Shape coexistence, evolution and the parallel proton-neutron core breaking in 15568Er87 studied with the help of the BaF2 4π-detection system

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Abstract

A discrete γ-ray study of 155Er has been performed. A level scheme up to spin 85/2 has been established and interpreted using the deformed Woods-Saxon cranking approximation, taking into account pairing forces. Interpretation in terms of shape coexistence, band termination and breaking of the (Z=64, N=82) core is proposed.

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1

Permanent address: USTHB, Dar El-Beïda, Algiers, Algeria.

4

Work supported by the US Department of Energy under contract No. W-31-109-Enj-38.

2

Permanent address: TRIUMF, 4004 Wesbrook Mall, Vancouver, Canada V6T 2A3.

3

Permanent address: II. Physikalisches Institut, Universität Giessen, D-6300 Giessen, Fed. Rep. Germany.

5

Permanent address: Institute of Technology, PL-00-662 Warsaw, Poland.

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