Four γ-ray transitions belonging to the ground state band of the N=Z nucleus 88Ru are reported for the first time. The reaction 58Ni(32S,2nγ) at 105 MeV has been used, and the prompt γ rays were detected with the GASP array. The assignment of γ rays to 88Ru was made by combining information from GASP, the ISIS silicon ball, and the n-Ring neutron detector. The 88Ru nucleus is weakly deformed, with an E(2+) energy of 0.616 MeV and E(4+)/E(2+) ratio of 2.30. The evolution of the nuclear structure along the N=Z, N=44, and Z=44 lines is discussed. Unlike in other nuclei from the region, no sign of backbending is seen in 88Ru at a rotational frequency of ≈0.5 MeV, which might be a signature of the T=0 neutron-proton pairing in the N=Z nuclei.
Observation of the N=Z=44 88Ru nucleus
LUNARDI, SANTO;LENZI, SILVIA MONICA;PAVAN, PIETRO;
2001
Abstract
Four γ-ray transitions belonging to the ground state band of the N=Z nucleus 88Ru are reported for the first time. The reaction 58Ni(32S,2nγ) at 105 MeV has been used, and the prompt γ rays were detected with the GASP array. The assignment of γ rays to 88Ru was made by combining information from GASP, the ISIS silicon ball, and the n-Ring neutron detector. The 88Ru nucleus is weakly deformed, with an E(2+) energy of 0.616 MeV and E(4+)/E(2+) ratio of 2.30. The evolution of the nuclear structure along the N=Z, N=44, and Z=44 lines is discussed. Unlike in other nuclei from the region, no sign of backbending is seen in 88Ru at a rotational frequency of ≈0.5 MeV, which might be a signature of the T=0 neutron-proton pairing in the N=Z nuclei.
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