sup 4 He(. pi. ,. pi. prime p ) sup 3 H reaction: Quasifree and resonance scattering

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Physical Review, C (Nuclear Physics); (USA)

OSTI ID:6477413

Jones, M K; Dehnhard, D; Nanda, S K; Sterbenz, S M ^[1]; Morris, C L; Plum, M ^[2]; Zumbro, J D ^[3]; Hussein, A ^[4]; Oakley, D S; Smithson, M J; Williams, A L; McDonald, J; Bryan, M A; Fuentes, A H; Lynker, M; Crockett, D; Machuca, M A; Mordechai, S; Moore, C F ^[5]

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1. University of Minnesota, Minneapolis, MN (USA)
2. Los Alamos National Laboratory, Los Alamos, NM (USA)
3. University of Pennsylvania, Philadelphia, PA (USA) Los Alamos National Laboratory, Los Alamos, NM (USA)
4. King Fahd University of Petroleum and Minerals, Dhahran (Saudi Arabia)
5. University of Texas at Austin, Austin, TX (USA)

Exclusive {sup 4}He({pi}{sup {plus minus}},{pi}{sup {plus minus}}{prime}{ital p}){sup 3}H spectra in the excitation energy range between 21.5 and 44 MeV in {sup 4}He were measured at {ital T}{sub {pi}}=180 MeV at several pion and proton angles. The cross section ratio {ital R}{sub {pi}{ital p}}={sigma}({pi}{sup +},{pi}{sup +}{prime}{ital p})/{sigma}({pi}{sup {minus}},{pi}{sup {minus}}{prime}{ital p}) was found to be between 1 and 2 near 22 MeV which is in the region of the {ital J}{sup {pi}}=2{sup {minus}}, {ital T}=0 state. Between 25 and 40 MeV in the continuum, which comprises the giant dipole resonance and broad 2{sup {minus}} and 2{sup +} states, {ital R}{sub {pi}{ital p}} ranges from 0.22 to 45 in sharp contrast to the predicted values of {approx}1 from a model assuming the entire yield is due to the sequential decay of a state of good isospin, and 6 to 9 from a distorted-wave impulse approximation calculation assuming quasifree proton knockout.

• OSTI ID: 6477413
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 42:3; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651220* -- Nuclear Properties & Reactions
A=1-5
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIRECT REACTIONS
DISTORTED WAVE THEORY
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
FERMIONS
GIANT RESONANCE
HADRON REACTIONS
HADRONS
HELIUM 4 TARGET
HYDROGEN ISOTOPES
IMPULSE APPROXIMATION
INELASTIC SCATTERING
ISOTOPES
KNOCK-OUT REACTIONS
LAMPF LINAC
LIGHT NUCLEI
LINEAR ACCELERATORS
MESON FACTORIES
MESON REACTIONS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
PION MINUS REACTIONS
PION PLUS REACTIONS
PION REACTIONS
PROTONS
RADIOISOTOPES
RESONANCE
RESONANCE SCATTERING
SCATTERING
SPIN
TARGETS
TRITIUM
YEARS LIVING RADIOISOTOPES