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

E. W. Grewe ; C. Baumer ; H. Dohmann ; D. Frekers ; M. N. Harakeh ; S. Hollstein ; Håkan T. Johansson (Institutionen för fundamental 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 (0556-2813). Vol. 77 (2008), 6,
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: gamow-teller strength, charge-exchange reactions, shell-model calculations, particle-hole strength, weak interaction rates, mass range a=45-65, intermediate energies, matrix-elements, pf-shell, capture

Denna post skapades 2008-11-28. Senast ändrad 2017-10-06.
CPL Pubid: 79212


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Institutioner (Chalmers)

Institutionen för fundamental fysik, Subatomär fysik (2005-2013)



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