Elsevier

Nuclear Physics A

Volume 127, Issue 1, 8 April 1969, Pages 33-46
Nuclear Physics A

Energy levels of 243Am

https://doi.org/10.1016/0375-9474(69)90764-7Get rights and content

Abstract

The energy levels of 243Am have been investigated by studying the γ-rays and conversion electrons of 243Pu and α groups of 247Bk by highre-solution semiconductor detectors. Some new γ-rays were identified and the multipolarities of the 381.7 and 356.4 keV transitions were measured to be M1. The half-life of the 84.0 keV level was measured by a delayed β-γ-ray coincidence technique and found to be 2.34±0.07 ns. Nine α groups belonging to 247Bk decay were identified and the favoured transition was found to populate a level at 267 keV above the ground state. The Nilsson-state assignments to the 243Am levels agree with the previous assignments. Coriolis interaction calculations were performed to explain the contraction of the 52+ (642↑) band and the branching ratios of the intensities of the γ-rays de-exciting the 72+(633↑) band to the rotational members of the 52+(642↑) band. The calculated values of the level spacings the γ-ray intensity ratios and α intensity ratios were found to be in good agreement with the respective observed quantities.

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    Work performed under the auspices of the U.S. Atomic Energy Commission.

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