Study of fission process and neutron-rich nuclei

• Published in: Nuclear physics. A 2007-05, Vol.787 (1), p.231-236
• Main Authors: Goodin, C., Luo, Y.X., Hwang, J.K., Ramayya, A.V., Hamilton, J.H., Rasmussen, J.O., Zhu, S.J., Gelberg, A., Ter-Akopian, G.M.
• Format: Article
• Language: English
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2006.12.037

Prompt triple γ coincidence studies of the nuclei produced in the spontaneous fission of 252Cf were carried out at Gammasphere. The relative yield matrix for the Ba-Mo and Ba- α-Zr charge splits was determined using an improved analysis. An upper limit for the second mode of 0.5 % is found for the binary case, while the ternary case shows evidence of a strong second mode. Half-lives of several states in neutron-rich nuclei were measured by using a new time-gated γ − γ − γ coincidence technique. A large deformation of β = 0.47 was observed in 104Zr using this method. New band structures were found in several odd-A Y, Nb, Tc, and Rh nuclei. These nuclei show a smooth evolution from axial symmetry in Y to maximum triaxiality in Rh. Particle plus triaxial rotor calculations have been made for these odd-A nuclei. The gamma band staggering in 108,110,112Ru will be discussed.