Gamow-Teller beta decay of /sup 29/Na and comparison with shell-model predictions

Journal Article · Sat Aug 01 04:00:00 EDT 1987 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.36.765· OSTI ID:6347041

Baumann, P; Dessagne, P; Huck, A; Klotz, G; Knipper, A; Marguier, G; Miehe, C; Ramdane, M; Richard-Serre, C; Walter, G; others, and

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.

• Research Organization: Centre de Recherches Nucleaires, 67037 Strasbourg, France and the Isolde Collaboration, CERN, 1211 Geneva 23, Switzerld the
• OSTI ID: 6347041
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 36:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651420* -- Nuclear Properties & Reactions
A=20-38
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
ALKALINE EARTH ISOTOPES
ANGULAR MOMENTUM
BARYONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY
BETA-MINUS DECAY RADIOISOTOPES
COINCIDENCE SPECTROMETRY
DECAY
DELAYED NEUTRONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY SPECTRA
EVEN-ODD NUCLEI
FERMIONS
FISSION NEUTRONS
FUNCTIONS
GAMMA RADIATION
GAMOW-TELLER RULES
HADRONS
HAMILTONIANS
IONIZING RADIATIONS
ISOTOPES
LIFETIME
LIGHT NUCLEI
MAGNESIUM 29
MAGNESIUM ISOTOPES
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
MILLISEC LIVING RADIOISOTOPES
NEUTRONS
NUCLEAR MODELS
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
QUANTUM OPERATORS
RADIATIONS
RADIOISOTOPES
SHELL MODELS
SODIUM 29
SODIUM ISOTOPES
SPECTRA
SPIN
STRENGTH FUNCTIONS
TIME-OF-FLIGHT METHOD