Decay of Neutron-Rich Mn Nuclides and Deformation of Heavy Fe Isotopes
Abstract
The use of chemically selective laser ionization combined with β-delayed neutron counting at CERN/ISOLDE has permitted identification and half-life measurements for 623-ms 61Mn up through 14-ms 69Mn. The measured half-lives are found to be significantly longer near N = 40 than the values calculated with a quasiparticle random-phase-approximation shell model. Gamma-ray singles and coincidence spectroscopy has been performed for 64,66Mn decays to levels of 64,66Fe, 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.
- Publication:
-
Physical Review Letters
- Pub Date:
- February 1999
- DOI:
- 10.1103/PhysRevLett.82.1391
- arXiv:
- arXiv:nucl-ex/9812008
- Bibcode:
- 1999PhRvL..82.1391H
- Keywords:
-
- Nuclear Experiment
- E-Print:
- Latex-file with 4 figures, 5 pages, Phys. Rev. Lett., in print