K{sup -} absorption at rest in nuclei followed by p{Lambda} emission

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.034608· OSTI ID:21419540

Pandejee, Grishma Mehta; Upadhyay, N J; Jain, B K ^[1]

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1. Department of Physics, University of Mumbai, Vidyanagari, Mumbai - 400 098 (India)

p{Lambda} emission in coincidence following K{sup -} absorption at rest in nuclei is studied using quantum-mechanical scattering theory and nuclear wave functions. K{sup -} absorption is assumed to occur on two protons in the nucleus. In the formalism, emphasis is put on the study of the final state interaction (FSI) effects of p and {Lambda} with the recoiling nucleus. We include elastic scattering and single-nucleon knock-out (KO) channels in the FSI. Calculations are presented for the {sup 12}C nucleus, using shell-model wave functions, and without any extra mass modification of the K{sup -}pp system in the nucleus. Calculated results are presented for the angular correlation distribution between p and {Lambda}, their invariant mass distribution, and the momentum spectra of p and {Lambda}. These results are compared with the corresponding experimental measurements of M. Agnello et al., [Phys. Rev. Lett. 94, 212303 (2005)]. With only elastic scattering FSI included, the angular correlation distribution and the momentum spectra are found to be in good accord with the corresponding measurements. With full FSI, the calculated p{Lambda} invariant mass distribution is found to have two peaks, one corresponding to the elastic scattering FSI and another to single-nucleon KO FSI. The KO peak agrees fully, in position and shape, with the peak observed by M. Agnello et al. The peak corresponding to elastic scattering FSI does not seem to exist in the measured distribution. Considering that such a two-peak structure is always seen in the inclusive (p,p{sup '}) and (e,e{sup '}) reactions in nuclei at intermediate energies, absence of the elastic scattering peak in the p{Lambda} reaction is intriguing.

• OSTI ID: 21419540
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 82, Issue 3; Other Information: DOI: 10.1103/PhysRevC.82.034608; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ABSORPTION
ANGULAR CORRELATION
CARBON 12
COMPUTERIZED SIMULATION
ELASTIC SCATTERING
ELECTRON REACTIONS
ELECTRONS
EMISSION
FINAL-STATE INTERACTIONS
KAONS MINUS
KNOCK-OUT REACTIONS
MASS
MASS DISTRIBUTION
PROTON REACTIONS
PROTONS
QUANTUM MECHANICS
SHELL MODELS
SPECTRA
WAVE FUNCTIONS
BARYON REACTIONS
BARYONS
BOSONS
CARBON ISOTOPES
CHARGED-PARTICLE REACTIONS
CORRELATIONS
DIRECT REACTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
FERMIONS
FUNCTIONS
HADRON REACTIONS
HADRONS
INTERACTIONS
ISOTOPES
KAONS
LEPTON REACTIONS
LEPTONS
LIGHT NUCLEI
MATHEMATICAL MODELS
MECHANICS
MESONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
PSEUDOSCALAR MESONS
SCATTERING
SIMULATION
SORPTION
SPATIAL DISTRIBUTION
STABLE ISOTOPES
STRANGE MESONS
STRANGE PARTICLES