ENTRY 32684 20110816 31513268400000001 SUBENT 32684001 20110816 31513268400100001 BIB 14 70 3268400100002 TITLE Differential cross section for neutron scattering 3268400100003 from 209Bi at 37 MeV and the weak particle-core 3268400100004 coupling 3268400100005 AUTHOR (Zuying Zhou,Xichao Ruan,Yanfeng Du,Bujia Qi, 3268400100006 Hongqing Tang,Haihong Xia,R.L.Walter,R.T.Braun, 3268400100007 C.R.Howell,W.Tornow,G.J.Weisel,M.Dupuis, 3268400100008 J.P.Delaroche,Zemin Chen,Zhenpeng Chen,Yingtang Chen) 3268400100009 INSTITUTE (3CPRAEP,1USADKE,1USATNL,2FR FR,3CPRTSI) 3268400100010 REFERENCE (J,PR/C,82,024601,2010) 3268400100011 #doi:10.1103/PhysRevC.82.024601 3268400100012 METHOD (TOF,BCINT,PSD) The measured raw TOF spectra are 3268400100013 included sample-in and sample-out to determine the 3268400100014 background. The flight paths for 3 main detectors are 3268400100015 609, 654 and 515 cm, respectively. To obtain absolute 3268400100016 differential cross-section data, determined the 3268400100017 neutron flux per area at the location of the bismuth 3268400100018 target. 3268400100019 FACILITY (VDGT,3CPRAEP) The 13MV HI-13 Tandem Accelerator in 3268400100020 China Institute of Atomic Energy (CIAE). 3268400100021 DETECTOR (SCIN) Three main detectors ST-451 10.4 x 5.0 cm in 3268400100022 diameter and thickness were used. Each detector was 3268400100023 well collimated and massively shielded. For the 3268400100024 measurements at angles less than 30 deg., only one 3268400100025 detector was used because of the difficulty of 3268400100026 shielding from the primary neutrons. 3268400100027 CORRECTION The corrections due to the finite-geometry sample 3268400100028 size effects, flux attenuation, multiple scattering, 3268400100029 etc., were made with Monte Carlo simulation. 3268400100030 INC-SOURCE (D-T) The 4-MHz pulsed deuteron beam was provided by 3268400100031 the HI-13 tandem accelerator. The deuteron beam 3268400100032 current delivered to the tritium gas target was 2.5 3268400100033 microampere. Tritium gas target contains tritium gas 3268400100034 cell and helium gas cell, which is a stainless-steel 3268400100035 cylinder. 3268400100036 1)Tritium gas cell: 4.6 x 1.2 cm in length 3268400100037 and diameter, and has a wall thickness of 0.2mm. The 3268400100038 cell was sealed by a Mo foil of 15 mg/cm2 and by two 3268400100039 O-rings, one made of indium and the other of rubber. 3268400100040 Golden backing was used as a beam stop and as a 3268400100041 liner. The gas pressure is 2.2 atm. 3268400100042 2)Helium gas cell: It is located upstream in the beam 3268400100043 line in relation to the tritium cell. 2.3 x 1.2 cm in 3268400100044 length and diameter, the thickness of entrance Mo foil 3268400100045 is 10 mg/cm2. The gas pressure is 0.2 atm. 3268400100046 INC-SPECT 1)The time resolution of the TOF spectrometer, which 3268400100047 was estimated to be no greater than 2.5 ns; 3268400100048 2)The diameter of the 209Bi sample (2.5 cm) causes a 3268400100049 time spread of about 0.3 ns; 3268400100050 3)The thickness of the