ENTRY 30600 20120518 31553060000000001 SUBENT 30600001 20120518 31553060000100001 BIB 11 27 3060000100002 INSTITUTE (3CPRAEP) 3060000100003 REFERENCE (J,CNP,2,(1),29,198002) in Chinese, English abstract 3060000100004 AUTHOR (Zhang Huanqiao,Xu Jincheng,Liu ZUhua,Wen Tongqing, 3060000100005 Ding Shengyao,Chen Zhicai) 3060000100006 TITLE -The dependence of average numbers of prompt fission 3060000100007 neutron of Pu-239 on incident fast neutron energies.- 3060000100008 FACILITY (ACCEL,3CPRAEP) Electrostatic accelerator 3060000100009 SAMPLE Electro-deposit of Pu-239 on stainless steel, 3060000100010 thickness of 0.1 mm. Sample thickness about 0.5 mg/cm2.3060000100011 U 3.6+-0.4%, Th less than 0.2%,Pu-240 about 0.9% 3060000100012 (from measurement of spontaneous fission). 3060000100013 METHOD Liquid scintillation method. 3060000100014 DETECTOR (STANK) Gadolinium-loaded liquid scintillator in a 3060000100015 spherical aluminum container. Gd content,0.33% of 3060000100016 weight. Atomic ratio of Gd to hydrogen is 0.00023. 3060000100017 .Detection efficiencies of neutron were measured, 3060000100018 corrected and summarized in a Table. 3060000100019 (FISCH) For fission events. 3060000100020 (SCIN) Stilben crystal for monitor reaction. 3060000100021 MONITOR (1-H-1(N,EL)1-H-1,,SIG) Stilben crystal was used. 3060000100022 PART-DET (N) 3060000100023 HISTORY (19810918C) KO. 3060000100024 (19811130U) KO.-Keyword 'reaction' was misused instead 3060000100025 of 'monitor'. - 3060000100026 (19850215U) OS. Country code corrected. 3060000100027 (20090725A) SD:Updated to new date formats,lower case. 3060000100028 (20120504A) VS. INC-SOURCE moved to 002. 3060000100029 ENDBIB 27 0 3060000100030 NOCOMMON 0 0 3060000100031 ENDSUBENT 30 0 3060000199999 SUBENT 30600002 20120518 31553060000200001 BIB 6 37 3060000200002 REACTION (94-PU-239(N,F),PR,NU) 3060000200003 INC-SOURCE (P-LI7) For 0.186 and 0.258 MeV neutrons, 3060000200004 Li-F thicknesses 0.51 and 0.67 mg/cm2. 3060000200005 (P-T) for 0.385 to 1.440 MeV neutrons, 3060000200006 T-Ti target, thickness of 0.96 mg/cm2. 3060000200007 ADD-RES The experimental data were fitted by a least square 3060000200008 method with a straight line as follows: 3060000200009 nubar(prompt)(En)=(2.858+-0.015)+(0.102+-0.017)*E(n) 3060000200010 where E(n) is the incident neutron energy (MeV). 3060000200011 COMMENT The final detection efficiency for the neutrons from 3060000200012 fission of Pu-239 is between 0.595 and 0.596. 3060000200013 STATUS (TABLE) Data taken from Table 3 of 3060000200014 Chinese J.Nucl.Phys.,2,(1), (1980)29. 3060000200015 ERR-ANALYS (DATA-ERR) Corrections and errors in efficiency and 3060000200016 nu measurement are following. 3060000200017 ** Efficiency ** Correction(%) Relative error(%) 3060000200018 Counting statistics +-0.16 3060000200019 Pulse pile up 0.28 +-0.06 3060000200020 Crystal end effect -0.02 +-0.00 3060000200021 c-p scattering -0.75 +-0.15 3060000200022 p-p scattering -0.64 +-0.13 3060000200023 Fission n-spectrum +-0.3 3060000200024 Channel effect -1.95 +-0.29 3060000200025 Anisotropic effect 3060000200026 of fission neutron 0.05 +-0.01 3060000200027 == Sum == -3.03 +-0.49 3060000200028 ** Neutron fission ** 3060000200029 Correction(%) Relative error(%) 3060000200030 Counting statistics +-(0.3 - 0.5) 3060000200031 False gate, 0.30 +-0.06 3060000200032 Dead time, 0.57 +-0.06 3060000200033 Efficiency, 3.03 +-0.49 3060000200034 U-238 fast n.fission,0.77 at E(n)=1.44MeV, +-0.07 3060000200035 Pu-240 fast n.fission, --- +-0.02 3060000200036 Delayed gamma-ray, -0.64 at E(n)=1.44MeV, +-0.16 3060000200037 Slowing down effect, --- +-0.5 3060000200038 == Sum == 4.03 +-(0.8 - 0.9) 3060000200039 ENDBIB 37 0 3060000200040 NOCOMMON 0 0 3060000200041 DATA 5 8 3060000200042 EN +EN-RSL -EN-RSL DATA DATA-ERR 3060000200043 MEV MEV MEV PRT/FIS PRT/FIS 3060000200044 1.8600E-01 1.0100E-01-4.7000E-02 2.8670E+00 2.6000E-02 3060000200045 2.5800E-01 8.7000E-02-5.3000E-02 2.8720E+00 2.4000E-02 3060000200046 3.8500E-01 7.1000E-02-6.8000E-02 2.9420E+00 2.4000E-02 3060000200047 6.0300E-01 6.8000E-02-6.8000E-02 2.9050E+00 2.3000E-02 3060000200048 7.6600E-01 6.1000E-02-6.4000E-02 2.9240E+00 2.4000E-02 3060000200049 1.0290E+00 5.5000E-02-5.7000E-02 2.9660E+00 2.4000E-02 3060000200050 1.2380E+00 4.8000E-02-5.3000E-02 2.9720E+00 2.3000E-02 3060000200051 1.4400E+00 4.8000E-02-5.2000E-02 3.0120E+00 2.3000E-02 3060000200052 ENDDATA 10 0 3060000200053 ENDSUBENT 52 0 3060000299999 SUBENT 30600003 20090729 31403060000300001 BIB 3 5 3060000300002 REACTION (94-PU-240(0,F),PR,NU) 3060000300003 STATUS (TABLE) Data taken from 3060000300004 Chinese J.Nucl.Phys.,2,(1),(1980)29, (page p.37, l.1). 3060000300005 ERR-ANALYS (DATA-ERR) See sub-entry .002. Part of error 3060000300006 estimate is valid. 3060000300007 ENDBIB 5 0 3060000300008 NOCOMMON 0 0 3060000300009 DATA 2 1 3060000300010 DATA DATA-ERR 3060000300011 PRT/FIS PRT/FIS 3060000300012 2.1370E+00 1.7000E-02 3060000300013 ENDDATA 3 0 3060000300014 ENDSUBENT 13 0 3060000399999 ENDENTRY 3 0 3060099999999