Speaker
Description
The nuclear structure of neutron-rich nuclei around A ∼ 100 shows shape transitions and large deformations. Among others, these include ellipsoidal oscillation of the shape (γ-vibrations). One-phonon γ-bands are observed in numerous deformed nuclei, however, observations of two or higher-order phonon γ-bands are rare. While the even-Z nuclei have been well investigated, the spectroscopy of odd-odd nuclei in this region can provide deeper insights into our understanding. As part of a study of the evolution of the structure of even-odd and odd-odd neutron-rich Nb isotopes, the structure of 104Nb was investigated in detail. The Nb nuclei were populated in fission reactions and measured using gamma-ray spectroscopy in two complementary ways using a) isotopically identified fragment produced in beam fusion and transfer induced fission in the 238U+9Be system using the VAMOS++ and the AGATA spectrometer and b) high statistics γ-γ-γ and γ-γ-γ-γ fold data from the spontaneous fission of 252Cf using GAMMASPHERE. The talk will discuss the complementarity of the two methods necessary for studying neutron-rich nuclei at high spin, especially for odd-odd nuclei. The data are then systematically compared with neighboring multi-phonon γ-vibrational bands to address the interesting observation for the first time of multi-phonon vibrational bands in 104Nb.
