Measurement of the n-p elastic scattering angular distribution at E{sub n}=14.9 MeV

Journal Article · Thu Jul 15 00:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.014001· OSTI ID:21389170

Boukharouba, N ^[1]; Bateman, F B; Carlson, A D ^[2]; Brient, C E; Grimes, S M; Massey, T N ^[3]; Haight, R C ^[4]; Carter, D E ^[5]

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1. Department of Physics, University of Guelma, Guelma 24000 (Algeria)
2. National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
3. Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701 (United States)
4. Los Alamos Neutron Science Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
5. Institute of Nuclear and Particle Physics, Ohio University, Athens, Ohio 45701 (United States)

The relative differential cross section for the elastic scattering of neutrons by protons was measured at an incident neutron energy E{sub n}=14.9 MeV and for center-of-mass scattering angles ranging from about 60 deg. to 180 deg. Angular distribution values were obtained from the normalization of the integrated data to the n-p total elastic scattering cross section. Comparisons of the normalized data to the predictions of the Arndt et al. phase-shift analysis, those of the Nijmegen group, and with the ENDF/B-VII.0 evaluation are sensitive to the value of the total elastic scattering cross section used to normalize the data. The results of a fit to a first-order Legendre polynomial expansion are in good agreement in the backward scattering hemisphere with the predictions of the Arndt et al. phase-shift analysis, those of the Nijmegen group, and to a lesser extent, with the ENDF/B-VII.0 evaluation. A fit to a second-order expansion is in better agreement with the ENDF/B-VII.0 evaluation than with the other predictions, in particular when the total elastic scattering cross section given by Arndt et al. and the Nijmegen group is used to normalize the data. A Legendre polynomial fit to the existing n-p scattering data in the 14 MeV energy region, excluding the present measurement, showed that a best fit is obtained for a second-order expansion. Furthermore, the Kolmogorov-Smirnov test confirms the general agreement in the backward scattering hemisphere and shows that significant differences between the database and the predictions occur in the angular range between 60 deg. and 120 deg. and below 20 deg. Although there is good overall agreement in the backward scattering hemisphere, more precision small-angle scattering data and a better definition of the total elastic cross section are needed for an accurate determination of the shape and magnitude of the angular distribution.

• OSTI ID: 21389170
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 82, Issue 1; Other Information: DOI: 10.1103/PhysRevC.82.014001; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
CENTER-OF-MASS SYSTEM
COMPARATIVE EVALUATIONS
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
EXPANSION
FORECASTING
LEGENDRE POLYNOMIALS
MEV RANGE 10-100
NEUTRONS
NUCLEAR DATA COLLECTIONS
NUCLEON-NUCLEON INTERACTIONS
PHASE SHIFT
PROTONS
SMALL ANGLE SCATTERING
BARYON-BARYON INTERACTIONS
BARYONS
CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY RANGE
EVALUATION
FERMIONS
FUNCTIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MEV RANGE
NUCLEONS
PARTICLE INTERACTIONS
POLYNOMIALS
SCATTERING