ENTRY C2718 20220126 C212C271800000001 SUBENT C2718001 20220126 C212C271800100001 BIB 13 49 C271800100002 TITLE Cross section for the reaction 20(230,240)10 C271800100003 AUTHOR (C.P.Baker,M.G.Holloway,L.D.P.King,R.E.Schreiber) C271800100004 REFERENCE (R,LAMS-2,1943) Original report and erratum. C271800100005 INSTITUTE (1USAPUR) C271800100006 FACILITY (CYCLO,1USAPUR) C271800100007 INC-SPECT He3 beam. C271800100008 DETECTOR (IOCH) C271800100009 SAMPLE Deuterium gas. Target was about 0.55 MeV thick. C271800100010 METHOD The above cross section values were obtained from C271800100011 measurements in a cone of approximately 45 degrees C271800100012 about the direction of the beam. Additional C271800100013 measurements at right angles to the beam indicate C271800100014 that anisotropy exists in the center of mass system. C271800100015 ERR-ANALYS (DATA-ERR) Probable error. Each quantity involved in C271800100016 the calculations was critically examined and an C271800100017 estimate of the error in that quantity made. The C271800100018 uncertainty of a given quantity is the maximum amount C271800100019 or fraction of that quantity by which it is believed C271800100020 the measured value could have differed from the true C271800100021 value. If the reasonable view were taken that the C271800100022 uncertainties connected with sigma independent of C271800100023 each other, then their sum should be the square root C271800100024 of the sum of their squares. This gives a total C271800100025 root-mean-square uncertainty of 11.7% in the value of C271800100026 any one measurement of the absolute cross section. C271800100027 CORRECTION Corrections to the cross section for the effect of C271800100028 thick target and inhomogeneity of the beam. C271800100029 CRITIQUE Erratum: Experiments on the reaction 20(30,240)n [1-H- C271800100030 2(HE3,P)2-HE-4] have shown a mistake in the design C271800100031 of the ionization chamber used in the 230 [HE3] C271800100032 experiments. Corrections can be made to the results C271800100033 already obtained by calculating the fraction of the C271800100034 240's [2-HE-4] emitted which reached the detecting C271800100035 region with sufficient energy (about 330 keV by C271800100036 experiment) to be detected. In other words, the the C271800100037 solid angle in which particles were detected was not C271800100038 determined entirely by the collimating system but also C271800100039 by the variation of the range of the emitted particles C271800100040 with angle and bombarding energy. A crude estimate of C271800100041 the necessary correction factor to the data reported isC271800100042 1.02 for an average energy of 0.9 MeV, increasing to C271800100043 1.47 at 0.475 MeV. In making these estimates it was C271800100044 assumed that the energy loss in the collection region C271800100045 necessary for a particle to be detected was 0.8 MeV C271800100046 which has turned out to be too high, in view of some C271800100047 recent experiments. No recalculation is being made at C271800100048 this time, however, since the entire problem requires C271800100049 careful and detailed examination. C271800100050 HISTORY (20220126C) BP C271800100051 ENDBIB 49 0 C271800100052 COMMON 1 3 C271800100053 DATA-ERR C271800100054 PER-CENT C271800100055 11.7 C271800100056 ENDCOMMON 3 0 C271800100057 ENDSUBENT 56 0 C271800199999 SUBENT C2718002 20220126 C212C271800200001 BIB 2 3 C271800200002 REACTION (1-H-2(HE3,P)2-HE-4,,SIG) C271800200003 STATUS (TABLE) page 1. C271800200004 (SPSDD) Data are considered by authors as erroneous. C271800200005 ENDBIB 3 0 C271800200006 NOCOMMON 0 0 C271800200007 DATA 2 3 C271800200008 EN DATA C271800200009 MEV B C271800200010 0.3 0.0 C271800200011 0.65 0.8 C271800200012 1.0 0.5 C271800200013 ENDDATA 5 0 C271800200014 ENDSUBENT 13 0 C271800299999 ENDENTRY 2 0 C271899999999