26-Fe- 54 JAEA EVAL-Jun21 N.Iwamoto DIST-DEC21 20210630 ----JENDL-5 MATERIAL 2625 -----INCIDENT NEUTRON DATA ------ENDF-6 FORMAT History 21-06 Evaluated with CCONE code by N.Iwamoto 21-09 Secondary energy grids were added below 100keV by N.Iwamoto 21-10 Secondary energy grids were revised below 100keV by N.Iwamot 21-11 (MF6/MT5) recoil spectrum added by O.Iwamoto MF= 1 General information MT=451 Descriptive data and directory MF= 2 Resonance parameters MT=151 Resolved and unresolved resonance parameters Resolved resonance region: below 1.036 MeV Resolved resonance parameters were taken from ENDF/B-VIII.0//1/. ------------------------------------------------------------ Comments for resonance evaluation in ENDF/B-VIII.0 ------------------------------------------------------------ The resonance region evaluation for 54Fe was initially evaluated at IRSN, up to 1.036 MeV, by using SAMMY to fit Pandey et al. [1] and Cornelis et al. [2] data. In both cases a time of flight correction was applied, accounting for energy shifts between fits and unmodified data retrieved from EXFOR. The evaluation uses the Reich-Moore approximation and the LRF=7 format. The initial J and parity assignments of resonances were taken from the Atlas of Neutron Resonances. As neither Cornelis et al. nor Pandey et al. resolved all resonances, the IRSN fits were supplemented with 64 resonances compiled in the newest edition of the Atlas, measured mostly by Giubrone et al. [3]. Even with the addition of these p- and d-wave resonances, the average capture cross section was substantially lower than the measured average capture data of Allen et al. (1976) [4]. We computed the capture background from 100 keV-1 MeV by subtracting the group-wise cross section determined from the resonance parameters from the Allen et al. data. This not only brought the average cross section into agreement with Allen et al. [4] data, but also with the new Wallner data [5]. To ensure a proper match of the fast region capture onto the average resonance region capture cross section, we extended our EMPIRE calculations to 10 eV and tuned our calculation to match the average data of Allen et al. (1976) [4]. The evaluation compares favorably with Atlas values for both the thermal cross sections and resonance integrals, but it does not match the KADoNiS-0.3 recommended value for MACS(30 keV) [6]. This is because the KADoNiS recommendation was based on a preliminary version of the Wallner data. Calculated 2200-m/s cross sections and res. integrals thermal res. integ. MACS (30 keV) total 4.417 b 125.96 b elastic 2.162 b 121.60 b capture 2.25 b 1.21 b 27.13 mb REFERENCES ---------- [1] M. S. Pandey, J. A. Harvey, J. B. Garg, and W. M. Good, "Dependence of level spacing of the isotopes of iron upon parity," Progress Report 5025 (1975). Oak Ridge National Lab. [2] E. Cornelis, L. Mewissen, and F. Poortmans, "Neutron resonance structure of 54Fe and 56Fe from high resolu- tion total cross section experiments," 135 (1982). Conf. on Nucl. Data for Sci. and Technol., Antwerp 1982. [3] G. Giubrone, Neutron capture measurement of 54Fe and 57Fe at CERN n-TOF. PhD thesis, University of Valencia (2014). [4] B. J. Allen, A. R. d. L. Musgrove, J. W. Boldeman, M. J. Kenny, and R. L. Macklin, "Resonance neutron capture in 56Fe," Nucl. Phys. A 269, 408 (1976). [5] A. Wallner, K. Buczak, T. Belgya, et al., "Precise measurement of the thermal and stellar 54Fe(n,g)55Fe cross sections via accelerator mass spectrometry," Phys. Rev. C (2017). Accepted. [6] I. Dillmann, R. Plag, F. Kappeler, and T. Rauscher, Kadonis v0.3 - the third update of the "Karlsruhe