Enhanced Core Polarization in 70Ni and 74Zn
O. Perru
(1)
,
O. Sorlin
(1, 2)
,
S. Franchoo
(1)
,
F. Azaiez
(1)
,
E. Bouchez
,
C. Bourgeois
(1)
,
A. Chatillon
,
J. M. Daugas
,
Z. Dlouhy
,
Zs. Dombrádi
,
C. Donzaud
(1)
,
L. Gaudefroy
(1)
,
H. Grawe
,
S. Grévy
(3)
,
D. Guillemaud-Mueller
(1)
,
F. Hammache
(1)
,
F. Ibrahim
(1)
,
Y. Le Coz
,
S. M. Lukyanov
,
I. Matea
(2, 4)
,
J. Mrazek
,
F. Nowacki
(5)
,
Yu.-E. Penionzhkevich
,
Francois de Oliveira Santos
(2)
,
F. Pougheon
(1)
,
M.G. Saint-Laurent
(2)
,
G. Sletten
,
M. Stanoiu
(1)
,
C. Stodel
(2)
,
Ch. Theisen
,
D. Verney
(1)
E. Bouchez
- Function : Author
A. Chatillon
- Function : Author
J. M. Daugas
- Function : Author
Z. Dlouhy
- Function : Author
Zs. Dombrádi
- Function : Author
H. Grawe
- Function : Author
Y. Le Coz
- Function : Author
S. M. Lukyanov
- Function : Author
J. Mrazek
- Function : Author
F. Nowacki
- Function : Author
- PersonId : 748924
- IdHAL : frederic-nowacki
- ORCID : 0000-0002-7854-8717
Yu.-E. Penionzhkevich
- Function : Author
Francois de Oliveira Santos
- Function : Author
- PersonId : 176640
- IdHAL : francois-de-oliveira-santos
- ORCID : 0000-0003-4539-5985
- IdRef : 157826392
G. Sletten
- Function : Author
C. Stodel
- Function : Author
- PersonId : 177922
- IdHAL : christelle-stodel
- ORCID : 0000-0003-4658-2213
- IdRef : 227006291
Ch. Theisen
- Function : Author
- PersonId : 8104
- IdHAL : christophe-theisen
- ORCID : 0000-0002-8509-1022
- IdRef : 160554306
Abstract
The reduced transition probabilities B(E2;0+\rightarrow 2+_1) of the neutron-rich 74Zn and 70Ni nuclei have been measured by Coulomb excitation in a 208Pb target at intermediate energy. These nuclei have been produced at Grand Accélérateur National d'Ions Lourds via interactions of a 60A MeV 76Ge beam with a Be target. The B(E2) value for 70Ni_42 is unexpectedly large, which indicates that neutrons added above N=40 strongly polarize the Z=28 proton core. In the Zn isotopic chain, the steep rise of B(E2) values beyond N=40 continues up to 74Zn 44. The enhanced proton core polarization in 70Ni is attributed to the monopole interaction between the neutron in the g_9/2 and protons in the f_7/2 and f_5/2 spin-orbit partner orbitals. This interaction could result in a weakening of magicity in 78Ni_50.