ENTRY 20790 20181212 22732079000000001 SUBENT 20790001 20181212 22732079000100001 BIB 18 62 2079000100002 INSTITUTE (2UK NPL) 2079000100003 REFERENCE (J,JNE,24,419,1970) Remeasurement with more accurate 2079000100004 data 2079000100005 (C,71CANT,,139,1971) conf report, same data 2079000100006 AUTHOR (T.B.Ryves,D.R.Perkins) 2079000100007 TITLE Thermal neutron capture cross-section measurements 2079000100008 for 23Na, 27Al, 37Cl and 51V 2079000100009 FACILITY (VDG,2UK NPL) 2079000100010 INC-SOURCE (D-BE) flux level 1.26 x 10**7 n/cm2/s. This value 2079000100011 is measured to 0.6% relative to the gold capture 2079000100012 cross section. 2079000100013 INC-SPECT NPL standard Maxwellian thermal spectrum. 2079000100014 SAMPLE The samples were in the form of thin discs of 22 mm 2079000100015 diam., except for the vanadium foils, which were of 2079000100016 11 mm diam. 2079000100017 METHOD (ACTIV) Activity measured by 4Pi beta-gamma 2079000100018 coincidence counting. 2079000100019 DETECTOR (PROPC) 4Pi-beta argon-methane gas flow 2079000100020 proportional counter. 2079000100021 (NAICR) 3 x 3 inch NaI(Tl) crystal. 2079000100022 (COIN,PROPC,NAICR) Absolute activities were measured 2079000100023 by beta-gamma coincidence counting. 2079000100024 ANALYSIS Saturated absolute activities per atom after 2079000100025 irradiation bare, and after irradiation encased 2079000100026 in 1mm cadmium, were combined to determine the 2079000100027 2200 m/s cross section and reduced resonance 2079000100028 integral using equations (see REL-REF). 2079000100029 CORRECTION .Beta efficiencies of the 4Pi-beta counter were 2079000100030 determined for each decay scheme. Corrections were 2079000100031 made for low specific activity,and electron 2079000100032 capture and conversion. 2079000100033 REL-REF (I,,T.B.Ryves+,J,JNE,22,759,1968) details of neutron 2079000100034 source. 2079000100035 (O,20789001,T.B.Ryves,J,JNE,24,35,1970) Cr.sect. for 2079000100036 26Mg,30Si,41K,50Ti,58Fe,64Ni,63Cu,79Br,81Br,115In, 2079000100037 121Sb,123Sb and 127I from the same set of exp. 2079000100038 (O,20791001,T.B.Ryves,J,JNE,25,129,1971) Cr.sect. for 2079000100039 69Ga, 71Ga, 75As, 89Y, 93Nb, 107Ag, 109Ag, 139La, 2079000100040 151Eu, 196Pt and 198Pt from the same set of exp. 2079000100041 MISC-COL (MISC) Measurement uncertainty (3sigma) presented by 2079000100042 the author used to define ERR-S. 2079000100043 ERR-ANALYS (ERR-S) Standard error on mean (1-sigma) which was 2079000100044 derived from MISC by compiler. 2079000100045 (ERR-SYS) Systematic error mainly from: 2079000100046 (ERR-1) uncertainty in neutron flux (An unassigned 2079000100047 error of +-2.% was included in the measurement of 2079000100048 flux to cover other possible undetected errors. 2079000100049 (ERR-2) uncertainty in sample weighing 2079000100050 (ERR-5) uncertainty in half-life 2079000100051 and also from ERR-2 or/and ERR-3 given in Subents below2079000100052 COMMENT Overall error given in the tables includes the overall 2079000100053 systematic error, which is then added linearly to 2079000100054 the random error calculated at the 99% confidence 2079000100055 level from the standard error of the mean to give the 2079000100056 final error for each isotope 2079000100057 (systematic + 3 standard error). 2079000100058 STATUS (TABLE) Tables 3,4 of Jour.Nucl.Energy,24(1970)419 2079000100059 HISTORY (19781010C) PDJ. Recompiled from NEUDADA 2079000100060 (20181212A) SD:Updated to new date formats,lower case. 2079000100061 STATUS moved to Subent 001. Ref. JNE,22,759,1968 moved 2079000100062 to REL-REF. ERR-ANALYS updated. Information from the 2079000100063 article was checked and corrected. FACILITY added. 2079000100064 ENDBIB 62 0 2079000100065 COMMON 1 3 2079000100066 ERR-1 2079000100067 PER-CENT 2079000100068 0.41 2079000100069 ENDCOMMON 3 0 2079000100070 ENDSUBENT 69 0 2079000199999 SUBENT 20790002 20181212 22732079000200001 BIB 6 11 2079000200002 REACTION (11-NA-23(N,G)11-NA-24,,SIG) 2200 m/sec value 2079000200003 SAMPLE 1.43 - 2.49 mg/cm2 NaCl on 7. mg/cm2 aluminium backing.2079000200004 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 2079000200005 DECAY-DATA (11-NA-24,15.HR,B-) 2079000200006 ERR-ANALYS Random error 2.2 mb from 12 measurements 2079000200007 (3 standard error).2079000200008 (ERR-3) uncertainty in impurities 2079000200009 (ERR-4) uncertainty in timing 2079000200010 HISTORY (20181212A) SD: HALF-LIFE -> DECAY-DATA. ERR-ANALYS 2079000200011 updated. PART-DET deleted. EN -> EN-DUMMY. DATA-ERR 2079000200012 deleted. Partial errors added. 