ENTRY 32216 20080729 3221600000001 SUBENT 32216001 20080729 20080828 3221600100001 BIB 13 68 3221600100002 INSTITUTE (4UKRIJD) 3221600100003 REFERENCE (C,2007NICE,1,543,2007) 3221600100004 AUTHOR (O.Gritzay,V.Kolotyi,N.Klimova,O.Kalchenko,M.Gnidak, 3221600100005 P.Vorona) 3221600100006 TITLE The total neutron cross section for natural carbon in 3221600100007 the energy range 2 to 148 keV 3221600100008 FACILITY (REAC) Reactor WWR-M 3221600100009 INC-SOURCE (REAC) Neutron filters installed in horizontal channel 3221600100010 of the reactor. 3221600100011 INC-SPECT 1)Filter 2 keV. Average energy of filtered neutron 3221600100012 spectrum 2.004 keV,filter components(Sc, 60Ni, 54Fe, 3221600100013 Al, S, Co, 10B ),purity of beam about 99.92%, other 3221600100014 additions to the main spectra were negligible: 43 keV -3221600100015 0.06%, 65 keV - 0.02%.The limits of 95% response 3221600100016 function for the 2 keV filter spectrum were defined as 3221600100017 1.051 to 2.710 keV. 3221600100018 2)Filter 3.5 keV. Average energy of filtered neutron 3221600100019 spectrum 3.267 keV,filter components(60Ni, 54Fe, 10B, 3221600100020 Al, S),purity of beam about 98.7%, other additions to 3221600100021 the main spectra were: 43 keV - 0.5%, 65 keV - 0.3%, 3221600100022 87 keV - 0.1%. The limits of 95% response function for 3221600100023 the 3.5 keV filter spectrum were defined as 0.438 to 3221600100024 4.409 keV. 3221600100025 3)Filter 13 keV. Average energy of filtered neutron 3221600100026 spectrum 12.738 keV,filter components(58Ni,57Fe,10B,Al,3221600100027 S,Si),purity of beam about 98.3%, other additions to 3221600100028 the main spectra were: (60-70) keV-1.7%, 270 keV-0.2%. 3221600100029 The limits of 95% response function for the 13 keV 3221600100030 filter spectrum were defined as 12.537 to 13.448 keV. 3221600100031 4)Filter 134 keV. Average energy of filtered neutron 3221600100032 spectrum 133.59 keV,filter components(58Cr, 58,60Ni, 3221600100033 Al,Si,10B),purity of beam about 99.8%, other additions 3221600100034 to the main spectra were: 13 keV- 0.01%, 60 keV- 0.02%,3221600100035 155 keV - 0.02%. The limits of 95% response function 3221600100036 for the 134 keV filter spectrum were defined as 132.2063221600100037 to 135.325 keV. 3221600100038 METHOD (FNB) 3221600100039 DETECTOR (PROPC)For neutron energies equal and less than 13 keV,3221600100040 the He-3 counters: a) CHM-37 (diameter-18mm, 3221600100041 length-500 mm, gas pressure-7 atm); b) LND 2527 (dia- 3221600100042 meter-25.4 mm,length-386.84 mm,gas pressure-20 atm) 3221600100043 For neutron energies equal and more than 13 keV, the 3221600100044 hydrogen recoil counters: a) CHM-38 (Gas filling-90% H23221600100045 + 9.56% CH4 + 0.44% 3He2,diameter-30 mm,length-300 mm, 3221600100046 gas pressure-4 atm); b) LND 281 (Gas filling- H+CH4+N2,3221600100047 diameter-38.1 mm,length-254 mm, gas pressure-4.3 atm). 3221600100048 SAMPLE Three types of natural carbon samples: 3221600100049 a)solid samples from reactor graphite(C99.9%); 3221600100050 b)powder samples, loaded into Al container with 3221600100051 internal diameter 31.75mm(C99.9%); 3221600100052 c)carbon disks, each of them has thickness 1mm and 3221600100053 diameter 30.4mm(C99.997%) 3221600100054 1)Filter 2 keV. Six samples of reactor graphite thick 3221600100055 0.044657, 0.047326, 0.127593, 0.172569 atom/b (type a) 3221600100056 and 0.186890, 0.247653 atom/b (type b). 3221600100057 2)Filter 3.5 keV. Two samples thick 0.00888+-0.00001 3221600100058 and 0.02663+-0.00002 atom/b (type c). 3221600100059 3)Filter 13 keV. One sample thick 0.127593 +- 0.000010 3221600100060 atom/b (type c). 3221600100061 4)Filter 134 keV. Two samples thick 0.00887+-0.000012 3221600100062 and 0.02660+-0.00026 atom/b (type c). 3221600100063 ERR-ANALYS (ERR-T)Total error includes: 3221600100064 statistical error of the transmission measurements; 3221600100065 meausurement errors of dimension and weight of the 3221600100066 sample 3221600100067 STATUS (TABLE) 3221600100068 HISTORY (20070606) UKRNDC 3221600100069 (20080724A) SD. Reference on Conf.Proc. was added. 3221600100070 ENDBIB 68 0 3221600100071 NOCOMMON 0 0 3221600100072 ENDSUBENT 71 0 3221600199999 SUBENT 32216002 20070614 20070809 3221600200001 BIB 1 1 3221600200002 REACTION (6-C-0(N,TOT),,SIG,,AV) 3221600200003 ENDBIB 1 0 3221600200004 NOCOMMON 0 0 3221600200005 DATA 4 4 3221600200006 EN-MIN EN-MAX DATA ERR-T 3221600200007 KEV KEV B B 3221600200008 0.438 4.409 4.635 0.110 3221600200009 1.051 2.710 4.674 0.021 3221600200010 12.537 13.448 4.714 0.046 3221600200011 132.206 135.325 4.265 0.014 3221600200012 ENDDATA 6 0 3221600200013 ENDSUBENT 12 0 3221600299999 ENDENTRY 2 0 3221699999999