摘要
89Ru was synthesized in the reaction of 58Ni (36Ar, 2p3n) on the basis of a 'p-γ' coincidence measurement by using a He-jet tape transport system, and its p-delayed proton emission with a half-life of (1.1 ±0.2) s was investigated. The p-delayed proton spectrum of 89Ru populating the low-lying states in 88Mo was obtained, and the final state proton branching ratios to the low-lying 2+ and 4 + states in88Mo were estimated to be 100:6. Based on the statistical model calculations, the ground state spin of 89Ru was preliminarily assigned to be 5/2+ or 7/2±, and the mass excess of 89Ru was deduced to be -59.5 MeV.
<sup>89</sup>Ru was synthesized in the reaction of <sup>58</sup>Ni （36Ar, 2p3n） on the basis of a "p-γ" coincidence measurement by using a He-jet tape transport system, and its p-delayed proton emission with a half-life of （1.1 ±0.2） s was investigated. The p-delayed proton spectrum of 89Ru populating the low-lying states in 88Mo was obtained, and the final state proton branching ratios to the low-lying 2+ and 4 + states in88Mo were estimated to be 100:6. Based on the statistical model calculations, the ground state spin of 89Ru was preliminarily assigned to be 5/2+ or 7/2±, and the mass excess of 89Ru was deduced to be -59.5 MeV.
