Decay ofLa136andLa

Abstract

Sources of 9.87-min 136 La and 6.82-min 134 La were made by the (p,n) reaction on enriched 136 Ba and 134 Ba. A 20-cc Ge(Li) detector was used to observe the y rays emitted by these sources. The energies in keV (with relative intensities in parentheses) of y rays emitted in the decay of 136

Two quasi-particle levels in136Ba and the decay of136Cs

“…The two new levels seen in this work are those at 2356.6 and 2373.7 keV. For discussions of the other levels, we refer thy reader to previous works on this nucleus [2][3][4][5][6][7]. The 2374-keV level decays by four gamma rays rays with a total intensity of 0.21, which gives a log-ft value of 8.0 for beta decay to this level.…”

“…They detected three weak gamma transitions'not seen in the NaI work of Reising and Pate and could only assign two of these transitions as connecting known levels in ~36Ba. Levels of 136Ba populated in the decay of a36La have been studied by Meyer and Griffioen [5] and others [6]. Further information about the levels of ~36Ba is in the unpublished (d, p) and (d, d') work of Morrison et al [7] and in the neutron capture gamma-ray work of Gelletly et al [8].…”

Levels and transitions in136Ba

“…Gamma-gamma directional correlations are performed in an attempt to determine the characteristics of these levels, and in order to determine mixing ratios. The lifetime of the 2207.5 keV state is remeasured, and the lifetime of the 2140.5 keV state is measured for the first time.The level scheme of larBa has been investigated in the beta decay of 136Cs [1][2][3][4][5][6][7][8] and electron capture of la6La [10,11], and in neutron capture [12][13][14][15] and inelastic scattering [16]. The nucleus la6Ba may be regarded as transitional in the sense that the low-lying excitations have been described in terms of a quasi-rotational band [17], and as phonon states [11].…”