Hypernuclear excitation through kaon photoproduction

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

DOI:https://doi.org/10.1103/PhysRevC.28.1668· OSTI ID:5665710

Hsiao, S S; Cotanch, S R

The ..lambda.. hypernuclear spectrum excited in the weakly interacting electromagnetic production process A(..gamma..,K/sup +/)/sub ..lambda../B is theoretically surveyed. Plane wave impulse approximated multiple-scattering calculations for hypernuclear formation from /sup 4/He, /sup 12/C, and /sup 208/Pb targets are presented for a wide range of lab and excitation energies. Excitation energies and transition densities are calculated within a lambda-particle, proton-hole model using Woods-Saxon basis wave functions. The transition operator is constructed using the free (bare) amplitudes for the elementary process ..gamma..+p..-->..K/sup +/+..lambda.. which are evaluated from Feynman diagrams including both strange meson (K,K() and baryon (..lambda..,..sigma..) exchange. These amplitudes are dominated by ..lambda.. and scalar K exchange; however, effects from ..sigma.. and vector K( exchange are found to be significant even near threshold. The hypernuclear selective excitation is documented in detail for theta = 0/sup 0/. Transitions to unnatural parity states and substitutional states with medium to high spin are predicted to be strong. Because of large momentum transfer (> or =200 MeV/c), the (..gamma..,K) reaction is highly quasielastic and a low, roughly 0.1, ..lambda.. ''sticking probability'' is estimated using an approximate hypernuclear sum rule. The excitation process is sensitive to the interior as cross section calculations for /sup 208/Pb(..gamma..,K/sup +/)/sup 208//sub ..lambda../Tl involving bound ..lambda.. 1s, 2s, and 3s configurations, unrestricted by the Pauli exclusion principle, reveal markedly different signatures.

• Research Organization: Department of Physics, North Carolina State University, Raleigh, North Carolina 27650
• OSTI ID: 5665710
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 28:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
BASIC INTERACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BORON 12
BORON ISOTOPES
BOSONS
CARBON 12 TARGET
CROSS SECTIONS
DIAGRAMS
ELECTROMAGNETIC INTERACTIONS
ELECTROPRODUCTION
ELEMENTARY PARTICLES
ENERGY LEVELS
EQUATIONS
FERMIONS
FEYNMAN DIAGRAM
FUNCTIONS
HADRONS
HEAVY NUCLEI
HELIUM 4 TARGET
HYDROGEN 4
HYDROGEN ISOTOPES
HYPERNUCLEI
HYPERONS
IMPULSE APPROXIMATION
INTERACTIONS
ISOTOPES
KAONS
KAONS PLUS
LAMBDA PARTICLES
LEAD 208 TARGET
LIGHT NUCLEI
MESONS
MINUTES LIVING RADIOISOTOPES
MULTIPLE SCATTERING
NUCLEAR FRAGMENTS
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUCLEI
ODD-ODD NUCLEI
PARITY
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PAULI PRINCIPLE
PHOTONUCLEAR REACTIONS
PHOTOPRODUCTION
POTENTIALS
PSEUDOSCALAR MESONS
RADIOISOTOPES
SCATTERING
SECONDS LIVING RADIOISOTOPES
STRANGE PARTICLES
SUM RULES
TARGETS
THALLIUM 208
THALLIUM ISOTOPES
WAVE FUNCTIONS
WOODS-SAXON POTENTIAL