γ-ray linear polarization measurements and (g9/2)−3 neutron alignment in 91Ru

Zheng, Y. and de France, G. and Clément, E. and Dijon, A. and Cederwall, B. and Wadsworth, R. and Bäck, T. and Ghazi, Moradi F. and Jaworski, G. and Nyakó, Barna Mátyás and Nyberg, J. and Palacz, M. and Al-Azri, H. and de Angelis, G. and Atac, A. and Aktaş, Ö. and Bhattacharyya, S. and Brock, T. and Davies, P. J. and Di Nitto, A. and Dombrádi, Zsolt and Gadea, A. and Gál, János and Joshi, P. and Nyakóné Juhász, Katalin and Julin, R. and Jungclaus, A. and Kalinka, Gábor and Kownacki, J. and La Rana, G. and Molnár, József and Kunné Sohler, Dorottya and Timár, János (2013) γ-ray linear polarization measurements and (g9/2)−3 neutron alignment in 91Ru. PHYSICAL REVIEW C, 87 (4). ISSN 2469-9985

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Abstract

Linear polarization measurements have been performed for γ-rays in 91Ru produced with the 58Ni(36Ar, 2p1nγ)91 Ru reaction at a beam energy of 111 MeV. The EXOGAM Ge clover array has been used to measure the γ-γ coincidences, γ-ray linear polarization and γ-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 91Ru. More specifically, calculations using a semi-empirical 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 non yrast (21/2+ ) and (17/2+ ) states in terms of the Jmax and Jmax − 2 members of the seniority-three ν(g9/2)−3 multiplet.

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