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

Abstract

Isomeric states in 59,61Ti have been populated in the projectile fragmentation of a 345 AMeV 238U beam at the Radioactive Isotope Beam Factory. The decay lifetimes and delayed gamma-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=40 with ground state configurations dominated by particle-hole excitations to the g_9/2 and d_5/2 orbits.

arXiv commentPhys. Lett. B accepted

References in corpus (7)

• Effective interaction for pf-shell nuclei
• The realistic collective nuclear Hamiltonian
• Observation of new microsecond isomers among fission products of 345 MeV/nucleon 238U
• Observation of isotonic symmetry for enhanced quadrupole collectivity in neutron-rich 62,64,66Fe isotopes at N=40
• $\beta$ Decay and Isomeric Properties of Neutron-Rich Ca and Sc Isotopes
• Nuclear Structure Towards N=40 60Ca: In-beam gamma-ray Spectroscopy of 58,60Ti
• Beta-decay of Mn-65 to Fe-65

Cited by in corpus (6)

• The Neutron-Rich Edge of the Nuclear Landscape. Experiment and Theory
• A new study of the $N=32$ and $N=34$ shell gap for Ti and V by the first high-precision MRTOF mass measurements at BigRIPS-SLOWRI
• Large enhancement of total reaction cross sections at the edge of the island of inversion in Ti, Cr, and Fe isotopes
• Shell-model study of titanium isotopic chain with chiral two- and three-body forces
• Shell model results for ${}^{47-58}$Ca isotopes in the $fp$, $fp{g}_{9/2}$ and $fp{g}_{9/2}{d}_{5/2}$ model spaces
• Isomeric states in neutron-rich nuclei around $N=40$