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Investigations of proton-neutron correlations close to the drip line
KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.ORCID-id: 0000-0003-1771-2656
Vise andre og tillknytning
2010 (engelsk)Inngår i: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 82, nr 2, s. 024307-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Proton-neutron correlations in nuclei above the Z = 50 shell closure are investigated with the aim of understanding the behavior of the 2(+) and 4(+) states in Te and Xe isotopes, which remain at a rather constant energy as one approaches the shell closure at N = 50. Our calculations reveal that standard quasiparticle random phase approximation calculations, involving a quadrupole-quadrupole (QQ) interaction with constant strengths, cannot explain this feature. It is found that to reproduce the experimental data within this model one has to include a variable proton-neutron interaction. It turns out that an increased proton-neutron QQ interaction increases the collectivity (i.e., B(E2) values) when approaching the N = 50 region, whereas an increased proton-neutron pairing interaction decreases the collectivity. We thus conclude that the ratio between the B(E2) value and 2(+) energy is a "fingerprint" of proton-neutron collectivity and it should be determined in future experiments concerning light Te isotopes. Based on this criterion, we conclude that the available experimental data indicate an enhanced proton-neutron pairing interaction by approaching doubly magic Z = N = 20 and Z = N = 28 regions.

sted, utgiver, år, opplag, sider
2010. Vol. 82, nr 2, s. 024307-
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Identifikatorer
URN: urn:nbn:se:kth:diva-26867DOI: 10.1103/PhysRevC.82.024307ISI: 000280759100001Scopus ID: 2-s2.0-77956154478OAI: oai:DiVA.org:kth-26867DiVA, id: diva2:373698
Merknad
QC 20101201Tilgjengelig fra: 2010-12-01 Laget: 2010-11-29 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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