Empirical pairing gaps, shell effects, and di-neutron spatial correlation in neutron-rich nuclei
2015 (English)In: Nuclear Physics A, ISSN 0375-9474, Vol. 940, 210-226 p.Article in journal (Refereed) Published
The empirical pairing gaps derived from four different odd-even mass staggering formulas are compared. By performing single-j shell and multi-shell seniority model calculations as well as by using the standard HFB approach with Skyrme force we show that the simplest three-point formula δC(3)(N)=12[B(N,Z)+B(N-2,Z)-2B(N-1,Z)] can provide a good measure of the neutron pairing gap in even-N nuclei. It removes to a large extent the contribution from the nuclear mean field as well as contributions from shell structure details. It is also less contaminated by the Wigner effect for nuclei around N=Z. We also show that the strength of δC(3)(N) can serve as a good indication of the two-particle spatial correlation in the nucleus of concern and that the weakening of δC(3)(N) in some neutron-rich nuclei indicates that the di-neutron correlation itself is weak in these nuclei.
Place, publisher, year, edition, pages
2015. Vol. 940, 210-226 p.
Di-neutron correlation, Empirical pairing gap, Odd-even staggering, Pairing correlation
IdentifiersURN: urn:nbn:se:kth:diva-170315DOI: 10.1016/j.nuclphysa.2015.04.010ISI: 000356127500012ScopusID: 2-s2.0-84930001942OAI: oai:DiVA.org:kth-170315DiVA: diva2:827976
FunderSwedish Research Council, 621-2012-3805, 621-2013-4323
QC 201506292015-06-292015-06-292015-07-06Bibliographically approved