ENTRY 30969 20150529 31703096900000001 SUBENT 30969001 20150529 31703096900100001 BIB 9 47 3096900100002 TITLE The Cf-252(sf) neutron spectrum in the 5- to 20-MeV 3096900100003 energy range 3096900100004 AUTHOR (H.Maerten,D.Richter,D.Seeliger,W.D.Fromm,R.Boettger, 3096900100005 H.Klein) 3096900100006 INSTITUTE (3DDRTUD,3DDRROS,2GERPTB) 3096900100007 REFERENCE (J,NSE,106,353,1990) 3096900100008 METHOD (TOF,PHD,PSD) The fission fragment signals obtained 3096900100009 by constant-fraction discriminators were used as 3096900100010 stop signal in the time-of-flight measurement. 3096900100011 Two-dimensional spectra of TOF versus scintillator 3096900100012 pulse height from both neutron detectors were measured 3096900100013 simultaneously. Background was suppressed by applying 3096900100014 pulse shape discrimination. 3096900100015 Measurements were carried out with the two neutron 3096900100016 detectors under different experimental conditions. 3096900100017 The main differences are the scintillator size, 3096900100018 length of flight path and detector position (0 and 60 3096900100019 deg. With respect to the axis perpendicular to the 3096900100020 Cf-252 backing plane). 3096900100021 the optimum bias of the neutron detector to ensure 3096900100022 a reliable foreground/background ratio, was determined 3096900100023 with the sliding bias method 3096900100024 DETECTOR (COIN,SCIN,IOCH) Two independent Ne-213 scintillators 3096900100025 for neutron detection, a miniature ionization chamber 3096900100026 for fast fission fragment detection. 3096900100027 Parameters of Ne-213 scintillators are: 3096900100028 1. 12.7 cm diameter by 12.7 cm thick, positioned 3096900100029 at 0 degrees with respect to the normal of the 3096900100030 Cf sample plane, at a distance of 5.905 m from 3096900100031 the sample. The time resolution was 1.5 ns FWHM. 3096900100032 2. 12.7 cm diameter by 3.81 cm thick, positioned at 3096900100033 60 degrees with respect to the normal of the 3096900100034 Cf sample plane, at a distance of 3.275 m from 3096900100035 the sample. The time resolution was 1.3 ns FWHM. 3096900100036 PART-DET (N,FF) 3096900100037 CORRECTION Corrections have been made for neutron attenuation, 3096900100038 TOF channel-dependent background due to noncorrelated 3096900100039 stop signals, influence of scattered neutrons, time 3096900100040 resolution, anisotropic fragment losses in fragment 3096900100041 detection efficiency 3096900100042 HISTORY (19911205C) HW 3096900100043 (20090512A) SD:Updated to new date formats,lower case 3096900100044 Subents 004,005 were added from 22219 Entry. 3096900100045 (20100722A) SD: data at 7. MeV was corrected: x10 in 3096900100046 Subents 002, 003. Subents 004, 005 were merged 3096900100047 with 002, 003 3096900100048 (20150528A) VS. Units in subents 002 and 003 corrected 3096900100049 ENDBIB 47 0 3096900100050 NOCOMMON 0 0 3096900100051 ENDSUBENT 50 0 3096900199999 SUBENT 30969002 20150529 31703096900200001 BIB 4 15 3096900200002 REACTION 1(98-CF-252(0,F),PR,NU/DE,,NPD) Tbl.2 3096900200003 2(98-CF-252(0,F),PR,NU/DE,,MXD) Tbl.2 3096900200004 detector in 0-deg position 3096900200005 2- ratio of measured neutron emission spectrum to Max-3096900200006 wellian spectrum of temperature 1.42 MeV. 3096900200007 ERR-ANALYS (ERR-SYS)The systematic errors include uncertainties 3096900200008 of neutron detection efficiency, energy scale, 3096900200009 energy bin width, light-output calibration and all 3096900200010 corrections. 3096900200011 (ERR-S) Statistical uncertainty 3096900200012 (ERR-T) Total uncertainty 3096900200013 STATUS (TABLE) Data are taken from J,NSE,106,353,90 Tbl. 2 3096900200014 HISTORY (20100722A) SD: data at 7. MeV was corrected: x10. 3096900200015 Subents 004, was merged with 002 3096900200016 (20150528A) VS. Data units corrected. 