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62-Sm-149 BNL+KAERI EVAL-AUG99 J.H.Chang and S.F.Mughabghab
DIST-JAN09 20090105
----JEFF-311 MATERIAL 6240
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
*************************** JEFF-3.1.1 *************************
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** Original data taken from: JEFF-3.1 **
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***************************** JEFF-3.1 *************************
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** Original data taken from: JEFF-3.0 **
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***************************** JEFF-3.0 ***********************
DATA TAKEN FROM :- ENDF/B-VI rel.4 (DIST-APR 0)
Increase by 3% of g_n for the 1st resonance (Er=9.73E-2 eV)
Recommendation C. Chabert et al. JEF/DOC-885
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ENDF/B-VI MOD 1 Evaluation, July 1999, J.H. Chang (KAERI) and
S.F. Mughabghab (BNL)
MF= 2 RESONANCE PARAMETERS (revised)
RESOLVED RESONANCES in MLBW
Resonance parameters are based on Mughabghab [Mu84]. In
addition, measurements by Georgiev [Ge92] were incorporated.
A bound level resonance was invoked to reproduce 2200 m/s
capture cross section Mughabghab [Mu84] and a bound coherent
scattering length of 19.08 fm [Ly90].
Average radiative width of 78.5 meV was assigned to resonances
for which widths had not been determined from measurements.
L that had not been determined from measurements was assigned
by applying Bayesian approach.
J that had not been determined from measurements was assigned
randomly.
Effective scattering radius of 8.3 fm was adopted from
Mughabghab [Mu84].
Calculated 2200 m/s cross sections and resonance integral
Cross Section (b) Res. Integral (b)*
Capture 40145. 3484.
Elastic 191.
* Integrated from 0.5 eV to 100 keV with 1/E spectrum
UNRESOLVED RESONANCE REGION in 'all energy-dependent parameters'
format (LRF=2)
Average parameters:
S (10**4) (eV)* (meV)
s-wave 4.53 2.45 78.5
p-wave 1.0 1.32 40.0
d-wave 4.0 0.99 78.5
* Level spacing at the neutron separation energy of target+n.
Average level spacing and strength function for s-wave were
deduced from the fitting of reduced widths of resolved
resonances to the Porter-Thomas distribution.
Strength function for p-wave was adopted from systematics,
[Mu84,Fig.4].
Average radiative widths for s- and d-wave of 78.5 meV were
adopted from the resolved resonances region data.
Average radiative width for p-wave of 40 meV was adopted
from systematics [Mu84, Fig.7].
Energy dependence of the level spacing was calculated
according to the Gilbert-Cameron's level density formula
with associated parameters from Mughabghab [Mu98].
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REFERENCES
[Ge92] Georgiev,G.P. et al., JINR-P3-92-346, Joint Inst. of
Nucl. Physics, Dubna (1992)
[Ly90] Lynn,J.E. and Seeger,P.A., Atomic Data and Nucl. Data
Tables 44, 191 (1990)
[Mu84] Mughabghab,S.F., Neutron Cross Sections, Vol.1, Part B,
Academic Press (1984)
[Mu98] Mughabghab,S.F. and Dunford,C.L., Proc.Int.Conf. on Phys.
of Nucl.Sci.Technol., p.784, Long Island, Oct.5-8,1998.
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ENDF/B-VI MOD 0 Evaluation, February 1990, NNDC
ENDF/B-V material converted to ENDF-6 format by NNDC
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ENDF/B-V Evaluation, MAT 1319, November 1978, R. Schenter,
D. Johnson F. Mann, F. Schmittroth (HEDL),
H. Gruppelaar (RCN), B. Leonard, K. Stewart (BNW)
HEDL,BNW EVAL-NOV78 SCHENTER,LEONARD,STEWART,ET AL.
