ENTRY 14337 20120605 13861433700000001 SUBENT 14337001 20120605 13861433700100001 BIB 16 74 1433700100002 TITLE Cross-section measurements of 2H(n,np)n in symmetric 1433700100003 star configurations 1433700100004 AUTHOR (A.H.Couture,T.B.Clegg,S.Tajima,C.R.Howell,B.Fallin, 1433700100005 J.H.Esterline,A.S.Crowell,B.J.Crowe,D.M.Markoff, 1433700100006 L.C.Cumberbatch,R.S.Pedroni,H.Witala) 1433700100007 INSTITUTE (1USANCA,1USATNL,1USADKE,3POLUJK) 1433700100008 (1USAUSA)North Carolina Central University, Durham, 1433700100009 North Carolina 1433700100010 (1USAUSA) North Carolina A&T State University, 1433700100011 Greensboro,North Carolina 1433700100012 REFERENCE (J,PR/C,85,054004,2012) 1433700100013 FACILITY (VDGT,1USATNL)Experiment performed using pulsed 1433700100014 deuteron beam from the FN Tandem Van de Graaff 1433700100015 accelerator at TUNL 1433700100016 SAMPLE Deuterated polyethylene foil with a circular cross 1433700100017 section with diameter of 25.4 mm. Thickness of the foil1433700100018 was 22.4 mg/cm2 at 16 MeV and 29.8 mg/cm2 at 19 MeV. 1433700100019 DETECTOR (TELES,SCIN,SCIN) dE detector consisted of a 4.7- 1433700100020 mg/cm2-thick BC-404 plastic scintillator coupled to a 1433700100021 Hamamatsu 1949-51 photomultiplier tube. The E 1433700100022 detector in each arm consisted of a 10-cm-diameter by 1433700100023 5-mm-thick disk of BC-404 plastic scintillator 1433700100024 coupled to a Hamamatsu H6527 PMT. The front face of 1433700100025 the scintillator was located 61 cm from the dE 1433700100026 detector. Two telescopes were used in the experiment. 1433700100027 (SCIN) Neutron detectors used BC-501A liquid organic 1433700100028 scintillator in aluminum cylinder with diameter of 1433700100029 12.68 cm and length of 5.08 cm. The scintillator was 1433700100030 directly coupled to a 12.7 cm diameter model R1250 1433700100031 Hamamatsu photomultiplier. Polar angles of four 1433700100032 neutron detectors were approximatelly 18 and 51 deg. 1433700100033 and azimuthal angles were 0, 60, 120 and 180 deg. 1433700100034 METHOD (COINC) Coincidence between one neutron and a proton 1433700100035 detector was required 1433700100036 (EDE) E-dE method was used to identify protons 1433700100037 (TOF) Neutron and proton energies were determined by 1433700100038 time of flight. The deuteron beam was chopped and 1433700100039 bunched at a rate of 78.1 kHz into packets with a 1433700100040 width of ns. Time signal was taken from a capacitive 1433700100041 pickoff unit located before the gas cell and served as 1433700100042 a start signal for neutron time of flight measurement. 1433700100043 Proton energy was measured from proton flight time 1433700100044 between dE and E detectors 1433700100045 INC-SOURCE (D-D) neutrons are produced in deuterium gas cell 1433700100046 located inside the shielding wall. The neutron 1433700100047 production gas cell was a copper tube with a 0.5-mm 1433700100048 thick gold beam stop soldered to one end and a 1433700100049 6.35 mu-m thick Havar beam-entrance foil on the other 1433700100050 end. The gas chamber within the cell was 71.4 mm long 1433700100051 and filled to 7.8 atm with 99.99% pure research grade 1433700100052 deuterium gas. The neutron beam was shaped by a 115 cm 1433700100053 long copper collimator with a circular cross section. 1433700100054 MONITOR (1-H-2(N,EL)1-H-2,,DA) 1433700100055 ERR-ANALYS (ERR-T) Total uncertainty 1433700100056 (ERR-1)Syst. uncertainty in normalization 1433700100057 (ERR-2)Syst. uncertainty in background subtraction 1433700100058 (ERR-3)Syst. uncertainty in solid angle 1433700100059 (ERR-4)Syst. uncertainty in detector efficiency 1433700100060 (ERR-5)Syst. uncertainty in neutron attenuation 1433700100061 (ERR-6)Syst. uncertainty in energy binning 1433700100062 CORRECTION Correction for multiple scattering was made 1433700100063 EN-SEC (E,N) 1433700100064 COMMENT ANG1 Polar angle of the neutron detector 1433700100065 ANG2 Polar angle of the proton detector 1433700100066 ANALYSIS For reaction with three emitted particles it is 1433700100067 sufficient to detect two particles (e.g. one neutron 1433700100068 and one proton) at defined positions, the energy and 1433700100069 momentum of the third particle can be calculated from 1433700100070 kinematics. Therefore it is necessary to fix relative 1433700100071 angular position of two detectors using polar angle of 1433700100072 both detectors and their relative azimuthal angle. 