Abstract
New β-delayed proton precursor142Ho was produced via heavy ion induced reaction106Cd(40Ca, p3n), and identified for the first time by using a He-jet fast tape transport system in combination with “p-γ” coincidence measurements. The β-delayed proton decay of142Ho was observed and its half life was determined to be (0.4±0.1) s. By fitting the experimental relative branching ratios to final states in the proton daughter nucleus141Tb and the energy spectrum of β-delayed protons with a statistical model calculation, the ground-state spin of142Ho was assigned as 5, 6 or 7. Nuclear energy-potential-surface (EPS) calculations were performed using the Woods-Saxon Strutinsky method. The calculated results favored the assignments of 7− to142Ho. As the by-products, some γ-transitions in the proton daughter nuclei following the β-delayed proton decays of precursors139Gd,140Tb,142Tb, and143Dy were reported here for the first time.
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