Energy levels in143Pr
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The decay of143Ce to levels in143Pr has been studied using a Ge(Li) and a Na(Tl)−Ge(Li) coincidence spectrometers. Singles gamma-ray spectrum as well as gamma-gamma coincidence and directional angular correlation measurements were carried out to determine gamma transitions, multipolarities, mixing ratios and level spins and parities. Ten new transitions and 26 previously known transitions were observed having energies up to 1340 keV.
An energy level scheme has been constructed for143Pr composed of 12 previously established levels together with two new levels at 890 keV (5/2+) and 1314 keV (3/5−, 5/2−). Angular correlation measurements together with log ft values led to assign spins and parities for the levels 350 keV (3/2−) 721.8 keV (5/2+), 890 keV (5/2+) and 937.3 keV (3/2+, 5/2+)
KeywordsProbable Spin Decay Scheme Coincidence Spectrum Energy Level Scheme Chance Coincidence
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