ENTRY 13130 20181203 14451313000000001
SUBENT 13130001 20181203 14451313000100001
BIB 15 39 1313000100002
INSTITUTE (1USALAS) 1313000100003
REFERENCE (J,PR/C,36,1896,1987) 1313000100004
AUTHOR (W.L.Talbert Jr,J.W.Starner,R.J.Estep,S.J.Balestrini, 1313000100005
M.Attrep Jr,D.W.Efurd,F.R.Roensch) 1313000100006
TITLE Thermal-neutron fission cross section of 26.1-min 1313000100007
U-235M 1313000100008
FACILITY (REAC,1USALAS) Los Alamos Omega West Reactor 1313000100009
INC-SOURCE (THCOL) 1313000100010
INC-SPECT Peak energy of Maxwellian normal energy distribution 1313000100011
is 26 milli-eV, the energy of the most probable flux 1313000100012
in the wavelength representation of the Maxwellian 1313000100013
flux is 75.5 milli-eV. 1313000100014
The neutron spectrum is approximated by a Maxwellian 1313000100015
distribution of temperature 350 deg-K. 1313000100016
SAMPLE 6.E+10 to 3.E+11 atoms deposited on 9.5-mm diameter 1313000100017
platinum disk. Samples obtained by chemical separation1313000100018
of uranium grown in a 15-min period by alpha decay 1313000100019
of plutonium solution (200-400 mg Pu). 1313000100020
DETECTOR (FISCH) 1313000100021
DECAY-DATA (92-U-235-M,26.1MIN) 1313000100022
ANALYSIS Multiscale spectrum fitted to a + b x exp(-lambda T) 1313000100023
where a is normalized fission rate for 235-U-g in the 1313000100024
deposit at long times after separation, 1313000100025
including background and possible fissions 1313000100026
from plutonium 1313000100027
B is related to ratio of the isomeric to the 1313000100028
ground state cross sections 1313000100029
T is the time elapsed since the end of the 1313000100030
grow-in period during chemical separation 1313000100031
lambda is the isomeric state decay constant, 0.02656 1313000100032
minutes(-1). 1313000100033
CORRECTION Correction made for fissions due to any plutonium 1313000100034
found in the deposit by later alpha counting the disk.1313000100035
ERR-ANALYS Uncertainty is one standard deviation of the eight 1313000100036
individual samples results 1313000100037
STATUS (APRVD) W.L.Talbert, 88/10/28 1313000100038
HISTORY (19880413C) 1313000100039
(20181130U) OS. Minor correction in AUTHOR, converted 1313000100040
to lower and upper case. 1313000100041
ENDBIB 39 0 1313000100042
NOCOMMON 0 0 1313000100043
ENDSUBENT 42 0 1313000199999
SUBENT 13130002 19881221 00001313000200001
BIB 1 1 1313000200002
REACTION ((92-U-235-M(N,F),,SIG,,MXW)/(92-U-235(N,F),,SIG,,MXW))1313000200003
ENDBIB 1 0 1313000200004
NOCOMMON 0 0 1313000200005
DATA 3 1 1313000200006
EN-MEAN DATA DATA-ERR 1313000200007
MILLI-EV NO-DIM NO-DIM 1313000200008
26. 1.42 0.04 1313000200009
ENDDATA 3 0 1313000200010
ENDSUBENT 9 0 1313000299999
ENDENTRY 2 0 1313099999999