47 research outputs found
Decay of neutron-rich Mn nuclides and deformation of heavy Fe isotopes
The use of chemically selective laser ionization combined with beta-delayed neutron counting at CERN/ISOLDE has permitted identification and half-life measurements for 623-ms Mn-61 up through 14-ms Mn-69. The measured half-lives are found to be significantly longer near N=40 than the values calculated with a QRPA shell model using ground-state deformations from the FRDM and ETFSI models. Gamma-ray singles and coincidence spectroscopy has been performed for Mn-64 and Mn-66 decays to levels of Fe-64 and Fe-66, revealing a significant drop in the energy of the first 2+ state in these nuclides that suggests an unanticipated increase in collectivity near N=40
Proton dripline studies at ISOLDE: Ar and C
In this contribution examples of the application of new technologies to disentangle the mechanism of -delayed multiparticle emission are given. In particular the mechanism of 2p-emission from Ar has been resolved and proved to be sequential, a preview of C-decay data is discussed
- decay of the M=-1 nucleus Zn studied by selective laser ionization
- decay of Zn has been studied for the first time. A new laser ion-source concept has been used to produce mass-separated sources for and - spectroscopy. The half-life of Zn was determined to be 86(18) ms. Comparisons are made with previous data from charge-exchange reactions. Our Gamow-Teller strength to the 1 state at 1051 keV excitation in Cu agrees well with the value extracted from a recent (He, t) study. Extensive shell-model calculations are presented