Seniority structure of Xe 82 136

摘要: The level structure of the $N=82$ nucleus $^{136}\mathrm{Xe}$ was studied with inelastic neutron scattering reaction followed by $\ensuremath{\gamma}$-ray detection. A number spins and parities were reassigned, many lifetimes determined for first time using Doppler-shift attenuation method. New shell-model calculations also performed both full $Z=50$--82 model space, a reduced space including only $1{d}_{5/2}$ $0{g}_{7/2}$ orbitals. This new information characterizing used to identify seniority low-lying levels assign ${(\ensuremath{\pi}0{g}_{7/2})}_{\ensuremath{\upsilon}=0}^{4}$, ${(\ensuremath{\pi}0{g}_{7/2})}_{\ensuremath{\upsilon}=2}^{4}$, ${(\ensuremath{\pi}0{g}_{7/2})}_{\ensuremath{\upsilon}=4}^{4}$, $(\ensuremath{\pi}1{d}_{5/2}){(\ensuremath{\pi}0{g}_{7/2})}_{\ensuremath{\upsilon}=1}^{3}$, ${(\ensuremath{\pi}1{d}_{5/2})}^{2}{(\ensuremath{\pi}0{g}_{7/2})}_{\ensuremath{\upsilon}=0}^{2}$ configurations describe all observed states below 2.8 MeV.