Elsevier

Nuclear Physics A

Volume 221, Issue 3, 25 March 1974, Pages 555-563
Nuclear Physics A

Static moments of the first excited states of 32, 34S and 204, 206Pb

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Abstract

The reorientation effect in Coulomb excitation has been used to measure the following static quadrupole moments: Q2 + (32S) = −0.066 ± 0.017 b, Q2 + (34S) = 0.026 ± 0.023 b, Q2 + (204Pb) = 0.19 ± 0.14 b. Interference effects from higher excited states have been included in the analysis, with the signs of the E2 matrix elements taken from an anharmonic model. The value obtained for Q2 + (32S) is in disagreement with two previous measurements. We attribute the discrepancy to the smaller internucleon separation distances involved in the previous experiments, which can cause deviations from Coulomb excitation cross sections. The other quadrupole moments have not been measured previously. The B (E2: 0+ → 2+) measured were: 0.0305 ± 0.0016 e2 · b2(32S), 0.025 ± 0.004 e2 · b2(34S), and 0.166 ± 0.009 e2 · b2(204Pb). From the angular distribution of the de-excitation γ-rays of the Pb nuclei following recoil into vacuum, we have determined the following g-factors: ¦g2 + (204Pb)¦ < 0.08 (two standard deviations), ¦g2 + (206Pb)¦ = 0.07+ 0.07− 0.03. Our value of g2 + (206Pb) is in agreement with a previous measurement.

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  • Cited by (0)

    National Research Council of Canada Postdoctoral Fellow. Present address: University of Victoria, Victoria, BC.

    Canada Council Postdoctoral Fellow. Present address: University of Erlangen-Nunberg, W. Germany.

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