Multiparticle configurations in N=84 isotones located at the proton drip line

摘要: Excited states in the proton-rich $N=84$ isotones ${}_{72}^{156}{\mathrm{Hf}}_{84},\phantom{\rule{0.3em}{0ex}}{}_{73}^{157}{\mathrm{Ta}}_{84}$, and ${}_{74}^{158}{W}_{84}$ were observed using $^{102}\mathrm{Pd}(^{58}\mathrm{Ni},\phantom{\rule{0.3em}{0ex}}\mathit{xp}2n)$ reactions at 270 MeV. \ensuremath{\gamma} rays detected with Gammasphere array of Compton-suppressed Ge detectors coupled Argonne fragment mass analyzer assigned to individual reaction channels recoil-decay tagging method. Prompt \ensuremath{\gamma}-ray cascades associated \ensuremath{\alpha} decay both ground state ${8}^{+}$ isomeric $^{156}\mathrm{Hf}$, ${h}_{11/2}$ $^{157}\mathrm{Ta}$, $^{158}\mathrm{W}$. The level schemes constructed for $^{156}\mathrm{Hf},^{157}\mathrm{Ta}$, $^{158}\mathrm{W}$ are compared these lighter discussed within framework shell model.