Abstract
Gamma radiation and delayed neutrons following the decay of 44.9 ms /sup 29/Na have been studied in singles and coincidence mode with mass-separated sources. Evidence for a first excited state in /sup 29/Mg at 54.6 keV has been found, in good agreement with theoretical predictions. From the lifetime, tau = 1.83 +- 0.10 ns, deduced from ..gamma..-..gamma.. delayed coincidences with BaF/sub 2/ counters, a transition strength B(M1) = 0.11 Weisskopf units is found for the 55 keV (1/2/sup +/)..-->..g.s. ((3/2/sup +/) transition. A level scheme built on the new state at 55 keV and involving five new transitions has been established for bound levels in /sup 29/Mg. The features of these levels are compared with predictions of shell-model calculations, with which they substantially agree. In the neutron time-of-flight spectra, high-energy neutron branches have been found in addition to the previously reported decays. The observed distribution of the Gamow-Teller transition strengths with excitation energy for particle-unbound levels in /sup 29/Mg is found to be shifted upward by about 1 MeV relative to shell-model predictions.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
