Low temperature nuclear orientation of239Np in gadolinium host |
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Authors: | E. Šimečková P. Čižek M. Finger J. John P. Malinský V. N. Pavlov |
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Affiliation: | (1) Joint Institute for Nuclear Research, Dubna, Head Post Office Box 79, 101 000 Moscow, USSR;(2) Present address: Central Microtrone Lab., Technical University, Břehová 7, CS-115 19 Prague 1, Czechoslovakia |
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Abstract: | The angular distribution of γ-radiation from the decay of239Np oriented at low temperatures in gadolinium host was investigated. The orientation parameters B2 and B4 were determined. The attenuation factors for two long-living states in239Pu at 391.5 keV and 285.4 keV were calculated. From the anisotropies measured the multipole mixing ratios for 11 gamma-transitions in239Pu were deduced. The results obtained support the assignment of spins of the levels at 492.2 keV and 391.6 keV as 3/2− and 7/2−, respectively. |
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