S. M. Grimes
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View article: Status update on the NIFFTE high precision fission cross section measurement program
Status update on the NIFFTE high precision fission cross section measurement program Open
The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) program has been underway for nearly two years. The program's mission is to measure fission cross sections of the primary fissionable and fissile materials ({sup 235}U, {sup…
View article: MEASUREMENTS OF THE H(N,N) ANGULAR DISTRIBUTION OF 10MEV NEUTRON ENERGY.
MEASUREMENTS OF THE H(N,N) ANGULAR DISTRIBUTION OF 10MEV NEUTRON ENERGY. Open
Relative measurements of the cross section for scattering of neutrons by protons have been made at 10 MeV neutron energy for center-of-mass neutron scattering angles from 60' to 180'. The measurements were made using the Ohio University Ac…
View article: Systematic Distortion Factor and Unrecognized Source of Uncertainties in Nuclear Data Measurements and Evaluations
Systematic Distortion Factor and Unrecognized Source of Uncertainties in Nuclear Data Measurements and Evaluations Open
Each experiment provides new information about the value of some physical quantity. However, not only measured values but also the uncertainties assigned to them are an important part of the results. The metrological guides provide recomme…
View article: Reduction of the neutron imaginary potential off the stability line and its possible impact on neutron capture rates
Reduction of the neutron imaginary potential off the stability line and its possible impact on neutron capture rates Open
The effect of the isovector imaginary optical potential has been studied experimentally by using the particle-evaporation technique for the 11B + 48Ca reaction with a 21.8 MeV 11B beam. Spectra of neutron, proton, and α particles emitted f…
View article: Did we solve the old contradiction between microscopic and macroscopic experimental PFNS data?
Did we solve the old contradiction between microscopic and macroscopic experimental PFNS data? Open
Prompt Fission Neutron Spectra (PFNS) were analysed in the "dimensionless scale". The important empirical facts were demonstrated. PFNS have the same shape for any isotopes and incident energy (<5MeV) for neutron induced and spontaneous fi…
View article: Level density rotational enhancement factor
Level density rotational enhancement factor Open
Bethe wrote a pivotal paper providing the formalism for the theory of nuclear level densities. At that time, there were no known deformed nuclei, so Bethe made the assumption that all nuclei are spherical. After deformed nuclei were discov…
View article: Investigation of Neutron Cross Section for Iron in the ENDF Library with Pulsed Sphere Measurements
Investigation of Neutron Cross Section for Iron in the ENDF Library with Pulsed Sphere Measurements Open
This work investigates the quality of the ENDF 56Fe cross-section libraries for describing the transport of fast neutrons in iron. We have used the D(d,n)3He reaction with a pulsed 7-MeV deuteron beam energy as a neutron source and analyze…
View article: Experimental $γ$-decay strength in $^{59, 60}$Ni compared with microscopic calculations
Experimental $γ$-decay strength in $^{59, 60}$Ni compared with microscopic calculations Open
Nuclear level densities and $γ$-ray strength functions have been extracted for $^{59, 60}\rm{Ni}$, using the Oslo method on data sets from the $^{60}$Ni($^{3}$He,$^{3}$He$^{\prime}γ$)$^{60}$Ni and $^{60}$Ni($^{3}$He,$αγ$)$^{59}$Ni reaction…
View article: Experimental $\gamma$-decay strength in $^{59, 60}$Ni compared with microscopic calculations
Experimental $\gamma$-decay strength in $^{59, 60}$Ni compared with microscopic calculations Open
Nuclear level densities and $\gamma$-ray strength functions have been extracted for $^{59, 60}\rm{Ni}$, using the Oslo method on data sets from the $^{60}$Ni($^{3}$He,$^{3}$He$^{\prime}\gamma$)$^{60}$Ni and $^{60}$Ni($^{3}$He,$\alpha\gamma…
View article: Estimation of d-<sup>2</sup>H Breakup Neutron Energy Distributions From d-<sup>3</sup>He
Estimation of d-<sup>2</sup>H Breakup Neutron Energy Distributions From d-<sup>3</sup>He Open
A method is described to estimate deuteron-on-deuteron breakup neutron distributions at 0° using deuterium bombardment of 3He. Break-up neutron distributions are modeled with the product of a Fermi-Dirac distribution and a cumulative logis…
View article: A high precision n-p scattering measurement at 14.9 MeV
A high precision n-p scattering measurement at 14.9 MeV Open
\nThe n-p scattering angular distribution was measured with 14.9 MeV incident neutrons using the traditional time-of-flight technique with neutron-gamma discrimination. The scattering angle varied from 20o to 65o (laboratory system) in 5o …
View article: Mass-number and excitation-energy dependence of the spin cutoff parameter
Mass-number and excitation-energy dependence of the spin cutoff parameter Open
Here, the spin cutoff parameter determining the nuclear level density spin distribution ρ(J) is defined through the spin projection as < J2z > 1/2 or equivalently for spherical nuclei, (< J(J+1) >/3)1/2. It is needed to divide the total le…
View article: The low-energy M1<i>γ</i>-strength from radiative proton capture experiment
The low-energy M1<i>γ</i>-strength from radiative proton capture experiment Open
The multipolarity of the low-energy (< 3 MeV) γ–strength function has been experimentally studied with the 55Mn(p,2γ)56Fe reaction at 1.65 MeV proton beam energy. The spectrum of two-step γ–cascades populating the ground state of 56Fe has …