ENTRY 32676 20100510 31463267600000001 SUBENT 32676001 20100510 31463267600100001 BIB 14 64 3267600100002 TITLE Cross-Section Measurement for the 95Mo(n,a)92Zr 3267600100003 Reaction at 4.0, 5.0 and 6.0 MeV 3267600100004 AUTHOR (Guohui Zhang,Hao Wu,Jiaguo Zhang,Jiaming Liu, 3267600100005 Yuxiang Yin,Jinxiang Chen,Yu.M.Gledenov,M.V.Sedysheva, 3267600100006 G.Khuukhenkhuu,P.E.Koehler,P.J.Szalanski) 3267600100007 INSTITUTE (3CPRBJG,4ZZZDUB,3MGLNUM,1USAORL,3POLLOU) 3267600100008 REFERENCE (J,ARI,68,180,2010) Main reference 3267600100009 (S,ISINN-17,331,2010) Preliminary data given 3267600100010 FACILITY (VDG,3CPRBJG) The 4.5-MV Van de Graaff accelerator 3267600100011 of the Institute of Heavy Ion Physics, Peking 3267600100012 University. 3267600100013 INC-SOURCE (D-D) Monoenergetic neutrons were produced through 3267600100014 the D(d,n)3He reaction with a deuterium gas target, 3267600100015 2.0 cm in length and 0.9 cm in diameter. The gas cell 3267600100016 was separated from the vacuum tube by a molybdenum 3267600100017 foil 5 mu-m in thickness. The pressure range was 3267600100018 3.14x10**5-2.94x10**5 Pa. The energies of the deuteron 3267600100019 beam before enter the foil were 1.79, 2.46 and 3267600100020 3.26 MeV, and the neutron energies were 4.0, 5.0 3267600100021 and 6.0 MeV, with energy spreads 0.23, 0.16 and 3267600100022 0.12 MeV, respectively. 3267600100023 DETECTOR (IOCH) Twin-gridded ionization chamber. 3267600100024 The shape is cylindrical, 29.0 cm in height, 37.0 cm 3267600100025 in diameter, and 2.0 mm in thickness. The grids 3267600100026 were composed of gilded parallel tungsten wires, 3267600100027 0.10 mm in diameter and 2.0 mm in spacing, and the 3267600100028 effective area is 16x18 cm2. Distances from the 3267600100029 cathode to grid and from the grid to anode were 75 3267600100030 and 20 mm, respectively. The working gas was 3267600100031 Kr + 2.89%CO2. The pressures of the working gas was 3267600100032 1.37x10**5 Pa. 3267600100033 (BF3) A BF3 long counter was used as a neutron flux 3267600100034 monitor. 3267600100035 PART-DET (A)Alphas 3267600100036 SAMPLE (42-MO-95,ENR=0.968) 3267600100037 Two 95Mo samples (The thickness and diameter for each 3267600100038 sample are 5.0 mg/cm2 and 11.0 cm)attached back-to-back3267600100039 to the common cathode were used for simultaneous alpha 3267600100040 event measurements of forward (0 to 90 deg) and 3267600100041 backward (90 to 180 deg) angles. The isotopic 3267600100042 abundance of the 95Mo samples was 96.8%. The backings 3267600100043 are aluminum sheets 0.127 mm in thickness. 3267600100044 MONITOR (92-U-238(N,F),,SIG) Taken from the ENDF/B-VII.0. 3267600100045 The absolute neutron flux was determined by 3267600100046 measuring the fission rate with a 238U foil (2.0 cm 3267600100047 in diameter, 547.2 +- 7.1 mu-g in mass , and 99.997% 3267600100048 in abundance)placed at the third position of the 3267600100049 sample changer. The working gas of the fission chamber 3267600100050 was flowing Ar+2.85%CO2 gas, and the pressure slightly 3267600100051 higher than atmospheric pressure. 3267600100052 MONIT-REF (,,3,ENDF/B-VII.0,9237,2006) 3267600100053 ERR-ANALYS (ERR-T) Total uncertainty in cross section (10%) 3267600100054 (ERR-S,6.5,10.) Total uncertainty in alpha counts 3267600100055 * Statistics (2.1-2.8%) 3267600100056 * Background subtraction (4-5%) 3267600100057 (ERR-1) - 238U fission count 3267600100058 (ERR-2) - 238U and 95Mo neutron flux density ratio 3267600100059 (ERR-3) - 238U fission cross section 3267600100060 (ERR-4) - Atom number of 95Mo 3267600100061 (ERR-5) - Atom number of 238U 3267600100062 STATUS (TABLE) Data taken from Table 1 of J,ARI,68,180,2010 3267600100063 HISTORY (20100510C)Compiled by Jimin WANG 3267600100064 (20100824U)Updated the reference and confirmed the 3267600100065 experimental results by Guochang CHEN 3267600100066 ENDBIB 64 0 3267600100067 COMMON 5 3 3267600100068 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 3267600100069 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 3267600100070 2.0 3.0 1.0 1.5 1.3 3267600100071 ENDCOMMON 3 0 3267600100072 ENDSUBENT 71 0 3267600199999 SUBENT 32676002 20100510 31463267600200001 BIB 1 1 3267600200002 REACTION (42-MO-95(N,A)40-ZR-92,,SIG) 3267600200003 ENDBIB 1 0 3267600200004 NOCOMMON 0 0 3267600200005 DATA 5 3 3267600200006 EN EN-ERR DATA ERR-T MONIT 3267600200007 MEV MEV MB MB MB 3267600200008 4.0 0.23 0.70 0.07 554.4011 3267600200009 5.0 0.16 1.22 0.12 546.7115 3267600200010 6.0 0.12 1.70 0.17 610.7900 3267600200011 ENDDATA 5 0 3267600200012 ENDSUBENT 11 0 3267600299999 ENDENTRY 2 0 3267699999999