ENTRY 32672 20120502 31553267200000001 SUBENT 32672001 20120502 31553267200100001 BIB 14 79 3267200100002 TITLE Cross-section measurement for the 67Zn(n,a)64Ni 3267200100003 reaction at 6.0 MeV 3267200100004 AUTHOR (Zhang Guohui, Wu Hao, Zhang Jiaguo, Liu Jiaming, 3267200100005 Chen Jinxiang, Yu.M.Gledenov, M.V.Sedysheva, 3267200100006 G.Khuukhenkhuu, P.J.Szalanski) 3267200100007 INSTITUTE (3CPRBJG,4ZZZDUB,3MGLNUM,3POLLOU) 3267200100008 REFERENCE (J,EPJ/A,43,1,2010) 3267200100009 #doi:10.1140/epja/i2009-10886-2 3267200100010 FACILITY (VDG,3CPRBJG) 4.5 MV Van de Graaff 3267200100011 SAMPLE (30-ZN-67,ENR=0.954) Two 67Zn samples were back-to- 3267200100012 back as a set. 3267200100013 The mass and the thickness of the forward sample were 3267200100014 9.864 mg and 680 ug/cm2. 3267200100015 The mass and the thickness of the backward sample were 3267200100016 6.818 mg and 470 ug/cm2. 3267200100017 Each sample was vacuum-evaporated on a tantalum 3267200100018 backing of 4.8 cm in diameter and 50 um in thickness. 3267200100019 DETECTOR (IOCH) A twin gridded ionization chamber composed of 3267200100020 two symmetric sections with a common cathod was used 3267200100021 as charged-particle detector. 3267200100022 The shape of the chamber is cylindrical, with diameter 3267200100023 28.2 cm and height 27.2 cm, and the thickness of the 3267200100024 stainless-steel wall is 2.0 mm. 3267200100025 The chamber has one cathode, two grids, two anodes and 3267200100026 two shields. 3267200100027 The shape of the electrodes is rectangular. 3267200100028 The cathode and the anode are aluminum boards coated 3267200100029 with tungsten layer, and the grid was composed of 3267200100030 parallel tungsten wires coated with gold 0.10 mm in 3267200100031 diameter and 2.0 mm in spacing. 3267200100032 The distances from the cathode to the grid, the grid 3267200100033 to the anode, and the anode to the shield were 44.0, 3267200100034 22.0 and 11.0 mm respectively. 3267200100035 The working gas was Kr+2.89%CO2 and the pressure was 3267200100036 1.85 atm. 3267200100037 The high voltages for the cathode, the grids and the 3267200100038 anodes were -2000, 0 and +1600 V, respectively. 3267200100039 (FISCH) A small parallel plate 238U fission chamber 3267200100040 placed between the gridded ionization chamber and the 3267200100041 gas target was used for absolute neutron flux 3267200100042 determination. 3267200100043 The abundance of the 238U isotope was better than 3267200100044 99.997%. 3267200100045 The diameter and mass of the 238U sample were 2.0 cm 3267200100046 and 547.2 (1+-1.3%) ug, respectively. 3267200100047 The working gas of the fission chamber was a flowing 3267200100048 Ar+3.73%CO2 gas with pressure slightly higher than 3267200100049 1.0 atm. 3267200100050 (BF3) A BF3 long counter was used as a neutron flux 3267200100051 monitor. 3267200100052 MONITOR (92-U-238(N,F),,SIG) 3267200100053 MONIT-REF (,,3,ENDF/B-VII.0,9237,2006) 3267200100054 INC-SOURCE (D-D) The deuterium gas cell was 2.0 cm in length and 3267200100055 0.9 cm in diameter with 5.0 micron molybdenum film 3267200100056 as window and fresh gold foil as beam stop. 3267200100057 The deuterium gas pressure was 2.9-3.1 atm during 3267200100058 experiment. 3267200100059 The deuteron beam energy before entering the 3267200100060 molybdenum film was 3.26 MeV. 3267200100061 From Monte Carlo simulation the average energy of 3267200100062 deuterons in the gas cell was 2.74 MeV, and the 3267200100063 corresponding energy of produced neutrons was 6.0 MeV.3267200100064 The neutron source intensity was about 3.3E+8 neutrons 3267200100065 per second. 3267200100066 PART-DET (A) 3267200100067 CORRECTION The final cross-section was already corrected for the 3267200100068 attenuation of the neutron flux through the 2 mm 3267200100069 thick stainless wall of the ionization chamber using 3267200100070 the total neutron cross-section of 56Fe in the 3267200100071 ENFD/B-VII.0 library. 3267200100072 ERR-ANALYS (ERR-T) Total uncertainty of cross sections (15%) 3267200100073 (ERR-1) alpha events Na (14%) 3267200100074 (ERR-2) neutron flux density ratio K (3%) 3267200100075 (ERR-3) fission constant Nf (2%) 3267200100076 (ERR-4) the number of the 67Zn atoms in sample (1.5%) 3267200100077 (ERR-5) the number of the U238 atoms in sample (1.3%) 3267200100078 (MONIT-ERR) 238U(n,f) cross-section (1%) 3267200100079 HISTORY (20100921C) Complied by Wu Zhendong. 3267200100080 (20120502U) On. SAMPLE: 30-Zn-67 -> 30-ZN-67 3267200100081 ENDBIB 79 0 3267200100082 COMMON 6 3 3267200100083 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 MONIT-ERR 3267200100084 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 3267200100085 14. 3. 2. 1.5 1.3 1. 3267200100086 ENDCOMMON 3 0 3267200100087 ENDSUBENT 86 0 3267200199999 SUBENT 32672002 20100921 31483267200200001 BIB 2 2 3267200200002 REACTION (30-ZN-67(N,A)28-NI-64,,SIG) 3267200200003 STATUS (TABLE)From text in J,EPJ/A,43,3,2010. 3267200200004 ENDBIB 2 0 3267200200005 NOCOMMON 0 0 3267200200006 DATA 3 1 3267200200007 EN DATA ERR-T 3267200200008 MEV MB PER-CENT 3267200200009 6. 7.3 15. 3267200200010 ENDDATA 3 0 3267200200011 ENDSUBENT 10 0 3267200299999 ENDENTRY 2 0 3267299999999