Elsevier

Nuclear Physics A

Volume 586, Issue 2, 10 April 1995, Pages 219-239
Nuclear Physics A

Laser-spectroscopy measurements of 72–96Kr spins, moments and charge radii

https://doi.org/10.1016/0375-9474(94)00786-MGet rights and content

Abstract

The spins, moments and radii of krypton isotopes have been investigated by collinear fast-beam laser spectroscopy in combination with ultra-sensitive collisional ionization detection. The sequence of isotopes under study ranges from the neutron-deficient N = Z = 36 isotope 72Kr to the neutron-rich 96Kr (N = 60). The mean-square charge radii in the neighbourhood of the N = 50 neutron-shell closure exhibit a pronounced shell effect which has recently been explained in the framework of relativistic mean-field theory. The results for the neutron-deficient nuclei are related to the shape coexistence of strongly prolate and near-spherical states which is known from nuclear spectroscopy. Here, an inversion of the odd-even staggering is observed below the neutron number N = 45. The neutron-rich transitional nuclei are influenced by the N = 56 subshell closure. In contrast to the N = 60 isotones 97Rb, 98Sr and 100Zr, the new isotope 96Kr is not strongly deformed.

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    1

    Present address: Heraeus Noblelight GmbH, Hanau, Germany.

    2

    Present address: Agfa Gevaert AG, Leverkusen, Germany.

    3

    Present address: Laboratorium voor Vaste-Stoffysika en Magnetisme, K.U. Leuven, B-3001 Leuven, Belgium.

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