First spectroscopy of 61Ti and the transition to the Island of Inversion at N=40

Wimmer, K. and Recchia, F. and Lenzi, M. and Ricetto, S. and Davinson, T. and Estrade, A. and Griffin, C. and Nishimura, S. and Nowacki, F. and Phong, V. and Poves, A. and Söderström, P. and Aktas, O. and Al-Aqeel, M. and Ando, T. and Baba, H. and Bae, S. and Choi, S. and Doornenbal, P. and Ha, J. and Harkness-Brennan, L. and Isobe, T. and John, P. and Kahl, D. and Kiss, G. (2019) First spectroscopy of 61Ti and the transition to the Island of Inversion at N=40. Physics Letters B, 792. pp. 16-20. ISSN 0370-2693

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Abstract

Isomeric states in 59,61Ti have been populated in the projectile fragmentation of a 345AMeV 238U beam at the Radioactive Isotope Beam Factory. The decay lifetimes and delayed γ-ray transitions were measured with the EURICA array. Besides the known isomeric state in 59Ti, two isomeric states in 61Ti are observed for the first time. Based on the measured lifetimes, transition multipolarities as well as tentative spins and parities are assigned. Large-scale shell model calculations based on the modified LNPS interaction show that both 59Ti and 61Ti belong to the Island of Inversion at N=40with ground state configurations dominated by particle-hole excitations to the g9/2and d5/2orbits.

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