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