IAEA-NDS ENDF Download System, v-2008-07-22 0 0 0 0 9.32370+ 4 2.35012+ 2 1 1 0 36263 1451 1 0.00000+ 0 0.00000+ 0 0 0 76 06263 1451 2 93-NP-237 ANC,LASL EVAL-JUN73 J.R.SMITH (ANC), W.E.STEIN (LASL)6263 1451 3 DIST-MAY74 6263 1451 4 * * * * * * * 6263 1451 5 P.C. TO NORMALIZATION AND STANDARDS SUBCOMMITTEE MARCH 1974 6263 1451 6 PERTINENT HOLLORITH FROM GENERAL FILE FOLLOWS (MAT 1263) 6263 1451 7 ALL REFERENCES CARRIED OVER FROM GENERAL FILE 6263 1451 8 237-NEPTUNIUM EVALUATED JUNE 1973 BY J.R.SMITH (AEROJET 6263 1451 9 NUCLEAR CO) AND W.E.STEIN (LOS ALAMOS) 6263 1451 10 * * * * * * * 6263 1451 11 THE BASIC CHANGES FROM THE VERSION III EVALUATION ARE: 6263 1451 12 1. A NEW FISSION EVALUATION BY W.E.STEIN, FROM 40 KEV TO 6263 1451 13 20 MEV. 6263 1451 14 2. NEW RESONANCE PARAMETERS, BOTH RESOLVED AND UNRESOLVED 6263 1451 15 3. REVISED CAPTURE CROSS SECTIONS. 6263 1451 16 4. RENORMALIZED (N,2N)AND (N,3N) DATA. 6263 1451 17 5. READJUSTMENT OF THE INELASTIC CROSS SECTIONS TO 6263 1451 18 ACCOMMODATE THE ABOVE CHANGES. 6263 1451 19 FILES I, IV, AND V AND THE LOW ENERGY POINTWISE DATA IN 6263 1451 20 FILE III ARE UNCHANGED. 6263 1451 21 CROSS SECTION VALVES AT E=0.0253 EV ARE: 6263 1451 22 TOTAL 186.63 BARNS 6263 1451 23 SCATTER 17.51 BARNS 6263 1451 24 CAPTURE 169.10 BARNS 6263 1451 25 FISSION 16.63 MILLIBARNS 6263 1451 26 MT=18 BELOW 0.3 EV THE FISSION CROSS SECTION IS GIVEN BY 6263 1451 27 THE SAME POINTWISE FILE THAT WAS USED IN VERSION III. 6263 1451 28 THE FISSION CROSS SECTION AT 0.0253 EV IS 16.63 MB. 6263 1451 29 ABOVE 40 KEV THE FISSION CROSS SECTION HAS BEEN 6263 1451 30 REEVALUATED BY W.E.STEIN. THE EVALUATION FOLLOWED 6263 1451 31 WHITE ET AL (14) FROM 40 TO 505 KEV, KLEMA(15)(RENORM)6263 1451 32 TO 1.0 MEV, STEIN(16), 1.0 TO 4.5 MEV, AND PANKRATOV 6263 1451 33 (17), 4.5 TO 20 MEV, NORMALIZED TO WHITE AND 6263 1451 34 WARNER(18). THE ESTIMATED ERRORS IN THE FISSION 6263 1451 35 CROSS SECTION ARE AS FOLLOWS: 6263 1451 36 ENERGY RANGE STANDARD ERROR 6263 1451 37 (MEV) (PER CENT) 6263 1451 38 RES. RANGE 50 6263 1451 39 0.040