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
Published in
Physical Review C - Nuclear Physics
05562813 (ISSN) 1089490x (eISSN)
Vol. 77 Issue 6Categorizing
Subject Categories (SSIF 2011)
Subatomic Physics
Physical Sciences
Identifiers
DOI
10.1103/PhysRevC.77.064303