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Superheavy nuclei: single-particle energies & limits Teng Lek Khoo

Superheavy nuclei: single-particle energies & limits Teng Lek Khoo. Single-particle energies Gaps in particle spectrum  E shell  s uperheavy nuclei. Necessary for accurate theoretical description .  Magic gaps.

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Superheavy nuclei: single-particle energies & limits Teng Lek Khoo

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  1. Superheavy nuclei: single-particle energies & limitsTeng Lek Khoo Single-particle energies Gaps in particle spectrum Eshell superheavy nuclei. Necessary for accurate theoretical description.  Magic gaps.  Decisive tests of best models (e.g. demonstrated that DFTs need improvement). Data from decay spectroscopy: high-K isomers, α-, α-electron. Z = 107,108 Limits in I, E*, Z & N  Bf(I,E*,Z,N) & Eshell(I,E*,Z,N). Data from in-beam spectroscopy: entry distributions (I,E) & high-spin structure. Z = 104, 106 T. L. Khoo, ATLAS W'shop 2009

  2.  T. L. Khoo, ATLAS W'shop 2009

  3. Single-particle energies: “experiment” vs. theory    Esp Proton Esp, valid to Z=102 (E2qp 254No) & Z=103 (E1qp255Lr) T. L. Khoo, ATLAS W'shop 2009

  4. Initial states for γ decay to g.s. T. L. Khoo, ATLAS W'shop 2009

  5. Imax(254No) > Imax(220Th)! Bf(254No) > Bf(220Th) (b)220Th90 176Yb(48Ca,4n) Imax =20 223 MeV (a) 254No102 Yield (arbitrary units) Imax =32 219 MeV Imax =20 >5 MeV ~8 MeV 0 20 I (hbar) 10 30 208Pb(48Ca,2n) T. L. Khoo, ATLAS W'shop 2009

  6. Requirements(for Z = 103-108,  > 0.1 nb) • High beam intensity: 1-5 pA • Efficient recoil separator >50%. New gas-filled separator. • Decay spectroscopy: efficient isomeric electron &  array (>25%  peak efficiency at ~300 keV). • In-beam spectroscopy: Gammasphere & Gretina; calorimetry for entry distribution measurements. T. L. Khoo, ATLAS W'shop 2009

  7. extras T. L. Khoo, ATLAS W'shop 2009

  8. Strategy • Compare experiment vs. theory. • For a theory to be credible, it must first be validated: it must at least correctly describe what is known. T. L. Khoo, ATLAS W'shop 2009

  9. Proton gap (~2.2 MeV) at 114 – if WS continues to apply for Z>102. X X ? Where are the magic gaps? Macroscopic/Microscopic (MM), Skyrme (SHF) & Relativistic (RMF) mean field. T. L. Khoo, ATLAS W'shop 2009

  10. Need data on nuclei with high ZZ ~103 -108 >~ 0.1 nbE(proton single-particle)  Z = 114 gap.E(neutron single-particle)  N = 184 gap T. L. Khoo, ATLAS W'shop 2009

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