ENTRY 14399 20140917 14031439900000001 SUBENT 14399001 20140917 14031439900100001 BIB 13 28 1439900100002 TITLE Fission Neutron Spectrum of 239Pu 1439900100003 AUTHOR (N.Nereson) 1439900100004 REFERENCE (J,PR,88,(4),823,1952) 1439900100005 #doi:10.1103/PhysRev.88.823 1439900100006 REL-REF (M,14390001,N.Nereson,J,PR,85,(4),600,1952) 1439900100007 INSTITUTE (1USALAS) 1439900100008 FACILITY (REAC,1USALAS) Los Alamos fast reactor. 1439900100009 INC-SOURCE (REAC) Thermal neutron flux. 1439900100010 DETECTOR (PLATE) Ilford C2 nuclear emulsion plates. 1439900100011 SAMPLE A nickel-coated disk sample of 239Pu having 1439900100012 dimensions of 0.5-in. diameter and 0.125-in. thick. 1439900100013 METHOD (REC) The los Alamos Water boiler provided a 2-in 1439900100014 diameter thermal neutron beam. The C2 nuclear 1439900100015 emulsions plates were placed at right angles to the 1439900100016 beam at a distance of 20 cm from the plutonium 1439900100017 sample. A 35-hr irradiation at a power of 5.5 kW gave 1439900100018 suitable proton recoil track density in nuclear 1439900100019 plates. The data were accumulated from a total of 1439900100020 5500 proton recoil tracks. 1439900100021 ANALYSIS The measured relative neutron intensity, N(E), was 1439900100022 given as function of the neutron energy, E; the 1439900100023 tracks per unit energy interval have been divided by 1439900100024 the scattering cross section of hydrogen, sigma p, 1439900100025 corrected for tracks leaving the emulsion surfaces. 1439900100026 Unfortunately, this method does not allow to 1439900100027 discriminate between prompt and delayed neutrons. 1439900100028 ERR-ANALYS (DATA-ERR) No details are given. 1439900100029 HISTORY (20140917C) BP 1439900100030 ENDBIB 28 0 1439900100031 COMMON 1 3 1439900100032 EN 1439900100033 EV 1439900100034 0.0253 1439900100035 ENDCOMMON 3 0 1439900100036 ENDSUBENT 35 0 1439900199999 SUBENT 14399002 20140917 14031439900200001 BIB 2 3 1439900200002 REACTION (94-PU-239(N,F),,NU/DE,,REL) 1439900200003 Spectrum in relative units 1439900200004 STATUS (CURVE) Fig.1, page 823. 1439900200005 ENDBIB 3 0 1439900200006 NOCOMMON 0 0 1439900200007 DATA 3 19 1439900200008 E DATA DATA-ERR 1439900200009 MEV ARB-UNITS ARB-UNITS 1439900200010 0.386 43.025 2.057 1439900200011 0.586 65.393 3.197 1439900200012 0.739 72.461 2.741 1439900200013 0.945 62.393 2.629 1439900200014 1.212 58.030 2.169 1439900200015 1.540 57.545 2.398 1439900200016 1.861 49.294 2.399 1439900200017 2.289 48.001 2.512 1439900200018 2.507 38.617 2.172 1439900200019 2.939 27.844 1.714 1439900200020 3.465 21.746 1.713 1439900200021 3.992 17.018 1.827 1439900200022 4.541 12.060 1.598 1439900200023 5.072 11.558 1.600 1439900200024 5.600 8.543 1.599 1439900200025 6.140 5.299 1.599 1439900200026 6.672 6.053 1.484 1439900200027 7.212 3.037 1.599 1439900200028 7.787 2.531 1.141 1439900200029 ENDDATA 21 0 1439900200030 ENDSUBENT 29 0 1439900299999 ENDENTRY 2 0 1439999999999