Weak nuclear interactions in neon-21 and neon-18

Thesis/Dissertation · Thu Jan 01 00:00:00 EST 1981

DOI:https://doi.org/10.2172/5699955· OSTI ID:5699955

Von Lintig, Richard David ^[1]

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1. Univ. of Washington, Seattle, WA (United States)

The results of two experiments involving weak meson exchange among nucleons are reviewed. Measurements are described of the circular polarization of 2.789 MeV gamma rays associated with the 2.789/2.796 MeV parity mixed doublet in ²¹Ne. Also reported are measurements of the 0⁺ - 0^- beta decay from ¹⁸Ne to the 1.081 MeV 0^- state of ¹⁸F, itself part of a spin-zero doublet of considerable interest for parity mixing. The significance of the results to the theory of weak non-leptonic interactions is examined. An argument is repeated that more careful interpretation of the results in terms of the fundamental weak interaction is needed. The circular polarization of the 2.789 MeV radiation from ²¹Ne is (20 +- 26) x 10^-4, a small result in view of the enhancement of this effect due to narrow doublet separation and the forbidden character of the transition. Simultaneous measurements of the circular polarization of 2.439 MeV radiation, which should not exhibit the parity violating effect even if the 1/2^- (2.789 MeV) state contains a significant parity impurity, indicate an absence of bias in the measurements. The relative probability of the 0⁺ - 0^- (1.081 MeV) decay from ¹⁸Ne is (2.26 ± .37) x 10^-4. The two-body (or meson exchange) contribution to this transition is the isospin analog of parity mixing between the 1042-keV (J^π;T = 0⁺;1) and 1081-keV (J^π;T = 0^-;0) states of ¹⁸F. The theoretical relation which has been shown to exist between these two weak interaction phenomena is recounted, so that the importance of the beta-decay measurement to non-leptonic weak interaction physics can be appreciated.

• Research Organization: Univ. of Washington, Seattle, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC06-76ER01388
• OSTI ID: 5699955
• Report Number(s): DOE/ER/01388-514; ON: DE82011085; TRN: 82-007628
• Resource Relation: Other Information: Thesis
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
NEON 21
MULTIPOLE TRANSITIONS
FLUORINE 18
NEON 18
BETA-PLUS DECAY
BARYON REACTIONS
BASIC INTERACTIONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
DECAY
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FLUORINE ISOTOPES
HADRON REACTIONS
HOURS LIVING RADIOISOTOPES
INTERACTIONS
INVARIANCE PRINCIPLES
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
NEON ISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
ODD-ODD NUCLEI
PARTICLE MODELS
PARTICLE PROPERTIES
PERIPHERAL MODELS
POTENTIALS
RADIOISOTOPES
SCATTERING
SECONDS LIVING RADIOISOTOPES
SPECTRA
STABLE ISOTOPES
TARGETS
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