Studies on the double-beta decay nucleus Zn-64 using the (d,He-2) reaction
Journal article, 2008
The (d,He-2) charge-exchange reaction on the double-beta decay (beta beta) nucleus Zn-64 has been studied at an incident energy of 183 MeV. The two protons in the S-1(0) state (indicated as He-2) were both momentum analyzed and detected simultaneously by the BBS magnetic spectrometer and its position-sensitive detector. He-2 spectra with a resolution of about 115 keV (FWHM) have been obtained allowing identification of many levels in the residual nucleus Cu-64 with high precision. Zn-64 is one of the rare cases undergoing a beta beta decay in beta(+) direction. In the experiment presented here, Gamow-Teller (GT(+)) transition strengths have been extracted. Together with the GT(-) transition strengths from Ni-64(He-3,t) data to the same intermediate nucleus Cu-64, the nuclear matrix elements of the beta beta decay of Zn-64 have been evaluated. Finally, the GT(+/-) distributions are compared with shell-model calculations and a critical assessment is given of the various residual interactions presently employed for the pf shell.
weak interaction rates
gamow-teller strength
mass range a=45-65
pf-shell
matrix-elements
intermediate energies
particle-hole strength
capture
shell-model calculations
charge-exchange reactions
Author
E. W. Grewe
C. Baumer
H. Dohmann
D. Frekers
M. N. Harakeh
S. Hollstein
Håkan T Johansson
Chalmers, Applied Physics, Subatomic Physics
K. Langanke
G. Martinez-Pinedo
F. Nowacki
I. Petermann
L. Popescu
S. Rakers
D. Savran
K. Sieja
H. Simon
J. H. Thies
A. M. van den Berg
H. J. Wortche
A. Zilges
Physical Review C - Nuclear Physics
24699985 (ISSN) 24699993 (eISSN)
Vol. 77 6Subject Categories
Subatomic Physics
Physical Sciences
DOI
10.1103/PhysRevC.77.064303