Elsevier

Nuclear Physics A

Volume 462, Issue 2, 26 January 1987, Pages 305-332
Nuclear Physics A

The N-dependence of Cd mean square charge radii (54 ⩽ N ⩽72) and the nuclear moments of 103Cd

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Abstract

The isotope shift of the radioactive Cd isotopes 102Cd, 103Cd, 104Cd, 105Cd, 107Cd, 111Cd, 113Cd, 115Cd, 117Cd, 118Cd, 119Cd, 120Cd and the hyperfine structure Splitting of 103Cd are determined in the CdI 5s2 1S0-5s5p 3P1, λ = 326.1 nm line by fluorescence laser spectroscopy using a pulsed laser system and frequency doubling. The unstable Cd isotopes are produced at the ISOLDE mass separator at CERN and are investigated on-line in a resonance vessel.

Changes of mean square charge radii are derived from the isotope shift data. The curve of the radii as a function of the mass number, shows on top of the regular A13 expansion a collective contribution of parabolic shape which peaks at N = 66 in the middle of the shell. This contribution is considerably stronger than calculated from the B(E2+1) values solely. Isotonic and isobaric shifts between Z = 37 and Z = 56 are obtained in a combined analysis of isotope shifts (δr2〉), muonic 〈r2〉 values and B(E2+1) values. The shifts agree with the predictions of the droplet model showing the buildup of a neutron skin along isobaric chains.

The nuclear moments of 103Cd have been determined as μI, = −0.81(3)μn and Qs = −0.79(66)b.

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  • Cited by (0)

    1

    Present address : Foster Radiation Laboratory, McGill University Montréal, Québec, Canada H3A 2B2.

    2

    Present address : Technische Universität, D-2000 Hamburg-Harburg.

    3

    Present address: CERN, Div. EP, CH-1211 Geneva 23, Switzerland.

    4

    Present address: GANIL, 14021 Caen, BP 5027, France.

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