Beta decays of /sup 18/Ne and /sup 19/Ne and their relation to parity mixing in /sup 18/F and /sup 19/F

Journal Article · Wed Jun 01 04:00:00 EDT 1983 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.27.2833· OSTI ID:6044057

Adelberger, E G; Hindi, M M; Hoyle, C D; Swanson, H E; Von Lintig, A R.D.; Haxton, W C

We have studied transitions weakly fed in the ..beta../sup +/ decays of /sup 18/Ne and /sup 19/Ne. The /sup 18/Ne activity was produced by bombarding natural O/sub 2/ gas with 12.0 MeV /sup 3/He ions. ..gamma..-ray groups with energies of 659, 1042, 1081, and 1700 keV were observed with relative intensities of 1.72 +- 0.05, 100.0, (2.89 +- 0.26) x 10/sup -2/, and 0.687 +- 0.013, respectively. These intensities correspond to relative branching ratios of 100.0, (2.70 +- 0.36) x 10/sup -2/, and 2.45 +- 0.05 for ..beta../sup +/ transitions to the 1042, 1081, and 1700 keV levels, respectively. Normalizing to previous data we obtain ft values of 1247 +- 11, 2971 +- 87, (1.03 +- 0.14) x 10/sup 7/, and (3.00 +- 0.10) x 10/sup 4/ sec for the transitions to the ground state, 1042, 1081, and 1700 keV levels, respectively. The difference in excitation energies of the 0/sup -/ and 0/sup +/ states is found to be 39.20 +- 0.11 keV. The /sup 19/Ne activity was produced by bombarding SF/sub 6/ gas by 6.4 MeV protons. A branching ratio of (1.20 +- 0.20) x 10/sup -4/ was obtained for the transition to the 110 keV level which corresponds to an ft value of (1.15 +- 0.19) x 10/sup 7/ sec. Transitions to the 1554 keV level were observed in a 9.2% Ge(Li) detector operated in the singles mode. A branching ratio of (2.34 +- 0.30) x 10/sup -5/ was obtained which corresponds to an ft value of (5.01 +- 0.47) x 10/sup 5/ sec. The /sup 18/Ne(0/sup +/;1)..-->.. /sup 18/F(1081 keV 0/sup -/;0) and /sup 19/Ne(1/2/sup +/; 1/2)..-->../sup 19/F (110 keV 1/2/sup -/; 1/2) first-forbidden ..beta../sup +/ branches are analogs of the previously measured parity mixing of the 1042 keV (0/sup +/;1) and 1081 (0/sup -/;1) keV levels of /sup 18/F and of the ground ((1/2)/sup +/;(1/2)) and 110 keV ((1/2)/sup -/;(1/2)) levels of /sup 19/F, respectively.

• Research Organization: Nuclear Physics Laboratory GL-10, University of Washington, Seattle, Washington 98195
• OSTI ID: 6044057
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 27:6; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY
BETA-PLUS DECAY RADIOISOTOPES
DECAY
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FLUORINE 18
FLUORINE 19
FLUORINE ISOTOPES
FORBIDDEN TRANSITIONS
FT VALUE
HOURS LIVING RADIOISOTOPES
INVARIANCE PRINCIPLES
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MATRIX ELEMENTS
NEON 18
NEON 19
NEON ISOTOPES
NUCLEAR MODELS
NUCLEAR STRUCTURE
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
P INVARIANCE
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SHELL MODELS
STABLE ISOTOPES