Measurement of the longitudinal spin-dependent neutron-proton total cross-section difference [Delta][sigma][sub [ital L]]([ital np]) between 500 and 800 MeV

Journal Article · Fri Jul 01 00:00:00 EDT 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.50.104· OSTI ID:7233362

Beddo, M; Burleson, G; Faucett, J A; Gardiner, S; Kyle, G ^[1]; Garnett, R; Grosnick, D; Hill, D; Johnson, K; Lopiano, D; Ohashi, Y; Shima, T; Spinka, H; Stanek, R; Underwood, D; Yokosawa, A ^[2]; Glass, G; Kenefick, R; Nath, S; Northcliffe, L ^[3] ; Jarmer, J J; Penttilae, S ^[4]; Jeppesen, R ^[5]; Tripard, G ^[6]; Devereux, M ^[7]; Kroll, P ^[8]

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1. New Mexico State University, Las Cruces, New Mexico 88003 (United States)
2. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
3. Texas A M University, College Station, Texas 77843 (United States)
4. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
5. University of Montana, Missoula, Montana 59812 (United States)
6. Washington State University, Pullman, Washington 99164 (United States)
7. Earlham College, Richmond, Indiana 47374 and Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
8. University of Wuppertal (Germany)

A measurement of [Delta][sigma][sub [ital L]]([ital np]), the difference between neutron-proton total cross sections for pure longitudinal spin states, is described. Data were taken at LAMPF for five neutron beam kinetic energies: 484, 568, 634, 720, and 788 MeV. The statistical errors are in the range of 0.64--1.35 mb. Various sources of systematic effects were investigated and are described. Overall systematic errors are estimated to be on the order of 0.5 mb and include an estimate for the uncertainty in the neutron beam polarization. The [Delta][sigma][sub [ital L]] results are consistent with previous results from PSI and Saclay. These data, when combined with other results and fitted to a Breit-Wigner curve, are consistent with an elastic [ital I]=0 resonance with mass 2214[plus minus]15 (stat) [plus minus]6 (syst) MeV and width 75[plus minus]21[plus minus]12 MeV. Because of a lack of [Delta][sigma][sub [ital T]]([ital np]) data between 500 and 800 MeV, it is not possible to differentiate between a singlet or coupled-triplet partial wave being responsible.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38; AS05-76ER04449; AS04-76ER03591; FG05-88ER40399
• OSTI ID: 7233362
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 50:1; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
PROTON-NEUTRON INTERACTIONS
TOTAL CROSS SECTIONS
ERRORS
KINETIC ENERGY
MEV RANGE 100-1000
NEUTRON BEAMS
PARTIAL WAVES
POLARIZED BEAMS
SPIN
ANGULAR MOMENTUM
BARYON-BARYON INTERACTIONS
BEAMS
CROSS SECTIONS
ENERGY
ENERGY RANGE
HADRON-HADRON INTERACTIONS
INTERACTIONS
MEV RANGE
NUCLEON BEAMS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE BEAMS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PROTON-NUCLEON INTERACTIONS
662340* - Hadron Interactions- (1992-)
663300 - Nuclear Reactions & Scattering
General- (1992-)
662410 - Properties of Baryons & Baryon Resonances- (1992-)