Study of optical model parameters for high energy neutron cross sections from 5 to 50 MeV in the mass-140 region

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A study of the neutron optical potential on nuclei near mass-140 was begun to extend the energy range and improve the precision of previous neutron total cross section measurements. The extended energy range of this measurement reveals maxima and minima in the total cross section that are evidence of the nuclear Ramsauer effect. A 100-MeV linear accelerator is used to produce a continuum of neutron energies from a Ta-Be conversion target. A 250-meter flight path is used to measure neutron energies by the time-of-flight method. Transmission data for /sup 140/Ce and transmission ratios for /sup 142/Ce, /sup 141/Pr, and /sup … continued below

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13 pages

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Phillips, T.W.; Camarda, H.S. & White, R.M. May 8, 1980.

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  • Lawrence Livermore Laboratory
    Publisher Info: California Univ., Livermore (USA). Lawrence Livermore Lab.
    Place of Publication: Livermore, California

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A study of the neutron optical potential on nuclei near mass-140 was begun to extend the energy range and improve the precision of previous neutron total cross section measurements. The extended energy range of this measurement reveals maxima and minima in the total cross section that are evidence of the nuclear Ramsauer effect. A 100-MeV linear accelerator is used to produce a continuum of neutron energies from a Ta-Be conversion target. A 250-meter flight path is used to measure neutron energies by the time-of-flight method. Transmission data for /sup 140/Ce and transmission ratios for /sup 142/Ce, /sup 141/Pr, and /sup 139/La relative to /sup 140/Ce were obtained. The /sup 140/Ce data have a precision of 1 to 3% and the ratios are obtained with a precision of about 0.3%. To analyze these total cross section data a computer code was developed to calculate the total elastic, reaction, and differential elastic scattering cross sections for a neutron interacting with a nucleus. The interaction is represented by a spherically symmetric complex potential that includes spin-orbit coupling. The parameters of this potential were adjusted to approximate the /sup 140/Ce total cross over the energy range from 2.5 to 60 MeV. The energy dependence of these parameters is described. 5 figures, 1 table.

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13 pages

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NTIS, PC A02/MF A01.

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  • Symposium on neutron cross sections from 10 - 50 MeV, Upton, NY, USA, 12 May 1980

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  • Report No.: UCRL-84344
  • Report No.: CONF-800551-2
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 5293901
  • Archival Resource Key: ark:/67531/metadc1065160

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Office of Scientific & Technical Information Technical Reports

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  • May 8, 1980

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  • Feb. 4, 2018, 10:51 a.m.

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  • June 28, 2019, 12:42 p.m.

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Phillips, T.W.; Camarda, H.S. & White, R.M. Study of optical model parameters for high energy neutron cross sections from 5 to 50 MeV in the mass-140 region, article, May 8, 1980; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc1065160/: accessed June 8, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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