Differential cross section and polarization for 2.63 MeV neutrons scattered from 12C

doi:10.1016/0375-9474(73)90415-6

Nuclear Physics A

Volume 217, Issue 3, 31 December 1973, Pages 611-627

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Abstract

The differential cross section and polarization of 2.63 MeV neutrons scattered from ¹²C have been measured at eight angles between 17° and 118° in the laboratory system. By simultaneously fitting the cross section and polarization data, a set of scattering phase shifts was obtained. The values of the resulting d-wave phase shifts were larger than those of other existing sets of phase shifts in the energy region. A subsequent R-function analysis, reflecting these larger d-wave phase shifts, gave excellent fits to other experimental data below 3 MeV neutron energy region. The influence of narrow states at 7.50 and 7.55 MeV excitation energy in ¹³C is discussed.

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Neutron multiple scattering corrections including extensive realistic simulations of inherent experimental conditions
1984, Nuclear Instruments and Methods In Physics Research
An improved and more realistic method for the correction of neutron time-of-flight measurements for the effects of multiple scattering and finite geometry has been developed. Several important inherent experimental conditions, which are often neglected or treated very approximately in previous techniques, are more rigorously included in the present calculation. In particular, in the study of elastic and inelastic scattering of neutrons from samples of light nuclei in the form of chemical compounds, the energy spectrum of the neutron source, the time spreads of the source and detector and finite sizes of the source and detector often lead to sizeable corrections.
For each detector position, the computer program calculates time-of-flight spectra which agree well with those measured during the experiment. The calculated “measured” differential cross sections are also compared to the actual measured ones in a straightforward manner. Several examples demonstrating the importance of the above effects on the calculated time-of-flight spectra and differential cross sections are given.
The proper simulation of all the important experimental parameters makes possible the confident measurement of new differential cross sections for cases such as deep inelastic scattering, where the cross sections are usually small and the multiple scattering corrections related to the above effects are relatively large. Without such a method, certain important measurements might well not be performed, because of the uncertainty regarding proper corrections caused by these added effects.
Structure of 13C from an R-matrix analysis of 12C + n scattering and reaction cross sections
1982, Nuclear Physics, Section A
Differential cross sections for ¹²C + n elastic and inelastic scattering and for the ²C(n, α) ⁹Be reaction, together with high resolution total cross-section data were analyzed by means of a multilevel multichannel R-matrix program to determineJ, π, and γ_λc for states in ¹³C up to E_x = 13.5MeV. Good overall fits to the data were obtained throughout this large energy range. Spin and parity assignments for thirteen states above E_x = 9.5MeV for which there had been either no previous J^π assignments or only tentative assignments have been made in this study. The present results are in good agreement with previous analyses and model calculations.
Neutron scattering cross sections of carbon below 2 MeV recommended from R-matrix fits to data
1978, Atomic Data and Nuclear Data Tables
Cross-section and polarization data for neutron interaction with carbon below the inelastic threshold (4.81 MeV) were evaluated and analyzed by R-matrix theory. Six sets of total crosssection data below 2 MeV were partially smoothed and least-square fitted with non-diagonal weighting to obtain averages with estimated uncertainties for use in the R-matrix search program. The resulting differential scattering cross sections below 2 MeV are recommended as standards. The good quality of the fits well above 2 MeV and a high-precision (0.1%) thermal value enhance the confidence in the recommended values below 2 MeV.
The polarization of neutrons from the 2H(d, n)3He reaction for deuteron energies from 35 to 275 keV
1977, Nuclear Physics, Section A
The dependence on deuteron energy of the polarization of the neutrons emitted at 45° from the ²H(d, n)³He reaction in the range 35 to 275 keV, was determined from the asymmetry in the scattering of the neutrons by ⁴He. There is no indication of the much discussed possible resonance at about 100 keV deuteron energy. The results are discussed in relation to the general theoretical treatment of the ²H-²H interaction put forward by Boersma.
The analyzing power A<inf>y</inf>[(θ) for 12C(n, n<inf>0,1</inf>)12C between 8.9 and] 14.9 MeV neutron energy
1983, Nuclear Physics, Section A
The analyzing power A_y(θ) for ¹²C(n,n)¹²C elastic scattering and for inelastic scattering to the first excited state (J^π = 2⁺, Q = −4.44 MeV) of ¹²C was measured in the energy range from 8.9 to 14.9 MeV in 1 MeV steps. A pulsed polarized neutron beam was produced via the su2rmH( $d$ , $n$ )³He polarization transfer reaction. Monte Carlo simulations were used to correct the data for finite geometry and multiple scattering effects. The A_y data, together with published crosssection data, were analyzed in the framework of the spherical optical model and in the coupled-channels formalism. A good description of the data has been achieved.
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^☆: Supported in part by the National Science Foundation and US Atomic Energy Commission.

^††: Present address: Cyclotron Laboratory, Texas A & M University College Station, Texas.

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Nuclear Physics A

Abstract

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Cited by (8)

Neutron multiple scattering corrections including extensive realistic simulations of inherent experimental conditions

Structure of <sup>13</sup>C from an R-matrix analysis of <sup>12</sup>C + n scattering and reaction cross sections

Neutron scattering cross sections of carbon below 2 MeV recommended from R-matrix fits to data

The polarization of neutrons from the <sup>2</sup>H(d, n)<sup>3</sup>He reaction for deuteron energies from 35 to 275 keV

The analyzing power A<inf>y</inf>[(θ) for <sup>12</sup>C(n, n<inf>0,1</inf>)<sup>12</sup>C between 8.9 and] 14.9 MeV neutron energy

Cross section measurements of neutron elastic and inelastic scattering on Fe 54

Differential cross section and polarization for 2.63 MeV neutrons scattered from 12C☆

Abstract

Ann. of Phys.

Nucl. Instr.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Rev. Mod. Phys.

Nucl. Phys.

Phys. Rev.

Phys. Rev.

Evaluated cross sections for carbon from 0–5 MeV

Knolls Atomic Power Laboratory Report KAPL-M-7192

Helv. Phys. Acta.

Phys. Rev.

Nucl. Phys.

Differential cross section and polarization for 2.63 MeV neutrons scattered from ¹²C☆