ENTRY 23215 20131221 22392321500000001 SUBENT 23215001 20131221 22392321500100001 BIB 10 49 2321500100002 TITLE Measurement of Fission Cross-Sections with Lead 2321500100003 Slowing-down Spectrometer using Digital Signal 2321500100004 Processing. 2321500100005 AUTHOR (W.Takahashi, T.Oishi, M.Nakhostin, T.Yamauchi,M.Baba, 2321500100006 J.Hori, H.Yuki, T.Ohtsuki) 2321500100007 REFERENCE (S,JAEA-C-2006-009,106,2006) 2321500100008 INSTITUTE (2JPNTOH) W.Takahashi, T.Oishi, M.Nakhostin,T.Yamauchi,2321500100009 M.Baba, H.Yuki, T.Ohtsuki. 2321500100010 (2JPNKTO) J.Hori. 2321500100011 FACILITY (LINAC,2JPNKTO) Kyoto University lead slowing-down 2321500100012 spectrometer driven by an electron linac (KULS) at 2321500100013 KURRI. KULS is a cube of 1.5x1.5x1.5 m3, composed of 2321500100014 lead blocks (10x10x20 cm3, purity 99.9%), set on a 2321500100015 steel platform cart in the linac target room. All 2321500100016 surfaces of KULS are covered with Cd sheets of 0.5 mm 2321500100017 thick to shield from low energy neutrons. 2321500100018 The energy calibration of KULS was done by : 2321500100019 - BF3 counter for the neutron transmission measurement 2321500100020 through a resonance filters indium or cobalt, 2321500100021 - Ar gas counter for the capture gamma-ray measurement 2321500100022 with a resonance filter of Au, Cu or Al. 2321500100023 Pulse width of electron beam was generally 33 ns (FWHM)2321500100024 and the frequency was 100 Hz as the optimum value. 2321500100025 The beam current on the target was around 10.5 to 12.4 2321500100026 microA. 2321500100027 INC-SOURCE (PHOTO) Pulsed fast neutrons are produced by a 2321500100028 photoneutron target of tantalum (8 cm diameter,6 cm 2321500100029 effective thickness) in cylindrical Ti case, which is 2321500100030 air-cooled with compressed air. 2321500100031 DETECTOR (IOCH) Back-to-back (BTB, backsides of MA and 235U 2321500100032 deposits face each other) type double fission 2321500100033 ionization chamber with two parallel plate electrodes 2321500100034 was employed for the detection of fission events; made 2321500100035 of Al, 2 mm thick, 40 mm diameter, 43 mm length. 2321500100036 Distance between the electrode and the deposit is 8 mm.2321500100037 Ar + CO(2) gas is flowed through the BTB chamber. 2321500100038 SAMPLE Number of atoms for sample deposits was determined 2321500100039 through low-geometry alpha-counting: 2321500100040 U-235 - 10 microg, (2.80+-0.10)E+16 2321500100041 Np-237 - (1.99+-0.02)E+17 2321500100042 U-235 - 5 microg, (1.51+-0.03)E+16 2321500100043 Am-241 - (1.73+-0.02)E+16 2321500100044 METHOD (SLODT,PHD) The pulse height data and the slowing-down 2321500100045 time data were acquired by processing the waveform 2321500100046 data. The fission fragment pulses were discriminated 2321500100047 from the alpha-particles pulses by the pulse height. 2321500100048 HISTORY (20131221C) M.M. 2321500100049 Request for the data was sent 07.02.2014 to author 2321500100050 W.Takahashi. 2321500100051 ENDBIB 49 0 2321500100052 NOCOMMON 0 0 2321500100053 ENDSUBENT 52 0 2321500199999 SUBENT 23215002 20131221 22392321500200001 BIB 3 5 2321500200002 REACTION (93-NP-237(N,F),,SIG,,SDT) 2321500200003 REL-REF (A,22423002,T.Iwasaki+,J,NST,36,(2),127,1999) 2321500200004 (A,22731002,A.Yamanaka+,J,NST,30,863,1993) 2321500200005 STATUS (UNOBT) 2321500200006 Data are on Fig.4 of S,JAEA-C-2006-009,106,2006 . 2321500200007 ENDBIB 5 0 2321500200008 NOCOMMON 0 0 2321500200009 NODATA 0 0 2321500200010 ENDSUBENT 9 0 2321500299999 SUBENT 23215003 20131221 22392321500300001 BIB 3 4 2321500300002 REACTION (95-AM-241(N,F),,SIG,,SDT) 2321500300003 REL-REF (A,22479002,S.Yamamoto,J,NSE,126,(2),201,1997) 2321500300004 STATUS (UNOBT) 2321500300005 Data are on Fig.5 of S,JAEA-C-2006-009,106,2006 . 2321500300006 ENDBIB 4 0 2321500300007 NOCOMMON 0 0 2321500300008 NODATA 0 0 2321500300009 ENDSUBENT 8 0 2321500399999 ENDENTRY 3 0 2321599999999