C. Sotty on behalf of IS650/IS665 IDS, IFIN-HH, Univ. York, IKS Leuven collaborations
The decay chain was investigated through and -ray spectroscopy at CERN-ISOLDE. A radioactive beam of and was implanted on the ISOLDE Decay Station tape, where the -rays originating from the decay chains --- were registered using a mixed array consisting of (4 HPGe- 2 LaBr(Ce)–1 Beta) detectors arranged in close geometry. The production yields were measured for different experimental conditions of targets, also involving the formation of molecular beam inducing a substantial contamination.
Prior to our study, K.-L. Gippert et al. used the multinucleon transfer reaction to produce the precursor. Due to low statistics and the absence of - coincidences, only a few -ray transitions were associated with . In the present work, we report on revised and considerably extended level schemes for (24 new -rays, 19 new levels) and (67 new -rays, 36 new levels), revealing the existence of new structures lying at higher energy and a different -strength distribution. Thanks to our low -ray/X-ray energy capabilities, few - internal conversion coefficients have been newly extracted for , providing clues to assign multi-polarities to the related transitions. An isomeric state at keV, on top of which a newly discovered structure is build, was identified and measured in with HPGe detector array using the standard electronic timing technique.
The experimental results will be discussed and confronted to the systematics present neighbouring nuclei, where similar structures/mechanisms are observed.
