ENTRY 14384 20140403 13991438400000001
SUBENT 14384001 20140403 13991438400100001
BIB 10 39 1438400100002
TITLE A new neutron counter for fission research 1438400100003
AUTHOR (B.Laurent,T.Granier,G.Belier,A.Chatillon,J.-F.Martin, 1438400100004
J.Taieb,F.-J.Hambsch,F.Tovesson,A.B.Laptev,R.C.Haight, 1438400100005
R.O.Nelson,J.M.O'Donnell) 1438400100006
INSTITUTE (2FR BRC,2ZZZGEL,1USALAS) 1438400100007
REFERENCE (J,NIM/A,745,99,2014) 1438400100008
FACILITY (LINAC,1USALAS) Experiment performed at the 800 MeV 1438400100009
proton linac of the Lujan Neutron Scattering Center 1438400100010
at LANSCE 1438400100011
SAMPLE Thin deposit containing 1mg of 238U. Sample was 1438400100012
placed inside of the ionization chamber. 1438400100013
DETECTOR (HE3SP) Neutron detector consists of 30 cylindrical 3He1438400100014
proportional counters arranged in two concentric 1438400100015
rings within a high-density polyethylene matrix. 1438400100016
Twelve 3He tubes with a diameter of 2.54cm,an active 1438400100017
length of 30 cm and 10 bar of gas pressure, and 1438400100018
eighteen tubes with a diameter of 2.54cm, an active 1438400100019
length of 45cm and 4 bar of gas pressure were used in 1438400100020
this setup. The inner detector ring corresponds to a 1438400100021
13.5 cm radius and is composed of twelve high 1438400100022
pressure and six low pressure tubes.The twelve 1438400100023
remaining lower pressure tubes constitute the second 1438400100024
ring which has a 19 cm radius. The polyethylene 1438400100025
matrix is a rectangular block with a square section 1438400100026
of 50 cm side and 75 cm long 1438400100027
(IOCH) Both fission fragments were detected by a 1438400100028
double Frisch- gridded ionization chamber, with 1438400100029
contained 238U sample 1438400100030
METHOD (TOF) Energy of primary neutrons was determined by time1438400100031
of flight. Neutron flight path was about 10 m. The 1438400100032
proton beam was delivered in subnanosecond micropulses 1438400100033
emitted every 1.8 mu-s within macropulses of 625 mu-s 1438400100034
long at a 40Hz repetition rate 1438400100035
INC-SOURCE (SPALL) Spallation neutrons were produced by a pulsed 1438400100036
800 MeV proton beam with a repetition rate of 20 Hz 1438400100037
impinging on a pair of tungsten targets. Neutrons are 1438400100038
reflected by the moderator and travel down a 20.2-m 1438400100039
flight path to the target location. 1438400100040
HISTORY (20140403C) Compiled by S.H. 1438400100041
ENDBIB 39 0 1438400100042
NOCOMMON 0 0 1438400100043
ENDSUBENT 42 0 1438400199999
SUBENT 14384002 20140403 13991438400200001
BIB 4 7 1438400200002
REACTION (92-U-238(N,F),PR,NU) 1438400200003
STATUS (TABLE) Data presented in fig. 13 of the reference 1438400200004
sent by author (B.L.) 1438400200005
ERR-ANALYS (ERR-S) Statistical uncertainty 1438400200006
ANALYSIS Prompt fission neutron multiplicity is given by the 1438400200007
integral of the background subtracted spectrum 1438400200008
divided by the detection efficiency. 1438400200009
ENDBIB 7 0 1438400200010
NOCOMMON 0 0 1438400200011
DATA 3 21 1438400200012
EN DATA ERR-S 1438400200013
MEV PRT/FIS PRT/FIS 1438400200014
1.39057 2.50296 0.355338 1438400200015
1.58525 2.89963 0.249436 1438400200016
1.80719 2.47254 0.208494 1438400200017
2.06019 2.77328 0.196131 1438400200018
2.34862 2.76306 0.185854 1438400200019
2.67743 2.64286 0.185945 1438400200020
3.05227 2.61352 0.181496 1438400200021
3.47958 2.33066 0.186384 1438400200022
3.96673 2.78304 0.171980 1438400200023
4.52207 2.92825 0.167301 1438400200024
5.15516 2.87890 0.159823 1438400200025
5.87688 3.19902 0.154175 1438400200026
6.69964 3.29485 0.128396 1438400200027
7.63759 3.52655 0.134278 1438400200028
8.70686 3.68242 0.136136 1438400200029
9.92582 3.86793 0.145246 1438400200030
11.3154 3.81355 0.155891 1438400200031
12.8996 4.39874 0.160402 1438400200032
14.7055 4.69169 0.158944 1438400200033
16.7643 4.87619 0.154534 1438400200034
19.1113 5.20817 0.153385 1438400200035
ENDDATA 23 0 1438400200036
ENDSUBENT 35 0 1438400299999
ENDENTRY 2 0 1438499999999