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