Quasifree knockout of charged particles from sup 4 He with 100 MeV protons

Journal Article · Sun Jul 01 00:00:00 EDT 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.42.309· OSTI ID:6414766

Whittal, D M; Cowley, A A; Pilcher, J V; Foertsch, S V; Smit, F D; Lawrie, J J ^[1]

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1. National Accelerator Centre, Faure (South Africa)

Exclusive measurements have been made of {sup 4}He({ital p},2{ital p}), ({ital p},{ital pd}), ({ital p},{ital pt}), and ({ital p},{ital ph}) at 100 MeV. The primary protons were measured at two angles, 45{degree} and 60{degree}, in coincidence with secondary protons, deuterons, tritons, or helions covering a wide range of angles on the opposite side of the beam, from {minus}15{degree} to {minus}90{degree} in plane, and from 0{degree} to 30{degree} out of plane. The satisfactory agreement in shape between the measured energy-sharing distributions and results of distorted-wave impulse approximation calculations suggests that this formalism is adequate for modeling the quasifree knockout reactions induced by 100 MeV protons on {sup 4}He. It is found that (70{plus minus}10)% of the inclusive continuum yields in {sup 4}He({ital p},{ital p}{prime}) is attributable to quasifree scattering, with {similar to}30% arising from multiple scattering. At low energies of the scattered proton, the knockout of nucleons constitutes over 90% of the quasifree component, whereas at high energies the knockout of deuterons, tritons, and helions dominates the yield. Consequently the cluster knockout contributions fill in the yield at higher energies in the inclusive spectra, and quasifree peaks are not discernible.

• OSTI ID: 6414766
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 42:1; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651220* -- Nuclear Properties & Reactions
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653003 -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BARYON REACTIONS
BARYONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CLUSTER MODEL
COINCIDENCE SPECTROMETRY
CROSS SECTIONS
DEUTERONS
DIRECT REACTIONS
DISTORTED WAVE THEORY
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRON REACTIONS
HADRONS
HELIUM 4 TARGET
IMPULSE APPROXIMATION
INCLUSIVE INTERACTIONS
INTERACTIONS
KNOCK-OUT REACTIONS
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MULTIPLE SCATTERING
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PROTON REACTIONS
PROTONS
QUASI-FREE REACTIONS
RECOILS
SCATTERING
SPECTROSCOPIC FACTORS
TARGETS
TRITONS