1. Beta decay and Structure of Exotic Nuclei near 78 Ni 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 Ni isotopes + N=50 isotones G-matrix Bonn-C potential 56 Ni core A. F. Lisetskiy, B. A. Brown, M. Horoi PRC 70, 044314, (2004)

6. Single particle energies 57 Ni 77 Ni 79 Cu 99 In p 3/2 f 5/2 g 9/2 p 1/2 g 9/2 -1 p 1/2 -1 f 5/2 -1 p 3/2 -1 f 5/2 -1 p 3/2 -1 p 1/2 -1 g 9/2 -1 g 9/2 p 1/2 f 5/2 p 3/2

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

10. T=0 interaction and SPE modifications Cu isotopes + N=49,48 isotones e j p = e j n + S j n ’ V mon (j p,j n ’ )

11. New Single Particle Energies 57 Ni 77 Ni 79 Cu 99 In p 3/2 f 5/2 g 9/2 p 1/2 g 9/2 -1 p 1/2 -1 f 5/2 -1 p 3/2 -1 f 5/2 -1 p 3/2 -1 p 1/2 -1 g 9/2 -1 g 9/2 p 1/2 f 5/2 p 3/2

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

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

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

15. 78 Ni: Microscopic structure of GT strength distribution

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

17. Summary Improved shell model effective interaction for the p 3/2 p 1/2 f 5/2 g 9/2 space in action Good agreement between theory and experiment for Ni isotopes indicates reliability of the interaction Good description of T 1/2 and P n values for Cu isotopes Beta decay data provide important information where nuclear structure data are missing Extended studies of Cu, Zn, Ga, Ge