Beta decay and
Structure of Exotic
Nuclei near 78Ni
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
Where are exotic nuclei?
Shell Model Effective Interaction
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
Single particle energies
57Ni 77Ni 79Cu 99In
g9/2
-1
g9/2
g9/2
p1/2 g9/2-1
p1/2-1
f5/2 p p1/2-1
f5/2-1 1/2
p3/2
p3/2-1 p3/2 p3/2-1
f5/2
f5/2-1
Cu: spectra and magnetic moments
A.F. Lisetskiy, B. A. Brown,
M. Horoi, EPJ direct (2005)
L. Weissman & U. Koester,
Private communication
Ni: Beta-decay properties
75Ni and 78Ni: B(GT) distribution
T=0 interaction and SPE modifications
ej = ej + S ’
jn’Vmon(jp,jn )
p n
Cu isotopes +
N=49,48 isotones
New Single Particle Energies
57Ni 77Ni 79Cu 99In
g9/2
g9/2
g9/2-1
g9/2-1
p1/2
p1/2 -1 p1/2-1
p1/2
f5/2
f5/2-1 p3/2
p3/2-1
p3/2 p3/2-1
f5/2
f5/2-1
Ni: New Beta-decay results
P. T. Hosmer et al., PRL 94, 112501 (2005)
75Ni: New B(GT) distribution
New results
Old results
76Ni: New B(GT) distribution
New results
Old results
78Ni:Microscopic structure of
GT strength distribution
Cu isotopes
P. T. Hosmer,
in preparation …
Summary
• Improved shell model effective interaction
for the p3/2p1/2f5/2g9/2 space in action
• Good agreement between theory and
experiment for Ni isotopes indicates reliability of
the interaction
• Good description of T1/2 and Pn values for Cu
isotopes
• Beta decay data provide important information
where nuclear structure data are missing
• Extended studies of Cu, Zn, Ga, Ge