ENTRY 21451 20180115 22672145100000001 SUBENT 21451001 20180115 22672145100100001 BIB 11 29 2145100100002 INSTITUTE (2UK MAN) 2145100100003 REFERENCE (J,PPS,85,79,1965) 2145100100004 AUTHOR (M.J.Harris,R.E.Kay) 2145100100005 TITLE Harmonic free determination of the thermal neutron 2145100100006 absorption cross section of hydrogen by a pulsed 2145100100007 source technique 2145100100008 FACILITY (VDG,2UK MAN) SAMES,type J, 150 KV deuteron accelerator2145100100009 INC-SOURCE (D-T) Deuteron-tritium reaction. 2145100100010 SAMPLE .Cylindrical water tank, radius 10.03+-0.3 cm, height 2145100100011 20 cm, covered with 0.04 in. Cd to prevent re-entry 2145100100012 of room-reflected thermal neutrons. Water with 2145100100013 conductivity of 7 micro-ohm/cm, total dissolved 2145100100014 solids less than 1 ppm. 2145100100015 METHOD .Measurement of the decay of the fundamental mode 2145100100016 (Fourier analysis) of the thermal neutron density 2145100100017 distribution in a cylinder of water after therma- 2145100100018 lization of an injected burst of fast neutrons. 2145100100019 Measurement of this decay for a range of water 2145100100020 depths enables determination, by extrapolation, of 2145100100021 the decay constant V*sigma(absorption) of an 2145100100022 infinitely large system. 2145100100023 DETECTOR (IOCH) 0.25 in. fission counter in a 1cm diam Al 2145100100024 tube + a large boron loaded n detector as flux 2145100100025 monitor. 2145100100026 STATUS (TABLE) Value from the text on p.84 of the PPS,85,79 2145100100027 HISTORY (19800229T) G.C. 2145100100028 (19800318E) 2145100100029 (20180115U) SD:Updated to new date formats,lower case. 2145100100030 Ref. update. BIB update. 2145100100031 ENDBIB 29 0 2145100100032 NOCOMMON 0 0 2145100100033 ENDSUBENT 32 0 2145100199999 SUBENT 21451002 20180115 22672145100200001 BIB 3 3 2145100200002 REACTION (1-H-1(N,G)1-H-2,,SIG,,MXW) 2145100200003 INC-SPECT Neutrons slowed down in the water tank. 2145100200004 ERR-ANALYS (DATA-ERR) No information about source of uncertainties2145100200005 ENDBIB 3 0 2145100200006 NOCOMMON 0 0 2145100200007 DATA 3 1 2145100200008 EN-DUMMY DATA DATA-ERR 2145100200009 EV MB MB 2145100200010 0.0253 326. 3. 2145100200011 ENDDATA 3 0 2145100200012 ENDSUBENT 11 0 2145100299999 ENDENTRY 2 0 2145199999999