ENTRY 14702 20210421 14841470200000001 SUBENT 14702001 20210421 14841470200100001 BIB 10 16 1470200100002 TITLE Inelastic Scattering of Fast Neutrons 1470200100003 AUTHOR (G.T.Seaborg,G.E.Gibson,D.C.Grahame) 1470200100004 REFERENCE (J,PR,52,408,1937) 1470200100005 #doi:10.1103/PhysRev.52.408 1470200100006 INSTITUTE (1USAUCX) 1470200100007 INC-SOURCE (RA-BE) The source of neutrons (Be+200 mg Ra). 1470200100008 DETECTOR (GEMUC) A steel Geiger-Muller counter of dimensions 1470200100009 3.7 cm x 12 cm with a wall thickness of 0.20 mm and 1470200100010 filled with argon to a pressure of 15 cm Hg was 1470200100011 surrounded with a lead foil (1.0 g/cm2). 1470200100012 SAMPLE The absorbing cylinders used in these experiments 1470200100013 were 17.8 cm long and approximately 10 cm in diameter. 1470200100014 ERR-ANALYS (DATA-ERR) Probable errors. 1470200100015 COMMENT Compiler's comment: Ra-Be neutron spectrum is below 1470200100016 13 MeV. 1470200100017 HISTORY (20210421C) BP 1470200100018 ENDBIB 16 0 1470200100019 COMMON 1 3 1470200100020 EN-MAX 1470200100021 MEV 1470200100022 13.0 1470200100023 ENDCOMMON 3 0 1470200100024 ENDSUBENT 23 0 1470200199999 SUBENT 14702002 20210421 14841470200200001 BIB 4 19 1470200200002 REACTION (6-C-0(N,TOT),,TRN,,SPA) 1470200200003 METHOD (TRN) The absorption of fast neutrons has been 1470200200004 measured with cylindrical absorbers to minimize the 1470200200005 loss of neutrons by scattering and with a method of 1470200200006 detection which made any change in the energy 1470200200007 spectrum of the fast neutrons relatively unimportant. 1470200200008 The fast neutrons were detected by slowing them in 1470200200009 5.7 cm of paraffin at 8 and counting by means of a 1470200200010 Geiger-Muller counter the gamma-rays produced by the 1470200200011 absorption of these slow neutrons in cadmium and lead. 1470200200012 COMMENT Compiler's comment: calculated as 4.1cm x 1.3 g/cm3. 1470200200013 Transmission is normally smaller than 1 (or only 1470200200014 slightly bigger when an error of suitable size is 1470200200015 given, or when it is raw data), but here we have 1470200200016 values bigger than 1, authors explain it by saying 1470200200017 that fast neutrons slowed down in the absorbers may 1470200200018 result in more neutrons coming out. This means 1470200200019 something like a (n,2n) reaction in the absorber. 1470200200020 STATUS (TABLE) Table I, page 411. 1470200200021 ENDBIB 19 0 1470200200022 COMMON 1 3 1470200200023 THICKNESS 1470200200024 G/CM-SQ 1470200200025 5.33 1470200200026 ENDCOMMON 3 0 1470200200027 DATA 2 1 1470200200028 DATA DATA-ERR 1470200200029 NO-DIM NO-DIM 1470200200030 1.00 0.02 1470200200031 ENDDATA 3 0 1470200200032 ENDSUBENT 31 0 1470200299999 SUBENT 14702003 20210421 14841470200300001 BIB 4 19 1470200300002 REACTION (13-AL-27(N,TOT),,TRN,,SPA) 1470200300003 METHOD (TRN) The absorption of fast neutrons has been 1470200300004 measured with cylindrical absorbers to minimize the 1470200300005 loss of neutrons by scattering and with a method of 1470200300006 detection which made any change in the energy 1470200300007 spectrum of the fast neutrons relatively unimportant. 1470200300008 The fast neutrons were detected by slowing them in 1470200300009 5.7 cm of paraffin at 8 and counting by means of a 1470200300010 Geiger-Muller counter the gamma-rays produced by the 1470200300011 absorption of these slow neutrons in cadmium and lead. 1470200300012 COMMENT Compiler's comment: calculated as 4.2cm x 2.7 g/cm3. 