DIST-FEB90 19900201
HEDL EVAL-NOV78 SCHENTER,JOHNSON (FAST CAPTURE)
HEDL EVAL-NOV78 MANN,SCHMITTROTH (FAST CAPTURE)
RCN EVAL-APR78 GRUPPELAAR (FAST CAPTURE)
BNW EVAL-JUN67 LEONARD,STEWART (ENDF/B-I)
MF= 1 GENERAL INFORMATION
MT=451 Atomic mass = 148.9169 I= 3.5 [2]
MF= 3 SMOOTH CROSS SECTIONS
MT= 1 Total 0.00001 to 2.361 eV calculated by Walker of Chalk
River Nuclear Laboratories in June 1979. Considering data
of [3,7,8,9].
10 to 70 keV: Schmidt [5].
70 keV to 2 MeV: Okazaki [10] elemental samarium
2.5 to 15 MeV: Foster [11] elemental samarium
Others: Optical-Model calculations [1] by ABACUS-2 [12].
MT= 2 Elastic scattering 0.00001 to 2.361 eV from Walker
calculation. No Bragg effects.
10 keV to 20 MeV: by subtraction of all other from total.
MT= 4 Inelastic scattering from ABACUS calculation [1].
MT= 16,17 n,2n and n,3n constructed [1] to be consistent
with compound nucleus formation from ABACUS calculation.
MT=102 Capture 0.00001 to 2.361 eV calculated by Walker.
100 eV to 20 MeV: HEDL-RCN reevaluation
MT=103 n,p based on 14 MeV value of Kenna [15].
MT=107 n,alpha assumed equal to n,p.
MF= 4 ANGULAR DISTRIBUTIONS (Legendre polynomials)
MT= 2 20x20 transformation matrix c.m.-lab calculated [1]
by CHAD. 19 c.m. legendre coeff. 10 keV to 20 MeV calculated
from angular distributions of ABACUS by modified version
of CHAD [1]. No compound-elastic included for energies
greater than 5 MeV.
MF= 5 SECONDARY ENERGY DISTRIBUTIONS
MT= 4 Inelastic scattering threshold to 2 MeV to 10 levels
[17] from Hauser-Feshbach ABACUS calculation [1].
2 to 20 MeV nuclear temperatures for Maxwellian [18].
MT= 16,17 Nuclear temperatures for Maxwellian [18]
thresholds to 20 MeV.
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REFERENCES
1. B.R. Leonard and K.B. Stewart, PNL (June 1967)
2. D.T. Goldman, Chart of the Nuclides, June 1964
3. H. Marshak and V.L. Sailor, Phys.Rev. 109, 1219 (1958)
4. M.D. Goldberg et al., BNL-325, 2nd Edition, Suppl.2, Vol.2C
(1966)
5. J.J. Schmidt and I. Siep, Karlsruhe report KFK-352 (1965)
6. J.M. Otter, report NAA-SR-11980, Vol.6 (1966)
7. N.J. Pattenden, Peaceful Uses of Atomic Energy, Proc. Conf.
Geneva, 1958, Vol.16 (United Nations, 1958) p.44
8. A.W. McReynolds and E. Andersen, Phys.Rev. 93, 195 (1954)
9. V.L. Sailor, H.H. Landon, H.L. Foote, Jr., Phys.Rev. 96,
1014 (1954)
10. A. Okazaki, S.E. Darden, R.B. Walton, Phys.Rev. 93, 461
(1954)
11. D.G. Foster Jr. and D.W. Glasgow, Phys.Rev.C 3, 576 (1971)
12. E.H. Auerbach, report BNL-6562 (1962)
13. V. Benzi and M.V. Bortolani, Nuclear Data for Reactors, Proc.
Conf., 1966, Paris (IAEA, 1967)
14. R.L. Macklin, J.H. Gibbons, T. Inada, Nature 197, 369 (1963)
15. B.T. Kenna and F.J. Conrad, report SC-RR-66-229 (1966)
16. R.F. Berland, Atomics Int. report NAA-SR-11231 (1965)
17. Nuclear Data Sheets, 5-2-17 (Dec.1962)
18. S. Weinberg and E. Wigner, The Physical Theory of Nuclear
Chain Reactions (U. of Chicago Press, 1958)
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