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gamma-ray linear polarization measurements and (g(9/2))(-3) neutron alignment in Ru-91
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2013 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 87, no 4, 044328- p.Article in journal (Refereed) Published
Abstract [en]

Linear polarization measurements have been performed for gamma rays in Ru-91 produced with the Ni-58(Ar-36,2p1n gamma)Ru-91 reaction at a beam energy of 111 MeV. The EXOGAM Ge clover array has been used to measure the gamma-gamma coincidences, gamma-ray linear polarization, and gamma-ray angular distributions. The polarization sensitivity of the EXOGAM clover detectors acting as Compton polarimeters has been determined in the energy range 0.3-1.3 MeV. Several transitions have been observed for the first time. Measurements of linear polarization and angular distribution have led to the firm assignments of spin differences and parity of high-spin states in Ru-91. More specifically, calculations using a semiempirical shell model were performed to understand the structures of the first and second (21/2(+)) and (17/2(+)) levels. The results are in good agreement with the experimental data, supporting the interpretation of the nonyrast (21/2(+)) and (17/2(+)) states in terms of the J(max) and J(max) - 2 members of the seniority-three nu(g(9/2))(-3) multiplet. DOI: 10.1103/PhysRevC.87.044328

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2013. Vol. 87, no 4, 044328- p.
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Natural Sciences
URN: urn:nbn:se:uu:diva-200346DOI: 10.1103/PhysRevC.87.044328ISI: 000317866200004OAI: oai:DiVA.org:uu-200346DiVA: diva2:623622
Available from: 2013-05-28 Created: 2013-05-27 Last updated: 2016-05-12

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Nyberg, Johan
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