1470200300013 Transmission is normally smaller than 1 (or only 1470200300014 slightly bigger when an error of suitable size is 1470200300015 given, or when it is raw data), but here we have 1470200300016 values bigger than 1, authors explain it by saying 1470200300017 that fast neutrons slowed down in the absorbers may 1470200300018 result in more neutrons coming out. This means 1470200300019 something like a (n,2n) reaction in the absorber. 1470200300020 STATUS (TABLE) Table I, page 411. 1470200300021 ENDBIB 19 0 1470200300022 COMMON 1 3 1470200300023 THICKNESS 1470200300024 G/CM-SQ 1470200300025 11.34 1470200300026 ENDCOMMON 3 0 1470200300027 DATA 2 1 1470200300028 DATA DATA-ERR 1470200300029 NO-DIM NO-DIM 1470200300030 1.03 0.02 1470200300031 ENDDATA 3 0 1470200300032 ENDSUBENT 31 0 1470200399999 SUBENT 14702004 20210421 14841470200400001 BIB 4 20 1470200400002 REACTION (16-S-0(N,TOT),,TRN,,SPA) 1470200400003 METHOD (TRN) The absorption of fast neutrons has been 1470200400004 measured with cylindrical absorbers to minimize the 1470200400005 loss of neutrons by scattering and with a method of 1470200400006 detection which made any change in the energy 1470200400007 spectrum of the fast neutrons relatively unimportant. 1470200400008 The fast neutrons were detected by slowing them in 1470200400009 5.7 cm of paraffin at 8 and counting by means of a 1470200400010 Geiger-Muller counter the gamma-rays produced by the 1470200400011 absorption of these slow neutrons in cadmium and lead. 1470200400012 COMMENT Compiler's comment: calculated as 4.0cm x 2.0 g/cm3, 1470200400013 modern value is 2.07 g/cm3. 1470200400014 Transmission is normally smaller than 1 (or only 1470200400015 slightly bigger when an error of suitable size is 1470200400016 given, or when it is raw data), but here we have 1470200400017 values bigger than 1, authors explain it by saying 1470200400018 that fast neutrons slowed down in the absorbers may 1470200400019 result in more neutrons coming out. This means 1470200400020 something like a (n,2n) reaction in the absorber. 1470200400021 STATUS (TABLE) Table I, page 411. 1470200400022 ENDBIB 20 0 1470200400023 COMMON 1 3 1470200400024 THICKNESS 1470200400025 G/CM-SQ 1470200400026 8.0 1470200400027 ENDCOMMON 3 0 1470200400028 DATA 2 1 1470200400029 DATA DATA-ERR 1470200400030 NO-DIM NO-DIM 1470200400031 0.99 0.02 1470200400032 ENDDATA 3 0 1470200400033 ENDSUBENT 32 0 1470200499999 SUBENT 14702005 20210421 14841470200500001 BIB 5 20 1470200500002 REACTION (6-C-CMP(N,TOT),,TRN,,SPA) CCl4. 1470200500003 SAMPLE CCl4 1470200500004 METHOD (TRN) The absorption of fast neutrons has been 1470200500005 measured with cylindrical absorbers to minimize the 1470200500006 loss of neutrons by scattering and with a method of 1470200500007 detection which made any change in the energy 1470200500008 spectrum of the fast neutrons relatively unimportant. 1470200500009 The fast neutrons were detected by slowing them in 1470200500010 5.7 cm of paraffin at 8 and counting by means of a 1470200500011 Geiger-Muller counter the gamma-rays produced by the 1470200500012 absorption of these slow neutrons in cadmium and lead. 1470200500013 COMMENT Compiler's comment: calculated as 4.0cm x 1.59 g/cm3. 1470200500014 Transmission is normally smaller than 1 (or only 1470200500015 slightly bigger when an error of suitable size is 1470200500016 given, or when it is raw data), but here we have 1470200500017 values bigger than 1, authors explain it by saying 1470200500018 that fast neutrons slowed down in the absorbers may 1470200500019 result in more neutrons coming out. This means 1470200500020 something like a (n,2n) reaction in the absorber. 1470200500021 STATUS (TABLE) Table I, page 411. 