Nuclear Data Sheets for A=138

Large–scale shell model calculations for 140Xe

“…The present results for the low-lying states slightly improve the agreement with the experimental data [16] compared with the previous calculations [7]. The calculated values of excitation energies of the J π = 10 + and J π = 12 + states are reproduced not so accurately but one should bear in mind, that the parameters of the problem we use, are fitted to the 138 Xe spectrum.…”

“…As in the previous calculations [7,10] scaling factors for the pairing-like components of the two-body potential were adopted. We will scale just the proton-proton J π = 0 + components by the factor of 0.85 as we find it optimal for reproducing the experimental values of the excitation levels up to J π = 12 + for 138 Xe [16].…”

Lifetime measurements in Nd138

“…The branching ratios are those in Ref. [31], with the exception of the 2 + 2 state, for which the averages of the values reported in Refs. [18,19] are used.…”

“…As the mixing ratio for this transition is not known, no reduced transition probability was deduced from the lifetime of the 7 − 2 state. In those cases where the decay of a state is fragmented to multiple final states, previously published branching ratios [18,19,31] were used to determine the transition strengths. The B(E2; 2 + 1 → 0 + 1 ) value for 138 Nd corresponds to 36(1) Weisskopf units (W.u.).…”

Study of impact factors on the decay heat calculation of neutron sufficient even-even nuclei of Te, Xe, Ba, Ce, Nd and Sm isotopes

“…Considering QRPA calculation, it could be seen clearly that for each isotope chain, the calculated deviation would increase with the neutron number, which also means the increase of the deformation. For gross calculation, the better results got for 138 Xe, 140 Xe, 144 Ba, 154 Nd and 158 Sm nu- [22][23][24][25][26][27][28][29][30][31][32][33] and calculated E β by the Gross [21,22] and QRPA; (e) Comparison between experimental [22][23][24][25][26][27][28][29][30][31][32][33] and calculated E γ by the Gross [21,22] and QRPA Table 1. The ratios of E 1 4+ and E 1 2+ , level numbers for daughter nuclei, level density and deviation between calculations and experiment.…”