Experimental beta-decay energies of very neutron-rich Cs isotopes

Abstract

Abstract:The QB-values of the very neutron-rich cesium isotopes with mass number 142 ~ A ~ 146 have been measured with a plastic scintillation detector telescope at the fission product separator OSTIS. The mass excesses calculated from these decay energies agree well with the values obtained by direct mass determinations.

Experimental study of145Cs Decay

“…The values of the 145Cs ground state ~-branch, fldelayed neutron branch, the reported Q/~ of 7,960 +80keY [10], and the 7-ray and internal conversion electron intensity balances resulting from the proposed decay scheme were used to calculate logft values for the fl-transitions shown in Fig. 4.…”

“…Several of the N = 89 isotones were extensively studied [1][2][3][4]. The measurement of 14SCs beta decay energy has also been reported [10]. The experimental study of ~47Ce, which is obtainable only through fi-decay, is not detailed [6], and to date no theoretical investigation has been reported.…”

Beta-decay energies and nuclear masses of very neutron-rich Rb and Cs isotopes

“…For both mess chains, the results of these investigations agree only for the isotopes with low masses (A<93 in the case of rubidium and A<143 in the case of cesium); for the heavier isotopes, the mass excesses deduced from Q~-values often disagree from * Supported in part by Bundesministerium fiir Forschung und Technologie (BMFT) those obtained in the direct mass determination far outside the given error. This discrepancy has already been discussed shortly in two notes [8,9]. In the present paper, the details of new measurements will be given, which have been performed in order to reduce the experimental errors, to explain the discrepancies mentioned, and to search for the existence of isomerism in the heavy odd-odd Rb nuclei which has been suggested recently by several authors [-7, 10, 11].…”