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

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Presentation on theme: "Decay- and in-beam spectroscopy of heavy nuclei at the proton dripline Triple-shape coexistence."— Presentation transcript:

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

2 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

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

4 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)

5 Even-mass Pb isotopes Level systematics

6 197 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

7 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

8 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.....

9 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


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