Summary
The γ-rays from140Nd-140Pr mixture have been studied in a scintillation spectrometer. The new γ-rays of energies (900 ±20), (1600±30) and (2500 ±50) keV have been detected and their intensities in comparision to the 511 keV annihilation radiation are (0.15±0.05)%, (0.50±0.10)% and (0.02±0.01)% respectively. The branching ratio from the decay of140Pr to the ground state, 1 600 keV state and 2500 keV state of140Ce have been estimated, from the photon intensities, to be 99%, ∼1% and ∼0.2% respectively giving the value of log ft∼5 for all these branches. An assignment of 1+ for140Pr is suggested.
Riassunto
I raggi γ provenienti da una miscela di140Nd-140Pr sono stati studiati in uno spettrometro a scintillazione. Sono stati individuali nuovi raggi γ di energia (900 ±20), (1600±30) e (2500±50) keV e le lwo intensità confrontate alla radiazione di annichilazione di 511 keV sono (0.15±0.05)%, (0.50±0.10)% e (0.02+7.01)% rispettivamente. Dalle intensità dei fotoni si è valutato che il rapporto di branching per il decadimento del140Pr allo stato base, allo stato a 1600 keV ed allo stato a 2500 keV del140Ce, =è 99%, ∼1% e ∼ 0.2%rispettivamente, cle danno il valore di logft ∼ 5 per tutte queste ramificazioni. Si suggerisce di assegnare 1 al140Pr.
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Jha, S., Gupta, R.K. & Devare, H.G. On the gamma rays emitted in the decay of 14059 Pr. Nuovo Cim 16, 829–833 (1960). https://doi.org/10.1007/BF02771702
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DOI: https://doi.org/10.1007/BF02771702