Abstract
The (p, t) reaction was studied at 22 MeV proton energy using targets of230,232Th and234,236,238U. In228Th we observed in addition to the 832 keV first-excited 0+ level a second-excited 0+ level at 939 keV populated with 5% of the ground-state strength. A 0+ level proposed recently in232U at 927 keV was not observed in the (p, t) reaction, with an upper limit for its excitation of 0.2% of the ground-state strength. In234U a level at 1045 keV, assigned in the literature as second-excited 0+ level, is weakly populated in the (p, t) reaction but does not show the angular distribution characteristic for single-stepL=0 transfer. In236U we observed a level at 1036 keV with an angular distribution suggesting that it might be a doublet composed of a known 3− level and a new 0+ level. The properties of the first two excited 0+ bands in228Th,232U and234U are compared and discussed.
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Communicated by D. Schwalm
This work was supported by the Deutsche Forschungsgemeinschaft (grants Bo 1109/1-1, Gr 894/2-1 and Gu 179/3-2) and by the Volkswagen Stiftung
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Baltzer, H., deBoer, J., Gollwitzer, A. et al. Study of low-lying 0+ excitations in228Th and232,234,236U in the (p, t) reaction. Z. Physik A - Hadrons and Nuclei 356, 13–21 (1996). https://doi.org/10.1007/s002180050142
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DOI: https://doi.org/10.1007/s002180050142