Speaker
Description
In recent years, neutron-rich titanium isotopes have been within the interests of nuclear physicists for several reasons. In particular 58Ti in the context of the 64Cr Island of Inversion and 56Ti in connection with the new N = 32,34 magic numbers observed in the Ca isotopic chain.
The boundaries of the 64Cr island of inversion are still not completely established and with the most neutron-rich Ti isotopes we're approaching them. While 59Ti and 61Ti have been confirmed to have a significant component of g9/2 and d5/2 orbitals in the ground state, the ground-state configuration in 58Ti still remains unknown and so, its place within the IoI.
The spectroscopic observables of E(2+) and B(E2) for the next even-even nucleus in the titanium isotopic chain - 56Ti with 34 neutrons - have been measured in the past. While the E(2+) value supports the hypothesis that the N=34 magic number vanishes for Ti isotopes, a more precise measurement of the B(E2) value in 56Ti is required to draw further conclusions.
To address the discussed issues, an in-flight Coulomb-excitation experiment was performed at RIKEN.The combination of high intensity beams produced by the BigRIPS fragment separator and the high resolution gamma-ray spectroscopy setup HiCARI allowed for the simultaneous determination of B(E2) values from excitation cross sections as well as lifetime measurements.
In this talk, I will present the preliminary experimental results. A measurement of the B(E2) value for 58Ti and its comparison with theoretical calculations will determine whether it belongs to the IoI. An analogous measurement for 56Ti will tell us more about collectivity in this isotope and persistence of the N=34 magic number.