ENTRY 14727 20220117 14951472700000001 SUBENT 14727001 20220117 14951472700100001 BIB 11 23 1472700100002 TITLE The Fission neutron spectrum of 25 1472700100003 AUTHOR (H.T.Richards,I.H.Perlman) 1472700100004 REFERENCE (R,LA-60,1944) 1472700100005 (R,LA-84,1944) 235U spectrum plot. 1472700100006 REL-REF (O,14664002,R.F.Christy+,R,CF-209,1942) 1472700100007 INSTITUTE (1USALAS) 1472700100008 FACILITY (VDG,1USAMIN) The Minnesota Van de Graaff. 1472700100009 INC-SOURCE (P-LI7) Neutrons of energy <250 keV energy were slowed 1472700100010 down by ~60 gm paraffin. The thermalized neutrons 1472700100011 produced fissions in a cylinder of uranium metal. The 1472700100012 plates were then placed 15 cm from the uranium so 1472700100013 that the fission neutrons would be well collimated. 1472700100014 SAMPLE A cylinder of uranium metal (weight 330 grams, size 1472700100015 approximately 3/4" x 5/4"). 1472700100016 DETECTOR (PLATE) The photographic emulsion technique. The 1472700100017 plates were 100 microm thick Ilford Special Halftone 1472700100018 plates, and were wrapped first in thin aluminum foil 1472700100019 and then in black paper. 1472700100020 METHOD (REC) The spectrum was inferred from the ranges of 850 1472700100021 protons recoiling in the forward direction. It shows 1472700100022 a very wide maximum at ~1.5 MeV with an exponentially 1472700100023 decreasing high energy tail which extends beyond 7 MeV.1472700100024 HISTORY (20220117C) BP 1472700100025 ENDBIB 23 0 1472700100026 COMMON 1 3 1472700100027 EN-DUMMY 1472700100028 EV 1472700100029 0.0253 1472700100030 ENDCOMMON 3 0 1472700100031 ENDSUBENT 30 0 1472700199999 SUBENT 14727002 20220117 14951472700200001 BIB 2 3 1472700200002 REACTION (92-U-235(N,F)0-NN-1,PR,KE,,SPA) 1472700200003 STATUS (DEP,14727003) 1472700200004 (TABLE) page 17 of R,LA-60,1944. 1472700200005 ENDBIB 3 0 1472700200006 NOCOMMON 0 0 1472700200007 DATA 1 1 1472700200008 DATA-APRX 1472700200009 MEV 1472700200010 1.85 1472700200011 ENDDATA 3 0 1472700200012 ENDSUBENT 11 0 1472700299999 SUBENT 14727003 20220117 14951472700300001 BIB 4 5 1472700300002 REACTION (92-U-235(N,F),PR,NU/DE,,REL/SPA) 1472700300003 REL-REF (O,14729002,H.T.Richards+,R,LA-84,1944) Later result 1472700300004 (other curve in Fig.2) 1472700300005 ERR-ANALYS (ERR-S) Statistical fluctuations. 1472700300006 STATUS (CURVE) Fig. 2, page 7 of R,LA-84,1944. 1472700300007 ENDBIB 5 0 1472700300008 NOCOMMON 0 0 1472700300009 DATA 3 16 1472700300010 E DATA ERR-S 1472700300011 MEV ARB-UNITS ARB-UNITS 1472700300012 1.230 381.044 29.014 1472700300013 1.634 397.485 31.915 1472700300014 2.017 356.867 35.783 1472700300015 2.420 349.130 35.783 1472700300016 2.821 220.503 29.014 1472700300017 3.223 143.133 27.079 1472700300018 3.596 107.350 24.178 1472700300019 4.000 110.251 27.079 1472700300020 4.403 70.600 23.211 1472700300021 4.796 30.948 15.474 1472700300022 5.200 19.342 10.638 1472700300023 5.594 48.356 23.211 1472700300024 6.007 12.573 10.638 1472700300025 6.391 27.079 18.375 1472700300026 6.785 16.441 13.540 1472700300027 7.189 18.375 14.507 1472700300028 ENDDATA 18 0 1472700300029 ENDSUBENT 28 0 1472700399999 ENDENTRY 3 0 1472799999999