ENTRY 10569 20131104 13951056900000001
SUBENT 10569001 20131104 13951056900100001
BIB 11 18 1056900100002
TITLE Subthreshold Fission Induced by Neutrons on 238U 1056900100003
AUTHOR (R.C.Block,R.W.Hockenbury,R.E.Slovacek,E.B.Bean, 1056900100004
D.S.Cramer) 1056900100005
REFERENCE (J,PRL,31,247,1973) 1056900100006
#doi:10.1103/PhysRevLett.31.247 1056900100007
INSTITUTE (1USARPI,1USAKAP) 1056900100008
FACILITY (LINAC,1USARPI) 1056900100009
INC-SOURCE (PHOTO) Photoneutrons from tantalum target. 1056900100010
METHOD (TOF) Time-of-flight over 10.1 meter flight path. 1056900100011
SAMPLE (92-U-238,ENR=1.0) The concentration of 235U was 1056900100012
27(6) ppm, less than 0.3 ppm of 233,234,236U. 1056900100013
DETECTOR (FISCH) Fission ionization chambers 1056900100014
STATUS (APRVD) Approved by author 1976/4/21. 1056900100015
HISTORY (19760126C) 1056900100016
(19830913A) converted to reaction formalism 1056900100017
(20040602A) converted to new date formats, lower case. 1056900100018
(20131104A) BP: Added doi, updated subentries, removed 1056900100019
subentry 6 with UNOBT status. 1056900100020
ENDBIB 18 0 1056900100021
NOCOMMON 0 0 1056900100022
ENDSUBENT 21 0 1056900199999
SUBENT 10569002 20131104 13951056900200001
BIB 4 7 1056900200002
REACTION 1(92-U-238(N,0),,EN) 1056900200003
2(92-U-238(N,F),,ARE) 1056900200004
ANALYSIS (AREA,SLA) The thin-sample approximation is used 1056900200005
for the integration of a Breit-Wigner single-level 1056900200006
resonance. 1056900200007
ERR-ANALYS2(DATA-ERR) No information on source of uncertainties. 1056900200008
STATUS (TABLE) Table I, page 249. 1056900200009
ENDBIB 7 0 1056900200010
NOCOMMON 0 0 1056900200011
DATA 3 2 1056900200012
DATA 1DATA 2DATA-ERR 2 1056900200013
EV B*EV B*EV 1056900200014
720. 0.31 0.08 1056900200015
1210. 0.11 0.03 1056900200016
ENDDATA 4 0 1056900200017
ENDSUBENT 16 0 1056900299999
SUBENT 10569003 20131104 13951056900300001
BIB 5 11 1056900300002
REACTION 1(92-U-238(N,0),,EN) 1056900300003
2(92-U-238(N,0),,L) 1056900300004
3(92-U-238(N,F),,WID) 1056900300005
ANALYSIS (SLA) Single level Breit-Wigner analysis. L=0 for s- 1056900300006
wave resonance. 1056900300007
ERR-ANALYS3(DATA-ERR) Primarily from the uncertainty of 235U 1056900300008
content of the 238U chambers. 1056900300009
ASSUMED (ASSUM,92-U-238(N,G),,WID) 1056900300010
Values calculated using assumed radiation width 1056900300011
of well I of the double-humped fission barrier. 1056900300012
STATUS (TABLE) Table I, page 249. 1056900300013
ENDBIB 11 0 1056900300014
COMMON 1 3 1056900300015
ASSUM 1056900300016
MILLI-EV 1056900300017
23. 1056900300018
ENDCOMMON 3 0 1056900300019
DATA 4 2 1056900300020
DATA 1DATA 2DATA 3DATA-ERR 3 1056900300021
EV NO-DIM MILLI-EV MILLI-EV 1056900300022
720. 0. 1.2 0.3 1056900300023
1210. 0. 0.12 0.03 1056900300024
ENDDATA 4 0 1056900300025
ENDSUBENT 24 0 1056900399999
SUBENT 10569004 20131104 13951056900400001
BIB 5 11 1056900400002
REACTION 1(92-U-238(N,0),,EN) 1056900400003
2(92-U-238(N,0),,L) 1056900400004
3(92-U-238(N,F),,WID) 1056900400005
ANALYSIS (SLA) Single level Breit-Wigner analysis. L=0 for s- 1056900400006
wave resonance. 1056900400007
ERR-ANALYS3(DATA-ERR) Primarily from the uncertainty of 235U 1056900400008
content of the 238U chambers. 1056900400009
ASSUMED (ASSUM,92-U-238(N,G),,WID) 1056900400010
Values calculated using assumed radiation width 1056900400011
of well II of the double-humped fission barrier. 1056900400012
STATUS (TABLE) Table I, page 249. 1056900400013
ENDBIB 11 0 1056900400014
COMMON 1 3 1056900400015
ASSUM 1056900400016
MILLI-EV 1056900400017
4.9 1056900400018
ENDCOMMON 3 0 1056900400019
DATA 4 2 1056900400020
DATA 1DATA 2DATA 3DATA-ERR 3 1056900400021
EV NO-DIM MILLI-EV MILLI-EV 1056900400022
720. 0. 0.29 0.07 1056900400023
1210. 0. 0.051 0.013 1056900400024
ENDDATA 4 0 1056900400025
ENDSUBENT 24 0 1056900499999
SUBENT 10569005 20131104 13951056900500001
BIB 7 12 1056900500002
REACTION (92-U-238(N,F),,SIG,,AV) 1056900500003
ERR-ANALYS (DATA-ERR) No information on source of uncertainties. 1056900500004
METHOD The 238U fission cross section is deduced from the 1056900500005
normalization. An auxiliary measurement was also 1056900500006
carried out with 235U (93% enriched) fission chamber in1056900500007
the same geometry to normalize the 238U subthreshold 1056900500008
fission cross section to the known 235U fission cross 1056900500009
section. 1056900500010
MONITOR (92-U-235(N,F),,SIG) 1056900500011
MONIT-REF (,,R,BNL-325,(3),1965) 1056900500012
STATUS (TABLE) Table II, page 250. 1056900500013
REL-REF (A,10290001,M.G.Silbert+,J,PR/C,4,220,1971) 1056900500014
ENDBIB 12 0 1056900500015
NOCOMMON 0 0 1056900500016
DATA 4 2 1056900500017
EN-MIN EN-MAX DATA DATA-ERR 1056900500018
KEV KEV MICRO-B MICRO-B 1056900500019
10. 30. 87. 26. 1056900500020
30. 100. 40. 12. 1056900500021
ENDDATA 4 0 1056900500022
ENDSUBENT 21 0 1056900599999
NOSUBENT 10569006 20131104 13951056900600001
ENDENTRY 6 0 1056999999999