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