Elsevier

Physics Letters B

Volume 476, Issues 3–4, 16 March 2000, Pages 213-218
Physics Letters B

The 8+ isomer in 78Zn and the doubly magic character of 78Ni

https://doi.org/10.1016/S0370-2693(00)00177-5Get rights and content

Abstract

A new isomeric state in 78Zn has been identified and studied in the fragmentation of a 60.5 AMeV 86Kr beam on a natNi target. The measured energies of the transitions and the half-life, T1/2=319(9) ns, of the isomeric decay suggest a spin and parity assignment Iπ=8+. The deduced B(E2,8+→ 6+) value equals 1.21(5) W.u. is well reproduced in large scale shell model calculations using realistic interactions in the proton-neutron 2p3/2, 1f5/2, 2p1/2, 1g9/2 model space. Standard E2 polarisation charges of 0.5e for both protons and neutrons were used. This result consists the first experimental evidence of the persistance of the N=50 shell gap in the vicinity of 7828Ni50.

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Acknowledgements

We are grateful to the technical support provided to us by staff of the GANIL facility. This work has been partially supported by the POLONIUM project N.98275, KBN grant N.2P03B03615, DOE contract DE-AC05-96OR22464, Alliance grant N.98029 between University of Surrey and GANIL and by EPSRC(UK).

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