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Title of Journal: Nuov Cim A

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Abbravation: Il Nuovo Cimento A (1965-1970)

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Società Italiana di Fisica

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1826-9869

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Doppler shift attenuation measurements onSuperscr

Authors: P Banerjee B Sethi J M Chatterjee P Bhattacharya A K Sengupta
Publish Date: 2008/05/10
Volume: 85, Issue: 1, Pages: 54-66
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Abstract

Lifetime measurements by the Doppler shift attenuation method for levels in the nuclei57Fe and57Co populated via the reactions55Mnα pnγ57Fe and55Mnα 2nγ57Co respectively are reported The relative γray intensities and the branching ratios for levels in the two nuclei are also presented In57Fe mean lifetime values of τ=020±009 ps and 026±010 ps are obtained for the levels at 10070 keV and 13568 keV respectively for which no lifetime information existed previously and values of τ=008±003 054 −015 +030 and 016±006 ps are determined for the levels at 23557 32691 and 61856 keV respectively for which only the limits of lifetimes were reported earlier For the 24552 keV level in57Fe a lower limit of 2 ps is obtained for its mean life In57Co lifetimes of eight levels withJπ≤19−/2 have been measured and compared with the earlier reported values The results of lifetime measurements and reduced transition probabilities for both the nuclei are discussed and compared with the available shell model calculationsSi riportano le misure di vita media mediante il metodo di attenuazione dello spostamento Doppler per livelli nei nuclei57Fe e57Co popolati mediante le reazioni55Mnα pnγ57Fe e55Mnα 2nγ57Co rispettivamente Si presentano anche le intensità relative dei raggi γ e i rapporti di diramazione nei due nuclei Per57Fe si ottengono i valori di vita media di τ=020±009 ps e 026±010 ps per i livelli a 10070 keV e 13568 keV rispettivamente per i quali non esistevano precedentemente informazioni sulla vita media e si determinano i valori di τ=008±003 054 −015 +030 e 016±006 ps per i livelli a 23557 32691 e 61856 keV rispettivamente per i quali si erano stati riportati precedentemente solo i limiti di vita media Per il livello a 24552 keV nel57Fe si ottiene per la sua vita media un limite inferiore di 2 ps Nel57Co le vite medie degli otto livelli conJπ≤19−/2 sono state misurate e confrontate con valori riportati precedentemente Si discutono i risultati delle misure di vita media e le probabilità di transizione ridotte per entrambi i nuclei e si confrontano con i calcoli disponibili del modello a strati

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