Search for short lived axions emitted from neutron capture on protons

Conference · Wed Jan 01 00:00:00 EST 1986

OSTI ID:7010266

Freedman, S J; Arnold, M; Doehner, J; Last, J; Dubbers, D

A search has been conducted for light neutral particles like the axions which decay rapidly to electron positron pairs produced in the reaction n + p ..-->.. D + a. Instead the e/sup +/e/sup -/ signal expected from direct internal pair conversion has been detected. A preliminary analysis gives (GAMMA/sub p//GAMMA/sub ..gamma../)/sub expt//(GAMMA/sub p//GAMMA/sub ..gamma../)/sub theo/ = 1.06 +- 0.12. The results exclude existing axion models over the mass range 2 m/sub e/ < m/sub a/ < 2.22 MeV/c/sup 2/. The axion mass would fall in this range if they were responsible for the narrow positron lines observed in recent heavy-ion experiments at the GSI.

• Research Organization: Argonne National Lab., IL (USA); Heidelberg Univ. (Germany, F.R.). Physikalisches Inst.; Institut Laue-Langevin, 38 - Grenoble (France)
• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 7010266
• Report Number(s): CONF-860741-18; ON: DE87001498
• Resource Relation: Conference: International symposium on weak and electromagnetic interactions in nuclei, Heidelberg, F.R. Germany, 1 Jul 1986
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AXIONS
EMISSION
NEUTRON REACTIONS
CAPTURE
PROTONS
BRANCHING RATIO
CP INVARIANCE
ELECTRONS
ENERGY SPECTRA
HEAVY ION REACTIONS
MASS
POSITRONS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BARYON REACTIONS
BARYONS
BOSONS
CHARGED-PARTICLE REACTIONS
ELEMENTARY PARTICLES
FERMIONS
GOLDSTONE BOSONS
HADRON REACTIONS
HADRONS
INVARIANCE PRINCIPLES
LEPTONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
POSTULATED PARTICLES
SPECTRA
645300* - High Energy Physics- Particle Invariance Principles &amp; Symmetries
651225 - Nuclear Properties &amp; Reactions
A=1-5
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