7-N - 15 JAEA EVAL-Jan19 S.Kunieda DIST-DEC21 ----JENDL-5 MATERIAL 728 -----INCIDENT NEUTRON DATA ------ENDF-6 FORMAT History 19-01 Data are taken from R-matrix analysis with AMUR up to 5.5 MeV (S.Kunieda & O.Iwamoto) 21-11 revised by O.Iwamoto (MF8/MT16,22,28,32,33,102-105,107) JENDL/AD-2017 adopted (MF8/MT4) added 21-11 above 20 MeV, JENDL-4.0/HE merged by O.Iwamoto 21-11 (MF6/MT5) recoil spectrum added by O.Iwamoto 21-12 (MF6/MT5) modified by O.Iwamoto ZAP=2003 DDX emission ene. rescaled near reaction threshold ****************************************************** * * * --- JENDL-5.0 --- * * * * Incident neutron data up to 200 MeV * * * ****************************************************** Data evaulation was performed with an R-matrix code AMUR/1,2/ up to 5.5 MeV MeV. Experimental data fitted are total cross-sections of Zeitnitz+/3/, differential elastic scattering cross-sections of Sikkema+/4/ and the recommendation value of Mughabghab+ for thermal (n,n) cross-section. New evaluations are compiled in (MF,MT) as follos with covarinance data. (3,1),(3,2) : Cross sections (4,2) : Angular distribution (33,1),(33,2) : Covariance data for cross sections References 1) S.Kunieda+, Nucl. Data Sheets 118:250 (2014). 2) S.Kunieda+, Nucl. Data Sheets 123:159 (2015). 3) B.Zeitnitz, Nucl. Phys. A 166:443, (1971). 4) C.P.Sikkema., Phys. Rev. C 39:766, (1989). ****************************************************************** History for JENDL-5.0 19-01 New evaluation was performed for E < 5.5 MeV with AMUR for (MF,MT) = (3,1),(3,2),(4,2),(33,1),(33,2), where all the cross-sections of JENDL-4.0 were scaled by a factor of 0.98 above 5.5 MeV. ****************************************************************** ################################################## ### Descriptive texts of previous data ### ################################################## HISTORY 88-12 Newly evaluated by T.Fukahori (jaeri)/1/ 94-04 JENDL-3.2 Compiled by T.Fukahori and K.Shibata (ndc/jaeri) ***** modified parts for JENDL-3.2 ******************** ( 2,151) Omitted except scattering radius ( 3, 1) Below 5.5 MeV, changed to point-wise cross section ( 3, 2) Below 5.5 MeV, changed to point-wise cross section ( 3,102) Below 5.5 MeV, changed to point-wise cross section (12,102) From energy balance *********************************************************** 01-07 Compiled by K.Shibata for JENDL-3.3 ***** modified parts for JENDL-3.3 ******************** (1,451) Updated. (3.1) Re-calculated. (3,102) Revised. (3,251) Deleted. (4,2) Transformation matrix deleted. (5,16-91) INT=22 *********************************************************** 06-05 Covariances for MF/MT=33/1 and 33/2 were added by K.Shibata. 10-01 Comments and MODn modified for JENDL-4.0. mf=1 General information mt=451 Descriptive data and dictionary mf=2 Resonance parameters mt=151 Only scattering radius is given. 2200 m/sec cross sections and resonance integrals 2200 m/sec res. integ. total 4.590 b - elastic 4.590 b - capture 0.024 mb 0.016 mb mf=3 Cross sections mt=1 Total cross section Below 5.5 MeV, resonance parameters of the multi-level Breit-Wigner formula /2,3/ are adjusted to reproduce the experimental data of B.Zeitnitz et al./4/, and given as point-wise data. Above 5.5 MeV, smooth curve was obtained by fitting to the experimental data of B.Zeitnitz et al. mt=2 Elastic scattering cross section Below 5.5 MeV, point-wise cross section obtained from MLBW calculation is given. Above 5.5 MeV, the cross section was obtained by subtracting the reaction cross sections from the total cross section. mt=4 Total inelastic scattering cross section Sum of mt=51-66 and 91. mt=16,22,28,32,33,103,104,105,107 Calculated with gnash /5/. The optical potential potential parameters, the level density parameters and the level scheme are shown in tables 1-3, respectively. mt=51-91 Inelastic scattering Calculated with casthy /6/. The parameters are also shown in tables 1-3. mt=102 Capture cross section Below 5.5 MeV, point-wise cross section obtained from MLBW calculation is given. Above 5.5 MeV, the