1. Studies on the double-β decay nucleus Zn64 using the (d,He2) reaction
- Author
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Grewe, E.W., Bäumer, C., Dohmann, H., Frekers, D., Harakeh, M.N., Hollstein, S., Johansson, H., Langanke, K., Martinez-Pinedo, G., Nowacki, F., Petermann, I., Popescu, L.A., Rakers, S., Savran, D., Sieja, K., Simon, H., Thies, J., van den Berg, A.M., Wörtche, H.J., Zilges, A., KVI - Center for Advanced Radiation Technology, Research unit Astroparticle Physics, and Research unit Nuclear & Hadron Physics
- Subjects
GAMOW-TELLER STRENGTH ,CAPTURE ,MATRIX-ELEMENTS ,PF-SHELL ,SHELL-MODEL CALCULATIONS ,PARTICLE-HOLE STRENGTH ,WEAK INTERACTION RATES ,Nuclear Theory ,MASS RANGE A=45-65 ,CHARGE-EXCHANGE REACTIONS ,Nuclear Experiment ,INTERMEDIATE ENERGIES - Abstract
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.
- Published
- 2008