detectors (5.0 cm) contributes 3268400100051 about 0.6 ns to the time spread; 3268400100052 SAMPLE Metallic Bi was placed 20 cm away from the center of 3268400100053 the tritium gas target: 3268400100054 1)lab angles theta greater than 26 degree: 25 x 35 mm 3268400100055 cylinder; 3268400100056 2)lab angles theta less than 26 degree: 15 x 35 mm 3268400100057 cylinder; 3268400100058 ERR-ANALYS (ERR-T) The total uncertainty; 3268400100059 (ERR-1,4.,20.) The statistical uncertainties were 3268400100060 4%-9% and 10%-20% for the angle range 11 to 70 deg. 3268400100061 and 75 to 160 deg., respectively; 3268400100062 (ERR-2,,1.) The statistical uncertainty was less than 3268400100063 1% at 0 deg. measurement; 3268400100064 (ERR-3,,2.) The uncertainty of the dead-time 3268400100065 correction; 3268400100066 .The uncertainty of scattering angle is less 3268400100067 than 0.2 deg. 3268400100068 STATUS (TABLE) Data were taken from Table 1 in page 4 of 3268400100069 J,PR/C,82,024601,2010. 3268400100070 HISTORY (20110329C) Compiled by Guochang CHEN (CNDC) 3268400100071 (20110816A) On. ERR-ANALYS corrected. 3268400100072 ENDBIB 70 0 3268400100073 COMMON 2 3 3268400100074 EN EN-RSL-FW 3268400100075 MEV MEV 3268400100076 37. 2.7 3268400100077 ENDCOMMON 3 0 3268400100078 ENDSUBENT 77 0 3268400199999 SUBENT 32684002 20110816 31513268400200001 BIB 3 4 3268400200002 REACTION (83-BI-209(N,SCT)83-BI-209,,DA) 3268400200003 COMMENT The measured result is sum of elastic and 3268400200004 inelastic scattering differential cross sections. 3268400200005 HISTORY (20110816U) On. BIB corrected. 3268400200006 ENDBIB 4 0 3268400200007 NOCOMMON 0 0 3268400200008 DATA 3 43 3268400200009 ANG-CM DATA-CM ERR-T 3268400200010 ADEG MB/SR MB/SR 3268400200011 10.9 4890. 230. 3268400200012 13.7 2079. 90. 3268400200013 16.5 429. 23. 3268400200014 19.9 100. 10. 3268400200015 23.4 263. 16. 3268400200016 26.1 231. 17. 3268400200017 28.4 107. 11. 3268400200018 31.4 69.2 6.3 3268400200019 35.5 94.3 7.8 3268400200020 38.6 153.3 8.6 3268400200021 39.4 148.0 8.2 3268400200022 42.0 185.4 5.6 3268400200023 44.6 141.3 5.8 3268400200024 47.3 82.2 5.8 3268400200025 48.4 60.6 4.6 3268400200026 52.0 46.4 3.1 3268400200027 55.3 68.4 3.1 3268400200028 58.1 66.8 4.2 3268400200029 60.7 59.9 3.3 3268400200030 64.5 34.9 2.4 3268400200031 67.8 25.0 1.8 3268400200032 71.1 31.3 3.0 3268400200033 75.0 27.8 3.0 3268400200034 77.7 22.7 2.4 3268400200035 80.6 18.6 1.3 3268400200036 84.9 12.8 1.0 3268400200037 90.8 10.5 1.2 3268400200038 91.7 10.9 1.2 3268400200039 94.5 8.65 0.92 3268400200040 102.2 4.81 0.74 3268400200041 105.0 5.00 0.73 3268400200042 109.7 4.56 0.65 3268400200043 111.7 3.64 0.47 3268400200044 114.9 3.31 0.41 3268400200045 119.8 3.34 0.53 3268400200046 124.5 1.79 0.31 3268400200047 130.1 1.87 0.32 3268400200048 135.0 1.74 0.37 3268400200049 139.6 2.05 0.33 3268400200050 144.9 1.30 0.22 3268400200051 149.9 1.54 0.23 3268400200052 154.6 1.59 0.19 3268400200053 159.7 1.09 0.17 3268400200054 ENDDATA 45 0 3268400200055 ENDSUBENT 54 0 3268400299999 ENDENTRY 2 0 3268499999999