Angular momentum population for the neutron-deficient lead nuclei produced following the relativistic projectile fragmentation of Pb

Shizuma, Toshiyuki; Podolyk, Z.*; Pietri, S.*; Steer, S. J.*; Werner-Malento, E.*; Regan, P. H.*; Rudolph, D.*; Garnsworthy, A. B.*; Hoischen, R.*; Grska, M.*

We report a result from the measurement of production ratios for isomeric states in neutron-deficient lead nuclei produced following the relativistic projectile fragmentation of Pb. This work forms part of the Rare Isotope Investigations at GSI (RISING) project. The isomeric states in the Pb region were populated using projectile fragmentation of the 1 GeV Pb beam provided using the heavy-ion synchrotron (SIS) at GSI. The fragments producedin the reaction were separated and identified by the FRagment Separator (FRS). Delayed rays emitted from the known 11 and 12 isomers of the neutron deficient nucleus Pb were observed and the corresponding isomeric ratios were determined. The results are compared with a model based on the statistical abrasion-ablation process of relativistic fragmentation and simple assumptions concerning -ray cascade transition in the final nucleus.