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Investigations of proton-neutron correlations close to the drip line
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.ORCID iD: 0000-0003-1771-2656
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2010 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 82, no 2, 024307- p.Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
2010. Vol. 82, no 2, 024307- p.
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Physical Sciences
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URN: urn:nbn:se:kth:diva-26867DOI: 10.1103/PhysRevC.82.024307ISI: 000280759100001Scopus ID: 2-s2.0-77956154478OAI: oai:DiVA.org:kth-26867DiVA: diva2:373698
Note
QC 20101201Available from: 2010-12-01 Created: 2010-11-29 Last updated: 2017-12-12Bibliographically approved

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Cederwall, Bo

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