ENTRY 40637 20231006 421540637 0 1 SUBENT 40637001 20231006 421540637 1 1 BIB 14 27 40637 1 2 TITLE Cross section for the reaction Th232(n,2n)Th231 40637 1 3 at 14.7 MeV neutron energy 40637 1 4 AUTHOR (Yu.A.Zysin,A.A.Kovrizhnykh,A.A.Lbov,L.I.Sel'chenkov) 40637 1 5 REFERENCE (J,SJA,8,310,1961) Engl.translation of AE,8,360,1960 40637 1 6 (J,AE,8,360,1960) Issue 4. 40637 1 7 INSTITUTE (4RUSKUR) 40637 1 8 EXP-YEAR (1956) 1956 - 1957 years. 40637 1 9 FACILITY (LINAC,4RUSKUR) Low-voltage linear accelerator. 40637 1 10 INC-SOURCE (D-T) Deuteron energy ~ 150 keV. 40637 1 11 SAMPLE Mixture of the thorium nitrate Th(NO(3))(4)*4H(2)O 40637 1 12 (0.2 g) and uranium oxide U(3)O(8) (0.6 g). 40637 1 13 Placed at ~ 7 mm distance from tritium target center. 40637 1 14 METHOD (ACTIV) Six irradiations, time of irradiation 3-11 hr. 40637 1 15 (CHSEP) For required isotopes. 40637 1 16 DETECTOR (D4PI) 40637 1 17 ASSUMED (ASSUM1,92-U-238(N,F),,SIG) 40637 1 18 (ASSUM2,92-U-238(N,F)42-MO-99,CUM,FY) 40637 1 19 (ASSUM3,92-U-238(N,F)56-BA-140,CUM,FY) 40637 1 20 PART-DET (B-) 40637 1 21 CORRECTION For disintegration during the irradiation time, 40637 1 22 and for Tc99m and La140. 40637 1 23 For increasing activity of the natural decay products 40637 1 24 of Th232. 40637 1 25 HISTORY (19831011C) Compiled at the centre 40637 1 26 (20231006A) EN-NRM=14.7 MeV was deleted ( the same as 40637 1 27 incident neutron energy EN). 40637 1 28 MONITOR -> ASSUMED . 4RUSRUS -> 4RUKUR 40637 1 29 ENDBIB 27 0 40637 1 30 COMMON 3 3 40637 1 31 ASSUM1 ASSUM2 ASSUM3 40637 1 32 B PC/FIS PC/FIS 40637 1 33 1.1 6.3 4.7 40637 1 34 ENDCOMMON 3 0 40637 1 35 ENDSUBENT 34 0 40637 199999 SUBENT 40637002 20231006 421540637 2 1 BIB 4 19 40637 2 2 REACTION (90-TH-232(N,2N)90-TH-231,,SIG) 40637 2 3 ANALYSIS Formula for n,2n cross section calculation is given 40637 2 4 on page 310 of SJA,8,310,1961: 40637 2 5 SIGn,2n=((Nth*HLth)/(Nmo*HLmo))* 40637 2 6 (SIGufis*Ymou*(232Pu/238Pth)+SIGthfis*Ymoth)), 40637 2 7 where 40637 2 8 SIGufis, SIGthfis - fission cross-section for U238 and 40637 2 9 Th232 at 14 MeV; 40637 2 10 HLth, HLmo - half-life of Th231 and Mo99 (or Ba140); 40637 2 11 Nth, Nmo - number of Th231, Mo99 (or Ba140) 40637 2 12 disintegrations per time unit at the end irradiation 40637 2 13 and referred to the total amounts of Th232 and U-238; 40637 2 14 Ymou, YYmoth - Mo ( or Ba) yield at fission of U238 and40637 2 15 Th232 at 14 MeV; 40637 2 16 Pth, Pu - weights of Th232 and U238. 40637 2 17 ERR-ANALYS (DATA-ERR) Includes statistical uncertainty and 40637 2 18 uncertainties of fission cross sections and fragment 40637 2 19 yields. 40637 2 20 STATUS (TABLE,,Yu.A.Zysin+,J,SJA,8,310,1961) Text page 310. 40637 2 21 ENDBIB 19 0 40637 2 22 NOCOMMON 0 0 40637 2 23 DATA 3 1 40637 2 24 EN DATA DATA-ERR 40637 2 25 MEV B B 40637 2 26 14.7 0.65 0.15 40637 2 27 ENDDATA 3 0 40637 2 28 ENDSUBENT 27 0 40637 299999 ENDENTRY 2 0 4063799999999