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Alexander Lisetskiy

Beta-decay of neutron-rich Ni and Cu isotopes in a shell model approach. Alexander Lisetskiy. Hirschegg 2006. Exotic regions. Shell Model Effective Interaction. Fitting Landscape. F. Lisetskiy, B. A. Brown, M. Horoi, H. Grawe, PRC 70, 044314, (2004).

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Alexander Lisetskiy

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  1. Beta-decay of neutron-rich Ni and Cu isotopes in a shell model approach Alexander Lisetskiy Hirschegg 2006

  2. Exotic regions

  3. Shell Model Effective Interaction

  4. Fitting Landscape • F. Lisetskiy, B. A. Brown, • M. Horoi, H. Grawe, • PRC 70, 044314, (2004) Ni + Cu isotopes + N=49,48 isotones

  5. Nuclear structure phenomena near 78Ni • No seniority isomers in 72Ni and 74Ni • No high-spin isomers in 73Cu,75Cu and 77Cu • No 8+ isomers in 72Zn,74Zn,76Zn • 5/2- ground statein75Cu,77Cu and 79Cu • Pseudo-magicity of 68Ni

  6. Theoretical tools for beta-decay studies Global picture: Finite Range Droplet Model +QRPA (P. Moeller, K. L. Kratz) Self-consistent HF-BCS + continium QRPA (I. Borzov, S. Fayans) Local picture: Shell Model with effective interactions Unified picture for many different properties of particular nucleus

  7. Model Space

  8. b- (Z,A) n Sn (Z+1,A-1) Qb g (Z+1,A) beta-decay scheme Sn– neutron separation energy Pn– branching of beta delayed neutron emission Importance! Sn : for r-process path Pn : abundance pattern T1/2 : timescale, abundance pattern

  9. Ni beta-decay: Energetics Qb(A,Z) = M(A,Z) - M(A,Z+1)

  10. Ni beta-decay: Energetics Sn(A,Z) = B(A,Z) - B(A-1,Z)

  11. Ni beta-decay: Half-lives P. T. Hosmer et al., PRL 94, 112501 (2005) Quenching for Gamow -Teller operator: q=0.37! Common q value is 0.70-0.75

  12. Ni beta-decay: Half-lives Quenching factor is Q-value dependent

  13. Ni beta-decay: beta-delayed n-emission H. Schatz, in prep. (MSU data) Pn = GT branching for states with Qb > Eexc > Sn

  14. Cu beta-decay: Energetics Qb(A,Z) = M(A,Z) - M(A,Z+1)

  15. Cu beta-decay: Energetics Sn(A,Z) = B(A,Z) - B(A-1,Z)

  16. Cu beta-decay: Half-lives P. T. Hosmer et al., PRL 94, 112501 (2005) Quenching for Gamow -Teller operator: q=0.37! Common q value is 0.70-0.75

  17. Cu beta-decay: Half-lives Quenching factor is Q-value dependent

  18. Cu beta-decay: beta-delayed n-emission H. Schatz, in prep. (MSU data) Pn = GT branching for states with Qb > Eexc > Sn

  19. 75Ni: B(GT) distribution

  20. 78Ni: beta-decay x10 f7/2 included f7/2 included

  21. Summary & Outlook • Improved shell model effective interaction • for the p3/2p1/2f5/2g9/2space in action • Self-consistent good description of beta-decay • data for Ni and Cu isotopes • Strong quenching of GT strength: origin ? • Large-scale shell model calculations • Tests for Zn and Ga beta-decay • rp-process nuclei: 64Ge, 68Se • Role of first forbidden transitions

  22. Collaborators Alex Brown, NSCL, MSU Mihai Horoi, CMU Hendrik Schatz, JINA, NSCL, MSU GSI: K. Langanke G. Matrinez-Pinedo

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