ENTRY 30619 20100303 31443061900000001 SUBENT 30619001 20100303 31443061900100001 BIB 10 28 3061900100002 INSTITUTE (3AULAUA) 3061900100003 REFERENCE (J,ANS,32,733,197906) 3061900100004 (C,78HARWELL,,916,197809) Superseded 3061900100005 (P,AAEC/PR-44PD,1978) 3061900100006 AUTHOR (J.W.Boldeman,D.Culley,R.J.Cawley) 3061900100007 TITLE The fission neutron spectrum from the spontaneous 3061900100008 fission of Cf-252 3061900100009 METHOD (TOF). Flight distance = 3 m 3061900100010 DETECTOR (FISCH). As start signal 3061900100011 (SCIN) NE102 plastic scintillator for neutrons, 3061900100012 as stop signal 3061900100013 CORRECTION Data corrected for 3061900100014 .time-dependent and independent backgrounds 3061900100015 .dead-time 3061900100016 .neutron detection efficiencies 3061900100017 .neutron scattering in air of flight path 3061900100018 .contribution of delayed fission gammas 3061900100019 ERR-ANALYS (ERR-T) Error includes statistical and systematical 3061900100020 errors, in particular 3061900100021 .accuracy of meas.of flight path (about 1 mm), 3061900100022 (ERR-1) accuracy of timing calibration (0.25%) 3061900100023 (ERR-2) error contribution due to accuracy of 3061900100024 efficiency calibration (0.2%) 3061900100025 STATUS (TABLE) Data from Trans.Am.Nucl.Soc.32(1979)733-735. 3061900100026 HISTORY (19820122C) OS. 3061900100027 (20090725A) SD:Updated to new date formats,lower case. 3061900100028 (20100303A) SD: REACTION code in Subent 002 was changed3061900100029 according to EXFOR rules. 3061900100030 ENDBIB 28 0 3061900100031 COMMON 2 3 3061900100032 ERR-1 ERR-2 3061900100033 PER-CENT PER-CENT 3061900100034 0.25 0.2 3061900100035 ENDCOMMON 3 0 3061900100036 ENDSUBENT 35 0 3061900199999 SUBENT 30619002 20100303 31443061900200001 BIB 4 23 3061900200002 REACTION (98-CF-252(0,F)0-NN-1,,KE) 3061900200003 ANALYSIS Experimental spectrum was fitted to Maxwellian. 3061900200004 No systematic deviations from Maxwellian shape were 3061900200005 found between 1 and 13 MeV. Between 1 and 6 MeV 3061900200006 experimental data are consistent with the Maxwellian 3061900200007 shape to better than +- 2%. 3061900200008 The Maxwellian temperatures found from 6 experimental 3061900200009 runs are (in MeV) 3061900200010 1.4096 +- 0.0047 (statistical error) 3061900200011 1.4262 +- 0.0034 3061900200012 1.4410 +- 0.0044 3061900200013 1.4140 +- 0.0041 3061900200014 1.4150 +- 0.0061 3061900200015 1.4513 +- 0.0075 3061900200016 The weighted average of these values is 1.424 +- 0.010.3061900200017 The average kinetic energy is = T * 3/2. 3061900200018 COMMENT According to private communication by Boldeman 1981, 3061900200019 the measurements in the low-energy region from 0.1 to 3061900200020 1 MeV have not yet been fully evaluated but seem to 3061900200021 show no significant deviation from the Maxwellian 3061900200022 shape. 3061900200023 HISTORY (20100303A) SD: REACTION code was changed 3061900200024 according to EXFOR rules. 3061900200025 ENDBIB 23 0 3061900200026 NOCOMMON 0 0 3061900200027 DATA 2 1 3061900200028 DATA ERR-T 3061900200029 MEV MEV 3061900200030 2.1360E+00 2.0000E-02 3061900200031 ENDDATA 3 0 3061900200032 ENDSUBENT 31 0 3061900299999 ENDENTRY 2 0 3061999999999