ENTRY M0426 20130621 M067M042600000001 SUBENT M0426001 20130621 M067M042600100001 BIB 16 35 M042600100002 TITLE Very low energy photofission of U-238. M042600100003 AUTHOR (C.D.Bowman,I.G.Schroder,C.E.Dick,H.E.Jackson) M042600100004 REFERENCE (J,PR/C,12,863,1975) M042600100005 #doi:10.1103/PhysRevC.12.863 M042600100006 INSTITUTE (1USANIS) M042600100007 FACILITY (LINAC,1USANIS) M042600100008 INC-SOURCE (BRST) M042600100009 METHOD (EXTB) M042600100010 DETECTOR (TRD) Mica-foil track detector. M042600100011 PART-DET (FF) M042600100012 SAMPLE The depleted u-238 foil of 3.2 mm thickness M042600100013 (4.3 mg/cm**2). M042600100014 ANALYSIS (UNFLD,DIFFR) The cross section was derived from the M042600100015 experimental yield curve as the approximated M042600100016 solution by the photon difference method. M042600100017 CORRECTION Correction for spontaneous fission rate of the sample M042600100018 was done simply by measuring the time during which M042600100019 the mica was in contact with the sample, and M042600100020 calculating the track-density correction from the M042600100021 known spontaneous fission half-life. M042600100022 ERR-ANALYS (DATA-ERR) The errors are the quadratic sums of the M042600100023 standard deviations resulting from track countings M042600100024 and an estimated (near 20%) uncertainty in the M042600100025 bremsstrahlung spectrum. M042600100026 COMMENT The photofission cross section of U-238 was measured M042600100027 in the 2.75 to 5.75 MeV range. Cross section as M042600100028 small as 2 * 10**(-11) barns were detected. A shelf M042600100029 was observed which had been predicted to occur in M042600100030 the cross section owing to the dominance of M042600100031 radiative decay of levels in the second well of the M042600100032 potential barrier of U-238. M042600100033 STATUS (TABLE) M042600100034 HISTORY (19910218C) M042600100035 (20130621A) Corrected by V.Varlamov: REACTION, M042600100036 STATUS, dates, lowercase. M042600100037 ENDBIB 35 0 M042600100038 NOCOMMON 0 0 M042600100039 ENDSUBENT 38 0 M042600199999 SUBENT M0426002 20130621 M067M042600200001 BIB 2 2 M042600200002 REACTION (92-U-238(G,F),,SIG,,BRS) M042600200003 HISTORY (20130621A) Corrected by V.Varlamov: BRA -> BRS. M042600200004 ENDBIB 2 0 M042600200005 NOCOMMON 0 0 M042600200006 DATA 3 7 M042600200007 EN DATA DATA-ERR M042600200008 MEV B B M042600200009 2.75 1.9E-11 1.0E-11 M042600200010 3.25 8.2E-10 2.9E-10 M042600200011 3.75 3.5E-09 .8E-09 M042600200012 4.25 3.9E-08 .9E-08 M042600200013 4.75 1.3E-06 .3E-06 M042600200014 5.25 4.4E-05 1.0E-05 M042600200015 5.75 1.3E-03 .3E-03 M042600200016 ENDDATA 9 0 M042600200017 ENDSUBENT 16 0 M042600299999 ENDENTRY 2 0 M042699999999