Isomerism inPr148and the low-lying levels ofNd

Beta-decay of148,150,152Pr into levels of148,150,152Nd

“…In addition to I=0 for the 916.9 and 1645.7 keV levels spins for the levels at 752.6 (I=4), 999.7 (1=3), 1023.2 (I=1), 1171.2 (1=2), 1249.0 (1=2), and 2073.6 keV (I = 2) are obtained, supporting previous preliminary assignments [2][3][4][5][6][7]24]. In four additional cases (see Table 2), an unambiguous assignment cannot be made, but there remain only two possible values except for the level at 2182.1 keV.…”

“…In all measurements with sources from the a35U(n~,, f) reaction, including the present ones, the intensities for the 451 and 615 keV v-rays are about 5% and 4%, but 20% and 2%, respectively, in sources from the i48Nd(n, p)-reaction. This has led [5][6][7] to the postulation of a 2.02-min high-spin isomer (I~=4-) of 148pr. This isomer is not populated in the ft--decay of 148Ce and its direct production in the 235U(nth , f)-reaction is small, with an isomeric yield ratio of 0.14 [6].…”

Rotational Bands and Electromagnetic Transitions of Some Even–even Neodymium Nuclei in Projected Hartree–fock Model

“…The nucleus 148 Nd exhibits a low-lying negative parity band with 3 − state lying below 1 − in an early beta decay experiment by Walters et al [37] and later it was extended by Ibbotson et al [38]. Our band mixing (by mixing B2, B3 and B4 as given in Table III for 148 Nd) calculation reasonably reproduces the spectrum of this band with 3 − state lower in energy than 1 − state as in experiment.…”