ENTRY 21465 20120819 22322146500000001 SUBENT 21465001 20120819 22322146500100001 BIB 12 31 2146500100002 INSTITUTE (2AUSATI) 2146500100003 REFERENCE (R,INDC(AUS)-4,197912) 2146500100004 AUTHOR (F.Bensch,H.Jasicek) 2146500100005 TITLE The fast neutron emission spectrum of Cf-252 2146500100006 FACILITY .No information given. 2146500100007 SAMPLE The IAEA Cf-252 neutron source consists of 2146500100008 a cylindrical capsule with an outer length of 22.0 2146500100009 mm and an external diameter of 2.80 mm, strength 2146500100010 calibrated against a standard Cf-252 source. 2146500100011 METHOD (REC) Measuring proton-recoils in the gas filled 2146500100012 proportional counter spectrometers. 2146500100013 DETECTOR (PROPC) A gas filled proportional counter filled 2146500100014 with 200 kPa C-H4 gas, 200 kPa kripton gas and 0.1% 2146500100015 He-3, energy calibrated with a Na-Be neutron source 2146500100016 and the He-3(N,P)-reaction using thermal neutrons. 2146500100017 ANALYSIS .The response functions for the detector were calcu- 2146500100018 lated using the Monte-Carlo code MATRI, which is a 2146500100019 modified version of the code SPEC-4. 2146500100020 STATUS .Results taken from INDC(AUS)-4,,197912 2146500100021 CORRECTION .Correction for the high energy part of the Cf-252 2146500100022 neutrons above 10 MeV applied. 2146500100023 .No gamma discrimination applied, since the lower 2146500100024 detection threshold is 0.9 MeV. 2146500100025 HISTORY (19800317C) CN. 2146500100026 (19800331E) 2146500100027 (20110725A) Date is corrected to 8 digit format. Upper 2146500100028 case converted to lower case. REACTION code corrected2146500100029 according to MEMO CP-D/635. SUBENT with PFNS Maxwell 2146500100030 temperature added 2146500100031 (20120819A) SD: E-MIN/-MAX was deleted from COMMON (not2146500100032 applicable).2146500100033 ENDBIB 31 0 2146500100034 NOCOMMON 0 0 2146500100035 ENDSUBENT 34 0 2146500199999 SUBENT 21465002 20110725 22272146500200001 BIB 4 18 2146500200002 REACTION (98-CF-252(0,F),PR,NU/DE) 2146500200003 COMMENT .Raw data were fitted to a polynomial of fourth 2146500200004 order using the expression: 2146500200005 N(e) = K*(sqrt(E)*exp(-E/T)*(sum(a(I)*E**(I))) 2146500200006 I - 0,1,2,3,4. 2146500200007 Which gave the results, 2146500200008 T = 1.409 +- 0.015 MeV 2146500200009 a(0) = 0.89250 2146500200010 a(1) = -0.36978E-02 2146500200011 a(2) = 0.30352E-01 2146500200012 a(3) = -0.59229E-02 2146500200013 a(4) = 0.29983E-03 2146500200014 STATUS Spectrum parameters taken from Table 1 of 2146500200015 INDC(AUS)-4,,197912 and from a corrigendum received 2146500200016 in March 1980 (see comment). 2146500200017 HISTORY (20110725A) REACTION code changed from PR,DE,N to 2146500200018 PR,NU/DE. Expression in COMMENT keyword corrected 2146500200019 from a(I)*e(I) to a(I)*E**(I))) 2146500200020 ENDBIB 18 0 2146500200021 NOCOMMON 0 0 2146500200022 NODATA 0 0 2146500200023 ENDSUBENT 22 0 2146500299999 SUBENT 21465003 20110725 22272146500300001 BIB 5 13 2146500300002 REACTION (98-CF-252(0,F)0-NN-1,PR,KEM) Maxwell distribution 2146500300003 temperature applied in prompt neutron fission 2146500300004 spectrum approximation, SAN 002 2146500300005 ANALYSIS .Data obtained by integration of the expression for 2146500300006 energy spectrum given under COMMENT keyword in 2146500300007 SUBENT 21465002 2146500300008 ERR-ANALYS (DATA-ERR).Errors in the neutron spectrum includes 2146500300009 statistical and systematic errors due to the MONTE- 2146500300010 CARLO method used to obtain the response functions 2146500300011 of the detector. 2146500300012 STATUS (TABLE) Table 1 from INDC(AUS)-4, 197912, page 19 2146500300013 (DEP,21465002) 2146500300014 HISTORY (20110725C) Maxwell distribution temperature compiled 2146500300015 ENDBIB 13 0 2146500300016 NOCOMMON 0 0 2146500300017 DATA 2 1 2146500300018 DATA DATA-ERR 2146500300019 MEV MEV 2146500300020 1.409 0.015 2146500300021 ENDDATA 3 0 2146500300022 ENDSUBENT 21 0 2146500399999 ENDENTRY 3 0 2146599999999