3096900200017 ENDBIB 15 0 3096900200018 COMMON 1 3 3096900200019 KT-NRM 2 3096900200020 MEV 3096900200021 1.42 3096900200022 ENDCOMMON 3 0 3096900200023 DATA 6 23 3096900200024 E DATA 1DATA 2ERR-S ERR-SYS ERR-T 3096900200025 MEV 1/MEV NO-DIM PER-CENT PER-CENT PER-CENT 3096900200026 5.0 4.282E-02 0.9713 0.3 5.5 5.53096900200027 5.5 3.152E-02 0.9695 0.4 5.3 5.33096900200028 6.0 2.244E-02 0.9397 0.5 5.2 5.23096900200029 6.5 1.568E-02 0.8971 0.6 5.2 5.23096900200030 7.0 1.143E-02 0.8962 0.7 5.1 5.13096900200031 7.5 7.824E-03 0.8447 0.8 5.1 5.23096900200032 8.0 5.666E-03 0.8403 1.0 5.2 5.33096900200033 8.5 4.102E-03 0.8393 1.2 5.2 5.33096900200034 9.0 2.887E-03 0.8165 1.5 5.3 5.53096900200035 9.5 1.944E-03 0.7607 1.7 5.4 5.73096900200036 10.0 1.438E-03 0.7801 2.1 5.4 5.83096900200037 10.5 1.102E-03 0.8298 2.6 5.5 6.13096900200038 11.0 7.781E-04 0.8139 3.1 5.6 6.43096900200039 11.5 5.586E-04 0.8127 3.7 5.8 6.93096900200040 12.0 4.087E-04 0.8278 4.2 6.0 7.33096900200041 13.0 1.966E-04 0.7735 4.1 6.4 7.63096900200042 14.0 9.145E-05 0.7013 5.7 6.8 8.93096900200043 15.0 5.915E-05 0.7783 7.1 7.3 10.23096900200044 16.0 2.823E-05 0.828 9.2 7.9 12.13096900200045 17.0 1.652E-05 0.9508 11.5 8.7 14.43096900200046 18.0 6.736E-06 0.7619 17.0 9.5 20.03096900200047 19.0 2.964E-06 0.6599 25.0 10.5 27.03096900200048 20.0 1.664E-06 0.7305 35.0 11.8 37.03096900200049 ENDDATA 25 0 3096900200050 ENDSUBENT 49 0 3096900299999 SUBENT 30969003 20150529 31703096900300001 BIB 4 15 3096900300002 REACTION 1(98-CF-252(0,F),PR,NU/DE,,NPD) tbl.3 3096900300003 2(98-CF-252(0,F),PR,NU/DE,,MXD) 3096900300004 detector in 60-deg position 3096900300005 2- ratio of measured neutron emission spectrum to Max-3096900300006 wellian spectrum of temperature 1.42 MeV. 3096900300007 ERR-ANALYS (ERR-SYS)The systematic errors include uncertainties 3096900300008 of neutron detection efficiency, energy scale, 3096900300009 energy bin width, light-output calibration and all 3096900300010 corrections. 3096900300011 (ERR-S) Statistical uncertainty 3096900300012 (ERR-T) Total uncertainty 3096900300013 STATUS (TABLE) Data are taken from J,NSE,106,353,90 Tbl. 3 3096900300014 HISTORY (20100722A) SD: data at 7. MeV was corrected: x10. 3096900300015 Subents 005, was merged with 003 3096900300016 (20150528A) VS. Data units corrected. 3096900300017 ENDBIB 15 0 3096900300018 COMMON 1 3 3096900300019 KT-NRM 2 3096900300020 MEV 3096900300021 1.42 3096900300022 ENDCOMMON 3 0 3096900300023 DATA 6 23 3096900300024 E DATA 1DATA 2ERR-S ERR-SYS ERR-T 3096900300025 MEV 1/MEV NO-DIM PER-CENT PER-CENT PER-CENT 3096900300026 5.0 4.268E-02 0.9682 0.5 5.9 5.93096900300027 5.5 3.332E-02 1.0248 0.6 5.8 5.83096900300028 6.0 2.398E-02 1.0042 0.6 5.8 5.83096900300029 6.5 1.667E-02 0.9538 0.8 5.7 5.83096900300030 7.0 1.191E-02 0.9337 0.8 5.6 5.73096900300031 7.5 8.161E-03 0.879 0.9 5.7 5.83096900300032 8.0 5.794E-03 0.8593 1.1 5.8 5.93096900300033 8.5 4.171E-03 0.8534 1.3 5.9 6.03096900300034 9.0 3.154E-03 0.8919 1.7 6.0 6.23096900300035 9.5 2.213E-03 0.866 2.0 6.1 6.43096900300036 10.0 1.44E-03 0.7811 2.5 6.2 6.73096900300037 10.5 1.031E-03 0.7765 3.0 6.3 7.03096900300038 11.0 7.444E-04 0.7786 3.6 6.5 7.43096900300039 11.5 5.13E-04 0.7463 4.9 6.8 8.43096900300040 12.0 3.643E-04 0.7377 5.4 7.2 9.03096900300041 13.0 1.889E-04 0.7433 5.6 7.9 9.73096900300042 14.0 1.055E-04 0.809 7.1 8.3 10.93096900300043 15.0 4.743E-05 0.7106 10.0 8.8 13.33096900300044 16.0 2.125E-05 0.6233 14.3 9.4 17.13096900300045 17.0 1.179E-05 0.6783 18.0 10.1 21.03096900300046 18.0 8.479E-06 0.959 21.0 10.9 24.03096900300047 19.0 2.758E-06 0.614 37.0 11.8 39.03096900300048 20.0 1.789E-06 0.7853 53.0 12.8 55.03096900300049 ENDDATA 25 0 3096900300050 ENDSUBENT 49 0 3096900399999 NOSUBENT 30969004 20100923 31463096900400001 NOSUBENT 30969005 20100923 31463096900500001 ENDENTRY 5 0 3096999999999