2079000200013 ENDBIB 11 0 2079000200014 COMMON 5 3 2079000200015 ERR-2 ERR-3 ERR-4 ERR-5 MISC 2079000200016 PER-CENT PER-CENT PER-CENT PER-CENT MB 2079000200017 0.1 0.1 0.05 0.05 2.2 2079000200018 ENDCOMMON 3 0 2079000200019 DATA 6 1 2079000200020 EN-DUMMY DATA MONIT MONIT-ERR ERR-SYS ERR-S 2079000200021 EV MB B B PER-CENT PER-CENT 2079000200022 0.0253 526.9 98.8 0.3 2.3 0.73 2079000200023 ENDDATA 3 0 2079000200024 ENDSUBENT 23 0 2079000299999 SUBENT 20790003 20181212 22732079000300001 BIB 6 14 2079000300002 REACTION (13-AL-27(N,G)13-AL-28,,SIG) 2200 m/sec value 2079000300003 SAMPLE 7.3 mg foil of aluminium. 2079000300004 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 2079000300005 DECAY-DATA (13-AL-28,2.247MIN,B-) A new measurement gives 2079000300006 2.247+-0.018 minutes. 2079000300007 About 2% less than the current value in the table 2079000300008 of isotopes. A corresponding 0.2% systematic error 2079000300009 has been allowed. 2079000300010 ERR-ANALYS Random error 1.1 mb from 8 measurements 2079000300011 (3 standard error). 2079000300012 (ERR-4) uncertainty in timing 2079000300013 HISTORY (20181212A) SD: HALF-LIFE -> DECAY-DATA. ERR-ANALYS 2079000300014 updated. PART-DET deleted. EN -> EN-DUMMY. DATA-ERR 2079000300015 deleted. Partial errors added. 2079000300016 ENDBIB 14 0 2079000300017 COMMON 4 3 2079000300018 ERR-2 ERR-4 ERR-5 MISC 2079000300019 PER-CENT PER-CENT PER-CENT MB 2079000300020 0.1 0.1 0.2 1.1 2079000300021 ENDCOMMON 3 0 2079000300022 DATA 6 1 2079000300023 EN-DUMMY DATA MONIT MONIT-ERR ERR-SYS ERR-S 2079000300024 EV MB B B MB MB 2079000300025 0.0253 230.5 98.8 0.3 3.4 0.367 2079000300026 ENDDATA 3 0 2079000300027 ENDSUBENT 26 0 2079000399999 SUBENT 20790004 20181212 22732079000400001 BIB 6 10 2079000400002 REACTION (17-CL-37(N,G)17-CL-38,,SIG) 2200 m/sec value 2079000400003 SAMPLE 1.43 - 2.49 mg/cm2 NaCl on 7. mg/cm2 aluminium backing.2079000400004 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 2079000400005 DECAY-DATA (17-CL-38-G,37.3MIN,B-) 2079000400006 ERR-ANALYS Random error 3 mb from 9 measurements 2079000400007 (3 standard error). 2079000400008 (ERR-3) uncertainty in impurities 2079000400009 HISTORY (20181212A) SD: HALF-LIFE -> DECAY-DATA. ERR-ANALYS 2079000400010 updated. PART-DET deleted. EN -> EN-DUMMY. DATA-ERR 2079000400011 deleted. Partial errors added. 2079000400012 ENDBIB 10 0 2079000400013 COMMON 4 3 2079000400014 ERR-2 ERR-3 ERR-5 MISC 2079000400015 PER-CENT PER-CENT PER-CENT MB 2079000400016 0.1 0.1 0.5 3. 2079000400017 ENDCOMMON 3 0 2079000400018 DATA 6 1 2079000400019 EN-DUMMY DATA MONIT MONIT-ERR ERR-SYS ERR-S 2079000400020 EV MB B B MB MB 2079000400021 0.0253 433. 98.8 0.3 3. 1. 2079000400022 ENDDATA 3 0 2079000400023 ENDSUBENT 22 0 2079000499999 SUBENT 20790005 20181212 22732079000500001 BIB 6 11 2079000500002 REACTION (23-V-51(N,G)23-V-52,,SIG) 2200 m/sec value 2079000500003 SAMPLE Vanadium foils 3.67 - 4.97 mg/cm2 2079000500004 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 2079000500005 DECAY-DATA (23-V-52,3.77MIN,B-) 2079000500006 ERR-ANALYS Random error 0.02 mb from 6 measurements 2079000500007 (3 standard error). 2079000500008 (ERR-3) uncertainty in impurities 2079000500009 (ERR-4) uncertainty in timing 2079000500010 HISTORY (20181212A) SD: HALF-LIFE -> DECAY-DATA. ERR-ANALYS 2079000500011 updated. PART-DET deleted. EN -> EN-DUMMY. DATA-ERR 2079000500012 deleted. Partial errors added. 2079000500013 ENDBIB 11 0 2079000500014 COMMON 5 3 2079000500015 ERR-2 ERR-3 ERR-4 ERR-5 MISC 2079000500016 PER-CENT PER-CENT PER-CENT PER-CENT MB 2079000500017 0.05 0.1 0.1 0.1 0.02 2079000500018 ENDCOMMON 3 0 2079000500019 DATA 6 1 2079000500020 EN-DUMMY DATA MONIT MONIT-ERR ERR-SYS ERR-S 2079000500021 EV MB B B MB MB 2079000500022 0.0253 4880. 98.8 0.3 0.02 0.0067 2079000500023 ENDDATA 3 0 2079000500024 ENDSUBENT 23 0 2079000599999 ENDENTRY 5 0 2079099999999