0000000000246703
AUTHOR
M. Kohno
K+Λ photoproduction amplitudes incorporating absorptive effects and hypernuclear formation
Incorporating final-state absorptive effects, we have reexamined the γp→K+Λ elementary process to obtain amplitudes which are used for describing photoproduction of hypernuclei. Our model not only resolves the persisting trouble of the small KNΛ coupling constant, but also yields agreement with cross-section data at higher energies. Using our amplitudes, we calculate angular distributions for the reaction16O(γ, K+)Λ16N. While the forward cross-section increases with increasing energy, the total cross-section is found to remain almost constant fromEγ=1.2 GeV through 2 GeV, which suggests that rather low photon energies hold promise for exploration of hypernuclear excitations.
Absorptive effects inK+Λphotoproduction on nucleons and nuclei
Incorporating final state correlation effects, we have reinvestigated the ..gamma.. /sup 1/H..-->..K/sup +/..lambda.. elementary process. Our model not only resolves the persisting trouble of the small KN..lambda.. coupling constant, but also yields agreement with cross section data at higher energies. Using our amplitudes, we calculate angular distributions for the reaction /sup 16/O(..gamma..,K/sup +/)/sub ..lambda..//sup 16/N . While the forward cross section increases with increasing energy, the total cross section is almost constant from E/sub ..gamma../ = 1.2 GeV through 2 GeV, suggesting that rather low photon energies hold promise for exploration of hypernuclear excitations.