1470200500022 ENDBIB 20 0 1470200500023 COMMON 1 3 1470200500024 THICKNESS 1470200500025 G/CM-SQ 1470200500026 6.36 1470200500027 ENDCOMMON 3 0 1470200500028 DATA 2 1 1470200500029 DATA DATA-ERR 1470200500030 NO-DIM NO-DIM 1470200500031 0.98 0.02 1470200500032 ENDDATA 3 0 1470200500033 ENDSUBENT 32 0 1470200599999 SUBENT 14702006 20210421 14841470200600001 BIB 4 19 1470200600002 REACTION (26-FE-0(N,TOT),,TRN,,SPA) 1470200600003 METHOD (TRN) The absorption of fast neutrons has been 1470200600004 measured with cylindrical absorbers to minimize the 1470200600005 loss of neutrons by scattering and with a method of 1470200600006 detection which made any change in the energy 1470200600007 spectrum of the fast neutrons relatively unimportant. 1470200600008 The fast neutrons were detected by slowing them in 1470200600009 5.7 cm of paraffin at 8 and counting by means of a 1470200600010 Geiger-Muller counter the gamma-rays produced by the 1470200600011 absorption of these slow neutrons in cadmium and lead. 1470200600012 COMMENT Compiler's comment: calculated as 4.0cm x 7.874 g/cm3. 1470200600013 Transmission is normally smaller than 1 (or only 1470200600014 slightly bigger when an error of suitable size is 1470200600015 given, or when it is raw data), but here we have 1470200600016 values bigger than 1, authors explain it by saying 1470200600017 that fast neutrons slowed down in the absorbers may 1470200600018 result in more neutrons coming out. This means 1470200600019 something like a (n,2n) reaction in the absorber. 1470200600020 STATUS (TABLE) Table I, page 411. 1470200600021 ENDBIB 19 0 1470200600022 COMMON 1 3 1470200600023 THICKNESS 1470200600024 G/CM-SQ 1470200600025 31.496 1470200600026 ENDCOMMON 3 0 1470200600027 DATA 2 1 1470200600028 DATA DATA-ERR 1470200600029 NO-DIM NO-DIM 1470200600030 1.02 0.02 1470200600031 ENDDATA 3 0 1470200600032 ENDSUBENT 31 0 1470200699999 SUBENT 14702007 20210421 14841470200700001 BIB 4 19 1470200700002 REACTION (29-CU-0(N,TOT),,TRN,,SPA) 1470200700003 METHOD (TRN) The absorption of fast neutrons has been 1470200700004 measured with cylindrical absorbers to minimize the 1470200700005 loss of neutrons by scattering and with a method of 1470200700006 detection which made any change in the energy 1470200700007 spectrum of the fast neutrons relatively unimportant. 1470200700008 The fast neutrons were detected by slowing them in 1470200700009 5.7 cm of paraffin at 8 and counting by means of a 1470200700010 Geiger-Muller counter the gamma-rays produced by the 1470200700011 absorption of these slow neutrons in cadmium and lead. 1470200700012 COMMENT Compiler's comment: calculated as 3.4cm x 8.96 g/cm3. 1470200700013 Transmission is normally smaller than 1 (or only 1470200700014 slightly bigger when an error of suitable size is 1470200700015 given, or when it is raw data), but here we have 1470200700016 values bigger than 1, authors explain it by saying 1470200700017 that fast neutrons slowed down in the absorbers may 1470200700018 result in more neutrons coming out. This means 1470200700019 something like a (n,2n) reaction in the absorber. 1470200700020 STATUS (TABLE) Table I, page 411. 1470200700021 ENDBIB 19 0 1470200700022 COMMON 1 3 1470200700023 THICKNESS 1470200700024 G/CM-SQ 1470200700025 30.464 1470200700026 ENDCOMMON 3 0 1470200700027 DATA 2 1 1470200700028 DATA DATA-ERR 1470200700029 NO-DIM NO-DIM 1470200700030 1.05 0.02 1470200700031 ENDDATA 3 0 1470200700032 ENDSUBENT 31 0 1470200799999 SUBENT 14702008 20210421 14841470200800001 BIB 4 20 1470200800002 REACTION (48-CD-0(N,TOT),,TRN,,SPA) 1470200800003 METHOD (TRN) The absorption of fast neutrons has been 1470200800004 measured with cylindrical absorbers to minimize the 1470200800005 loss of neutrons by scattering and with a method of 1470200800006 detection which made any change in the energy 1470200800007 spectrum of the fast neutrons relatively unimportant. 