16-S - 36 FUJI E.C. EVAL-MAY87 H.NAKAMURA
DIST-MAR02 REV3-MAY01 20010517
----JENDL-3.3 MATERIAL 1637
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
87-05 Newly evaluated by H.Nakamura (fuji electric co. ltd.)
94-02 JENDL-3.2
New optical model calculation was performed by T. Watanabe
(khi).
Data were compiled by K. Shibata (jaeri).
***** modified parts for JENDL-3.2 ******************
(3,1),(3,4),(3,51-55),(3,91),(3,251),(4,2),(4,51-55)
optical and statistical model calculations.
(3,2) total - nonelastic
*******************************************************
01-04 JENDL-3.3
Gamma-ray production data were evaluated and compiled
by K. Shibata
***** modified parts for JENDL-3.3 ****************************
(1,451) Updated
(3,251) Deleted.
(4,2) Transformation matrix deleted.
(5,16-91) INT=22.
(12,16-107) Added.
(14,16-107) Added.
(15,16-107) Added.
****************************************************************
mf=1 General information
mt=451 Descriptive data and dictionary
mf=2 mt=151 Resonance parameters: (not given)
mf=3 Neutron cross sections
Below 1000 keV
Assumed cross sections, guided by those of s-32
(10**-5)eV (0.025)eV (1.0**4)eV (1.0**6)eV res.int.
mt=2 2.2 b 2.18 b 2.185 b 2.32339 b -
mt=102 3.5 b 0.15 b 0.001 b 0.00015 b 0.12095 b
mt=1 5.7 b 2.33 b 2.186 b 2.32354 b -
Above 1000 keV
mt=1,2,4,51-55,91,102
Total, elastic, inelastic and capture
calculated with casthy code /2/, considering the
competition with the threshold reaction channels.
Optical potential parameters of C.Y.Fu/3/ are adjusted
to reproduce the following experimental data:
mt=1 total -
mt=2 elastic cross sections of s-32
mt=4 inelastic -
The spherical optical potential parameters:
V = 38.0 Vso= 5.37 (MeV)
Ws= 9.13 Wv = 0.0 (MeV)
r =rso= 1.26 rs = 1.39 (fm)
a =aso= 0.76 b = 0.40 (fm)
mt=102 capture data are normalized to 0.15 mb at 1 MeV
based on s-32 capture cross section.
The discrete level scheme taken from ref./4/:
no. energy (MeV) spin-parity
(g.s.) 0.0 0 +
1 3.291 2 +
2 3.346 0 +
3 4.192 3 -
4 4.523 1 +
5 4.575 2 +
Continuum levels assumed above 5.0 MeV. The level
density parameters of Asano et al./5/ are used.
***** JENDL-3.2 ****************************************
mt=1,4,51-55,91,251
Optical and statistical model calculation
was performed by using the omp set given as follows:
V = 58.83 - 0.5635En (MeV)
Ws = 3.609 + 0.1819En (MeV)
Vso= 4.199 (MeV)
r = 1.306, a = 0.452 (fm)
rs = 1.124, b = 0.690 (fm)
rso= 1.010, aso= 0.750 (fm).
*********************************************************
mt=16(n,2n), 22(n,n'a), 28(n,n'p), 103(n,p), 107(n,a)
Based on the statistical model calculations with gnash
code /6/, without the precompound reaction correction.
Transmission coefficients for proton and alpha particle
are calculated by using the omp of Becchetti-Greenlees
/7/ and Huizenga-Igo/8/,respectively.
Level density parameters are based on built-in values.
mf=4 Angular distributions of secondary neutrons
mt=2 Calculated with optical model (casthy).
mt=51-55 Calculated with hauser-feshbach formula(casthy)
mt=16,22,28 Isotropic in the laboratory system.
mt=91 Isotropic distributions in cm were converted
to the distributions in lab.
mf=5 Energy distributions of secondary neutrons
mt=16,22,28,91,103,107 evaporation spectra.
mf=12 Photon production multiplicities
mt=16,22,28,103,107
Multiplicities were calculated by using the egnash code
/9/.
mt=102
Multiplicities were calculated by using the casthy code
/2/.
mt=51-55
Transition probability arrays were given.
mf=14 Photon angular distributions
mt=16,22,28,51-55,91,102,103,107
Isotropic
mf=15 Continuous photon energy spectra
mt=16,22,28,103,107
Multiplicities were calculated by using the egnash code
/9/.
mt=102
Multiplicities were calculated by using the casthy code
/2/.
References
1) Mughabghab, S.F. et al.: Neutron cross section, Vol.1 (1981).
2) Igarasi, S.: J. Nucl. Sci. Tech., 12, 67 (1975).
3) Fu, C.Y.: Atom. Data and Nucl. Data Tables., 17, 127 (1976).
4) Lederer, C.M. et al.: Table of isotopes. 7th edit.
5) Asano et al.: private communication.
6) Young, P.G. and Arthur, E.D.: LA-6947 (1977).
7) Becchetti, Jr. and Greenlees, G.W.: Polarization phenomena
in nuclear reactions, p.682 (1971).
8) Huizenga, Jr. and Igo, G.J.: Nucl. Phys., 29, 462 (1962).
9) Yamamuro, N.: JAERI-M 90-006 (1990).