In the doubly odd 63 150 Eu87 nucleus a 45 ns 8+ isomer at 589 keV excitation has been identified through (p, 3n) in beam ande – measurements. The low lying negative parity levels populated in its decay show great similarity to analogous states in the lighter odd-odd Eu neighbours suggesting a spherical shape for150Eu. A spherical shape is also proposed for the isomer which is assigned as (h 11/2 vf 7 2/–3 )8+ state analogous to the 9+ isomers known in148Eu and146Eu. The spin change is attributed to the crossing of the half-filledf 7/2 neutron shell atN=86.
A 45 ns 8+ isomer in the doubly odd150Eu nucleus
SORAMEL, FRANCESCA;
1983
Abstract
In the doubly odd 63 150 Eu87 nucleus a 45 ns 8+ isomer at 589 keV excitation has been identified through (p, 3n) in beam ande – measurements. The low lying negative parity levels populated in its decay show great similarity to analogous states in the lighter odd-odd Eu neighbours suggesting a spherical shape for150Eu. A spherical shape is also proposed for the isomer which is assigned as (h 11/2 vf 7 2/–3 )8+ state analogous to the 9+ isomers known in148Eu and146Eu. The spin change is attributed to the crossing of the half-filledf 7/2 neutron shell atN=86.
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