ENTRY 14695 20210309 14821469500000001 SUBENT 14695001 20210309 14821469500100001 BIB 9 22 1469500100002 TITLE The Scattering and Absorption Cross Section of 1469500100003 Neutrons in Cobalt 1469500100004 AUTHOR (N.E.Bradbury,F.Bloch,H.Tatel,P.A.Ross) 1469500100005 REFERENCE (J,PR,52,1023,1937) 1469500100006 #doi:10.1103/PhysRev.52.1023 1469500100007 INSTITUTE (1USASTF) 1469500100008 FACILITY (ACCEL,1USASTF) Ion gun. 1469500100009 INC-SOURCE (D-D) A low voltage neutron source which employs the 1469500100010 deuteron-deuteron reaction with a continuously 1469500100011 renewable target of ND4C1. Such a target is formed by 1469500100012 subliming ND4C1 on a metal target cooled with solid 1469500100013 CO2. 1469500100014 DETECTOR (BF3,GEMUC) A conventional scale of sixteen Wynn- 1469500100015 Williams counters is used with either a BF3 ionization 1469500100016 chamber and linear amplifier, or with a thin window 1469500100017 Geiger counter. The constancy of the source during a 1469500100018 measurement is determined by means of a LiF lined 1469500100019 Lauritsen electroscope which is lead shielded against 1469500100020 x-rays and placed near the small side hole cut in the 1469500100021 howitzer. 1469500100022 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. 1469500100023 HISTORY (20210309C) BP 1469500100024 ENDBIB 22 0 1469500100025 COMMON 1 3 1469500100026 EN-DUMMY 1469500100027 EV 1469500100028 1.0 1469500100029 ENDCOMMON 3 0 1469500100030 ENDSUBENT 29 0 1469500199999 SUBENT 14695002 20210309 14821469500200001 BIB 6 15 1469500200002 REACTION (26-FE-0(N,TOT),,SIG) 1469500200003 REL-REF (A,,A.C.G.Mitchell+,J,PR,50,133,1936) 1469500200004 SAMPLE Blocks about 5 mm thick and 35 mm square of iron were 1469500200005 cut. 1469500200006 METHOD (TRN) Targets were then surrounded with a tightly 1469500200007 fitting block of the borax-paraffin mixture and the 1469500200008 transmission measured as a function of thickness 1469500200009 using the BF3 ionization chamber. It may be noted 1469500200010 that placing a 1 mm sheet of cadmium in front of the 1469500200011 ionization chamber reduced the counts to 0.1 of the 1469500200012 unshielded value. 1469500200013 ANALYSIS From the transmission slope curves the sum of the 1469500200014 scattering and absorption cross sections for iron was 1469500200015 found. 1469500200016 STATUS (TABLE) page 1025. 1469500200017 ENDBIB 15 0 1469500200018 NOCOMMON 0 0 1469500200019 DATA 2 1 1469500200020 DATA DATA-ERR 1469500200021 B B 1469500200022 10.2 0.8 1469500200023 ENDDATA 3 0 1469500200024 ENDSUBENT 23 0 1469500299999 SUBENT 14695003 20210309 14821469500300001 BIB 5 15 1469500300002 REACTION (27-CO-59(N,TOT),,SIG) 1469500300003 SAMPLE Cobalt metal was melted and cast in a hydrogen 1469500300004 atmosphere in the form of blocks about 5 mm thick and 1469500300005 35 mm square. 1469500300006 METHOD (TRN) Targets were then surrounded with a tightly 1469500300007 fitting block of the borax-paraffin mixture and the 1469500300008 transmission measured as a function of thickness 1469500300009 using the BF3 ionization chamber. It may be noted 1469500300010 that placing a 1 mm sheet of cadmium in front of the 1469500300011 ionization chamber reduced the counts to 0.1 of the 1469500300012 unshielded value. 1469500300013 ANALYSIS From the transmission slope curves the sum of the 1469500300014 scattering and absorption cross sections for cobalt was1469500300015 found. 1469500300016 STATUS (TABLE) page 1025. 1469500300017 ENDBIB 15 0 1469500300018 NOCOMMON 0 0 1469500300019 DATA 2 1 1469500300020 DATA DATA-ERR 1469500300021 B B 1469500300022 26.1 2.6 1469500300023 ENDDATA 3 0 1469500300024 ENDSUBENT 23 0 1469500399999 ENDENTRY 3 0 1469599999999