Study of low-lying 0+ excitations in228Th and232,234,236U in the (p,t) reaction |
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| Authors: | H Baltzer J deBoer A Gollwitzer G Graw C Günther A I Levon M Loewe H J Maier J Manns U Müller B D Valnion T Weber M Würkner |
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| Institution: | 1. Institut für Strahlen- und Kernphysik, Universit?t Bonn, Nussallee 14, D-53115, Bonn, Germany
2. Sektion Physik, Universit?t München, Am Coulombwall 1, D-85748, Garching, Germany
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| 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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