ENTRY 20006 20080310 21962000600000001 SUBENT 20006001 20080310 21962000600100001 BIB 11 53 2000600100002 INSTITUTE (2SWDUPP) Author's address Uppsala University. 2000600100003 (2SWDAE) Work performed at AB ATOMENERGY Stockholm. 2000600100004 REFERENCE (J,NUK,11,61,196805) 2000600100005 (R,AE-304,196711) 2000600100006 (W,LUNDGREN,1968) Data on Table. 2000600100007 AUTHOR (G.Lundgren) 2000600100008 TITLE -A study of the energy dependence of the 90-Th-232 2000600100009 capture cross section in the energy region 0.1 eV to 2000600100010 3.4 eV.- 2000600100011 REL-REF (N,,D.E.Cullen+,R,UCRL-50400,19760704) 2000600100012 Vol.7, Revision 1, part B. 2000600100013 "Major neutron-induced interactions (Z> 35): 2000600100014 graphical, experimental data." 2000600100015 ECSIL-2084 (68) - for this article (J,NUK,11,61,1968).2000600100016 Graphs are given. 2000600100017 FACILITY (REAC,2SWDAE) R1 reactor in Stockholm, maximum power 2000600100018 600 kW,epithermal flux density about 8.E+10 n/cm2/sec. 2000600100019 (CHOPF,2SWDAE) Fast chopper,burst width 33 micros FWHM,2000600100020 triangle shaped neutron pulse in time dependent form. 2000600100021 INC-SOURCE (REAC) Graphite scatterer in the central beam 2000600100022 channel of the R1 reactor. 2000600100023 Cross section of neutron beam in sample position was 2000600100024 1.0 * 5.0 cm**2. 2000600100025 SAMPLE -Thorium,oxide ThO2 powder sample, density =2.30gr/cm3.2000600100026 1.0 * 5.0 * 6.0 cm3 in 0.5 mm aluminum container, 2000600100027 Position with the 6.0 cm side parallel to the beam. 2000600100028 Desintegration products removed after each 2000600100029 measurement in order to reduce parasitic 2000600100030 gamma background. 2000600100031 -Copper, powder sample of the same density 2000600100032 and the same geometry. 2000600100033 Sample composition - 29-Cu 46.1 %, 2000600100034 82-Pb 47.4 %, 2000600100035 13-Al 6.5 %. 2000600100036 -Mixture of Li2-CO3 -1.43%, Pb - 2.76%, Pb-O2 - 87.32%,2000600100037 Al - 7.50%.Sample density 2.30 g/cm**3. Used to obtain2000600100038 correction for effects of neutron scattering in sample2000600100039 and surrounding materials. 2000600100040 METHOD (TOF) Flight path = 1.917 m. 2000600100041 (CHSEP) Chemical separation technique to remove a large2000600100042 fraction of the daughter products. 2000600100043 DETECTOR (NAICR) 3inch * 3inch size Na-I(Tl) crystal with 2000600100044 photomultiplier,output lead to the time analyzer via 2000600100045 a single channel analyzer. 2000600100046 HISTORY (19690423C) 2000600100047 (19700822A) Comment adapted. 2000600100048 (19700826T) From NEUDADA. 2000600100049 (19701118E) 2000600100050 (19860310A)N.CH 2000600100051 (19860416E) 2000600100052 (20080311A) M.M.Dates were corrected for 4-digits year.2000600100053 Free text was corrected to be "human-readable". 2000600100054 BIB information was added. SUBENT 005 was added. 2000600100055 ENDBIB 53 0 2000600100056 NOCOMMON 0 0 2000600100057 ENDSUBENT 56 0 2000600199999 SUBENT 20006002 20080310 21962000600200001 BIB 7 35 2000600200002 REACTION 1((90-TH-232(N,G)90-TH-233,,SIG)/(29-CU-0(N,G),,SIG)) 2000600200003 Experimental ratio, not corrected. 2000600200004 2(90-TH-232(N,G)90-TH-233,,SIG) 2000600200005 ANALYSIS 2 Cross sections derived from ratios. 2000600200006 MONITOR 2(29-CU-0(N,G),,SIG) 2000600200007 PART-DET (G) For thorium 1.8 - 2.2 MeV, 2000600200008 for copper 3. - 6. MeV 2000600200009 and 1.8 - 2.4 MeV in the cases 2000600200010 where both elements has been measured in a common 2000600200011 gamma energy range. 2000600200012 STATUS (TABLE) Private communication 18/11/1968.Data in Table.2000600200013 In Table of 1-st reference the experimental and 2000600200014 corrected ratios of cross-sections are presented. 