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