ENTRY 23136 20191107 228323136 0 1 SUBENT 23136001 20191107 228323136 1 1 BIB 13 95 23136 1 2 TITLE Neutron total and capture cross section of tungsten 23136 1 3 isotopes 23136 1 4 AUTHOR (C.Lampoudis, S.Kopecky, P.Schillebeeckx, P.Siegler, 23136 1 5 K.Guber) 23136 1 6 INSTITUTE (2ZZZGEL,1USAORL) 23136 1 7 REFERENCE (J,KPS,59,1860,2011) ND2010 Conf.Proc. paper #1466 23136 1 8 (C,2012KNOX,1,(387),2012) - preliminary set of 23136 1 9 resonance parameters for 183W 23136 1 10 REL-REF (I,,M.Flaska+,J,NIM/A,531,392,2004) 23136 1 11 Details of GELINA. 23136 1 12 (M,,D.B.Syme,J,NIM,198,357,1982) 23136 1 13 Details of black resonances technique. 23136 1 14 (I,,A.Borella+,J,NIM/A,577,626,2007) 23136 1 15 Details of C6D6 detectors. 23136 1 16 (M,,R.L.Macklin+,J,NIM,164,213,1979) 23136 1 17 Details of capture yield calibration method. 23136 1 18 FACILITY (LINAC,2ZZZGEL) GELINA at IRMM 23136 1 19 INC-SOURCE (PHOTO) Electrons generate bremsstrahlung in rotating U23136 1 20 target - neutrons were mainly produced by gamma,n and 23136 1 21 gamma,f reactions. 23136 1 22 SAMPLE Isotopically enriched metallic tungsten disks were part23136 1 23 of the inventory of the ORNL isotope program. 23136 1 24 For each isotope identical metallic disks were used and23136 1 25 combined in the experiment to obtain different sample 23136 1 26 thickness. 23136 1 27 Isotope Label Weight Diameter Thickness 23136 1 28 (g) (cm) (cm) 23136 1 29 W-182 (93.8%) 1 47.6457 6.6 0.129 23136 1 30 2 45.4032 6.6 0.129 23136 1 31 3 47.1538 6.6 0.129 23136 1 32 4 48.3836 6.6 0.129 23136 1 33 W-183 (80.9%) 4 45.645 7.1 0.130 23136 1 34 1+5 93.6633 7.1 0.285 23136 1 35 W-184 (94.5%) 1 45.2854 7.061 0.115 23136 1 36 4 45.6467 6.94 0.113 23136 1 37 5 44.7428 6.786 0.114 23136 1 38 6 44.9424 6.835 0.1145 23136 1 39 7 43.4668 6.82 0.111 23136 1 40 W-186 (96.9%) 2 45.4761 6.952 0.109 23136 1 41 3 45.8759 6.917 0.110 23136 1 42 4 44.7659 6.92 0.109 23136 1 43 METHOD (TOF) Different flight path lengths and repetition 23136 1 44 rates. 23136 1 45 1(TRN) Transmission measurement. 23136 1 46 -1ns pulse width with a repetition rate of 800Hz. 23136 1 47 Neutron beam was collimated to a 4.5cm diameter at 23136 1 48 the sample position. Background as a function of TOF 23136 1 49 can be derived by the 'black resonance' technique. 23136 1 50 - Shorter flight path of 25m with a 50Hz repetition 23136 1 51 rate - at low neutron energy part. 23136 1 52 2 Capture measurement. 23136 1 53 -30m (flight path 15) and 60m (flight path 14), GELINA 23136 1 54 operating at 800Hz. 23136 1 55 Additional runs using a sample holder, an aluminum 23136 1 56 canning dummy and Pb-208 sample in the beam in order to23136 1 57 determine the background originating from the sample 23136 1 58 holder and the scattered neutrons.Black resonance 23136 1 59 filters were placed in the beam for supplementary 23136 1 60 background control and B10 slab served as frame overlap23136 1 61 filter. 23136 1 62 -In a third set of experiments the samples were 23136 1 63 positioned at flight path 5, at a distance of 10m from 23136 1 64 the neutron production target. Repetition rate of 50Hz 23136 1 65 focusing on the thermal energy range of the neutron 23136 1 66 spectrum. 23136 1 67 -To normalize the capture yield the data obtained for 23136 1 68 flight paths 14 and 15, several runs having natural 23136 1 69 iron samples in the neutron beam were performed. The 23136 1 70 1.15keV resonance in Fe-56 was used for normalization. 23136 1 71 Additional runs with natural iron and tungsten disks 23136 1 72 were performed. Silver samples were used for the 50Hz 23136 1 73 runs at flight path 5 and the normalization factor was 23136 1 74 deduced after applying the saturated resonance 23136 1 75 technique. 23136 1 76 DETECTOR 1(GLASD) At 50m measuring station,neutrons were detected23136 1 77 by 0.635-cm-thick Li-6-loaded glass scintillator,viewed23136 1 78 by one photomultiplier placed outside of the neutron 23136 1 79 beam, at a distance of 49.33m . 23136 1 80 2(SCIN) In the first case two C6D6 detectors, 23136 1 81 for the longer distance four C6D6 are used to detect 23136 1 82 the capture gamma rays. 23136 1 83 (IOCH) At 80cm prior the detectors' array a B-10 loaded23136 1 84 ionization chamber served as a flux monitor. 23136 1 85 ANALYSIS The software code AGS (Analysis of Geel Spectra, 23136 1 86 C. Bastian et al.. AGS, Computer Code for Uncertainty 23136 1 87 Propagation in time of flight Cross Section Data, 23136 1 88 Physor 2006, Vancouver, Canada,2006) was used to reduce23136 1 89 the data. 23136 1 90 STATUS (UNOBT) Request of data sent 2011-07-22 to C.Lampoudis 23136 1 91 Christos.Lampoudis@ec.europa.eu - reply 24 Aug 2011: 23136 1 92 "The data will be available only after been fully 23136 1 93 analyzed." 23136 1 94 HISTORY (20110722C) M.M. 23136 1 95 (20130110U) On. INC-SOURCE: BRST -> PHOTO 23136 1 96 (20191107U) SD: Ref. added. 23136 1 97 ENDBIB 95 0 23136 1 98 NOCOMMON 0 0 23136 1 99 ENDSUBENT 98 0 23136 199999 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