ENTRY 30670 20220823 32083067000000001 SUBENT 30670001 20220823 32083067000100001 BIB 13 60 3067000100002 TITLE The absolute measurement of fast neutron fission cross 3067000100003 section of 239Pu 3067000100004 AUTHOR (Zhou Xianjian, Yan Wuguang, Zhou Huiming, Deng Xinlu, 3067000100005 Rong Chaofan, Wu Jingxia, Sun Zhongfa, Zhou Shuhua, 3067000100006 Ye Zhongyuan) 3067000100007 INSTITUTE (3CPRAEP) 3067000100008 REFERENCE (J,CNP,4,131,1982) in Chinese, data in fig 3067000100009 (C,82ANTWER,,36,1982) data in fig 3067000100010 (R,HSJ-82291,4,1982) in Chinese, data in table 3067000100011 FACILITY (VDG,3CPRAEP) 2.5 MV Van de Graaff accelerator 3067000100012 INC-SOURCE (P-T) for En=1.0 to 1.6 MeV 3067000100013 (D-D) for En=3.4 to 5.6 MeV 3067000100014 SAMPLE 239Pu (20 um thick) electrodeposited on a Pt backing 3067000100015 (40 mm diam., 20 um thick). 3067000100016 The mass of 239Pu 3067000100017 (~1 gram) was determined by residue weighing. 3067000100018 (94-PU-239,ENR=0.969) 96.9+/-0.8% 3067000100019 (94-PU-240,ENR=0.030) 3.0+/-0.5% 3067000100020 (94-PU-241,ENR=0.001) 0.1+/-0.1% 3067000100021 METHOD Recoil proton telescope and the deposit of Pu-239 and 3067000100022 the mylar film are put in a back-to-back geometry in 3067000100023 the fission chamber. 3067000100024 DETECTOR (FISCH) 3067000100025 (TELES,SIBAR,SIBAR) Recoil proton telescope. 3067000100026 Two polyethylene films (5.3269 and 3.9358 mg/cm2 thick)3067000100027 used at 3.4 - 5.6 MeV, and two polypropylene films 3067000100028 (0.74345 and 0.47453 mg/cm2 thick) at 1.0-1.6 MeV. 3067000100029 (LONGC) to monitor neutron yields at 0 and 30 deg. 3067000100030 CORRECTION Corrected for 3067000100031 - effect of 240,241Pu impurities 3067000100032 - hydrogen number quantification 3067000100033 - sample self-absorption 3067000100034 - effective radius 3067000100035 - fission ionization chamber efficiency 3067000100036 - recoil proton spectrum 3067000100037 - neutron scattering 3067000100038 - neutron transmission loss 3067000100039 ERR-ANALYS (ERR-T) Total uncertainty consisting of 3067000100040 (ERR-1) Effect of 240,241Pu impurities (0.8%) 3067000100041 (ERR-2) Hydrogen number quantification (1.15%-1.50%) 3067000100042 (ERR-3) Number of 239Pu (0.6%) 3067000100043 (ERR-4) Telescope efficiency (n-p cross section 3067000100044 and geometry) (0.9%) 3067000100045 (ERR-5) Fission ionization chamber efficiency (1.0%) 3067000100046 (ERR-6,0.0,0.2) Recoil proton spectrum (0.0-0.2%) 3067000100047 (ERR-7) Neutron scattering (0.0-0.2%) 3067000100048 (ERR-8) D-D autogeny neutron target (0.0-1.0%) 3067000100049 (ERR-9,0.0,2.0) Instability (0.0-2.0%) 3067000100050 STATUS (TABLE) Table 1 of Report HSJ-82291,p4 (1982) 3067000100051 HISTORY (19831207R) Data from Yuan Hanrong as priv.comm. 3067000100052 (19831208C) KO 3067000100053 (19850215U) OS. Country code corrected. 3067000100054 (19870210U) New reference added, which translated 3067000100055 mainly from (J,CNP,4,(2),131,8205). The old reference 3067000100056 was corrected. -WD- 3067000100057 (19881114U) WD. Reference added. 3067000100058 (20090725A) SD:Updated to new date formats,lower case. 3067000100059 Description for detector and uncertainties were added.3067000100060 (20170724A) On. ERR-ANALYS updated. Major rev. in 002. 3067000100061 (20220823U) On. CORRECTION and ERR-ANALYS modified. 3067000100062 ENDBIB 60 0 3067000100063 COMMON 4 3 3067000100064 ERR-1 ERR-3 ERR-4 ERR-5 3067000100065 PER-CENT PER-CENT PER-CENT PER-CENT 3067000100066 0.8 0.6 0.9 1.0 3067000100067 ENDCOMMON 3 0 3067000100068 ENDSUBENT 67 0 3067000199999 SUBENT 30670002 20170724 31803067000200001 BIB 3 4 3067000200002 REACTION (94-PU-239(N,F),,SIG) 3067000200003 MONITOR (1-H-1(N,EL)1-H-1,,SIG) 3067000200004 HISTORY (20170724A) On. MONITOR and ERR-2 added. %-uncertainty 3067000200005 adopted for ERR-T. 3067000200006 ENDBIB 4 0 3067000200007 NOCOMMON 0 0 3067000200008 DATA 6 16 3067000200009 EN DATA ERR-T ERR-2 ERR-7 ERR-8 3067000200010 MEV B PER-CENT PER-CENT PER-CENT PER-CENT 3067000200011 1.0 1.860 2.7 1.50 0.2 3067000200012 1.2 1.876 2.7 1.50 0.2 3067000200013 1.4 1.984 2.7 1.50 0.2 3067000200014 1.6 1.958 2.7 1.50 0.2 3067000200015 3.4 1.852 2.9 1.15 1.0 3067000200016 3.6 1.824 2.9 1.15 1.0 3067000200017 3.8 1.825 2.9 1.15 1.0 3067000200018 4.0 1.796 2.9 1.15 1.0 3067000200019 4.2 1.781 2.9 1.15 1.0 3067000200020 4.4 1.767 2.9 1.15 1.0 3067000200021 4.6 1.756 2.9 1.15 1.0 3067000200022 4.8 1.698 2.9 1.15 1.0 3067000200023 5.0 1.696 2.9 1.15 1.0 3067000200024 5.2 1.664 2.9 1.15 1.0 3067000200025 5.4 1.660 2.9 1.15 1.0 3067000200026 5.6 1.683 2.9 1.15 1.0 3067000200027 ENDDATA 18 0 3067000200028 ENDSUBENT 27 0 3067000299999 ENDENTRY 2 0 3067099999999