2000600200015 Graph of cross-section is in REL-REF, page 10-85. 2000600200016 CORRECTION Three types of background, 2000600200017 -From gamma activity of thorium decay products, 2000600200018 minimized by chemical separation. 2000600200019 -From background in the reactor hall, 2000600200020 minimized by a heavy lead shield round sample and 2000600200021 detector, surrounded by 10 cm paraffin mixed with 2000600200022 H(3)-B-O(3), 2000600200023 both backgrounds are recorded in 140 channels of the 2000600200024 256 channel analyzer. 2000600200025 -Scattering of neutrons in the sample and giving 2000600200026 capture gammas from elsewhere. 2000600200027 Minimized by a B(4)-C shield round sample, 2000600200028 measured using a sample with the same scattering and 2000600200029 without gammas above 1.8 MeV . 2000600200030 -Not corrected for selfscreening, but this will cancel 2000600200031 in the ratio provided the macroscopic cross sections 2000600200032 are the same for the two samples. 2000600200033 Applied correction factors are given in Table of 2000600200034 reference for energies from 0.253 (1.00) to 3.40 eV 2000600200035 (0.920). 2000600200036 ERR-ANALYS Not given. 2000600200037 ENDBIB 35 0 2000600200038 NOCOMMON 0 0 2000600200039 DATA 3 47 2000600200040 EN DATA 1DATA 2 2000600200041 MEV NO-DIM B 2000600200042 9.8000E-08 2.302 3.5600E+00 2000600200043 1.0100E-07 2.314 3.5200E+00 2000600200044 1.0500E-07 2.331 3.5100E+00 2000600200045 1.0900E-07 2.385 3.5000E+00 2000600200046 1.1300E-07 2.309 3.3700E+00 2000600200047 1.1800E-07 2.256 3.2500E+00 2000600200048 1.2300E-07 2.237 3.1600E+00 2000600200049 1.2800E-07 2.297 3.1600E+00 2000600200050 1.3300E-07 2.231 3.0400E+00 2000600200051 1.3900E-07 2.337 3.1000E+00 2000600200052 1.4500E-07 2.244 2.8900E+00 2000600200053 1.5200E-07 2.411 2.9600E+00 2000600200054 1.5900E-07 2.412 2.9300E+00 2000600200055 1.6700E-07 2.324 2.7800E+00 2000600200056 1.7500E-07 2.272 2.6300E+00 2000600200057 1.8400E-07 2.287 2.5700E+00 2000600200058 1.9300E-07 2.229 2.4400E+00 2000600200059 2.0300E-07 2.305 2.4500E+00 2000600200060 2.1400E-07 2.232 2.3100E+00 2000600200061 2.2600E-07 2.134 2.2100E+00 2000600200062 2.3900E-07 2.302 2.1900E+00 2000600200063 2.5300E-07 2.226 2.1500E+00 2000600200064 2.6900E-07 2.193 2.0700E+00 2000600200065 2.8900E-07 2.264 1.9700E+00 2000600200066 3.0400E-07 2.161 1.7800E+00 2000600200067 3.2400E-07 2.137 1.7300E+00 2000600200068 3.4700E-07 1.856 1.5300E+00 2000600200069 3.7200E-07 2.112 1.7300E+00 2000600200070 3.9900E-07 2.088 1.6000E+00 2000600200071 4.3000E-07 1.909 1.3760E+00 2000600200072 4.6500E-07 2.150 1.4660E+00 2000600200073 5.0500E-07 2.326 1.5420E+00 2000600200074 5.4900E-07 2.040 1.3480E+00 2000600200075 5.9900E-07 2.226 1.3220E+00 2000600200076 6.5600E-07 1.884 1.1190E+00 2000600200077 7.3200E-07 1.936 1.1250E+00 2000600200078 7.9900E-07 1.723 9.6800E-01 2000600200079 8.8800E-07 1.915 1.0560E+00 2000600200080 9.9300E-07 1.714 8.9500E-01 2000600200081 1.1180E-06 1.644 7.8000E-01 2000600200082 1.2700E-06 1.789 7.7500E-01 2000600200083 1.4500E-06 1.482 6.0800E-01 2000600200084 1.6800E-06 1.110 4.2500E-01 2000600200085 1.9600E-06 1.407 4.3700E-01 2000600200086 2.3200E-06 1.295 3.6600E-01 2000600200087 2.7800E-06 1.081 2.9500E-01 2000600200088 3.4000E-06 1.051 2.6500E-01 2000600200089 ENDDATA 49 0 2000600200090 ENDSUBENT 89 0 2000600299999 SUBENT 20006003 20080310 21962000600300001 BIB 6 25 2000600300002 REACTION (90-TH-232(N,G)90-TH-233,,RI,,RV,DERIV) 2000600300003 Value of contributions above EN-MIN to resonance 2000600300004 integral from tail of negative resonance -5.1 eV and 2000600300005 1/v parts of positive resonances. 