ENTRY 22237 20080723 22022223700000001 SUBENT 22237001 20080723 22022223700100001 BIB 17 75 2223700100002 REFERENCE (J,NST,29,(8),794,199208) Main reference 2223700100003 TITLE -Neutron total cross sections of Pu-239 from transmis-2223700100004 sion measurements in the energy range of 1 to 500 keV.2223700100005 AUTHOR (H.Derrien) 2223700100006 INSTITUTE (2JPNJAE) H.Derrien 2223700100007 (1USAORL) Experimental site. 2223700100008 FACILITY (LINAC,1USAORL) The Oak Ridge electron linac (ORELA) 2223700100009 was used as a pulsed neutron source in a high 2223700100010 resolution transmission experiment by Harvey et al. 2223700100011 INC-SOURCE (SPALL) Neutrons in the energy range 0.5eV to 500 eV 2223700100012 were produced by spallation reaction using ORELA. 2223700100013 The accelerator pulse width was 16ns. 2223700100014 INC-SPECT The neutron spectrum was measured by TOF techniques. 2223700100015 METHOD (TOF) The flight path length 80.394m and the TOF 2223700100016 channel width 8 to 64ns. 2223700100017 (TRN) High resolution transmission measurements were 2223700100018 carried out by Harvey et Al. Analysis and corrections 2223700100019 for resonance self-shielding to yield average 2223700100020 corrected total cross sections for Pu239 were carried 2223700100021 out by Derrien using data obtained with various sample2223700100022 thicknesses. MONTE CARLO method was used to obtain 2223700100023 resonance parameters and thus simulate the true and 2223700100024 effective X-sections. Calculations, including Doppler 2223700100025 and resolution broadening were done using the code 2223700100026 SAMMY. 2223700100027 SAMPLE Three Pu239 samples of thickness 0.00646, 0.01825 and 2223700100028 0.07471 at/B were used. The sample effective 2223700100029 temperature was 106(5)K. 2223700100030 PART-DET (N) 2223700100031 (FF) 2223700100032 CORRECTION The data were corrected for the following effects. 2223700100033 1) background 2223700100034 2) self-shielding 2223700100035 ERR-ANALYS Statistical uncertainties and systematic errors. 2223700100036 The systematic errors on the transmission data 2223700100037 of Harvey were as follows 2223700100038 -1 % from normalization factor 2223700100039 -0.3 % on transmission between resonances 2223700100040 from background evaluation. 2223700100041 -Error due to self-shielding correction. 2223700100042 -Cross section error due to systematic error on 2223700100043 transmission measurements. 2223700100044 Statistical error was negligible. 2223700100045 -Absolute total error due to extrapolation (including2223700100046 systematic error on transmission measurement). 2223700100047 COMMENT Here Derrien corrects and extrapolates results of 2223700100048 transmission measurements carried out by Harvey et al.2223700100049 at Oak Ridge and presented by Harvey et al at 2223700100050 proceedings of the international Conf. for Nucl.Data 2223700100051 for Science and Technol., Mito 1988,page 115, JAERI. 2223700100052 ANALYSIS Resonance parameters from REL-REF were used to test 2223700100053 method by calculation of average effective cross 2223700100054 sections of three samples and total cross section in 2223700100055 8 energy intervals (Table2 of reference). 2223700100056 To derive extrapolated to zero-thickness cross 2223700100057 sections in energy range 1.-10.keV the average exp. 2223700100058 effective cross sections from three samples 2223700100059 transmissions were used.In energy range 10. - 500.keV 2223700100060 the average effective cross sections from thick sample2223700100061 transmission were used. 2223700100062 REL-REF (A,,H.Derrien+,J,NSE,106,434,1990) Data of resonance 2223700100063 parameters used in analysis. 2223700100064 STATUS (TABLE) Data from main ref., Tables 4,5,6. 2223700100065 (SPSDD,13632018) 2223700100066 (SPSDD,13632019) 2223700100067 HISTORY (19930818C) N.O. 2223700100068 (19931129E) 2223700100069 (20070807A) Date is corrected. SAN 002 corrected 2223700100070 (20070807U) Last corrections have been done. 2223700100071 (20071105A) Reference page number corrected after SD, 2223700100072 NO comments. Errors structure is given. SAN 002 2223700100073 corrected. 2223700100074 (20081030A) M.M. BIB information was added. 2223700100075 Subent 002 was deleted as duplication of 13632.018 2223700100076 and 13632.019 . 2223700100077 ENDBIB 75 0 2223700100078 NOCOMMON 0 0 2223700100079 ENDSUBENT 78 0 2223700199999 NOSUBENT 22237002 20081030 22022223700200001 ENDENTRY 2 0 2223799999999