1470200800008 The fast neutrons were detected by slowing them in 1470200800009 5.7 cm of paraffin at 8 and counting by means of a 1470200800010 Geiger-Muller counter the gamma-rays produced by the 1470200800011 absorption of these slow neutrons in cadmium and lead. 1470200800012 COMMENT Compiler's comment: calculated as 4.3cm x 7.3 g/cm3, 1470200800013 modern value is 8.7 g/cm3. 1470200800014 Transmission is normally smaller than 1 (or only 1470200800015 slightly bigger when an error of suitable size is 1470200800016 given, or when it is raw data), but here we have 1470200800017 values bigger than 1, authors explain it by saying 1470200800018 that fast neutrons slowed down in the absorbers may 1470200800019 result in more neutrons coming out. This means 1470200800020 something like a (n,2n) reaction in the absorber. 1470200800021 STATUS (TABLE) Table I, page 411. 1470200800022 ENDBIB 20 0 1470200800023 COMMON 1 3 1470200800024 THICKNESS 1470200800025 G/CM-SQ 1470200800026 31.39 1470200800027 ENDCOMMON 3 0 1470200800028 DATA 2 1 1470200800029 DATA DATA-ERR 1470200800030 NO-DIM NO-DIM 1470200800031 1.00 0.02 1470200800032 ENDDATA 3 0 1470200800033 ENDSUBENT 32 0 1470200899999 SUBENT 14702009 20210421 14841470200900001 BIB 4 19 1470200900002 REACTION (82-PB-0(N,TOT),,TRN,,SPA) 1470200900003 METHOD (TRN) The absorption of fast neutrons has been 1470200900004 measured with cylindrical absorbers to minimize the 1470200900005 loss of neutrons by scattering and with a method of 1470200900006 detection which made any change in the energy 1470200900007 spectrum of the fast neutrons relatively unimportant. 1470200900008 The fast neutrons were detected by slowing them in 1470200900009 5.7 cm of paraffin at 8 and counting by means of a 1470200900010 Geiger-Muller counter the gamma-rays produced by the 1470200900011 absorption of these slow neutrons in cadmium and lead. 1470200900012 COMMENT Compiler's comment: calculated as 4.2cm x 11.35 g/cm3. 1470200900013 STATUS (TABLE) Table I, page 411. 1470200900014 Transmission is normally smaller than 1 (or only 1470200900015 slightly bigger when an error of suitable size is 1470200900016 given, or when it is raw data), but here we have 1470200900017 values bigger than 1, authors explain it by saying 1470200900018 that fast neutrons slowed down in the absorbers may 1470200900019 result in more neutrons coming out. This means 1470200900020 something like a (n,2n) reaction in the absorber. 1470200900021 ENDBIB 19 0 1470200900022 COMMON 1 3 1470200900023 THICKNESS 1470200900024 G/CM-SQ 1470200900025 47.67 1470200900026 ENDCOMMON 3 0 1470200900027 DATA 2 1 1470200900028 DATA DATA-ERR 1470200900029 NO-DIM NO-DIM 1470200900030 1.04 0.02 1470200900031 ENDDATA 3 0 1470200900032 ENDSUBENT 31 0 1470200999999 SUBENT 14702010 20210421 14841470201000001 BIB 4 22 1470201000002 REACTION (6-C-0(N,INL)6-C-0,,SIG,,SPA) 1470201000003 SAMPLE Calculated thickness as 4.1cm x 1.3 g/cm3=5.33 g/cm2. 1470201000004 Transmission is normally smaller than 1 (or only 1470201000005 slightly bigger when an error of suitable size is 1470201000006 given, or when it is raw data), but here we have 1470201000007 values bigger than 1, authors explain it by saying 1470201000008 that fast neutrons slowed down in the absorbers may 1470201000009 result in more neutrons coming out. This means 1470201000010 something like a (n,2n) reaction in the absorber. 