ENTRY 23520 20190604 228023520 0 1 SUBENT 23520001 20190603 228023520 1 1 BIB 8 10 23520 1 2 TITLE The pile neutron absorption cross sections of bismuth 23520 1 3 AUTHOR (D.J.Littler, E.E.Lockett) 23520 1 4 REFERENCE (J,PPS/A,66,700,1953) 23520 1 5 INSTITUTE (2UK HAR) 23520 1 6 FACILITY (REAC,2UK HAR) 23520 1 7 COMMENT Of compiler. Incident neutron energy value is not 23520 1 8 given in the article, assumed by compiler as 0.0253 eV 23520 1 9 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 23520 1 10 article. 23520 1 11 HISTORY (20190604C) M.M. 23520 1 12 ENDBIB 10 0 23520 1 13 NOCOMMON 0 0 23520 1 14 ENDSUBENT 13 0 23520 199999 SUBENT 23520002 20190604 228023520 2 1 BIB 10 45 23520 2 2 REACTION (83-BI-209(N,G)83-BI-210,,SIG,,SPA) 23520 2 3 INC-SPECT Predominantly thermal spectrum of pile neutrons 23520 2 4 METHOD Pile oscillator method, G.I.E.E.P. oscillator was 23520 2 5 used. 23520 2 6 Impurities, ppm (full chemical analysis) in sample 23520 2 7 after the pile measurements: 23520 2 8 Gd < 0.01 Dy <0.02 Na 2+-0.3 23520 2 9 B 0.05+-0.005 Pb 15+-2 Ni 1.5+--0.3 23520 2 10 Cd 0.25+-0.025 Zn 8+-1 Sn 1+-0.1 23520 2 11 Li <0.1 Sb 5+-0.25 Fe <5 23520 2 12 Sm <0.03 Si 5+-0.5 As <1 23520 2 13 Eu <0.01 Ca 5+-1 Mn <1 23520 2 14 Ag 10+-1 Cu 4+-0.4 Co <1 23520 2 15 In <1 Mo 4+-0.2 Cr <0.5 23520 2 16 Cl 20+-4 23520 2 17 REL-REF (M,,F.C.W.Colmer+,J,NUC,8,3,1951) 23520 2 18 (M,,P.Benoist+,J,JPR,12,584,1951) 23520 2 19 . A.Langsdorf, Atomic Energy Commission Declassified 23520 2 20 Report 3194, 1951 23520 2 21 . Littler, Atomics,v.1,P.189,1950 23520 2 22 Four refs. for method details. 23520 2 23 MONITOR ((MONIT)5-B-0(N,ABS),,SIG) 23520 2 24 ASSUMED (ASSUM,7-N-0(N,ABS),,SIG) Used for correction. 23520 2 25 COMMENT Of authors. In the pile neutron spectrum the (n,gamma) 23520 2 26 CS is much greater than 23520 2 27 (n,p) (energy release 0.147+-0.01MeV), 23520 2 28 (n,alpha) (energy release 9.23+-0.02 MeV), 23520 2 29 (n,2n) (threshold 7.2+0.1MeV) CSs, 23520 2 30 (n,p) and (n,alpha) CS were estimated at 3MeV energy 23520 2 31 to be of order 3*10**-7 b, 23520 2 32 so measured absorption CS is almost identical to 23520 2 33 (n,gamma) CS. 23520 2 34 CORRECTION For scattering - negligible. 23520 2 35 For "slowing down" - measured by heavy water- +0.7 mb 23520 2 36 in measured CS. 23520 2 37 For allowance of displacement of air by sample at 23520 2 38 moving in the center of pile, nitrogen CS was used, 23520 2 39 correction 2.6 mb. 23520 2 40 For impurities contribution - 6.9+2.4-0.8 mb, 23520 2 41 rewritten as 7.7+-1.6 mb. 23520 2 42 ADD-RES Raw value of CS obtained in measurement with other 23520 2 43 sample(lent by B.B.Kinsey Atomic Energy of Canada,Ltd.)23520 2 44 is 34.3 mb (no corrections applied). 23520 2 45 STATUS (TABLE) Abstract and text on page 701 of 23520 2 46 Proc.Phys.Soc.A,v.66,p.700,1953 23520 2 47 ENDBIB 45 0 23520 2 48 COMMON 2 3 23520 2 49 MONIT ASSUM 23520 2 50 B B 23520 2 51 710. 1.76 23520 2 52 ENDCOMMON 3 0 23520 2 53 DATA 3 1 23520 2 54 EN-DUMMY DATA DATA-ERR 23520 2 55 EV MB MB 23520 2 56 0.0253 30.8 2.2 23520 2 57 ENDDATA 3 0 23520 2 58 ENDSUBENT 57 0 23520 299999 SUBENT 23520003 20190604 228023520 3 1 BIB 10 22 23520 3 2 REACTION 1(83-BI-209(N,G)83-BI-210-G,,SIG,,SPA) 23520 3 3 2((83-BI-209(N,G)83-BI-210-G,,SIG,,SPA)/ 23520 3 4 (11-NA-23(N,G)11-NA-24,,SIG,,SPA)) 23520 3 5 MONITOR 1(11-NA-23(N,G)11-NA-24,,SIG,,SPA) 23520 3 6 SAMPLE Three Bi discs (~0.4 mg/cm2) on Al. Irradiated with 23520 3 7 a sample of sodium carbonate. 