Decay- and in-beam spectroscopy of heavy nuclei at the proton dripline Triple-shape coexistence

PROLATE OBLATE SPHERICAL Three low-lying 0 + states in 186 Pb observed in the alpha decay of 190 Po Where is the OBLATE band? A. Andreyev et al. Nature 405 (2000) 430

Nuclei at the proton dripline can be produced via stable- ion beam induced fusion evaporation reactions A large variety of beams is needed

Alpha tagged gamma rays from 182 Pb 144 Sm( 42 Ca,4n) 182 Pb 300nb 182 Pb Spherical ground state and a low-lying prolate structure D. Jenkins et al. PRC 62, (R)

Even-mass Pb isotopes Level systematics

197 At 195 Bi Influence of onset of deformation is seen in proton binding energies of low lying states in odd-mass At and Bi isotopes

For understanding the character of the low-lying states in the dripline Bi and At nuclei, more spectroscopic information is needed Physics case : 185 Bi proton emitter

Decay properties of 185 Bi can be studied at the focal plane of a recoil separator. Its excited states can be probed by employing in-beam RDT techniques. Possible reactions 93 Nb( 95 Mo,3n) 185 Bi, 95 Mo( 92 Mo,pn) 185 Bi, 50 nb But.....

Developments are needed 10 – 1000nA Mo beams needed Ion source developments Symmetric reactions Scattered beam at the focal plane of the separator Better recoil separators + high-granularity detector system at the focal plane High gamma-ray counting rates in in-beam measurements Digital electronics + high-granularity detectors