Astrophysical Database of Nucleosynthesis in Stars," in EFNUDAT Fast Neutrons - scientific workshop on neu- tron measurements, theory and applications, (Geel, Bel- gium) (2009). http:// www.kadonis.org/. ------------------------------------------------------------ Thermal cross sections and resonance integrals at 300 K ---------------------------------------------------------- 0.0253 eV res. integ. (*) (barn) (barn) ---------------------------------------------------------- Total 4.43694E+00 Elastic 2.18295E+00 n,gamma 2.25392E+00 1.19354E+00 ---------------------------------------------------------- (*) Integrated from 0.5 eV to 10 MeV. MF= 3 Neutron cross sections MT= 1 Total cross section Calculated with CCONE code /2/. Cross sections in the unresolved resonance region of 1.036 to 7 MeV were taken from JENDL-4.0/3/. MT= 2 Elastic scattering cross section Calculated with CCONE code /2/. MT=4,51-91 (n,n') cross section Calculated with CCONE code /2/. MT= 5 Total reaction (except fission) cross section Calculated with CCONE code /2/. MT= 16 (n,2n) cross section Calculated with CCONE code /2/. MT= 22 (n,na) cross section Calculated with CCONE code /2/. MT= 28 (n,np) cross section Calculated with CCONE code /2/. MT= 44 (n,n2p) cross section Calculated with CCONE code /2/. MT=102 Capture cross section Calculated with CCONE code /2/. MT=103,600-649 (n,p) cross section Calculated with CCONE code /2/. MT=104,650-699 (n,d) cross section Calculated with CCONE code /2/. MT=105,700-749 (n,t) cross section Calculated with CCONE code /2/. MT=106,750-799 (n,He3) cross section Calculated with CCONE code /2/. MT=107,800-849 (n,a) cross section Calculated with CCONE code /2/. MT=108 (n,2a) cross section Calculated with CCONE code /2/. MT=111 (n,2p) cross section Calculated with CCONE code /2/. MT=112 (n,pa) cross section Calculated with CCONE code /2/. MT=115 (n,pd) cross section Calculated with CCONE code /2/. MF= 4 Angular distributions of secondary particles MT= 2 Elastic scattering Calculated with CCONE code /2/. MF= 6 Energy-angle distributions of emitted particles MT= 5 Total reaction (except fission) reaction Calculated with CCONE code /2/. MT= 16 (n,2n) reaction Calculated with CCONE code /2/. MT= 22 (n,na) reaction Calculated with CCONE code /2/. MT= 28 (n,np) reaction Calculated with CCONE code /2/. MT= 44 (n,n2p) reaction Calculated with CCONE code /2/. MT=51-91 (n,n') reaction Calculated with CCONE code /2/. MT=102 Capture reaction Calculated with CCONE code /2/. MT=108 (n,2a) reaction Calculated with CCONE code /2/. MT=111 (n,2p) reaction Calculated with CCONE code /2/. MT=112 (n,pa) reaction Calculated with CCONE code /2/. MT=115 (n,pd) reaction Calculated with CCONE code /2/. MT=600-649 (n,p) reaction Calculated with CCONE code /2/. MT=650-699 (n,d) reaction Calculated with CCONE code /2/. MT=700-749 (n,t) reaction Calculated with CCONE code /2/. MT=750-799 (n,He3) reaction Calculated with CCONE code /2/. MT=800-849 (n,a) reaction Calculated with CCONE code /2/. MF= 8 Information on decay data MT=4 (n,n') reaction Decay chain is given in the decay data file. MT= 5 Total reaction (except fission) reaction Decay chain is given in the decay data file. MT= 16 (n,2n) reaction Decay chain is given in the decay data file. MT= 22 (n,na) reaction Decay chain is given in the decay data file. MT= 28 (n,np) reaction Decay chain is given in the decay data file. MT= 44 (n,n2p) reaction Decay chain is given in the decay data file. MT=102 Capture reaction Decay chain is given in the decay data file. MT=103 (n,p) reaction Decay chain is given in the decay data file. MT=104 (n,d) reaction Decay chain is given in the decay data file. MT=105 (n,t) reaction Decay chain is given in the decay data file. MT=106 (n,He3) reaction Decay chain is given in the decay data file. MT=107 (n,a) reaction Decay chain is given in the decay data file. MT=108 (n,2a) reaction Decay chain is given in the decay data file. MT=111 (n,2p) reaction Decay chain is given in the decay data file. MT=112 (n,pa) reaction Decay chain is given in the decay data file. MT=115 (n,pd) reaction Decay chain is given in the decay data file. MF=10 Nuclide production cross sections MT= 16 (n,2n) reaction Calculated with CCONE code /2/. MT=105 (n,t) reaction Calculated with CCONE code /2/. ------------------------------------------------------------------ nuclear model calculation with CCONE code /2/ ------------------------------------------------------------------ * Optical model potentials neutron : A.J.Koning and J.P.Delaroche/4/ modified proton : global OMP, A.J.Koning and J.P.Delaroche/4/ deuteron: Y.Han et al./5/ triton : folding OMP, A.J.Koning and J.P.Delaroche/4/ He-3 : Y.Xu et al./6/ alpha : L.McFadden and G.R.Satchler/7/ modified * Level scheme of Fe-54 ----------------------- No. Ex(MeV) J PI ----------------------- 0 0.000000 0 + 1 1.408190 2 + 2 2.538100 4 + 3 2.561300 0 + 4 2.949200 6 + 5 2.959000 2 + 6 3.166000 2 + 7 3.294800 4 + 8 3.344800 3 + 9 3.437400 4 + 10 3.793800 5 - 11 3.833200 4 + 12 3.841000 1 - 13 4.030900 5 + 14 4.047800 4 + 15 4.071600 3 - 16 4.099700 4 + 17 4.103400 8 - 18 4.267800 4 + 19 4.290800 0 + 20 4.578500 2 + 21 4.655300 0 + 22 4.696000 2 - 23 4.700100 2 + 24 4.781900 3 - 25 4.948700 4 + 26 5.044800 0 + 27 5.080000 4 - 28 5.145000 2 + 29 5.233000 0 + 30 5.248000 4 + 31 5.278800 1 + 32 5.313000 3 + 33 5.325000 2 + 34 5.392000 2 + 35 5.404000 4 - 36 5.431100 3 + 37 5.453000 3 + 38 5.461200 4 + 39 5.482000 5 + 40 5.506000 2 + ----------------------- * Level density parameters (Gilbert-Cameron model/8/) Energy dependent parameters of Mengoni-Nakajima/9/ were used. --------------------------------------------------------- a* Pair Eshell T E0 Ematch Elv_max 1/MeV MeV MeV MeV MeV MeV MeV --------------------------------------------------------- Fe-55 8.333 1.618 -2.981 1.428 -1.607 14.443 3.860 Fe-54 8.029 3.266 -3.371 1.524 -0.278 17.953 5.506 Fe-53 7.911 1.648 -3.333 1.540 -1.933 16.431 3.463 Mn-54 7.628 0.000 -2.202 1.423 -2.764 10.850 2.715 Mn-53 7.911 1.648 -2.189 1.410 -1.450 12.908 4.635 Mn-52 7.402 0.000 -2.729 1.480 -2.551 11.640 3.423 Cr-53 7.868 1.648 -1.137 1.298 -1.087 10.541 3.435 Cr-52 7.792 3.328 -1.323 1.378 0.001 13.627 4.100 Cr-51 8.132 1.680 -1.091 1.266 -1.145 10.462 3.002 Cr-50 6.722 3.394 -1.220 1.708 -1.871 17.835 5.336 --------------------------------------------------------- * Gamma-ray strength functions for Fe-55 E1: hybrid model(GH)/10/ ER= 18.76 (MeV) EG= 7.03 (MeV) SIG= 89.37 (mb) M1: standard lorentzian model(SLO) ER= 10.78 (MeV) EG= 4.00 (MeV) SIG= 1.88 (mb) E2: standard lorentzian model(SLO) ER= 16.57 (MeV) EG= 5.45 (MeV) SIG= 1.34 (mb) References 1) D.A.Brown et al., Nucl. Data Sheets, 148, 1 (2018) 2) O.Iwamoto, J. Nucl. Sci. Technol., 44, 687 (2007) 3) K.Shibata et al., J. Nucl. Sci. Technol., 49, 1 (2011) 4) A.J.Koning and J.P.Delaroche, Nucl. Phys. A713, 231 (2003) 5) Y.Han et al., Phys. Rev. C 74,044615(2006) 6) Y.Xu et al., Sci. China, Phys. Mech. & Astron., 54[11], 2005 (2011) 7) L.McFadden and G.R.Satchler, Nucl. Phys. 84, 177 (1966) 8) A. Gilbert and A.G.W. Cameron, Can. J. Phys, 43, 1446 (1965) 9) A. Mengoni and Y. Nakajima, J. Nucl. Sci. Technol., 31, 151 (1994) 10) S. Goriely, Phys. Lett. B436, 10 (1998)