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Beta decay and Structure of Exotic Nuclei near 78 Ni

Beta decay and Structure of Exotic Nuclei near 78 Ni. Alexander Lisetskiy NSCL, JINA, MSU. Motivation. Astrophysical r-process Recent experimental progress for neutron-rich nuclei Lack of shell model effective interactions for exotic regions.

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Beta decay and Structure of Exotic Nuclei near 78 Ni

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  1. Beta decay and Structure of Exotic Nuclei near 78Ni Alexander Lisetskiy NSCL,JINA,MSU

  2. Motivation • Astrophysical r-process • Recent experimental progress for neutron-rich nuclei • Lack of shell model effective interactions for exotic regions

  3. Where are exotic nuclei?

  4. Shell Model Effective Interaction

  5. T=1 interaction and SPE sources A. F. Lisetskiy, B. A. Brown, M. Horoi PRC 70, 044314, (2004) Ni isotopes + N=50 isotones G-matrix Bonn-C potential 56Ni core

  6. Single particle energies 57Ni 77Ni 79Cu 99In g9/2 g9/2 g9/2-1 p1/2 g9/2-1 p1/2-1 f5/2 p1/2 p1/2-1 f5/2-1 p3/2 p3/2-1 p3/2 p3/2-1 f5/2 f5/2-1

  7. Cu: spectra and magnetic moments A.F. Lisetskiy, B. A. Brown, M. Horoi, EPJ direct (2005) L. Weissman & U. Koester, Private communication

  8. Ni: Beta-decay properties

  9. 75Ni and 78Ni: B(GT) distribution

  10. T=0 interaction and SPE modifications Cu isotopes + N=49,48 isotones ejp= ejn+ S jn’Vmon(jp,jn’)

  11. New Single Particle Energies 57Ni 77Ni 79Cu 99In g9/2 g9/2 g9/2-1 g9/2-1 p1/2 p1/2 p1/2-1 p1/2-1 f5/2 f5/2-1 p3/2 p3/2-1 p3/2 p3/2-1 f5/2 f5/2-1

  12. Ni: New Beta-decay results P. T. Hosmer et al., PRL 94, 112501 (2005)

  13. 75Ni: New B(GT) distribution New results Old results

  14. 76Ni: New B(GT) distribution New results Old results

  15. 78Ni: Microscopic structure of GT strength distribution

  16. Cu isotopes P. T. Hosmer, in preparation …

  17. Summary • Improved shell model effective interaction • for the p3/2p1/2f5/2g9/2space in action • Good agreement between theory and experiment for Ni isotopes indicates reliability of the interaction • Good description of T1/2 and Pnvalues for Cu isotopes • Beta decay data provide important information where nuclear structure data are missing • Extended studies of Cu, Zn, Ga, Ge

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