ENTRY F0710 20120409 F047F071000000001 SUBENT F0710001 20120409 F047F071000100001 BIB 14 49 F071000100002 TITLE Fast neutron yield from 20-MeV tritons on water. F071000100003 Part 1. Triton interaction with light water. F071000100004 AUTHOR (M.Drosg,D.M.Drake) F071000100005 INSTITUTE (2AUSTHV,1USALAS) F071000100006 REFERENCE (J,NIM/B,73,387,1993) F071000100007 FACILITY (VDGT,1USALAS) F071000100008 INC-SPECT Current of the bunched triton beam was held below 4 nA.F071000100009 SAMPLE Water target was solid (ice) in a thin-walled stainlessF071000100010 steel cup with one face in direct contact with the F071000100011 accelerator vacuum. Cooling the target from the F071000100012 outside by direct contact with liquid nitrogen in a F071000100013 small cryostat of styrofoam maintained the solid phase F071000100014 of the water. F071000100015 DETECTOR (SCIN) 2x2 in. liquid scintillator (NE213) was used. F071000100016 METHOD (TOF) Two pulse-height biases were used simultaneously F071000100017 (Compton edge of Cs-137 and of Na-22). The flight pathF071000100018 was 3.53 m, the total time resolution was 2.1 ns. F071000100019 ANALYSIS Cross sections were derived from the high-energy F071000100020 portions of the yield curves. F071000100021 MONITOR (1-H-1(T,N)2-HE-3,,DA) By comparing the measured yield F071000100022 from this reaction with the calculated yield the F071000100023 experimental setup was calibrated. Standard gas targetsF071000100024 were used. F071000100025 Energy dependence of the efficiency of the neutron F071000100026 detector was determined by measuring neutron yields of F071000100027 the reactions H-2(t,n)He-4 and H-1(t,n)He-3 at about 30F071000100028 energy points between 2.2 and 36.9 MeV and comparing F071000100029 them with well-known cross sections. F071000100030 CORRECTION The attenuation correction due to nonelastic processed F071000100031 is quite small and introduces negligible errors. F071000100032 However, multiple scattering in the target and its F071000100033 structure which was not corrected for is estimated to F071000100034 affect the data by as much as 4%. F071000100035 ERR-ANALYS (ERR-S) Errors given in a table are from counting F071000100036 statistics only. F071000100037 Common scale error is composed of 3.5% calibration F071000100038 error, the current integrator calibration error (<0.5%)F071000100039 and the systematic portion of the attenuation error F071000100040 (<0.5%), adding up to about 4%. F071000100041 Uncertainty of the specific energy loss of the tritons F071000100042 in water contributes to the common scale error. F071000100043 Uncertainty of the zero-degree position was +-0.2 F071000100044 degree. F071000100045 Uncertainties in the integrated charge and in the dead F071000100046 time were each < 0.5%. F071000100047 HISTORY (20050411C) F071000100048 (20120409A) E-LVL=0 in Sub 001 was added, ERR-ANALYS F071000100049 code in Sub 001,002 was changed, REACTION code in F071000100050 Sub 002 was changed. F071000100051 ENDBIB 49 0 F071000100052 COMMON 3 3 F071000100053 E-LVL EN-RSL ANG-RSL F071000100054 MEV MEV ADEG F071000100055 0. 0.04 0.2 F071000100056 ENDCOMMON 3 0 F071000100057 ENDSUBENT 56 0 F071000199999 SUBENT F0710002 20120409 F047F071000200001 BIB 2 2 F071000200002 REACTION (8-O-16(T,N)9-F-18,PAR,DA) F071000200003 STATUS (TABLE) Table 2 F071000200004 ENDBIB 2 0 F071000200005 NOCOMMON 0 0 F071000200006 DATA 4 20 F071000200007 EN ANG DATA ERR-S F071000200008 MEV ADEG MB/SR PER-CENT F071000200009 16.5 0. 33. 4.7 F071000200010 16.5 15. 18.3 7. F071000200011 16.5 30. 8.7 9.2 F071000200012 16.5 45. 5.4 9.9 F071000200013 16.5 60. 2.5 14. F071000200014 17.5 0. 22.2 5.4 F071000200015 17.5 15. 12.2 8.1 F071000200016 17.5 30. 7.7 8.9 F071000200017 17.5 45. 4.9 12. F071000200018 17.5 60. 2.4 13. F071000200019 18.5 0. 18. 5.7 F071000200020 18.5 15. 9. 8.5 F071000200021 18.5 30. 5.3 9.8 F071000200022 18.5 45. 3.4 14. F071000200023 18.5 60. 2. 16.5 F071000200024 19.5 0. 19. 10. F071000200025 19.5 15. 6.4 9.7 F071000200026 19.5 30. 4.4 11. F071000200027 19.5 45. 1.7 22. F071000200028 19.5 60. 1.3 21. F071000200029 ENDDATA 22 0 F071000200030 ENDSUBENT 29 0 F071000299999 ENDENTRY 2 0 F071099999999