The nuclear structure of 229Pa from the 231Pa(p,t)229Pa and 230Th(p,2nγ)229Pa reactions

0+states and collective bands in228Th studied by the (p,Levon1, Graw2, Hertenberger3 et al. 2013Phys. Rev. CSelf Cite269700View full textAdd to dashboardCite

“…Intuitively, one would expect that a large B(E1)/B(E2) ratio might be characteristic for a twooctupole-phonon excitation, whereas a small ratio might indicate a shape oscillation. Such a picture is observed for 228 Th: large B(E1)/B(E2) ratios for the 0 from [3]) has to be considered additionally (see Fig. 13).…”

“…1643.8 keV. There are two close-lying levels at 1643.18 keV with spin 2 − or 3 − identified both in [2] and [7] and 1643.8 keV, respectively, as identified in [7] with an assignment of possible spins (2,3,4) + . Only the level at 1643.8 keV is observed in the (p,t) reaction with clear assignment of spin 4 + .…”

“…The total picture for 228 Th has to differ from the one for 230 Th, since the first one is considered as an octupole soft and the latter as a vibration-like nucleus. It would be interesting to compare the 0 + excitations in the even nucleus 228 Th and the odd nucleus 229 Pa, the data for which in the low-energy part of excitations are known from the publication [3].…”

“…After the first observation of a large number of excitations with the L = 0 + transfer in the (p,t) reaction seen in the odd nucleus 229 Pa [3], it was logical to investigate such excitations in the even-even nucleus 228 Th, since 229 Pa corresponds to 228 Th + p, as well as in other actinide nuclei. Such measurements were carried out for the nuclei 228 Th, 230 Th and 232 U, and the results of a limited analysis have been published in [4] (besides the earlier preliminary study of 228 Th and 232,234,236 U in [5]).…”

EnhancedT-odd,P-odd electromagnetic moments in reflection asymmetric nuclei

“…and 220 eV energy splitting within the parity doublet [11,55] and b) K = unidentified parity partner level [56,12] were made. In case a) our calculations give using the experimental value of the energy splitting the admixture coefficient α = 640 × 10 7 η and the Schiff moment in the laboratory frame, S = 230000 × 10 −8 η e cm.…”