Electromagnetic transitions between the low-lying levels of /sup 21/Ne and their relation to parity mixing of the 2. 80-MeV 1/2/sup + -/ doublet

Journal Article · Sun Oct 01 04:00:00 EDT 1978 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.18.1878· OSTI ID:6636754

Millener, D J; Warburton, E K; Snover, K A; von Lintig, R; Ikossi, P G

The presence of a J/sup ..pi../ = 1/2/sup +/-1/2/sup -/ doublet (..delta..E approx. = 8 keV) at 2.80 MeV in /sup 21/Ne provides an opportunity to further investigate parity mixing of nuclear states. The parity mixing in /sup 21/Ne introduces an irregular M1, E2 admixture into the regular, but highly retarded, E1, M2 decay of the 1/2/sup -/ level to the 3/2/sup +/ ground state and can be inferred from the interference between these irregular and regular decays. We consider the dependence of possible /sup 21/Ne parity-mixing observables on the four electromagnetic matrix elements involved in the transition and also methods for determining these matrix elements. The first step towards a measurement of the M2/E1 mixing ratio is a measurement of the E2/M2 mixing ratio of the 1/2/sup -/ ..-->.. 5/2/sup +/ transition in /sup 21/Ne and this is carried out using a ..gamma..-..gamma.. correlation utilizing the /sup 18/O(..cap alpha..,n) /sup 21/Ne reaction. A large basis SU(3) shell-model calculation is performed to give wave functions for /sup 21/Ne (and /sup 21/Na) and predictions for the electromagnetic matrix elements relevent to studies of the 1/2/sup + -/ parity-mixing. The parity-mixing matrix element is calculated using a one-body approximation to the parity nonconserving interaction. The calculated matrix elements are compared with the available experimental data on /sup 21/Ne and /sup 21/Na.

• Research Organization: Brookhaven National Laboratory, Upton, New York 11973
• OSTI ID: 6636754
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 18:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651413* -- Nuclear Properties & Reactions
A=20-38
Theoretical-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
ALPHA REACTIONS
ANGULAR CORRELATION
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
CORRELATIONS
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
FUNCTIONS
GAMMA SPECTRA
ISOTOPES
LIE GROUPS
LIGHT NUCLEI
MATHEMATICAL MODELS
MATRIX ELEMENTS
MIXING RATIO
NEON 21
NEON ISOTOPES
NEUTRON SPECTRA
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
ODD-EVEN NUCLEI
OXYGEN 18 TARGET
PARITY
PARTICLE PROPERTIES
POLARIZATION
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SHELL MODELS
SODIUM 21
SODIUM ISOTOPES
SPECTRA
STABLE ISOTOPES
SU GROUPS
SU-3 GROUPS
SYMMETRY GROUPS
TARGETS
WAVE FUNCTIONS