1470201000011 METHOD (TRN) Measurements were made alternately with and 1470201000012 without cylindrical absorbers. The counts recorded by 1470201000013 the Geiger-Muller counter (after subtracting the 1470201000014 natura1 background) were due chiefly to gamma-rays 1470201000015 excited in the lead by fast neutrons. When the 1470201000016 cylindrical "absorbers" were placed around the source, 1470201000017 a marked decrease in the counting rate was observed. 1470201000018 In order to show that these effects did not arise 1470201000019 solely from changes, the counter was removed from its 1470201000020 lead housing and placed in a copper cylinder of 2.8 1470201000021 cm wall thickness. Average value Pb and Cu gamma-rays 1470201000022 detection. 1470201000023 STATUS (TABLE) Table II, page 413. 1470201000024 ENDBIB 22 0 1470201000025 NOCOMMON 0 0 1470201000026 DATA 2 1 1470201000027 DATA DATA-ERR 1470201000028 B B 1470201000029 0.12 0.08 1470201000030 ENDDATA 3 0 1470201000031 ENDSUBENT 30 0 1470201099999 SUBENT 14702011 20210421 14841470201100001 BIB 4 22 1470201100002 REACTION (13-AL-27(N,INL)13-AL-27,,SIG,,SPA) 1470201100003 SAMPLE Calculated thickness as 4.2cm x 2.7 g/cm3=11.34 1470201100004 g/cm2. Transmission is normally smaller than 1 (or 1470201100005 only slightly bigger when an error of suitable size 1470201100006 is given, or when it is raw data), but here we have 1470201100007 values bigger than 1, authors explain it by saying 1470201100008 that fast neutrons slowed down in the absorbers may 1470201100009 result in more neutrons coming out. This means 1470201100010 something like a (n,2n) reaction in the absorber. 1470201100011 METHOD (TRN) Measurements were made alternately with and 1470201100012 without cylindrical absorbers. The counts recorded by 1470201100013 the Geiger-Muller counter (after subtracting the 1470201100014 natura1 background) were due chiefly to gamma-rays 1470201100015 excited in the lead by fast neutrons. When the 1470201100016 cylindrical "absorbers" were placed around the source, 1470201100017 a marked decrease in the counting rate was observed. 1470201100018 In order to show that these effects did not arise 1470201100019 solely from changes, the counter was removed from its 1470201100020 lead housing and placed in a copper cylinder of 2.8 1470201100021 cm wall thickness. Average value Pb and Cu gamma-rays 1470201100022 detection. 1470201100023 STATUS (TABLE) Table II, page 413. 1470201100024 ENDBIB 22 0 1470201100025 NOCOMMON 0 0 1470201100026 DATA 2 1 1470201100027 DATA DATA-ERR 1470201100028 B B 1470201100029 0.33 0.09 1470201100030 ENDDATA 3 0 1470201100031 ENDSUBENT 30 0 1470201199999 SUBENT 14702012 20210421 14841470201200001 BIB 4 23 1470201200002 REACTION (16-S-0(N,INL)16-S-0,,SIG,,SPA) 1470201200003 SAMPLE Calculated thickness as 4.0cm x 2.0 g/cm3=8 g/cm2, 1470201200004 modern density value is 2.07 g/cm3. Transmission is 1470201200005 normally smaller than 1 (or only slightly bigger when 1470201200006 an error of suitable size is given, or when it is raw 1470201200007 data), but here we have values bigger than 1, 1470201200008 authors explain it by saying that fast neutrons 1470201200009 slowed down in the absorbers may result in more 1470201200010 neutrons coming out. This means something like a 1470201200011 (n,2n) reaction in the absorber. 