ENTRY 32510 20100328 31473251000000001 SUBENT 32510001 20100328 31473251000100001 BIB 13 46 3251000100002 TITLE The prompt neutron energy spectrum from the 3251000100003 spontaneous fission of Cf-252 3251000100004 INSTITUTE (3CPRAEP) 3251000100005 REFERENCE (J,CNP,10,(4),346,198811)In Chinese 3251000100006 AUTHOR (Meng Jingchen,Shen Guanren,Huang Tangzi,Han Honyin, 3251000100007 Li Anli) 3251000100008 METHOD (TOF)Flight path were 2.0,2.5 and 3.0 m respectively, 3251000100009 zero-time signal from fission fragment,while neutron 3251000100010 timing signal was obtained from a fast response 3251000100011 neutron detector 3251000100012 DETECTOR (SCIN) 3251000100013 1: liquid scintillator (thickness=50mm , 3251000100014 diameter=104mm) and XP2040 photo-multiplier for neutro 3251000100015 detection 3251000100016 2: plastic scintillator (thickness=4.5 micro meter, 3251000100017 diameter=30mm) and 56AVP photo-multiplier for fission 3251000100018 fragment detection 3251000100019 SAMPLE Electro-plated Cf-252,diameter=8mm,intensity about 3251000100020 1.2 x 10**5 fission/second 3251000100021 MONITOR (1-H-1(N,EL)1-H-1,,SIG) 3251000100022 PART-DET (PN)Prompt neutrons from spontaneous fission 3251000100023 (SF)fragment from spontaneous fission 3251000100024 ANALYSIS Energy spectrum of prompt neutrons from Cf-252 3251000100025 spontaneous fission was measured for energy range 0.9 3251000100026 to 14.5 MeV. Three data sets obtained from different 3251000100027 flight path were fitted to a 'Maxwellian distribution' 3251000100028 respectively, and the weighted average value was 3251000100029 t=1.418+-0.015 MeV. 3251000100030 CORRECTION Correction applied for: 3251000100031 1:random background 3251000100032 2:scattering background 3251000100033 3:delayed gamma ray and delayed neutron effect 3251000100034 4:channel shift effect 3251000100035 STATUS (TABLE) Data taken from Table 2 of Chin. J.Phys,10,(4),3251000100036 346,1988. This result slightly differs from earlier 3251000100037 work of the same author,see Chin.J.Phys,3,(2),163,1981,3251000100038 also see EXFOR30610, in which the average energy was 3251000100039 given. This entry replaces the earlier entry 30610 3251000100040 HISTORY (19891227C) Compiled by Yu Hong wei and Liang Qichang 3251000100041 (19920924A) data in subent 2 multiplied with 3/2, ac- 3251000100042 cording to: AKE = T*3/2. comment on replacement added 3251000100043 under status. 3251000100044 (19930524U) HW.-Free text removed in subent 002.- 3251000100045 (20100328A) SD: Updated to new date formats,lower case.3251000100046 REACTION code in Subent 002 was changed 3251000100047 according to EXFOR rules. 3251000100048 ENDBIB 46 0 3251000100049 NOCOMMON 0 0 3251000100050 ENDSUBENT 49 0 3251000199999 SUBENT 32510002 20100328 31473251000200001 BIB 2 4 3251000200002 REACTION (98-CF-252(0,F)0-NN-1,PR,KE) 3251000200003 HISTORY (19930525U) HW.-Free text removed.- 3251000200004 (20100328A) SD: REACTION code was changed 3251000200005 according to EXFOR rules. 3251000200006 ENDBIB 4 0 3251000200007 NOCOMMON 0 0 3251000200008 DATA 2 1 3251000200009 DATA DATA-ERR 3251000200010 MEV MEV 3251000200011 2.127 0.0225 3251000200012 ENDDATA 3 0 3251000200013 ENDSUBENT 12 0 3251000299999 ENDENTRY 2 0 3251099999999