Spin-aligned neutron-proton pair mode in atomic nuclei
2011 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 84, no 2, 021301- p.Article in journal (Refereed) Published
Shell-model calculations using realistic interactions reveal that the ground and low-lying yrast states of the N = Z nucleus (92)(46)Pd are mainly built upon isoscalar neutron-proton pairs, each carrying the maximum angular momentum J = 9 allowed by the shell 0g(9/2), which is dominant in this nuclear region. This structure is different from that found in the ground and low-lying yrast states of all other even-even nuclei studied so far. The low-lying spectrum of excited states generated by such correlated neutron-proton pairs has two distinctive features: (i) the levels are almost equidistant at low energies and (ii) the transition probability I -> I - 2 is approximately constant and strongly selective. This unique mode is shown to replace normal isovector pairing as the dominant coupling scheme in N = Z nuclei approaching the doubly magic nucleus (100)Sn.
Place, publisher, year, edition, pages
American Physical Society , 2011. Vol. 84, no 2, 021301- p.
IdentifiersURN: urn:nbn:se:kth:diva-39048DOI: 10.1103/PhysRevC.84.021301ISI: 000293729700001ScopusID: 2-s2.0-80052227054OAI: oai:DiVA.org:kth-39048DiVA: diva2:439321
FunderSwedish Research Council, 623-2009-7340Swedish Research Council, 621-2010-3694Swedish Research Council, 2010-4723
QC 201109072011-09-072011-09-072015-04-29Bibliographically approved