Summary
Gamma transitions between low-lying levels of143Pm populated in the decay of143Sm have been investigated by means of lithiumdrifted germanium detectors. Gamma-rays of 273, 1056, 1173, 1243, 1403, 1516, 1545 keV have been detected; logft values, levels and spins of143Pm have been deduced from intensity ratios and coincidence measurements. Evidence for the existence of a 273 keV level which is the 7/2+ predicted by the pairing plus quadrupole force theory of Kisslinger and Sorensen comes out particularly strong from the analysis of143Nd(p, nγ)143Pm reaction data.
Riassunto
Utilizzando rivelatori al germanio sono state studiate le transizioni gamma tra i livelli del143Pm ottenuti dal decadimento del143Sm. Sono stati rivelati raggi gamma di energie 273, 1056, 1173, 1243, 1403, 1516, 1545 keV; dai rapporti di intensità e dalle misure di coincidenza sono stati ricavati i valori del logft, e i livelli con i relativi spin del143Pm. L’esistenza di un livello a 273 keV, corrispondente al livello 7/2+ predetto dalla teoria di Kisslinger e Sorensen è confermata dall’analisi dei dati della reazione143Nd(p, nγ)143Sm.
Реэюме
С помошью литиево-германиевых детекторов были исследованы гамма-переходы между ниэколежашими уровнями143Pm, эаселенными при рас-паде143Sm. Были дарегистрированы гамма-лучи 273, 1056, 1173, 1243, 1403, 1516, 1545 КзВ; иэ отнощений интенсивностей и иэмерений совпадений были выведены величины lg ft, уровни и спины143Pm. Иэ аналиэа данных реакции143 Nd(p, nγ)143Pm особенно ярко выступает подтверждение сушествования уровня 273 КзВ, который представляет 7/2+ , предскаэанный посредством теории спаривания плюс квадрупо-льной силы, раэвитой Кисслинджером и Соренсеном.
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This work has been supported by the EURATOM-CNEN contract for fundamental research in nuclear physics.
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Blasi, P., Sona, P., Taccetti, N. et al. Low-lying levels in143Pm. Nuovo Cimento B (1965-1970) 58, 453–459 (1968). https://doi.org/10.1007/BF02711999
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DOI: https://doi.org/10.1007/BF02711999