23520 3 8 INC-SPECT Predominantly thermal spectrum of pile neutrons 23520 3 9 METHOD (ACTIV) After irradiation in the G.L.E.E.P., 23520 3 10 Na-24 activity was counted by coincidence method of 23520 3 11 J.L.Putman, Brit.J.Radiol.,v.23,p.46,1950. 23520 3 12 Bi discs were kept several weeks (to allow decay of 23520 3 13 Bi-210 -> Po-210), then counted in alpha-counter. 23520 3 14 DETECTOR Argon-filled 2PI alpha counter 23520 3 15 DECAY-DATA (84-PO-210,140.D,A) 23520 3 16 (83-BI-210-G,5.D) 23520 3 17 RAD-DET (84-PO-210,A) 23520 3 18 CORRECTION Alpha-activity of original sample was negligible. 23520 3 19 STATUS (TABLE) Text on page 703 of 23520 3 20 Proc.Phys.Soc.A,v.66,p.700,1953 23520 3 21 This Subent supersedes (as newer publication) 23520 3 22 Subent 21362.007 (previously quoted) 23520 3 23 (COREL,23520004) Data from beta spectrometry 23520 3 24 ENDBIB 22 0 23520 3 25 COMMON 1 3 23520 3 26 EN-DUMMY 23520 3 27 EV 23520 3 28 0.0253 23520 3 29 ENDCOMMON 3 0 23520 3 30 DATA 6 1 23520 3 31 DATA 1DATA-ERR 1MONIT 1MONIT-ERR 1DATA 2DATA-ERR 223520 3 32 MB MB B B NO-DIM NO-DIM 23520 3 33 20.5 1.5 0.50 0.015 0.0410 0.0027 23520 3 34 ENDDATA 3 0 23520 3 35 ENDSUBENT 34 0 23520 399999 SUBENT 23520004 20190604 228023520 4 1 BIB 9 12 23520 4 2 REACTION (83-BI-209(N,G)83-BI-210-G,,SIG,,SPA) 23520 4 3 MONITOR (11-NA-23(N,G)11-NA-24,,SIG,,SPA) 23520 4 4 SAMPLE No information in the article 23520 4 5 METHOD (ACTIV) Irradiation in the B.E.P.O 23520 4 6 DETECTOR (D4PI) 4PI counter for beta-disintegration rate 23520 4 7 detection for Na-24 and Bi-210 23520 4 8 DECAY-DATA (83-BI-210-G,5.D,B) 23520 4 9 CORRECTION Small correction for Bi sample impurities . 23520 4 10 ANALYSIS Mean value of two measurements at B.E.P.O. 23520 4 11 STATUS (TABLE) Text on page 703 of 23520 4 12 Proc.Phys.Soc.A,v.66,p.700,1953 23520 4 13 (COREL,23520003) Data from alpha spectrometry 23520 4 14 ENDBIB 12 0 23520 4 15 COMMON 1 3 23520 4 16 EN-DUMMY 23520 4 17 EV 23520 4 18 0.0253 23520 4 19 ENDCOMMON 3 0 23520 4 20 DATA 4 1 23520 4 21 DATA DATA-ERR MONIT MONIT-ERR 23520 4 22 MB MB B B 23520 4 23 20.4 1.6 0.50 0.015 23520 4 24 ENDDATA 3 0 23520 4 25 ENDSUBENT 24 0 23520 499999 SUBENT 23520005 20190604 228023520 5 1 BIB 4 9 23520 5 2 REACTION (83-BI-209(N,G)83-BI-210-G,,SIG,,SPA) 23520 5 3 MONITOR (11-NA-23(N,G)11-NA-24,,SIG,,SPA) 23520 5 4 ANALYSIS Final value was obtained from two measurements - 23520 5 5 at B.E.P.O. and G.I.E.E.P. , beta and alpha counting, 23520 5 6 respectively. 23520 5 7 STATUS (TABLE) Abstract and text on page 703 of 23520 5 8 Proc.Phys.Soc.A,v.66,p.700,1953 23520 5 9 (DEP,23520003) G.I.E.E.P., alpha counting, 23520 5 10 (DEP,23520004) B.E.P.O., beta counting 23520 5 11 ENDBIB 9 0 23520 5 12 COMMON 1 3 23520 5 13 EN-DUMMY 23520 5 14 EV 23520 5 15 0.0253 23520 5 16 ENDCOMMON 3 0 23520 5 17 DATA 4 1 23520 5 18 DATA DATA-ERR MONIT MONIT-ERR 23520 5 19 MB MB B B 23520 5 20 20.5 1.1 0.50 0.015 23520 5 21 ENDDATA 3 0 23520 5 22 ENDSUBENT 21 0 23520 599999 SUBENT 23520006 20190604 228023520 6 1 BIB 3 8 23520 6 2 REACTION (83-BI-209(N,G)83-BI-210-M,,SIG,,SPA) 23520 6 3 CS of long-lived alpha-emitting Bi-210 state 23520 6 4 production 23520 6 5 ANALYSIS Derived as difference of Subent 002 and Subent 003 23520 6 6 data. 23520 6 7 STATUS (TABLE) Abstract of Proc.Phys.Soc.A,v.66,p.700,1953 23520 6 8 (DEP,23520002) BI-209(N,ABS) CS 23520 6 9 (DEP,23520005) BI-209(N,G)Bi-210 CS 23520 6 10 ENDBIB 8 0 23520 6 11 NOCOMMON 0 0 23520 6 12 DATA 3 1 23520 6 13 EN-DUMMY DATA DATA-ERR 23520 6 14 EV MB MB 23520 6 15 0.0253 10.3 2.5 23520 6 16 ENDDATA 3 0 23520 6 17 ENDSUBENT 16 0 23520 699999 ENDENTRY 6 0 2352099999999