2000600300006 ANALYSIS Using the negative resonance energy found in this 2000600300007 reference in the formula SIGMA-(1/V) = 2000600300008 (INTEGRAL((E-MIN) TO (INFINITY))) (SQUARE ROOT(E0/E) *2000600300009 (6.95 * (E0-ER) ** 2)/((E-ER) ** 2) + 0.45) * DE/E, 2000600300010 with ER = negative resonance energy, 2000600300011 E0 = thermal energy, 2000600300012 6.95 = SIGMA absorption at E-thermal due to the 2000600300013 negative resonance, 2000600300014 0.45 = contributions to SIGMA(N,GAMMA) at 2000600300015 E-thermal of the positive resonances, 2000600300016 Data from J.R.Stehn et al.,BNL-325,suppl.2,(1965) and 2000600300017 M.Asghar et al.,Nucl.Phys.,76(1966)196. 2000600300018 REL-REF (R,,J.R.Stehn+,R,BNL-325,2,1965) 2000600300019 (R,,M.Asghar+,J,NP,76,196,1966) 2000600300020 ERR-ANALYS Not given. 2000600300021 STATUS Text of 1-st reference, p.67. 2000600300022 Abstract of 1-st reference, p.61. 2000600300023 (DEP,20006004) 2000600300024 HISTORY (20080310A) M.M. Monitor was deleted, because this data2000600300025 were derived from analysis of data from SUBENT 002. 2000600300026 "RV,DERIV" was added in REACTION . 2000600300027 ENDBIB 25 0 2000600300028 NOCOMMON 0 0 2000600300029 DATA 2 2 2000600300030 EN-MIN DATA 2000600300031 MEV B 2000600300032 5.0000E-07 1.6000E+00 2000600300033 6.0000E-07 1.3000E+00 2000600300034 ENDDATA 4 0 2000600300035 ENDSUBENT 34 0 2000600399999 SUBENT 20006004 20080310 21962000600400001 BIB 7 18 2000600400002 REACTION (90-TH-232(N,EL),,WID/RED) 2000600400003 ANALYSIS Derived from the deviation from 1/V law, gamma-gamma =2000600400004 24+-2 milli-eV assumed (being the mean value for the 2000600400005 positive resonances), measurement of N,GAMMA 2000600400006 cross section ratio in the same reference used. 2000600400007 Method of least squares was used. 2000600400008 CORRECTION For not-1/V part of the cross section in copper and 2000600400009 the not-1/V part of the cross section due to positive 2000600400010 resonances in thorium. 2000600400011 ERR-ANALYS (DATA-ERR) Statistical errors and time uncertainty. 2000600400012 ASSUMED (ASSUM,90-TH-232(N,G),,WID) 2000600400013 HISTORY (20080310A) M.M. Units of EN-ERR were corrected "MEV" 2000600400014 into "EV" in according value in 1-st reference. 2000600400015 "EN-ERR" was changed into "EN-RES-ERR". 2000600400016 ASSUM was added in COMMON block. 2000600400017 STATUS Text of reference, p.66 - EN-RES, p.67 - DATA. 2000600400018 Abstract of 1-st reference, p.61. 2000600400019 (DEP,20006002) 2000600400020 ENDBIB 18 0 2000600400021 COMMON 1 3 2000600400022 ASSUM 2000600400023 MILLI-EV 2000600400024 24. 2000600400025 ENDCOMMON 3 0 2000600400026 DATA 5 1 2000600400027 EN-RES EN-RES-ERR MOMENTUM L DATA DATA-ERR 2000600400028 EV EV NO-DIM MILLI-EV MILLI-EV 2000600400029 -5.1 0.5 0.0 1.8 0.4 2000600400030 ENDDATA 3 0 2000600400031 ENDSUBENT 30 0 2000600499999 SUBENT 20006005 20080310 21962000600500001 BIB 5 7 2000600500002 REACTION (90-TH-232(N,SCT)90-TH-232,,SIG,,,DERIV) 2000600500003 ASSUMED (ASSUM,90-TH-232(N,SCT)90-TH-232,POT,SIG) 2000600500004 REL-REF (R,,K.K.Seth+,J,PR,110,692,1958) Reference for ASSUM. 2000600500005 STATUS Abstract of 1-st reference, p.61. 2000600500006 Text of 1-st reference, p. 67. 2000600500007 (DEP,20006004) 2000600500008 HISTORY (20080310C) M.M. 2000600500009 ENDBIB 7 0 2000600500010 COMMON 2 3 2000600500011 ASSUM ASSUM-ERR 2000600500012 B B 2000600500013 12.1 0.2 2000600500014 ENDCOMMON 3 0 2000600500015 DATA 3 1 2000600500016 EN DATA DATA-ERR 2000600500017 EV B B 2000600500018 0.025 12.2 0.4 2000600500019 ENDDATA 3 0 2000600500020 ENDSUBENT 19 0 2000600599999 ENDENTRY 5 0 2000699999999