1470201200012 METHOD (TRN) Measurements were made alternately with and 1470201200013 without cylindrical absorbers. The counts recorded by 1470201200014 the Geiger-Muller counter (after subtracting the 1470201200015 natura1 background) were due chiefly to gamma-rays 1470201200016 excited in the lead by fast neutrons. When the 1470201200017 cylindrical "absorbers" were placed around the source, 1470201200018 a marked decrease in the counting rate was observed. 1470201200019 In order to show that these effects did not arise 1470201200020 solely from changes, the counter was removed from its 1470201200021 lead housing and placed in a copper cylinder of 2.8 1470201200022 cm wall thickness. Average value Pb and Cu gamma-rays 1470201200023 detection. 1470201200024 STATUS (TABLE) Table II, page 413. 1470201200025 ENDBIB 23 0 1470201200026 NOCOMMON 0 0 1470201200027 DATA 2 1 1470201200028 DATA DATA-ERR 1470201200029 B B 1470201200030 0.58 0.14 1470201200031 ENDDATA 3 0 1470201200032 ENDSUBENT 31 0 1470201299999 SUBENT 14702013 20210421 14841470201300001 BIB 4 22 1470201300002 REACTION (17-CL-0(N,INL)17-CL-0,,SIG,,SPA) 1470201300003 SAMPLE CCl4. Calculated thickness as 4.0cm x 1.59 g/cm3=6.36 1470201300004 g/cm2. Transmission is normally smaller than 1 (or 1470201300005 only slightly bigger when an error of suitable size 1470201300006 is given, or when it is raw data) , but here we have 1470201300007 values bigger than 1, authors explain it by saying 1470201300008 that fast neutrons slowed down in the absorbers may 1470201300009 result in more neutrons coming out. This means 1470201300010 something like a (n,2n) reaction in the absorber. 1470201300011 METHOD (TRN) Measurements were made alternately with and 1470201300012 without cylindrical absorbers. The counts recorded by 1470201300013 the Geiger-Muller counter (after subtracting the 1470201300014 natura1 background) were due chiefly to gamma-rays 1470201300015 excited in the lead by fast neutrons. When the 1470201300016 cylindrical "absorbers" were placed around the source, 1470201300017 a marked decrease in the counting rate was observed. 1470201300018 In order to show that these effects did not arise 1470201300019 solely from changes, the counter was removed from its 1470201300020 lead housing and placed in a copper cylinder of 2.8 1470201300021 cm wall thickness. Average value Pb and Cu gamma-rays 1470201300022 detection. 1470201300023 STATUS (TABLE) Table II, page 413. 1470201300024 ENDBIB 22 0 1470201300025 NOCOMMON 0 0 1470201300026 DATA 2 1 1470201300027 DATA DATA-ERR 1470201300028 B B 1470201300029 0.73 0.21 1470201300030 ENDDATA 3 0 1470201300031 ENDSUBENT 30 0 1470201399999 SUBENT 14702014 20210421 14841470201400001 BIB 4 22 1470201400002 REACTION (26-FE-0(N,INL)26-FE-0,,SIG,,SPA) 1470201400003 SAMPLE Calculated thickness as 4.0cm x 7.874 g/cm3=31.496 1470201400004 g/cm2. Transmission is normally smaller than 1 (or 1470201400005 only slightly bigger when an error of suitable size 1470201400006 is given, or when it is raw data), but here we have 1470201400007 values bigger than 1, authors explain it by saying 1470201400008 that fast neutrons slowed down in the absorbers may 1470201400009 result in more neutrons coming out. This means 1470201400010 something like a (n,2n) reaction in the absorber. 1470201400011 METHOD (TRN) Measurements were made alternately with and 1470201400012 without cylindrical absorbers. The counts recorded by 1470201400013 the Geiger-Muller counter (after subtracting the 1470201400014 natura1 background) were due chiefly to gamma-rays 1470201400015 excited in the lead by fast neutrons. When the 1470201400016 cylindrical "absorbers" were placed around the source, 1470201400017 a marked decrease in the counting rate was observed. 