cross section was obtained by casthy calculation. For JENDL-3.3, the direct p-wave capture was considered using the formula derived by Meissner et al./11/ mf=4 Angular distributions of secondary neutrons mt=2,51-66 Based on the casthy calculation. mt=16,22,28,32,33,91 Assumed to be isotropic in the center of mass system. mf=5 Energy distributions of secondary neutrons mt=16,22,28,32,33,91 Based on the gnash calculation. mf=12-15 Gamma-ray data Based on the gnash calculation. For mf=12,mt=102, modification was done for energy balance. mf=33 Covariances mt=1 Based on the least-squares fit to the measurements /4,12- 16/. mt=2 Below 5.5 MeV, the covariance matrix is the same as that for mt1. Above 5.5 MeV, the covariances were obtained from the Kalman/Eliese-Casthy calculations /17/. The detais are given in Ref.18. Table 1 The optical potential parameters ------------------------------------------------------------------ neutron V = 50.08-0.012E MeV r0 = 1.22 fm a0 = 0.66 fm Ws = 8.91+0.618E MeV ri = 1.45 fm ai = 0.13 fm Vsym= 5.50 MeV r0 = 1.15 fm a0 = 0.50 fm proton V = 51.30-0.220E MeV r0 = 1.21 fm a0 = 0.61 fm Ws = 6.40-0.050E MeV ri = 1.03 fm ai = 0.53 fm Vsym= 6.00 MeV r0 = 1.06 fm a0 = 0.53 fm deuteron Perey-Perey's potential/7/ triton Becchetti-Greenlees's potential/8/ alpha V = 43.9 MeV r0 = 1.91 fm a0 = 0.45 fm Wv = 3.85 MeV ri = 1.91 fm ai = 0.45 fm ------------------------------------------------------------------ Table 2 The level density parameters ------------------------------------------------------- a(1/MeV) t(MeV) pair.(MeV) Ex(MeV) ------------------------------------------------------- B-11 1.431 6.149 2.67 25.58 B-12 1.491 6.201 0.0 26.78 C-12 1.700 5.971 5.60 37.91 C-13 1.846 5.382 2.80 30.57 C-14 1.988 4.887 5.00 28.94 C-15 1.988 4.600 0.0 19.28 N-14 1.600 5.000 0.0 10.00 N-15 2.130 3.758 2.20 10.07 N-16 2.130 4.547 0.0 22.11 ------------------------------------------------------- Table 3 The level scheme (energy(MeV), spin and parity)/3,9,10/ ------------------------------------------------------------------ N-14 N-15 N-16 C-15 C-14 C-13 ------------------------------------------------------------------ gs 0.0 1+ 0.0 1/2- 0.0 2- 0.0 1/2+ 0.0 0+ 0.0 1/2- 1 2.313 0+ 5.270 5/2+ 0.120 0- 0.740 5/2+ 6.094 1- 3.089 1/2+ 2 3.948 1+ 5.299 1/2+ 6.589 0+ 3.685 3/2- 3 4.915 0- 6.324 3/2- 6.728 3- 3.854 5/2+ 4 5.106 2- 7.155 5/2+ 6.903 0- 5 5.691 1- 7.301 3/2+ 7.012 2+ 6 5.834 3- 7.567 7/2+ 7.341 2- 7 6.204 1+ 8.313 1/2+ --------------------------------------- 8 6.446 3+ 8.571 3/2+ C-12 B-11 B-12 9 7.029 2+ 9.050 1/2+ --------------------------------------- 10 9.152 3/2- gs 0.0 0+ 0.0 3/2- 0.0 1+ 11 9.155 5/2+ 1 2.125 1/2- 0.953 2+ 12 9.225 1/2- 2 4.445 5/2- 1.674 2- 13 9.758 5/2- 3 5.020 3/2- 2.620 1- 14 9.829 7/2- 4 6.743 7/2- 2.720 0+ 15 9.928 3/2- 5 6.793 1/2+ 16 10.070 3/2+ 6 7.286 5/2+ ------------------------------------------------------------------ References 1) Fukahori T.: JAERI-M 89-047 (1989). 2) Mughabghab S.F. et al. : 'Neutron Cross Sections' Vol.1 Part A (Academic Press 1981, New York) 3) Ajzenberg-Selove F.: Nucl. Phys. A460 (1986) 1 4) Zeitnitz B. et al.: KfK-1443 (1971) 5) Young P.G. et al.: GNASH, a preequilibrium,statistical nuclear-model code for calculation of cross section and emission spectra, LA-6947 (1977). 6) Igarasi S. and Fukahori T.: JAERI 1321 (1991). 7) Perey F.G.: Phys. Rev. 131 (1963) 745 8) Becchetti Jr. F.D. and Greenlees G.W.: 'Polarization Phenomena in Nuclear Reactions', the University of Wisconsin Press (1971) 9) Ajzenberg-Selove F.: Nucl. Phys. A449 (1986) 1 10) Ajzenberg-Selove F.: Nucl. Phys. A433 (1985) 1 11) Meissner J. et al.: Phys. Rev. C53 (1996) 977 12) Sikkema C.P.: Nucl. Phys. 32 (1962) 470 13) Schellenberg L. et al.: Helevetica Physica Acta, 32 (1959) 357 14) Fossan D.B. et al.: Phys. Rev. 135 (1964) B1347 15) Fossan D.B. et al.: Phys. Rev. 152 (1966) 980 16) Donoghue T.R. et al.: Nucl. Phys. 54 (1964) 49 17) Kawano T, Shibata K.: JAERI-Data/Code 97-037 (1997) [in Japanese] 18) Shibata K, Nakagawa T.: J. Nucl. Sci. Technol., 44, 1 (2007).