Electromagnetic production of. sigma. hypernuclei

Journal Article · Mon May 01 04:00:00 EDT 1989 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.39.1944· OSTI ID:6065899

Bennhold, C

The formation of sigmas through low-energy kaon photoproduction from nucleons is described by using Feynman diagrams. Different models for the production process are compared, including pseudovector versus pseudoscalar coupling for the KN..sigma.. vertex. The elementary coupling constants are fitted to the cross-section data up to 2.2 GeV and agree with previous fits obtained from the photoproduction of lambdas from protons. This operator is then implanted into the nucleus via the impulse approximation. Using Woods-Saxon shell-model wave functions for the sigma and the nucleon and a particle-hole basis for the nucleus, angular distributions are obtained for the formation of /sub <1//sub ..sigma..//sup 6/N, /sub <4//sub ..sigma..//sup 0/K, and /sub <20//sub ..sigma..//sup 8/Tl. Cross sections for processes employing the reaction /sup 1/H(..gamma..,K/sup +/)..sigma../sup 0/ are about one fifth of those corresponding to lambda hypernuclei, while reactions involving n(..gamma..,K/sup +/)..sigma../sup -/ yield counting rates comparable to those of lambda-hypernuclear photoproduction.

• Research Organization: Institut fuer Kernphysik, Johannes Gutenberg-Universitaet, 6500 Mainz, Federal Republic of Germany
• OSTI ID: 6065899
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 39:5; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

653001* -- Nuclear Theory-- Nuclear Structure
Moments
Spin
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653003 -- Nuclear Theory-- Nuclear Reactions &amp; Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
ANGULAR DISTRIBUTION
BARYONS
BASIC INTERACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BOSONS
CROSS SECTIONS
DIAGRAMS
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ELECTROMAGNETIC INTERACTIONS
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FEYNMAN DIAGRAM
GEV RANGE
GEV RANGE 01-10
HADRONS
HEAVY NUCLEI
HYDROGEN 1 TARGET
HYPERNUCLEI
HYPERONS
IMPULSE APPROXIMATION
INTERACTIONS
ISOTOPES
KAONS
KAONS PLUS
LAMBDA BARYONS
LAMBDA PARTICLES
LIGHT NUCLEI
MATHEMATICAL MODELS
MESONS
MINUTES LIVING RADIOISOTOPES
NITROGEN 16
NITROGEN ISOTOPES
NUCLEAR FRAGMENTS
NUCLEAR MODELS
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUCLEI
ODD-ODD NUCLEI
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE-HOLE MODEL
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTONUCLEAR REACTIONS
PHOTOPRODUCTION
POTASSIUM 40
POTASSIUM ISOTOPES
POTENTIALS
PSEUDOSCALAR MESONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SHELL MODELS
SIGMA BARYONS
SIGMA NEUTRAL PARTICLES
SIGMA PARTICLES
STRANGE MESONS
STRANGE PARTICLES
TARGETS
THALLIUM 208
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