ENTRY 23136 20191107 22832313600000001 SUBENT 23136001 20191107 22832313600100001 BIB 13 95 2313600100002 TITLE Neutron total and capture cross section of tungsten 2313600100003 isotopes 2313600100004 AUTHOR (C.Lampoudis, S.Kopecky, P.Schillebeeckx, P.Siegler, 2313600100005 K.Guber) 2313600100006 INSTITUTE (2ZZZGEL,1USAORL) 2313600100007 REFERENCE (J,KPS,59,1860,2011) ND2010 Conf.Proc. paper #1466 2313600100008 (C,2012KNOX,1,(387),2012) - preliminary set of 2313600100009 resonance parameters for 183W 2313600100010 REL-REF (I,,M.Flaska+,J,NIM/A,531,392,2004) 2313600100011 Details of GELINA. 2313600100012 (M,,D.B.Syme,J,NIM,198,357,1982) 2313600100013 Details of black resonances technique. 2313600100014 (I,,A.Borella+,J,NIM/A,577,626,2007) 2313600100015 Details of C6D6 detectors. 2313600100016 (M,,R.L.Macklin+,J,NIM,164,213,1979) 2313600100017 Details of capture yield calibration method. 2313600100018 FACILITY (LINAC,2ZZZGEL) GELINA at IRMM 2313600100019 INC-SOURCE (PHOTO) Electrons generate bremsstrahlung in rotating U2313600100020 target - neutrons were mainly produced by gamma,n and 2313600100021 gamma,f reactions. 2313600100022 SAMPLE Isotopically enriched metallic tungsten disks were part2313600100023 of the inventory of the ORNL isotope program. 2313600100024 For each isotope identical metallic disks were used and2313600100025 combined in the experiment to obtain different sample 2313600100026 thickness. 2313600100027 Isotope Label Weight Diameter Thickness 2313600100028 (g) (cm) (cm) 2313600100029 W-182 (93.8%) 1 47.6457 6.6 0.129 2313600100030 2 45.4032 6.6 0.129 2313600100031 3 47.1538 6.6 0.129 2313600100032 4 48.3836 6.6 0.129 2313600100033 W-183 (80.9%) 4 45.645 7.1 0.130 2313600100034 1+5 93.6633 7.1 0.285 2313600100035 W-184 (94.5%) 1 45.2854 7.061 0.115 2313600100036 4 45.6467 6.94 0.113 2313600100037 5 44.7428 6.786 0.114 2313600100038 6 44.9424 6.835 0.1145 2313600100039 7 43.4668 6.82 0.111 2313600100040 W-186 (96.9%) 2 45.4761 6.952 0.109 2313600100041 3 45.8759 6.917 0.110 2313600100042 4 44.7659 6.92 0.109 2313600100043 METHOD (TOF) Different flight path lengths and repetition 2313600100044 rates. 2313600100045 1(TRN) Transmission measurement. 2313600100046 -1ns pulse width with a repetition rate of 800Hz. 2313600100047 Neutron beam was collimated to a 4.5cm diameter at 2313600100048 the sample position. Background as a function of TOF 2313600100049 can be derived by the 'black resonance' technique. 2313600100050 - Shorter flight path of 25m with a 50Hz repetition 2313600100051 rate - at low neutron energy part. 2313600100052 2 Capture measurement. 2313600100053 -30m (flight path 15) and 60m (flight path 14), GELINA 2313600100054 operating at 800Hz. 2313600100055 Additional runs using a sample holder, an aluminum 2313600100056 canning dummy and Pb-208 sample in the beam in order to2313600100057 determine the background originating from the sample 2313600100058 holder and the scattered neutrons.Black resonance 2313600100059 filters were placed in the beam for supplementary 2313600100060 background control and B10 slab served as frame overlap2313600100061 filter. 2313600100062 -In a third set of experiments the samples were 2313600100063 positioned at flight path 5, at a distance of 10m from 2313600100064 the neutron production target. Repetition rate of 50Hz 2313600100065 focusing on the thermal energy range of the neutron 2313600100066 spectrum. 2313600100067 -To normalize the capture yield the data obtained for 2313600100068 flight paths 14 and 15, several runs having natural 2313600100069 iron samples in the neutron beam were performed. The 2313600100070 1.15keV resonance in Fe-56 was used for normalization. 2313600100071 Additional runs with natural iron and tungsten disks 2313600100072 were performed. Silver samples were used for the 50Hz 2313600100073 runs at flight path 5 and the normalization factor was 2313600100074 deduced after applying the saturated resonance 2313600100075 technique. 2313600100076 DETECTOR 1(GLASD) At 50m measuring station,neutrons were detected2313600100077 by 0.635-cm-thick Li-6-loaded glass scintillator,viewed2313600100078 by one photomultiplier placed outside of the neutron 2313600100079 beam, at a distance of 49.33m . 2313600100080 2(SCIN) In the first case two C6D6 detectors, 2313600100081 for the longer distance four C6D6 are used to detect 2313600100082 the capture gamma rays. 2313600100083 (IOCH) At 80cm prior the detectors' array a B-10 loaded2313600100084 ionization chamber served as a flux monitor. 2313600100085 ANALYSIS The software code AGS (Analysis of Geel Spectra, 2313600100086 C. Bastian et al.. AGS, Computer Code for Uncertainty 2313600100087 Propagation in time of flight Cross Section Data, 2313600100088 Physor 2006, Vancouver, Canada,2006) was used to reduce2313600100089 the data. 2313600100090 STATUS (UNOBT) Request of data sent 2011-07-22 to C.Lampoudis 2313600100091 Christos.Lampoudis@ec.europa.eu - reply 24 Aug 2011: 2313600100092 "The data will be available only after been fully 2313600100093 analyzed." 2313600100094 HISTORY (20110722C) M.M. 2313600100095 (20130110U) On. INC-SOURCE: BRST -> PHOTO 2313600100096 (20191107U) SD: Ref. added. 2313600100097 ENDBIB 95 0 2313600100098 NOCOMMON 0 0 2313600100099 ENDSUBENT 98 0 2313600199999 SUBENT 23136002 20110722 22282313600200001 BIB 2 2 2313600200002 REACTION (74-W-184(N,TOT),,TRN) Transmission. 2313600200003 STATUS (UNOBT) Data are on Figs.1,4 of J,KPS,58,(1466),2011. 2313600200004 ENDBIB 2 0 2313600200005 NOCOMMON 0 0 2313600200006 NODATA 0 0 2313600200007 ENDSUBENT 6 0 2313600299999 SUBENT 23136003 20130110 22342313600300001 BIB 3 3 2313600300002 REACTION (74-W-184(N,G)74-W-185,,RYL) Capture yields 2313600300003 STATUS (UNOBT) Fig.3 of Kor.Phys.Soc.59(2011)1860 2313600300004 HISTORY (20130110A) On. REACTION: ,TRN,,RYL -> ,RYL 2313600300005 ENDBIB 3 0 2313600300006 NOCOMMON 0 0 2313600300007 NODATA 0 0 2313600300008 ENDSUBENT 7 0 2313600399999 ENDENTRY 3 0 2313699999999