$\beta$ decays of the heaviest $N=Z-1$ nuclei and proton instability of $^{97}\mathrm{In}$

J. Park , R. Krücken , D. Lubos , R. Gernhäuser , M. Lewitowicz (1) , S. Nishimura , D.S. Ahn , H. Baba , B. Blank (2) , A. Blazhev , P. Boutachkov , F. Browne , I. Celikovic (1) , G. de France (1) , P. Doornenbal , T. Faestermann , Y. Fang , N. Fukuda , J. Giovinazzo (2) , N. Goel , M. Górska , H. Grawe , S. Ilieva , N. Inabe , T. Isobe , A. Jungclaus , D. Kameda , G.D. Kim , Y.K. Kim , I. Kojouharov , T. Kubo , N. Kurz , G. Lorusso , K. Moschner , D. Murai , I. Nishizuka , Z. Patel , M.M. Rajabali , S. Rice , H. Sakurai , H. Schaffner , Y. Shimizu , L. Sinclair , P.A. Söderström , K. Steiger , T. Sumikama , H. Suzuki , H. Takeda , Z. Wang , H. Watanabe , J. Wu , Z.Y. Xu

1 GANIL - Grand Accélérateur National d'Ions Lourds
2 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan

We report on new or more precise half-lives, β-decay endpoint energies, and β-delayed proton emission branching ratios of Pd91, Cd95, In97, and Sn99. The measured values are consistent with known mirror transitions in lighter Tz=−1/2 nuclei, shell-model calculations, and various mass models. In addition to the β-decaying (9/2+) ground state, circumstantial evidence for a short-lived, proton-emitting isomer with spin (1/2−) was found in In97. Based on the experimental data, a semiempirical theory on proton emission, and shell-model calculations, the proton separation energy of the In97 ground state was determined to be −0.10±0.19 MeV. The existence of the short-lived, proton-unstable (1/2−) isomer in In97 establishes Cd96 as an rp-process waiting point.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

J. Park, R. Krücken, D. Lubos, R. Gernhäuser, M. Lewitowicz, et al.. $\beta$ decays of the heaviest $N=Z-1$ nuclei and proton instability of $^{97}\mathrm{In}$. Phys.Rev.C, 2018, 97 (5), pp.051301. ⟨10.1103/PhysRevC.97.051301⟩. ⟨hal-01796816⟩