Gamow-Teller transitions studied in the high-resolution Ni64(He3,t)Cu64 reaction

L. Popescu, T. Adachi, G. P.A. Berg, P. Von Brentano, D. Frekers, D. De Frenne, K. Fujita, Y. Fujita, E. W. Grewe, M. N. Harakeh, K. Hatanaka, E. Jacobs, K. Nakanishi, A. Negret, Y. Sakemi, Y. Shimbara, Y. Shimizu, Y. Tameshige, A. Tamii, M. UchidaH. J. Wörtche, M. Yosoi

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Abstract

To study the Gamow-Teller (GT) transitions to the pf-shell nucleus Cu64, the Ni64(He3,t)Cu64 experiment was performed at the Research Center for Nuclear Physics (RCNP) Ring Cyclotron, Osaka, using a He3 beam of 140 MeV/nucleon. The outgoing tritons were momentum analyzed by the Grand Raiden spectrometer at 0°. A high energy resolution of 32 keV (full width at half-maximum) allowed the separation of individual levels in the excitation-energy region from 0 to 3.5 MeV. In addition to the ground state (gs), known to be a Jπ=1+ GT state, many low-lying states showed L=0 nature, suggesting that they are candidates for GT states. Because the GT strength B(GT) for the gs transition is known from the β-decay measurement, the strengths for the excited states could be determined using the proportionality between the B(GT) and the reaction cross section extrapolated to q=0 momentum transfer. At higher excitation energies, the level density becomes high and the so-called GT giant resonance dominates the spectrum. The lower and the upper limits of the strength contained in this energy region were estimated. Our results show that less than 55% of the strength predicted by the Ikeda sum rule is located in the excitation-energy region from 0 to 17 MeV.

Original languageEnglish
Article number064312
JournalPhysical Review C - Nuclear Physics
Volume79
Issue number6
DOIs
Publication statusPublished - 2009 Jun 12

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Popescu, L., Adachi, T., Berg, G. P. A., Von Brentano, P., Frekers, D., Frenne, D. D., Fujita, K., Fujita, Y., Grewe, E. W., Harakeh, M. N., Hatanaka, K., Jacobs, E., Nakanishi, K., Negret, A., Sakemi, Y., Shimbara, Y., Shimizu, Y., Tameshige, Y., Tamii, A., ... Yosoi, M. (2009). Gamow-Teller transitions studied in the high-resolution Ni64(He3,t)Cu64 reaction. Physical Review C - Nuclear Physics, 79(6), [064312]. https://doi.org/10.1103/PhysRevC.79.064312