Elsevier

Nuclear Physics A

Volume 426, Issue 2, 17 September 1984, Pages 379-398
Nuclear Physics A

Spectroscopy of high-spin states in 217Ra

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Abstract

The high-spin level structure of 217Ra has been established up to a spin of (472) by means of in-beam γ-ray and conversion electron spectroscopy with (12,13C, xn) reactions on 208Pb. Positive parity levels up to case272+ and negative-parity states up to (case312) can be qualitatively understood in terms of neutron excitations arising out of the shell-model configurations vg392, vg292i112and vg292 j152. The isomeric 332+ state at 2.4 Me V and the levels above it require both neutron and proton excitations. The El transitions between the negative-parity and the vg392 states suggest the presence of octupole-deformed configurations. Our shell-model calculations provide only a qualitative description of the levels. The experimental level spacings and their moderate agreement with the calculated ones suggest also the onset of deformation and of collective vibrational characteristics.

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    Present address : Lawrence Livermore National Laboratory, Nuclear Chemistry Division.

    ∗∗

    On leave of absence from Inst. of Nucl. Phys., Krakow, Poland.

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