ENTRY 31761 20160929 31753176100000001 SUBENT 31761001 20160929 31753176100100001 BIB 6 20 3176100100002 TITLE Prompt-neutron yield from the spontaneous fission of 3176100100003 Californium-252 3176100100004 AUTHOR (J.W.Boldeman) 3176100100005 INSTITUTE (3AULAUA) 3176100100006 REFERENCE (C,77NBS,,182,1977) 3176100100007 (J,NSE,55,188,1974) Data revised in 77NBS,,182,1977. 3176100100008 DETECTOR (STANK) The relative efficiency of the scintillator 3176100100009 was calculated by Monte Carlo method and was 3176100100010 normalized at 2 MeV by T(p,n) neutrons. 3176100100011 A Maxwellian spectrum with average energy 2.15 MeV 3176100100012 (T=1.43 MeV) was considered for the 252Cf spontaneous 3176100100013 fission neutron spectrum. 3176100100014 A coincidence between pulses from the 252Cf ion 3176100100015 chamber and liquid scintillator (from prompt fission 3176100100016 gamma rays and neutron-proton recoil events) initiated 3176100100017 40 mu-s counting 585 ns after fission. 3176100100018 HISTORY (20150521C) VS. 3176100100019 (20160927A) VS. Reference 77NBS,,182,1977 added. 3176100100020 Data in subent 002 superseded. New subent 003 added. 3176100100021 ERR-ANALYS moved from subent 001. 3176100100022 ENDBIB 20 0 3176100100023 NOCOMMON 0 0 3176100100024 ENDSUBENT 23 0 3176100199999 SUBENT 31761002 20160929 31753176100200001 BIB 5 21 3176100200002 REACTION (98-CF-252(0,F),PR,NU) 3176100200003 COMMENT Total neutron emission including delayed-neutron 3176100200004 fraction is added = 3.747 +/- 0.015 3176100200005 ERR-ANALYS (ERR-T) Total uncertainty determined from the 3176100200006 following partial unc. 3176100200007 (ERR-S) Statistical - 0.24% 3176100200008 (ERR-1) Dead time correction - 0.10% 3176100200009 (ERR-2) Delayed gamma rays - 0.07% 3176100200010 (ERR-3) Average energy of fission neutron spectra 0.12%3176100200011 (ERR-4) Accuracy of the efficiency calibration - 0.17% 3176100200012 (ERR-5) Variation neutron capture detection with 3176100200013 radius of detection in scintillator - 0.05% 3176100200014 (ERR-6) French effect - 0.10% 3176100200015 (ERR-7) Effect of hole through scintillator on 3176100200016 neutron-capture detection - 0.05% 3176100200017 (ERR-8) Effect of hole through scintillator on 3176100200018 neutron leakage - 0.10% 3176100200019 (ERR-9) Background error in proton recoil counter 0.10%3176100200020 STATUS (TABLE) Data from text p.202 of NSE,55,188,1974 3176100200021 (SPSDD,31761003) Data revised in 77NBS,,182,1977 3176100200022 HISTORY (20160927A) VS. Data superseded. 3176100200023 ENDBIB 21 0 3176100200024 COMMON 10 6 3176100200025 ERR-S ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 3176100200026 ERR-6 ERR-7 ERR-8 ERR-9 3176100200027 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 3176100200028 PER-CENT PER-CENT PER-CENT PER-CENT 3176100200029 0.24 0.10 0.07 0.12 0.17 0.05 3176100200030 0.10 0.05 0.10 0.10 3176100200031 ENDCOMMON 6 0 3176100200032 DATA 2 1 3176100200033 DATA ERR-T 3176100200034 PRT/FIS PRT/FIS 3176100200035 3.738 0.015 3176100200036 ENDDATA 3 0 3176100200037 ENDSUBENT 36 0 3176100299999 SUBENT 31761003 20160929 31753176100300001 BIB 5 26 3176100300002 REACTION (98-CF-252(0,F),PR,NU) 3176100300003 CORRECTION Corrections applied to experimental data: 3176100300004 - Dead time correction 3176100300005 252Cf +1.107 3176100300006 Low energy proton recoil +0.279 3176100300007 Relative +0.828 3176100300008 - Delayed gamma rays -0.28 3176100300009 - Variation neutron capture detector efficiency 3176100300010 for 252Cf and calibration neutrons +0.31 3176100300011 - French effect -0.10 3176100300012 - Background error in proton recoil counter -0.33 3176100300013 ERR-ANALYS (ERR-T) Total uncertainty determined from the 3176100300014 following partial unc. 3176100300015 (ERR-S) Statistical 0.24%3176100300016 (ERR-1) Dead time correction 0.10%3176100300017 (ERR-2) Delayed gamma rays 0.07%3176100300018 (ERR-3) Average energy of fiss. neutron spectra 0.12%3176100300019 (ERR-4) Accuracy of the energy calibration 0.17%3176100300020 (ERR-5) Variation neutron capture detector 3176100300021 efficiency for 252Cf and calibration neutrons 0.10%3176100300022 (ERR-6) French effect 0.10%3176100300023 (ERR-7) Effect of hole through scintillator on 3176100300024 neutron leakage 0.20%3176100300025 (ERR-8) Background error in proton recoil counter 0.10%3176100300026 STATUS (TABLE) Data from text p.184 of 77NBS,,182,1977 3176100300027 HISTORY (20160927C) VS. 3176100300028 ENDBIB 26 0 3176100300029 COMMON 9 6 3176100300030 ERR-S ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 3176100300031 ERR-6 ERR-7 ERR-8 3176100300032 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 3176100300033 PER-CENT PER-CENT PER-CENT 3176100300034 0.24 0.10 0.07 0.12 0.17 0.10 3176100300035 0.10 0.20 0.10 3176100300036 ENDCOMMON 6 0 3176100300037 DATA 2 1 3176100300038 DATA ERR-T 3176100300039 PRT/FIS PRT/FIS 3176100300040 3.746 0.016 3176100300041 ENDDATA 3 0 3176100300042 ENDSUBENT 41 0 3176100399999 ENDENTRY 3 0 3176199999999