Seeking the phase transition where Cd, Ag, Pd, Rh, and Ru isotopes become “neutron rich”: Isomeric decay in 125,126,127Cd, 123,124,125Ag, 121Pd, 120Rh, and 117Ru
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, 48824, USA
2 Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
3 Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, 20742, USA
Published online: 8 December 2007
Gamma rays have been identified in the decay of isomers in 125,126,127Cd, 123,124,125Ag, 121Pd, 120Rh, and 117Ru that provide information about the low-energy structures of these nuclei. In turn, comparison of low-energy levels in the Cd and Te isotones reveals that, whereas the yrast structures in the Te isotopes rise smoothly as N approaches the closed shell at 82, the 15/2- to 11/2- transitions level off as N exceeds 76. This is identified as the point where the Cd isotopes undergo a phase transition and become “neutron rich”.
PACS: 25.70.Mn – Projectile and target fragmentation / 23.20.Lv – Gamma transitions and level energies
© EDP Sciences, Springer-Verlag, 2007