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in subjects: "Iron 56 Target"

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Analysis of Fe(n,x{gamma}) cross sections using the TNG nuclear reaction model code

Theoretical gamma ray cross sections have been calculated using a nuclear reaction model code. These are compared to experimental gamma ray production cross sections obtained from neutron interactions with {sup 56}Fe at incident neutron energies of 1 to 40 MeV. The optical model and nuclear level density parameters in the code have been varied to affect a close agreement between calculations and the data. Present analyses, which focus on incident neutron energies between 17 and 40 MeV, display … more

Date: April 1993

Creator: McCollam, K. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Analysis of Fe(n,x[gamma]) cross sections using the TNG nuclear reaction model code

Theoretical gamma ray cross sections have been calculated using a nuclear reaction model code. These are compared to experimental gamma ray production cross sections obtained from neutron interactions with [sup 56]Fe at incident neutron energies of 1 to 40 MeV. The optical model and nuclear level density parameters in the code have been varied to affect a close agreement between calculations and the data. Present analyses, which focus on incident neutron energies between 17 and 40 MeV, display … more

Date: April 1, 1993

Creator: McCollam, K.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Angular distribution for /sup 56/Fe(. pi. /sup +/,. pi. /sup /minus//)/sup 56/Ni(DIAS)

We have measured a (..pi../sup +/,..pi../sup /minus//) angular distribution for the transition to the double isobaric analog state of a T = 2 target nucleus, /sup 56/Fe, at T/sub ..pi../ = 180 MeV. The data are compared to measurements on T = 1 targets and to theoretical predictions. The angular dependence is different from that observed in measurements on T = 1 targets. Some features of the data are reproduced by the theoretical predictions, but significant discrepancies remain. 15 refs., 3 fi… more

Date: January 1, 1989

Creator: Seidl, P. A.; Rai, G.; Gilman, R.; Morris, C. L.; Burleson, G. R.; Dhuga, Kalvir S. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Anomalous M-1 strengths and doorway states in neutron capture

Recent experiments concerning the anomalous ratio of M1 and E1 strengths in /sup 36/Cl and /sup 57/Fe are interpreted as strong evidence for doorway state reaction mechanisms in neutron capture. 2 tables.

Date: January 1, 1978

Creator: Peker, L K & Chrien, R E

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Assessment of some optical model potentials in predicting neutron cross sections

Optical model potential parameters play an important role in the evaluation of nuclear data for applied purposes. The IAEA Coordinated Research Program on {open_quotes}Reference Input Parameter Library for Evaluation of Nuclear Data for Application in Nuclear Technology{close_quotes} aims to release a reference input file of various types of parameters for the evaluation of nuclear cross sections using nuclear model codes. Included in the parameter files are a collection of optical model potent… more

Date: March 1, 1998

Creator: Kumar, A.; Young, P.G. & Chadwick, M.B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Calculation of neutron cross sections on iron between 3 and 40 MeV. [Hauser-Feshbach model]

The use of high energy d+Li sources to produce neutrons for radiation damage studies will require evaluated neutron cross sections up to energies of 40 MeV. Experimental data in this energy region are scarce, and reliance must be placed upon nuclear model calculations to provide the necessary cross sections. We have thus calculated neutron-induced cross sections on /sup 54/Fe and /sup 56/Fe between 3 and 40 MeV using the multistep preequilibrium Hauser-Feshbach model code GNASH. Special care wa… more

Date: January 1, 1979

Creator: Arthur, E. D. & Young, P. G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Calculation of neutron cross sections on iron up to 40 MeV

The development of high energy d + Li neutron sources for fusion materials radiation damage studies will require neutron cross sections up to 40 MeV. Experimental data above 15 MeV are generally sparse or nonexistent, and reliance must be placed upon nuclear-model calculations to produce the needed cross sections. To satisfy such requirements for the Fusion Materials Irradiation Test Facility (FMIT), neutron cross sections have been calculated for /sup 54/ /sup 56/Fe between 3 and 40 MeV. These… more

Date: January 1, 1980

Creator: Arthur, E. D. & Young, P. G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Capture in the 1. 15-keV iron resonance

The 1.15-keV resonance in iron is important to reactors in that a major part of the iron capture integral is due to this one resonance. This resonance is also a good test case for capture gamma-ray detectors, which are meant to have an efficiency independent of gamma-ray energy spectra, because this resonance has an unusually hard spectrum and other iron resonances do not. There have been severe discrepancies among different groups who have measured the capture area and transmission of this res… more

Date: January 1, 1985

Creator: Weston, L.W. & Todd, J.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Charged particles produced in neutron reactions on nuclei from beryllium to gold

Charged-particle production in reactions of neutrons with nuclei has been studied over the past several years with the spallation source of neutrons from 1 to 50 MeV at the Los Alamos Neutron Science Center (LANSCE). Target nuclides include 9Be, C, 27Al, Si, 56Fe, 59Co, 58,60Ni, 93Nb and 197Au. Proton, deuteron, triton, 3He and 4He emission spectra, angular distributions and production cross sections have been measured. Transitions from the compound nuclear reaction mechanism to precompound rea… more

