Studies on the double-beta decay nucleus Zn-64 using the (d,He-2) reaction
Artikel i vetenskaplig tidskrift, 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



intermediate energies

particle-hole strength


shell-model calculations

charge-exchange reactions


E. W. Grewe

C. Baumer

H. Dohmann

D. Frekers

M. N. Harakeh

S. Hollstein

Håkan T Johansson

Chalmers, Teknisk fysik, Subatomär fysik

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

0556-2813 (ISSN) 1089-490X (eISSN)

Vol. 77


Subatomär fysik