95-Am-242m

 95-AM-242MJAERI      EVAL-MAR88 T.NAKAGAWA                       
JAERI-M 89-008        DIST-SEP89                                  
----JENDL-3.2         MATERIAL 9547                               
-----INCIDENT NEUTRON DATA                                        
------ENDF-6 FORMAT                                               
HISTORY                                                           
80-03 NEW EVALUATION WAS MODE BY T.NAKAGAWA AND S.IGARASI (JAERI).
      DETAILS ARE GIVEN IN REF. /1/.                              
88-03 RE-EVALUATION WAS MADE FOR JENDL-3 BY T.NAKAGAWA (JAERI)/2/.
                                                                  
MF=1  GENERAL INFORMATION                                         
  MT=451  COMMENT AND DICTIONARY                                  
  MT=452  NUMBER OF NEUTRONS PER FISSION                          
           SUM OF PROMPT AND DELAYED NEUTRONS.                    
  MT=455  DELAYED NEUTRON DATA                                    
           ESTIMATED FROM TUTTLE'S SEMI-EMPIRICAL FORMULA /3/.    
  MT=456  NUMBER OF PROMPT NEUTRONS PER FISSION                   
           BASED ON THE RELATIVE MEASUREMENTS /4,5/ TO THE U-235  
           DATA, AND ON THE EMPIRICAL FORMULA BY HOWERTON /6/.    
                                                                  
MF=2  RESONANCE PARAMETERS                                        
  MT=151  RESONANCE PARAMETERS                                    
      RESOLVED RESONANCE PARAMETERS : BELOW 20 EV                 
           PARAMETERS FOR 48 LEVELS DEDUCED BY BROWNE ET AL./7/   
           AND THE SINGLE LEVEL BREIT-WIGNER FORMULA WERE ADOPTED.
                                                                  
      UNRESOLVED RESONANCE PARAMETERS : 20 EV - 30 KEV            
           PARAMETERS WERE DETERMINED SO AS TO REPRODUCE THE      
           FISSION CROSS SECTION OF BROWNE ET AL./7/.  BACKGROUND 
           SIG WAS GIVEN TO THE FISSION AT LOW ENERGIES.          
             AVERAGE WG = 0.05 EV, AVERAGE WF = 1.28 EV,          
             D-OBS = 0.4 EV, S0 = 1.07E-4, S1 = E-DEPENDENT,      
             R = 9.59 FM                                          
                                                                  
     CALCULATED 2200M/S CROSS SECTIONS AND RESONANCE INTEGRALS.   
                         2200 M/SEC   RES. INTEG.                 
             TOTAL        7969.  B        -                       
             ELASTIC         5.667 B      -                       
             FISSION      6409.  B     1560 B                     
             CAPTURE      1254.  B      246 B                     
                                                                  
MF=3  NEUTRON CROSS SECTIONS                                      
  BELOW 30 KEV: CROSS SECTIONS WERE REPRESENTED WITH THE          
                RESONANCE PARAMETERS.                             
  ABOVE 30 KEV:                                                   
                                                                  
  MT=1,2  TOTAL AND ELASTIC SCATTERING CROSS SECTIONS             
          CALCULATED WITH OPTICAL AND STATISTICAL MODEL CODE      
          CASTHY/8/.                                              
           THE SPHERICAL OPTICAL POTENTIAL PARAMETERS (MEV, FM) : 
              V= 42.0 - 0.107*E , R= 1.282 , A= 0.6               
              WS= 9.0 - 0.339*E + 0.0531*E**2 , R= 1.29 , A= 0.5  
              VSO= 7.0 , R= 1.282 , A= 0.6                        
                                                                  
