Authors: M Bentaleb N Schulz E Lubkiewicz J L Durell C J Pearson W R Phillips J Shannon B J Varley I Ahmad C J Lister L R Morss K L Nash C W Williams
Publish Date: 2014/03/25
Volume: 354, Issue: 2, Pages: 143-151
Abstract
A search for octupole deformation in neutronrich Xe isotopes has been conducted through prompt gammaray spectroscopy of secondary fragments produced in the spontaneous fission of248Cm The spectrometer consisted of the Eurogam 1 array and a set of 5 LEPS detectors Level schemes were constructed for Xe isotopes with mass number ranging from 140 to 144 and excited states for143144Xe nuclei were observed for the first time None of the level schemes exhibit an alternating parity quasimolecular band a feature usually expected in nuclei in which octupole correlation effects are strong enough to produce stable octupole deformation For several isotopes structures observed in the level schemes are consistent with an octupole softness of the nucleiEurogam is funded jointly by IN2P3 France and the SERC UK This work was partly supported by the Science and Engineering Research Coucil of the UK under grant No GRH71161 by the IN2P3 — Polish Laboratories collaboration agreement and by the US Department of Energy under contract No W31109ENG38
Keywords: