ENTRY M0432 20161223 M086M043200000001
SUBENT M0432001 20161223 M086M043200100001
BIB 15 49 M043200100002
TITLE Photofission cross sections of Th-232 and U-236 M043200100003
from threshold to 8 MeV. M043200100004
AUTHOR (M.V.Yester,R.A.Anderl,R.C.Morrison) M043200100005
REFERENCE (J,NP/A,206,593,1973) M043200100006
INSTITUTE (1USAIOW) M043200100007
FACILITY (REAC,1USAIOW) M043200100008
INC-SOURCE (MPH=(28-NI-0(N,G))) M043200100009
A variable-energy beam of monoenergetic photons was M043200100010
obtained by Compton scattering the primary beam of M043200100011
radiative capture photons from an aluminium plate M043200100012
with a continuously variable radius of curvature. M043200100013
SAMPLE The target of Th-232 consisted of 156.4 mg of M043200100014
material (4.4 mg/cm**2) and was assayed at 100% M043200100015
Th-232. The U-236 target consisted of 317 mg of M043200100016
material (8.9 mg/cm**2) assayed at 89.38% U-236, M043200100017
9.20% U-235, 1.306% U-238, and 0.116% U-234. M043200100018
DETECTOR (SOLST) Heavy-ion silicon surface barrier detectors. M043200100019
Each of four detectors used was positioned on the M043200100020
rod located at 45 degrees with respect to the M043200100021
gamma-ray beam. M043200100022
PART-DET (FF) M043200100023
METHOD (EXTB) The yield points were formed from the sum of M043200100024
events in the four detectors. M043200100025
Compton scattering facility used provides a photon M043200100026
beam with a continuous energy distribution, rather M043200100027
than one discrete energy. hence, the photofission M043200100028
cross section could not be obtained directly, but M043200100029
were extracted from a measurement of fission M043200100030
yield as a function of end-point energy. M043200100031
ANALYSIS (UNFLD,LEAST) The unfolding procedure was the M043200100032
modification of least structure method of Cook: the M043200100033
cook's routine was developed for use not M043200100034
bremsstrahlung spectrum, but the specific spectrum M043200100035
of Compton scattered monoenergetic photons. M043200100036
REL-REF (N,,B.C.Cook,J,NIM,24,256,1963) M043200100037
Unfolding 'least-structure' method. M043200100038
ERR-ANALYS (ERR-S) The errors are statistical. M043200100039
(ERR-SYS) The systematic errors were estimated as to M043200100040
be about 30%. M043200100041
COMMENT Measurements of the photofission cross sections of M043200100042
Th-232 and U-236 for an energy range of 5.0 to 8.0 M043200100043
MeV are reported. The compton scattering facility at M043200100044
ames laboratory research reactor was used for these M043200100045
measurements. Resonance structure at g-ray energies M043200100046
of 6.3 and 7.6 MeV is observed in Th-232 and at 5.3, M043200100047
6.0, 6.5, and 7.5 MeV in U-236. M043200100048
HISTORY (19910218C) M043200100049
(20161223A) Corrected by V.Varlamov: dates, ANALYSIS, M043200100050
ERR-ANALYS, STATUS, REL-REF, COMMON, lowercase. M043200100051
ENDBIB 49 0 M043200100052
COMMON 1 3 M043200100053
ERR-SYS M043200100054
PER-CENT M043200100055
30. M043200100056
ENDCOMMON 3 0 M043200100057
ENDSUBENT 56 0 M043200199999
SUBENT M0432002 20161223 M086M043200200001
BIB 3 4 M043200200002
REACTION (92-U-236(G,F),,SIG) M043200200003
STATUS (TABLE) Data from Table 1. M043200200004
HISTORY (20161223A) Corrected by V.Varlamov: STATUS, M043200200005
ERR-S. M043200200006
ENDBIB 4 0 M043200200007
NOCOMMON 0 0 M043200200008
DATA 3 31 M043200200009
EN DATA ERR-S M043200200010
MEV MB MB M043200200011
5. -2.6 1.3 M043200200012
5.1 -2. 1.1 M043200200013
5.2 -1.1 .8 M043200200014
5.3 -0.1 .7 M043200200015
5.4 .2 .7 M043200200016
5.5 .7 .8 M043200200017
5.6 1.3 .9 M043200200018
5.7 2.1 1.0 M043200200019
5.8 3.2 1.0 M043200200020
5.9 4.2 1.0 M043200200021
6. 4.7 1.0 M043200200022
6.1 4.9 1.0 M043200200023
6.2 4.9 1.0 M043200200024
6.3 5. 1. M043200200025
6.4 5.3 1.0 M043200200026
6.5 5.7 1.1 M043200200027
6.6 5.7 1.1 M043200200028
6.7 5.5 1.1 M043200200029
6.8 5.3 1.1 M043200200030
6.9 5.0 1.1 M043200200031
7. 5.4 1.1 M043200200032
7.1 6.4 1.1 M043200200033
7.2 8.0 1.1 M043200200034
7.3 10.1 1.1 M043200200035
7.4 11.9 1.1 M043200200036
7.5 12.6 1.1 M043200200037
7.6 12.6 1.1 M043200200038
7.7 12.1 1.1 M043200200039
7.8 11.5 1.1 M043200200040
7.9 10.7 1.1 M043200200041
8. 9.8 1.3 M043200200042
ENDDATA 33 0 M043200200043
ENDSUBENT 42 0 M043200299999
SUBENT M0432003 20161223 M086M043200300001
BIB 3 4 M043200300002
REACTION (90-TH-232(G,F),,SIG) M043200300003
STATUS (TABLE) Data from Table 1. M043200300004
HISTORY (20161223A) Corrected by V.Varlamov: STATUS, M043200300005
ERR-S. M043200300006
ENDBIB 4 0 M043200300007
NOCOMMON 0 0 M043200300008
DATA 3 31 M043200300009
EN DATA ERR-S M043200300010
MEV MB MB M043200300011
5. -0.6 .6 M043200300012
5.1 -0.6 .5 M043200300013
5.2 -0.7 .3 M043200300014
5.3 -0.8 .3 M043200300015
5.4 -0.9 .4 M043200300016
5.5 -0.6 .4 M043200300017
5.6 .1 .5 M043200300018
5.7 .9 .5 M043200300019
5.8 1.7 .5 M043200300020
5.9 2.9 .5 M043200300021
6. 4.5 .5 M043200300022
6.1 6.2 .5 M043200300023
6.2 7.6 .5 M043200300024
6.3 8.3 .5 M043200300025
6.4 8.2 .5 M043200300026
6.5 7.5 .5 M043200300027
6.6 6.4 .5 M043200300028
6.7 5.2 .5 M043200300029
6.8 4.2 .5 M043200300030
6.9 3.6 .5 M043200300031
7. 3.4 .5 M043200300032
7.1 3.5 .5 M043200300033
7.2 3.9 .5 M043200300034
7.3 4.3 .5 M043200300035
7.4 4.7 .5 M043200300036
7.5 5.1 .5 M043200300037
7.6 5.1 .5 M043200300038
7.7 4.7 .5 M043200300039
7.8 3.9 .5 M043200300040
7.9 3.1 .5 M043200300041
8. 2.4 .6 M043200300042
ENDDATA 33 0 M043200300043
ENDSUBENT 42 0 M043200399999
ENDENTRY 3 0 M043299999999