1433700100073 The star condition is fulfilled for specific neutron 1433700100074 energy. 1433700100075 HISTORY (20120605C) Compiled by S.H. 1433700100076 ENDBIB 74 0 1433700100077 COMMON 5 3 1433700100078 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 1433700100079 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 1433700100080 2.0 0.3 3.2 1.0 1.0 1433700100081 ENDCOMMON 3 0 1433700100082 ENDSUBENT 81 0 1433700199999 SUBENT 14337002 20120605 13861433700200001 BIB 3 8 1433700200002 REACTION (1-H-2(N,2N)1-H-1,,DA/DA/DE,N/P/N,NCP) 1433700200003 Space star configuration, phi=120 deg 1433700200004 STATUS (TABLE) Data taken from tab. 5 of the reference 1433700200005 Secondary neutron energy fulfilling the star 1433700200006 condition is taken from fig.9 1433700200007 SAMPLE Deuterated polyethylene foil with a circular cross 1433700200008 section with diameter of 25.4 mm. Thickness of the foil1433700200009 was 22.4 mg/cm2. 1433700200010 ENDBIB 8 0 1433700200011 COMMON 4 3 1433700200012 ANG1 ANG2 ANG-AZ ERR-1 1433700200013 ADEG ADEG ADEG PER-CENT 1433700200014 51.6 51.8 120.0 4.0 1433700200015 ENDCOMMON 3 0 1433700200016 DATA 4 1 1433700200017 EN E DATA ERR-T 1433700200018 MEV MEV MB/SR2/MEV MB/SR2/MEV 1433700200019 16.0 4.59 1.29 0.11 1433700200020 ENDDATA 3 0 1433700200021 ENDSUBENT 20 0 1433700299999 SUBENT 14337003 20120605 13861433700300001 BIB 3 8 1433700300002 REACTION (1-H-2(N,2N)1-H-1,,DA/DA/DE,N/P/N,NCP) 1433700300003 Space star configuration, phi=120 deg 1433700300004 STATUS (TABLE) Data taken from tab. 5 of the reference 1433700300005 Secondary neutron energy fulfilling the star 1433700300006 condition is taken from fig.9 1433700300007 SAMPLE Deuterated polyethylene foil with a circular cross 1433700300008 section with diameter of 25.4 mm. Thickness of the foil1433700300009 was 29.8 mg/cm2 . 1433700300010 ENDBIB 8 0 1433700300011 COMMON 4 3 1433700300012 ANG1 ANG2 ANG-AZ ERR-1 1433700300013 ADEG ADEG ADEG PER-CENT 1433700300014 51.6 51.8 120.0 4.7 1433700300015 ENDCOMMON 3 0 1433700300016 DATA 4 1 1433700300017 EN E DATA ERR-T 1433700300018 MEV MEV MB/SR2/MEV MB/SR2/MEV 1433700300019 19.0 5.60 1.09 0.10 1433700300020 ENDDATA 3 0 1433700300021 ENDSUBENT 20 0 1433700399999 SUBENT 14337004 20120605 13861433700400001 BIB 4 11 1433700400002 REACTION (1-H-2(N,2N)1-H-1,,DA/DA/DE,N/P/N) 1433700400003 Coplanar star configuration, phi=180 deg all 1433700400004 particles are emitted in single plane 1433700400005 MISC-COL (MISC) The azimuthal angle phi for neutron 1433700400006 detector, relative to proton detector. 1433700400007 STATUS (TABLE) Data taken from tab. 5 of the reference 1433700400008 Secondary neutron energy fulfilling the star 1433700400009 condition is taken from fig.9 1433700400010 SAMPLE Deuterated polyethylene foil with a circular cross 1433700400011 section with diameter of 25.4 mm. Thickness of the foil1433700400012 was 22.4 mg/cm2. 1433700400013 ENDBIB 11 0 1433700400014 COMMON 4 3 1433700400015 ANG1 ANG2 MISC ERR-1 1433700400016 ADEG ADEG ADEG PER-CENT 1433700400017 -18.0 51.0 180.0 4.0 1433700400018 ENDCOMMON 3 0 1433700400019 DATA 4 1 1433700400020 EN E DATA ERR-T 1433700400021 MEV MEV MB/SR2/MEV MB/SR2/MEV 1433700400022 16.0 8.47 1.61 0.14 1433700400023 ENDDATA 3 0 1433700400024 ENDSUBENT 23 0 1433700499999 SUBENT 14337005 20120605 13861433700500001 BIB 4 11 1433700500002 REACTION (1-H-2(N,2N)1-H-1,,DA/DA/DE,N/P/N) CST Configuration 1433700500003 Coplanar star configuration, phi=180 deg, all 1433700500004 particles are emitted in single plane 1433700500005 MISC-COL (MISC) The azimuthal angle phi for neutron 1433700500006 detector, relative to proton detector. 1433700500007 STATUS (TABLE) Data taken from tab. 5 of the reference 1433700500008 Secondary neutron energy fulfilling the star 1433700500009 condition is taken from fig.9 1433700500010 SAMPLE Deuterated polyethylene foil with a circular cross 1433700500011 section with diameter of 25.4 mm. Thickness of the foil1433700500012 was 29.8 mg/cm2 . 1433700500013 ENDBIB 11 0 1433700500014 COMMON 4 3 1433700500015 ANG1 ANG2 MISC ERR-1 1433700500016 ADEG ADEG ADEG PER-CENT 1433700500017 -18.0 51.0 180.0 4.7 1433700500018 ENDCOMMON 3 0 1433700500019 DATA 4 1 1433700500020 EN E DATA ERR-T 1433700500021 MEV MEV MB/SR2/MEV MB/SR2/MEV 1433700500022 19.0 10.31 1.25 0.13 1433700500023 ENDDATA 3 0 1433700500024 ENDSUBENT 23 0 1433700599999 ENDENTRY 5 0 1433799999999