γ-ray linear polarization measurements and (g_9/2)^-3 neutron alignment in ⁹¹Ru

TY - JOUR

T1 - γ-ray linear polarization measurements and (g9/2)-3 neutron alignment in 91Ru

AU - Zheng, Y.

AU - de France, G.

AU - Clément, E.

AU - Dijon, A.

AU - Cederwall, B.

AU - Wadsworth, R.

AU - Bäck, T.

AU - Ghazi Moradi, F.

AU - Jawoeski, G.

AU - Nyako, B.M.

AU - Palacz, M.

AU - Sletten, Geirr

PY - 2013/4/22

Y1 - 2013/4/22

N2 - Linear polarization measurements have been performed for γ rays in 91Ru produced with the 58Ni(36Ar, 2p1nγ)91Ru 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 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 Jmax and Jmax-2 members of the seniority-three ν(g9/2) -3 multiplet.

AB - Linear polarization measurements have been performed for γ rays in 91Ru produced with the 58Ni(36Ar, 2p1nγ)91Ru 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 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 Jmax and Jmax-2 members of the seniority-three ν(g9/2) -3 multiplet.

U2 - 10.1103/PhysRevC.87.044328

DO - 10.1103/PhysRevC.87.044328

M3 - Journal article

SN - 2469-9985

VL - 87

JO - Physical Review C

JF - Physical Review C

IS - 4

M1 - 044328

ER -