemper ; K-L Kratz ; S M Lukyanov ; C Monrozeau ; L Nalpas ; F Nowacki ; A N Ostrowski ; T Otsuka ; Yu-E Penionzhkevich ; J Piekarewicz ; E C Pollacco ; P Roussel-Chomaz ; E Rich ; J A Scarpaci ; M G St Laurent ; D Sohler ; M Stanoiu ; T Suzuki ; E Tryggestad ; D Verney ;
Date:	1 Sep 2006
Journal:	Phys Rev Lett, 97 (9), 092501
Abstract:	The N = 28 shell closure has been investigated via the 46Ar(d,p)47Ar transfer reaction in inverse kinematics. Energies and spectroscopic factors of the neutron p(3/2), p(1/2), and f(5/2) states in 47Ar were determined and compared to those of the 49Ca isotone. We deduced a reduction of the N = 28 gap by 330(90) keV and spin-orbit weakenings of approximately 10(2) and 45(10)% for the f and p states, respectively. Such large variations for the f and p spin-orbit splittings could be accounted for by the proton-neutron tensor force and by the density dependence of the spin-orbit interaction, respectively. This contrasts with the picture of the spin-orbit interaction as a surface term only.
Source:	PubMed, pmid17026356
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