Date: August 1, 1997

Creator: Haight, R. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Compilation and evaluation of 14-MeV neutron-activation cross sections for nuclear technology applications. Set I

Available 14-MeV experimental neutron activation cross sections are compiled and evaluated for the following reactions of interest for nuclear-energy technology applications: /sup 27/Al(n,p)/sup 27/Mg, Si(n,X)/sup 28/Al, Ti(n,X)/sup 46/Sc, Ti(n,X)/sup 47/Sc, Ti(n,X)/sup 48/Sc, /sup 51/V(n,p)/sup 51/Ti, /sup 51/V(n,..cap alpha..)/sup 48/Sc, Cr(n,X)/sup 52/V, /sup 55/Mn(n,..cap alpha..)/sup 52/V, /sup 55/Mn(n,2n)/sup 54/Mn, Fe(n,X)/sup 54/Mn, /sup 54/Fe(n,..cap alpha..)/sup 51/Cr, /sup 59/Co(n,p)… more

Date: April 1, 1985

Creator: Evain, B. P.; Smith, D. L. & Lucchese, P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Consistent nuclear model for compound and precompound reactions with conservation of angular momentum. [14. 6 MeV]

The exciton model is modified such that it automatically reduces to the usual evaporation formula after equilibrium has been reached. The result is further modified to conserve angular momentum in a form compatible with the Hauser-Feshbach formula. This approach allows a consistent description of intermediate excitations from which tertiary reaction cross sections can be calculated for transitions to discrete residual levels with known spins and parities. Level densities used for the compound c… more

Date: January 1, 1979

Creator: Fu, C.Y.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Cross sections for production of 70 discrete-energy gamma rays created by neutron interactions with sup 56 Fe for E sub n to 40 MeV: Tabulated data

Inelastic and nonelastic neutron interactions with {sup 56}Fe have been studied for incident neutron energies between 0.8 and 41 MeV. An iron sample isotopically enriched in the mass 56 isotope was used. Gamma rays representing 70 transitions among levels in residual nuclei were identified, and production cross sections were deduced. The reactions studied were {sup 56}Fe(n,n{prime}){sup 56}Fe, {sup 56}Fe(n,p){sup 56}Mn, {sup 56}Fe(n,2n){sup 55}Fe, {sup 56}Fe(n,d + n,np){sup 55}Mn, {sup 56}Fe(n,… more

Date: September 1, 1990

Creator: Dickens, J.K.; Todd, J.H. & Larson, D.C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A-dependence of nuclear transparency in quasielastic A(e,e{prime}p) at high Q{sup 2}

The A-dependence of the quasielastic A(e,e{prime}p) reaction has been studied with {sup 3}H, C, Fe, and Au nuclei at momentum transfers Q{sup 2} = 1, 3, 5, and 6.8(GeV/c){sup 2}. The authors extract the nuclear transparency T(A,Q{sup 2}), a measure of the average probability of escape of a proton from a nucleus A. Several calculations predict a significant increase in T with momentum transfer, a phenomenon known as color transparency. No statistically significant rise is seen for any of the nuc… more

Date: May 1, 1994

Creator: O`Neill, T.G.; Lorenzon, W. & Arrington, J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Evaluation of neutron cross sections to 40 MeV for /sup 54/ /sup 56/Fe

Cross sections for neutron-induced reactions on /sup 54/ /sup 56/Fe were calculated by employing several nuclear models: optical, Hauser-Feshbach, preequilibrium and DWBA - in the energy range between 3 and 40 MeV. As a prelude to the calculations, the necessary input parameters were determined or verified through analysis of a large body of experimental data for both neutron- and proton-induced reactions in this mass and energy region. This technique also led to cross sections in which the sim… more

Date: January 1, 1980

Creator: Arthur, E. D. & Young, P. G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Evaluation of resonance parameters for neutron interaction with iron isotopes for energies up to 400 keV

The evaluation of the resolved resonance parameters of iron isotopes 54, 56, and 57 in the neutron energy region below 400 keV is documented. Estimates of the uncertainties in the resonance parameters and correlation between the partial widths GAMMA/sub n/ and GAMMA/sub ..gamma../ are given when significant. Some details about the procedures used to evaluate the resonance parameters, their uncertainties, and correlations are reported. This evaluation was performed for the general-purpose file o… more

Date: September 1, 1980

Creator: Perey, C.M. & Perey, F.G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

(Evaluations of neutron reactions with sup 52 Cr, sup 56 Fe, sup 58 Ni)

The traveler organized and chaired the meeting of the NEANDC/NEACRP Nuclear Data Evaluation Cooperation Subgroup-I: Intercomparison of USA, European, and Japanese Evaluations for {sup 52}Cr, {sup 56}Fe, and {sup 58}Ni, held on December 3, 1990, at the NEA Data Bank in Saclay, France. The traveler held discussions with Subgroup-II members to keep track of the activities of this group in which the traveler is a member. Highlights and/or recommendations of these meetings, as well as observations o… more