  MT=4,51-72,91  INELASTIC SCATTERING CROSS SECTIONS              
          CALCULATED WITH CASTHY/8/.  THE LEVEL SCHEME WAS TAKEN  
          FROM THE COMPILATION BY ELLIS AND HAESE /9/, WITH       
          SHIFTED ENERGY ORIGIN AT -49 KEV.                       
              NO.     ENERGY(MEV)        SPIN-PARITY              
             G.S.      -0.049              1   -                  
               1       -0.005              0   -                  
               2        0.0                3   -                  
               3        0.0 (META STABLE)  5   -                  
               4        0.025              2   -                  
               5        0.064              6   -                  
               6        0.099              4   -                  
               7        0.099              5   -                  
               8        0.141              7   -                  
               9        0.193              3   -                  
              10        0.214              6   -                  
              11        0.214              7   -                  
              12        0.239              4   -                  
              13        0.239              2   -                  
              14        0.276              3   -                  
              15        0.292              5   -                  
              16        0.323              4   -                  
              17        0.361              6   -                  
              18        0.381              5   -                  
              19        0.439              7   -                  
              20        0.451              6   -                  
              21        0.532              7   -                  
              22        0.630              8   -                  
          OVERLAPPING LEVELS WERE ASSUMED ABOVE 0.632 MEV.        
          THE LEVEL DENSITY PARAMETERS WERE DETERMINED ON THE     
          BASIS OF NUMBER OF EXCITED LEVELS/10/ AND RESONANCE     
          LEVEL SPACING/11/.                                      
                                 AM-243     AM-242                
                      A(1/MEV)    31.3       29.6                 
                        T(MEV)    0.355      0.342                
                      C(1/MEV)    11.71      22.98                
                      E-X(MEV)    3.278      2.323                
       SPIN-CUTOFF(1/MEV**0.5)    31.81      30.85                
                PAIRING E(MEV)    0.5        0.0                  
                                                                  
  MT=16,17  (N,2N) AND (N,3N) CROSS SECTIONS                      
          TAKEN FROM JENDL-2 CALCULATED WITH THE EVAPORATION MODEL
          BY PEARLSTEIN /12/.                                     
                                                                  
  MT=18 FISSION CROSS SECTION                                     
          DETERMINED BY CUBIC SPLINE-FITTING TO THE DATA MEASURED 
          BY BROWNE ET AL./7/                                     
                                                                  
  MT=102 CAPTURE CROSS SECTION                                    
          CALCULATED WITH CASTHY/8/.  THE GAMMA-RAY STRENGTH      
          FUNCTION WAS ESTIMATED FROM WG=0.05 EV AND D-OBS=0.4 EV.
                                                                  
  MT=251 MU-L BAR                                                 
          CALCULATED WITH CASTHY/8/.                              
                                                                  
MF=4  ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS                 
  MT=2,51-72,91                                                   
          LEGENDRE COEFFICIENTS WERE GIVEN BY THE OPTICAL AND     
          STATISTICAL MODEL CALCULATIONS.                         
  MT=16,17,18                                                     
          ISOTROPIC DISTRIBUTIONS IN THE LABORATORY SYSTEM.       
                                                                  
MF=5  ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS                  
  MT=16,17,91 EVAPORATION SPECTRUM WITH NUCLEAR TEMPERATURE       
          CALCULATED FROM LEVEL DENSITIES.                        
  MT=18   FISSION SPECTRUM ESTIMATED FROM Z**2/A SYSTEMATICS BY   
          SMITH ET AL. /13/ BY ASSUMING E(CF-252) = 2.13 MEV.     
                                                                  
REFERENCES                                                        
 1) NAKAGAWA T. AND IGARASI S.: JAERI-M 8903 (1980), IN JAPANESE. 
 2) NAKAGAWA T.: JAERI-M 89-008 (1989).                           
 3) TUTTLE R.J.: INDC(NDS)-107/G+SPECIAL, 29 (1979).              
 4) JAFFEY A.H. AND LERNER J.L.: NUCL. PHYS., A145, 1 (1970).     
 5) KROSHKIN N.I. AND ZAMYATNIN YU.S.: ATOM. ENERG., 29, 95       
    (1970),  SOV. ATOM. ENERGY, 29, 790 (1970).                   
 6) HOWERTON R.J.: NUCL. SCI. ENG. 62, 438 (1977).                
 7) BROWNE J.C. ET AL.: PHYS. REV., C29, 2188(1984).              
 8) IGARASI S.: J. NUCL. SCI. TECHNOL., 12, 67 (1975).            
 9) ELLIS Y.A. AND HAESE R.L.: NUCL. DATA SHEETS 21, 615 (1977).  
10) ENSDF, EVALUATED NUCLEAR STRUCTURE DATA FILE (1988).          
11) MUGHABGHAB S.F.: "NEUTRON CROSS SECTIONS, VOL. 1, PART B",    
    ACADEMIC PRESS, INC. (1984).                                  
12) PEARLSTEIN S.: NUCL. SCI. ENG., 23, 238 (1965).               
13) SMITH A.B. ET AL. : ANL/NDM-50 (1979).