ENTRY 32915 20241015 3291500000001
SUBENT 32915001 20241015 20250110 3291500100001
BIB 15 42 3291500100002
TITLE Measurement of neutron-induced fission cross sections 3291500100003
of 235U and 238U relative to n-p scattering at CSNS 3291500100004
Back-n facility 3291500100005
AUTHOR (Yonghao Chen,Yiwei Yang,Zhizhou Ren,Wei Jiang, 3291500100006
Ruirui Fan,Han Yi,Rong Liu,Jingyu Tang,Hantao Jing, 3291500100007
Yang Li,Qiang Li,Zhixin Tan) 3291500100008
INSTITUTE (3CPRIHP,3CPRNPC,3CPRHST) 3291500100009
REFERENCE (J,EPJ/CS,284,01013,2023) preliminary results 3291500100010
#doi:10.1051/epjconf/202328401013 3291500100011
FACILITY (SYNCH,3CPRIHP) Back-n white neutron source of China 3291500100012
Spallation Neutron Source (CSNS) 3291500100013
INC-SOURCE (SPALL) Spallation neutrons are generated by 3291500100014
bombarding 1.6 GeV protons to a thick tungsten target 3291500100015
with a 25-Hz repetition frequency. 3291500100016
DETECTOR (FISCH) A fission ionization chamber for the cross- 3291500100017
section measurement (FIXM) was upstream placed. 3291500100018
(TELES) Proton recoil telescopes (PRTs) were 3291500100019
downstream installed in a chamber after FIXM for 3291500100020
measuring the n-p scattering. The chamber was 3291500100021
maintained at 5E-3 Pa during the measurement. 3291500100022
SAMPLE Two 235U and two 238U samples were mounted in the 3291500100023
chamber. All the samples inside FIXM are circular in 3291500100024
diameters of 50 mm with masses of a few milligrams. 3291500100025
METHOD (TOF) The detectors were installed at Back-n end 3291500100026
station 1, which was about 57 meters away from the 3291500100027
spallation target. 3291500100028
MONITOR (1-H-1(N,EL)1-H-1,,SIG) 3291500100029
MONIT-REF (,A.D.Carlson+,J,NDS,148,143,2018) 3291500100030
The n-p scattering cross sections are taken from 3291500100031
IAEA standards below 20 MeV. 3291500100032
(,,3,JEFF-3.1.2,,2012) The n-p scattering cross 3291500100033
sections are taken from JEFF-3.1.2 above 20 MeV. 3291500100034
ANALYSIS A shape measurement was done, and the 235, 238U(n,f) 3291500100035
cross sections were normalized to the IAEA standards 3291500100036
at 14.5 MeV. 3291500100037
ERR-ANALYS (ERR-S) The statistical errors of this work are 3291500100038
ranging from less than 1% up to 6%. 3291500100039
STATUS (PRELM) 3291500100040
(TABLE,,Yonghao Chen+,J,EPJ/CS,284,01013,2023) 3291500100041
Data presented by author 3291500100042
HISTORY (20240930R) The data received from Yonghao Chen 3291500100043
(20241015C) Yang Su (CNDC) 3291500100044
ENDBIB 42 0 3291500100045
NOCOMMON 0 0 3291500100046
ENDSUBENT 45 0 3291500199999
SUBENT 32915002 20241015 20250110 3291500200001
BIB 2 2 3291500200002
REACTION (92-U-235(N,F),,SIG) 3291500200003
MONITOR ((MONIT)92-U-235(N,F),,SIG) 3291500200004
ENDBIB 2 0 3291500200005
COMMON 2 3 3291500200006
EN-NRM MONIT 3291500200007
MEV B 3291500200008
14.5 2.090 3291500200009
ENDCOMMON 3 0 3291500200010
DATA 4 23 3291500200011
EN EN-RSL DATA ERR-S 3291500200012
MEV MEV B B 3291500200013
10.5000 0.5000 1.7530 0.0118 3291500200014
11.5000 0.5000 1.7017 0.0129 3291500200015
12.5000 0.5000 1.7926 0.0153 3291500200016
13.5000 0.5000 1.9674 0.0184 3291500200017
14.5000 0.5000 2.0900 0.0214 3291500200018
15.5000 0.5000 2.0492 0.0224 3291500200019
16.5000 0.5000 2.1858 0.0269 3291500200020
17.5000 0.5000 2.1672 0.0290 3291500200021
18.5000 0.5000 2.1135 0.0307 3291500200022
19.5000 0.5000 2.1689 0.0343 3291500200023
21.9008 1.0079 2.0705 0.0262 3291500200024
24.0138 1.1051 2.0661 0.0291 3291500200025
26.3306 1.2117 2.1405 0.0353 3291500200026
28.8709 1.3286 2.1736 0.0387 3291500200027
31.6563 1.4568 2.1997 0.0449 3291500200028
34.7105 1.5973 1.9858 0.0439 3291500200029
38.0593 1.7515 1.9351 0.0488 3291500200030
41.7312 1.9204 2.0203 0.0606 3291500200031
45.7573 2.1057 1.9618 0.0691 3291500200032
50.1719 2.3089 1.8987 0.0751 3291500200033
55.0124 2.5316 1.8798 0.0886 3291500200034
60.3199 2.7759 1.8634 0.1027 3291500200035
66.1394 3.0437 1.8274 0.1081 3291500200036
ENDDATA 25 0 3291500200037
ENDSUBENT 36 0 3291500299999
SUBENT 32915003 20241016 20250110 3291500300001
BIB 2 2 3291500300002
REACTION (92-U-238(N,F),,SIG) 3291500300003
MONITOR ((MONIT)92-U-238(N,F),,SIG) 3291500300004
ENDBIB 2 0 3291500300005
COMMON 2 3 3291500300006
EN-NRM MONIT 3291500300007
MEV B 3291500300008
14.5 1.190 3291500300009
ENDCOMMON 3 0 3291500300010
DATA 4 23 3291500300011
EN EN-RSL DATA ERR-S 3291500300012
MEV MEV B B 3291500300013
10.5000 0.5000 1.0278 0.0079 3291500300014
11.5000 0.5000 1.0109 0.0086 3291500300015
12.5000 0.5000 1.0073 0.0097 3291500300016
13.5000 0.5000 1.0872 0.0114 3291500300017
14.5000 0.5000 1.1900 0.0134 3291500300018
15.5000 0.5000 1.2030 0.0143 3291500300019
16.5000 0.5000 1.3254 0.0176 3291500300020
17.5000 0.5000 1.3601 0.0194 3291500300021
18.5000 0.5000 1.4034 0.0215 3291500300022
19.5000 0.5000 1.4675 0.0243 3291500300023
21.9008 1.0079 1.5215 0.0199 3291500300024
24.0138 1.1051 1.5156 0.0220 3291500300025
26.3306 1.2117 1.5776 0.0266 3291500300026
28.8709 1.3286 1.6665 0.0302 3291500300027
31.6563 1.4568 1.7623 0.0365 3291500300028
34.7105 1.5973 1.5995 0.0357 3291500300029
38.0593 1.7515 1.5892 0.0404 3291500300030
41.7312 1.9204 1.6928 0.0510 3291500300031
45.7573 2.1057 1.6666 0.0589 3291500300032
50.1719 2.3089 1.6416 0.0651 3291500300033
55.0124 2.5316 1.6169 0.0764 3291500300034
60.3199 2.7759 1.6250 0.0897 3291500300035
66.1394 3.0437 1.5997 0.0948 3291500300036
ENDDATA 25 0 3291500300037
ENDSUBENT 36 0 3291500399999
ENDENTRY 3 0 3291599999999