Date: December 21, 1990

Creator: Fu, C.Y.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Experimental and calculated excitation functions for discrete-line gamma-ray production due to 1-40 MeV neutron interactions with sup 56 Fe

Measuring cross sections for gamma-ray production from tertiary reactions is one of the ways to gain experimental information about these reactions. To this end, inelastic and other nonelastic neutron interactions with {sup 56}Fe have been studied for incident neutron energies between 0.8 and 41 MeV. An iron sample isotopically enriched in the mass 56 isotope was used. Gamma rays representing 70 transitions among levels in residual nuclei were identified, and production cross sections were dedu… more

Date: January 1, 1991

Creator: Dickens, J.K.; Fu, C.Y.; Hetrick, D.M.; Larson, D.C. & Todd, J.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Experimental results of neutron fluence outside an iron shield in the forward direction

Analyses of both lateral shielding measurements and Monte Carlo calculations for beam stop geometry for incident hadrons at energies between 10 GeV and 10 TeV suggests that the dose equivalent can be represented by the expression H = H{sub 0}(E)e{sup -r/{lambda}}/r{sup 2} where H, is the source term, r is the radial distance to the point of interest in the shield, and {lambda} is the effective interaction length, or absorption mean free path. However, unlike the lateral shielding case, there is… more

Date: September 1, 1996

Creator: Torres, M.M.C.; Elwyn, A.J.; Fein, D.; James, E.; Johns, K.; Davis, W. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

High resolution inelastic gamma-ray measurements with a white neutron source from 1 to 200 MeV

Measurements of prompt gamma rays following neutron-induced reactions have recently been made at the spallation neutron source at the WNR target area of LAMPF using germanium detectors. These experiments provide extensive excitation function data for inelastic neutron scattering as well as for other reactions such as (n,{alpha}), (n,n{alpha}), (n,p), (n,np), (n,nnp) and (n,xn) for 1 {le} {times} {le} 11. The continuous energy coverage available from 1 MeV to over 200 MeV is ideal for excitation… more

Date: January 1, 1990

Creator: Nelson, R. O.; Laymon, C. M. & Wender, S. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

High-resolution structural material (n,x. gamma. ) production cross sections for 0. 2 < E/sub n/ less than or equal to 40 MeV

An experimental program has been initiated at the Oak Ridge electron Linear Accelerator (ORELA) to measure yields of individual gamma rays resulting from interactions of 0.2- to 40-MeV neutrons with elements of structural materials of interest both for applied needs and basic research. In this paper we outline this program and present some cross-section results for /sup nat/Cr(n,x..gamma..) , /sup 56/Fe(n,x..gamma..) and /sup 58/Ni(n,x..gamma..). A good estimate of the total inelastic scatterin… more

Date: January 1, 1985

Creator: Larson, D.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Hypernuclear physics with the (/pi//sup +/, K/sup +/) reaction

The study of hypernuclei affords unique insights into the nature of hadronic forces beyond those obtainable from ordinary nuclear physics research. A hypernucleus consists of one or more hyperons bound to a nuclear core. In the SU(3) classification, /Lambda/,/Sigma/, and /Xi/ hyperons occupy the same octet representation of spin-parity /1/2//sup +/ baryons as the neutron and proton, the familiar constituents of ordinary nuclei. The /Lambda/ and /Sigma/ possess strangeness S = /minus/1 and isoto… more

Date: January 1, 1989

Creator: Millener, D. J. & Chrien, R. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

INC Model interpretation of the proton induced residual nuclide production cross sections below 2 GeV

For the purposes of interpreting the abundances of various isotopes in meteorites or on lunar and planetary surfaces exposed to fragmentation by cosmic rays, Webber et al. recently reported the measured total elemental and isotopic cross sections with heavy ions as projectiles on H, He, and C targets with beam energies of 0.33 - 1.7 GeV/nucleon. We employ the INC model to predict the fragmentation of the heavy ions in a hydrogen target with the inverse reaction process: proton bombardment of a … more

Date: December 31, 1991

Creator: Divadeenam, M.; Ward, T. E.; Spergel, M. S.; Lakatos, S. & Manche, E. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

INC Model interpretation of the proton induced residual nuclide production cross sections below 2 GeV

Date: January 1, 1991

Creator: Divadeenam, M.; Ward, T. E.; Spergel, M. S.; Lakatos, S. & Manche, E. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Inclusive quasielastic and deep inelastic electron scattering at high energies

With high electron energies a kinematic regime can be reached where it will be possible to separate quasielastic and deep inelastic scattering. We present a short description of these processes which dominate the inclusive spectrum. Using the highest momentum transfer data available to guide our estimates, we give the kinematic requirements and the cross sections expected. These results indicate that inclusive scattering at high q has a yet unfilled potential. 18 refs., 13 figs.

Date: January 1, 1990

Creator: Day, D.B.

Item Type: Article

Partner: UNT Libraries Government Documents Department