1470201400018 In order to show that these effects did not arise 1470201400019 solely from changes, the counter was removed from its 1470201400020 lead housing and placed in a copper cylinder of 2.8 1470201400021 cm wall thickness. Average value Pb and Cu gamma-rays 1470201400022 detection. 1470201400023 STATUS (TABLE) Table II, page 413. 1470201400024 ENDBIB 22 0 1470201400025 NOCOMMON 0 0 1470201400026 DATA 2 1 1470201400027 DATA DATA-ERR 1470201400028 B B 1470201400029 0.74 0.08 1470201400030 ENDDATA 3 0 1470201400031 ENDSUBENT 30 0 1470201499999 SUBENT 14702015 20210421 14841470201500001 BIB 4 22 1470201500002 REACTION (29-CU-0(N,INL)29-CU-0,,SIG,,SPA) 1470201500003 SAMPLE Calculated thickness as 3.4cm x 8.96 g/cm3=30.464 1470201500004 g/cm2. Transmission is normally smaller than 1 (or 1470201500005 only slightly bigger when an error of suitable size 1470201500006 is given, or when it is raw data), but here we have 1470201500007 values bigger than 1, authors explain it by saying 1470201500008 that fast neutrons slowed down in the absorbers may 1470201500009 result in more neutrons coming out. This means 1470201500010 something like a (n,2n) reaction in the absorber. 1470201500011 METHOD (TRN) Measurements were made alternately with and 1470201500012 without cylindrical absorbers. The counts recorded by 1470201500013 the Geiger-Muller counter (after subtracting the 1470201500014 natura1 background) were due chiefly to gamma-rays 1470201500015 excited in the lead by fast neutrons. When the 1470201500016 cylindrical "absorbers" were placed around the source, 1470201500017 a marked decrease in the counting rate was observed. 1470201500018 In order to show that these effects did not arise 1470201500019 solely from changes, the counter was removed from its 1470201500020 lead housing and placed in a copper cylinder of 2.8 1470201500021 cm wall thickness. Average value Pb and Cu gamma-rays 1470201500022 detection. 1470201500023 STATUS (TABLE) Table II, page 413. 1470201500024 ENDBIB 22 0 1470201500025 NOCOMMON 0 0 1470201500026 DATA 2 1 1470201500027 DATA DATA-ERR 1470201500028 B B 1470201500029 0.94 0.09 1470201500030 ENDDATA 3 0 1470201500031 ENDSUBENT 30 0 1470201599999 SUBENT 14702016 20210421 14841470201600001 BIB 4 23 1470201600002 REACTION (48-CD-0(N,INL)48-CD-0,,SIG,,SPA) 1470201600003 SAMPLE Calculated thickness as 4.3cm x 7.3 g/cm3=31.39 g/cm2, 1470201600004 modern density value is 8.7 g/cm3. Transmission is 1470201600005 normally smaller than 1 (or only slightly bigger when 1470201600006 an error of suitable size is given, or when it is raw 1470201600007 data) , but here we have values bigger than 1, 1470201600008 authors explain it by saying that fast neutrons 1470201600009 slowed down in the absorbers may result in more 1470201600010 neutrons coming out. This means something like a 1470201600011 (n,2n) reaction in the absorber. 1470201600012 METHOD (TRN) Measurements were made alternately with and 1470201600013 without cylindrical absorbers. The counts recorded by 1470201600014 the Geiger-Muller counter (after subtracting the 1470201600015 natura1 background) were due chiefly to gamma-rays 1470201600016 excited in the lead by fast neutrons. When the 1470201600017 cylindrical "absorbers" were placed around the source, 1470201600018 a marked decrease in the counting rate was observed. 1470201600019 In order to show that these effects did not arise 1470201600020 solely from changes, the counter was removed from its 1470201600021 lead housing and placed in a copper cylinder of 2.8 1470201600022 cm wall thickness. Average value Pb and Cu gamma-rays 1470201600023 detection. 