20-Ca- 48 JAEA EVAL-JUN06 K.Shibata
DIST-MAY10 20091228
----JENDL-4.0 MATERIAL 2049
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
History
06-06 Evaluated by K.Shibata.
09-12 Compiled by K.Shibata
MF=1 General information
MT=451 Descriptive data and dictionary
MF=2 Resonance parameters
MT=151 Resolved resonance parameters
The resolved resonance region remains unchanged from JENDL-3.3.
Resolved parameters for MLBW formula were given in the energy
region from 1.0e-5 eV to 500 keV. Parameters were taken from
the recommended data of BNL/1/ and the data for a negative
resonance were added so as to reproduce the recommended thermal
cross sections for capture and scatterng/1/. The scattering
radius was assumed to be 3.6 fermi.
Thermal cross sections and resonance integrals at 300 K
----------------------------------------------------------
0.0253 eV res. integ. (*)
(barns) (barns)
----------------------------------------------------------
Total 4.8493E+00
Elastic 3.7565E+00
n,gamma 1.0929E+00 4.8440E-01
----------------------------------------------------------
(*) Integrated from 0.5 eV to 10 MeV.
MF=3 Neutron cross sections
Below 500 keV, zero background cross section was given and all
the cross-section data are reproduced from the evaluated
resolved resonance parameters with MLBW formula.
The cross sections were calcualted /2/ by using the TNG code
/3/. The optilcal model parameters of Koning and Delaroche /4/
were used for neutrons and protons. The alpha-particle
potential parameters were derived from the code developed by
Kumar and Kailas./5/
MT= 1 Total
The cross sections were calculated with the TNG code./3/
MT= 2 Elastic scattering
Obtained by subtracting the sum of the partial cross sections
from the total cross section.
MT= 4, 51-61, 91 Inelastic scattering
The cross sections were calculated with the TNG code./3/
MT= 16 (n,2n)
The cross sections were calculated with the TNG code./3/
MT= 17 (n,3n)
The cross sections were calculated with the TNG code./3/
MT= 22 (n,na)
The cross sections were calculated with the TNG code./3/
MT= 28 (n,np)
The cross sections were calculated with the TNG code./3/
MT= 102 Capture
The cross sections were calculated with the TNG code./3/
MT= 103 (n,p)
The cross sections were calculated with the TNG code./3/
MT= 107 (n,a)
The cross sections were calculated with the TNG code./3/
MT= 600-649 partial (n,p) cross sections
The cross sections were calculated with the TNG code./3/
MT= 800-849 partial (n,a) cross sections
The cross sections were calculated with the TNG code./3/
MF=4 Angular distributions of secondary neutrons
MT=2
Calculated with the TNG code/3/.
MF=6 Energy-angle distributions of secondary particles
MT= 16 (n,2n) reaction
Neutron and gamma-ray spectra calculated with TNG/3/.
MT= 17 (n,3n) reaction
Neutron calculated with TNG/3/. Gamma-ray channel is not open.
MT= 22 (n,na) reaction
Neutron, alpha-particle, and gamma-ray spectra calculated with
TNG/3/.
MT= 28 (n,np) reaction
Neutron, proton, and gamma-ray spectra calculated with TNG/3/.
MT= 51-61 (n,n') reaction
Neutron angular distributions and discrete gamma-ray spectra
calculated with TNG/3/.
MT= 91 (n,n') reaction
Neutron spectra, and discrete-continuous gamma-ray spectra
calculated with with TNG/3/.
MT= 102
Calculated with the TNG code /3/.
MT= 600 (n,p) reactions leading to the ground state
Isotropic proton angular distributions.
MT= 649 (n,p) reaction leading to continuum levels
Proton spectra calculated with TNG/3/.
MT= 800 (n,a) reactions leading to the ground state
Isotropic alpha-particle angular distributions.
MT= 849 (n,a) reaction leading to continuum levels
Alpha-particle spectra calculated with TNG/3/.
< Appendix >
******************************************************************
* Nuclear Model Calcualtions with TNG Code /3/ *
******************************************************************
The description of the model calculations is given in Ref.2.
< Optical model parameters >
Neutron and protons:
Koning and Delaroche /4/
Alphas:
The potential parameters were obtained using the code developed
by Kumar and Kailas./5/
< Level scheme of Ca- 48 >
-------------------------
No. Ex(MeV) J PI
-------------------------
0 0.00000 0 +
1 3.83170 2 +
2 4.28330 0 +
3 4.50330 4 +
4 4.50700 3 -
5 4.61200 3 +
6 5.14560 3 +
7 5.26060 4 -
8 5.31140 2 +
9 5.31400 1 -
10 5.36980 3 -
11 5.46100 0 +
The direct-reaction process was taken into account for the 1st,
4th, and 10th levels by DWBA.
< Level density parameters >
Energy dependent parameters of Mengoni-Nakajima /6/ were used.
----------------------------------------------------------
Nuclei a* Pair Esh T E0 Ematch Econt
1/MeV MeV MeV MeV MeV MeV MeV
----------------------------------------------------------
Ca- 49 7.706 1.714 -0.694 0.653 3.644 7.276 4.617
Ca- 48 6.966 3.464 -1.171 1.192 2.722 8.216 5.729
Ca- 47 7.460 1.750 -0.360 0.759 3.034 7.442 4.386
Ca- 46 6.726 3.539 0.523 1.285 1.138 10.682 5.782
K - 48 6.972 0.000 -0.009 0.920 0.000 2.312 0.000
K - 47 6.524 1.750 0.033 0.729 3.661 7.442 3.350
Ar- 45 7.212 1.789 1.293 0.780 1.789 3.609 1.789
Ar- 44 6.485 3.618 1.924 0.814 3.618 5.411 3.618
----------------------------------------------------------
References
1) Mughaghab S.F. et al.:"Neutron Cross Sections", Vol. 1, Part
A (1981).
2) Shibata, K: J. Nucl. Sci. Technol., 44, 10 (2007).
3) Fu, C.Y.: ORNL/TM-7042 (1980); Shibata, K., Fu, C.Y.: ORNL/TM-
10093.
4) Koning, A.J., Delaroche, J.P.: Nucl. Phys., A713, 231 (2003).
5) Kumar, A., Kailas, S: a computer code contained in RIPL-2,
private communication (2002).
6) Mengoni, A., Nakajima, Y. Nucl. Sci. Technol., 31, 151 (1994).