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).