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

Decay- and in-beam spectroscopy of heavy nuclei at the proton dripline Triple-shape coexistence. Three low-lying 0 + states in 186 Pb observed in the alpha decay of 190 Po. PROLATE. OBLATE. SPHERICAL. Where is the OBLATE band?. A. Andreyev et al. Nature 405 (2000) 430.

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

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

  2. Three low-lying 0+ states in 186Pb observed in the alpha decay of 190Po PROLATE OBLATE SPHERICAL Where is theOBLATE 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. 182Pb Spherical ground state and a low-lying prolate structure Alpha tagged gamma rays from 182Pb 144Sm(42Ca,4n)182Pb 300nb D. Jenkins et al. PRC 62, 021302(R)

  5. Even-mass Pb isotopes Level systematics

  6. 197At 195Bi 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 : 185Bi102 - proton emitter

  8. Decay properties of 185Bi 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 93Nb(95Mo,3n)185Bi, 95Mo(92Mo,pn)185Bi, 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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