Toward the limit of nuclear binding on the $N=Z$ line: Spectroscopy of $^{96}$Cd

P.J. Davies , J. Park , H. Grawe , R. Wadsworth , R. Gernhäuser , R. Krücken , F. Nowacki (1) , D.S. Ahn , F. Ameil , H. Baba , T. Bäck , B. Blank (2) , A. Blazhev , P. Boutachkov , F. Browne , I. Celikovic (3) , M. Dewald , P. Doornenbal , T. Faestermann , Y. Fang , G. de France (3) , N. Fukuda , A. Gengelbach , J. Gerl , J. Giovinazzo (2) , S. Go , N. Goel , M. Górska , E. Gregor , H. Hotaka , S. Ilieva , N. Inabe , T. Isobe , D.G. Jenkins , J. Jolie , H.S. Jung , A. Jungclaus , D. Kameda , G.D. Kim , Y.-K. Kim , I. Kojouharov , T. Kubo , N. Kurz , M. Lewitowicz (3) , G. Lorusso , D. Lubos , L. Maier , E. Merchan , K. Moschner , D. Murai , F. Naqvi , H. Nishibata , D. Nishimura , S. Nishimura , I. Nishizuka , Z. Patel , N. Pietralla , M.M. Rajabali , S. Rice , H. Sakurai , H. Schaffner , Y. Shimizu , L.F. Sinclair , P.-A. Söderström , K. Steiger , T. Sumikama , H. Suzuki , H. Takeda , J. Taprogge , P. Thöle , S. Valder , Z. Wang , N. Warr , H. Watanabe , V. Werner , J. Wu , Z.Y. Xu , A. Yagi , K. Yoshinaga , Y. Zhu

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

A γ -decaying isomeric state (τ1/2 = 197$^{+19}_{−17}$ ns) has been identified in 96Cd, which is one α particle away from the last known bound N = Z nucleus, 100Sn. Comparison of the results with shell-model calculations has allowed a tentative experimental level scheme to be deduced and the isomer to be interpreted as a medium-spin negativeparity spin trap based on the coupling of isoscalar (T = 0) and isovector (T = 1) neutron-proton pairs. The data also suggest evidence for the population of a 9+ T = 1 state, which is predicted by shell-model calculations to be yrast. Such a low-lying T = 1 state, which is unknown in lighter mass even-even self-conjugate nuclei, can also be interpreted in terms of the coupling of T = 0 and T = 1 neutron-proton pairs.

Mots clés: Nuclear Structure

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

P.J. Davies, J. Park, H. Grawe, R. Wadsworth, R. Gernhäuser, et al.. Toward the limit of nuclear binding on the $N=Z$ line: Spectroscopy of $^{96}$Cd. Phys.Rev.C, 2019, 99 (2), pp.021302. ⟨10.1103/PhysRevC.99.021302⟩. ⟨hal-02017069⟩