1470201600024 STATUS (TABLE) Table II, page 413. 1470201600025 ENDBIB 23 0 1470201600026 NOCOMMON 0 0 1470201600027 DATA 2 1 1470201600028 DATA DATA-ERR 1470201600029 B B 1470201600030 1.34 0.15 1470201600031 ENDDATA 3 0 1470201600032 ENDSUBENT 31 0 1470201699999 SUBENT 14702017 20210421 14841470201700001 BIB 4 22 1470201700002 REACTION (80-HG-0(N,INL)80-HG-0,,SIG,,SPA) 1470201700003 SAMPLE Calculated thickness as 3.9cm x 13.6 g/cm3=53.04 1470201700004 g/cm2. Transmission is normally smaller than 1 (or 1470201700005 only slightly bigger when an error of suitable size 1470201700006 is given, or when it is raw data), but here we have 1470201700007 values bigger than 1, authors explain it by saying 1470201700008 that fast neutrons slowed down in the absorbers may 1470201700009 result in more neutrons coming out. This means 1470201700010 something like a (n,2n) reaction in the absorber. 1470201700011 METHOD (TRN) Measurements were made alternately with and 1470201700012 without cylindrical absorbers. The counts recorded by 1470201700013 the Geiger-Muller counter (after subtracting the 1470201700014 natura1 background) were due chiefly to gamma-rays 1470201700015 excited in the lead by fast neutrons. When the 1470201700016 cylindrical "absorbers" were placed around the source, 1470201700017 a marked decrease in the counting rate was observed. 1470201700018 In order to show that these effects did not arise 1470201700019 solely from changes, the counter was removed from its 1470201700020 lead housing and placed in a copper cylinder of 2.8 1470201700021 cm wall thickness. Average value Pb and Cu gamma-rays 1470201700022 detection. 1470201700023 STATUS (TABLE) Table II, page 413. 1470201700024 ENDBIB 22 0 1470201700025 NOCOMMON 0 0 1470201700026 DATA 2 1 1470201700027 DATA DATA-ERR 1470201700028 B B 1470201700029 1.4 0.16 1470201700030 ENDDATA 3 0 1470201700031 ENDSUBENT 30 0 1470201799999 SUBENT 14702018 20210421 14841470201800001 BIB 4 22 1470201800002 REACTION (82-PB-0(N,INL)82-PB-0,,SIG,,SPA) 1470201800003 SAMPLE Calculated thickness as 4.2cm x 11.35 g/cm3=47.67 1470201800004 g/cm2. Transmission is normally smaller than 1 (or 1470201800005 only slightly bigger when an error of suitable size 1470201800006 is given, or when it is raw data), but here we have 1470201800007 values bigger than 1, authors explain it by saying 1470201800008 that fast neutrons slowed down in the absorbers may 1470201800009 result in more neutrons coming out. This means 1470201800010 something like a (n,2n) reaction in the absorber. 1470201800011 METHOD (TRN) Measurements were made alternately with and 1470201800012 without cylindrical absorbers. The counts recorded by 1470201800013 the Geiger-Muller counter (after subtracting the 1470201800014 natura1 background) were due chiefly to gamma-rays 1470201800015 excited in the lead by fast neutrons. When the 1470201800016 cylindrical "absorbers" were placed around the source, 1470201800017 a marked decrease in the counting rate was observed. 1470201800018 In order to show that these effects did not arise 1470201800019 solely from changes, the counter was removed from its 1470201800020 lead housing and placed in a copper cylinder of 2.8 1470201800021 cm wall thickness. Average value Pb and Cu gamma-rays 1470201800022 detection. 1470201800023 STATUS (TABLE) Table II, page 413. 1470201800024 ENDBIB 22 0 1470201800025 NOCOMMON 0 0 1470201800026 DATA 2 1 1470201800027 DATA DATA-ERR 1470201800028 B B 1470201800029 1.22 0.17 1470201800030 ENDDATA 3 0 1470201800031 ENDSUBENT 30 0 1470201899999 ENDENTRY 18 0 1470299999999