ENTRY 14633 20200413 14711463300000001 SUBENT 14633001 20200413 14711463300100001 BIB 10 38 1463300100002 TITLE Neutron-neutron quasifree scattering in 1463300100003 neutron-deuteron breakup at 10 MeV 1463300100004 AUTHOR (R.C.Malone,A.S.Crowell,L.C.Cumberbatch,B.A.Fallin, 1463300100005 F.Q.L.Friesen,C.R.Howell,C.R.Malone,D.R.Ticehurst, 1463300100006 W.Tornow,D.M.Markoff,B.J.Crowe,H.Witala) 1463300100007 INSTITUTE (1USATNL,1USADKE,1USANCC,3POLUJK) 1463300100008 REFERENCE (J,PR/C,101,034002,2020) 1463300100009 FACILITY (VDGT,1USATNL) Experiment performed using the 10 MV 1463300100010 FN tandem Van de Graaff accelerator at the Triangle 1463300100011 Universities Nuclear Laboratory 1463300100012 SAMPLE (1-H-2,ENR=0.984) Deuterated polyethylene sample CD2 1463300100013 with diameter of 28.3 mm, height of 36.4 and weight 1463300100014 25.172 g was used for n-d measurements. 1463300100015 Standard polyethylene sample CH2 with diameter of 14.2 1463300100016 mm, height of 22.7 and weight 3.389 g was used for 1463300100017 n-p measurements. 1463300100018 Two graphite samples with masses of 2.9424 and 42.055 g1463300100019 were used for background measurements from n-C 1463300100020 scattering in polyethylene samples. 1463300100021 DETECTOR (SCIN) Scattered neutrons were detected using two 1463300100022 5.08 cm long liquid scintillation detectors with 1463300100023 diameters of 12.7 and 8.89 cm filled with NE- 213 and 1463300100024 NE-218 liquid scintillators. Detectors were placed at 1463300100025 equal angles of +-36.7deg with respect to beam axis 1463300100026 in a distance of 264.9cm (left detector) and 264.3 cm 1463300100027 (right detector) from the sample. Both detectors 1463300100028 were placed in a shielding of Li-doped paraffin with 1463300100029 conical Cu collimator. 1463300100030 METHOD (TOF) Energies of scattered neutrons were determined 1463300100031 using time of flight. The incident neutron beam was 1463300100032 pulsed at a repetition rate of 2.5 MHz and pulse 1463300100033 width was 2 ns. 1463300100034 INC-SOURCE (D-D) Neutrons were produced via the 2H(d,n)3He 1463300100035 reaction with a pulsed deuteron beam incident on a 1463300100036 3.16 cm long gas cell filled with deuterium at the 1463300100037 pressure of 5 atm. Beam period was 400 ns and pulse 1463300100038 width 2 ns. 1463300100039 HISTORY (20200413C) Compiled by S.H. 1463300100040 ENDBIB 38 0 1463300100041 COMMON 1 3 1463300100042 EN 1463300100043 MEV 1463300100044 10. 1463300100045 ENDCOMMON 3 0 1463300100046 ENDSUBENT 45 0 1463300199999 SUBENT 14633002 20200413 14711463300200001 BIB 3 14 1463300200002 REACTION (1-H-2(N,EL)1-H-2,,DA) 1463300200003 ERR-ANALYS (ERR-1) Syst. uncert. in yields in nd elastic peak 1463300200004 (ERR-2) Syst. uncert. in yields in np peak 1463300200005 (ERR-3) Syst. uncert. in finite geometry correction 1463300200006 (ERR-4) Syst. uncert. in relative detector efficiency 1463300200007 (ERR-5) Syst. uncert. due to detector gain drift 1463300200008 (ERR-6) Syst. uncert. in no. of deuterium nuclei 1463300200009 (ERR-7) Syst. uncert. in no. of hydrogen nuclei 1463300200010 (ERR-8) Syst. uncert. in neutron transmission 1463300200011 (ERR-9) Syst. uncert. in np scattering cross section 1463300200012 (ERR-10) Syst. uncert.in live time correction 1463300200013 (ERR-T) Total systematic uncertainty 1463300200014 (ERR-S) Statistical uncertainty 1463300200015 STATUS (TABLE) Data taken from text p.8 of the reference 1463300200016 ENDBIB 14 0 1463300200017 COMMON 10 6 1463300200018 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 1463300200019 ERR-7 ERR-8 ERR-9 ERR-10 1463300200020 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 1463300200021 PER-CENT PER-CENT PER-CENT PER-CENT 1463300200022 3.2 1.4 2.2 2.1 1.4 1.0 1463300200023 0.4 0.8 0.4 0.6 1463300200024 ENDCOMMON 6 0 1463300200025 DATA 4 2 1463300200026 ANG DATA ERR-S ERR-T 1463300200027 ADEG MB/SR MB/SR MB/SR 1463300200028 -36.7 213.7 0.1 10.9 1463300200029 36.7 216.0 0.1 11.0 1463300200030 ENDDATA 4 0 1463300200031 ENDSUBENT 30 0 1463300299999 SUBENT 14633003 20200413 14711463300300001 BIB 4 19 1463300300002 REACTION (1-H-2(N,2N)1-H-1,,DA/DA/DE,N/N/N) 1463300300003 Quasifree neutron scattering cross section from n-d 1463300300004 breakup reaction. 1463300300005 EN-SEC ANG1 = angle of the first neutron 1463300300006 ANG2 = angle of the second neutron 1463300300007 S = distance along S-curve 1463300300008 ERR-ANALYS (ERR-1) Syst. uncertainty in coincidence yields 1463300300009 (ERR-2) Syst. uncert. in absolute detector efficiency 1463300300010 (ERR-3) Syst. uncert. in relative detector efficiency 1463300300011 (ERR-4) Syst. uncertainty due to detector gain drift 1463300300012 (ERR-5) Syst. uncertainty in neutron transmission 1463300300013 (ERR-6) Syst. uncert. in yields in n-d elastic peak 1463300300014 (ERR-7) Syst. uncertainty in nd elastic scattering 1463300300015 cross section 1463300300016 (ERR-8) Syst. uncertainty in detector solid angle 1463300300017 (ERR-9) Total systematic uncertainty 1463300300018 (ERR-S) Statistical uncertainty 1463300300019 STATUS (TABLE) Data presented in fig.12 of the reference 1463300300020 sent by author (R.C.M.) 1463300300021 ENDBIB 19 0 1463300300022 COMMON 11 6 1463300300023 ANG1 ANG2 ERR-1 ERR-2 ERR-3 ERR-4 1463300300024 ERR-5 ERR-6 ERR-7 ERR-8 ERR-9 1463300300025 ADEG ADEG PER-CENT PER-CENT PER-CENT PER-CENT 1463300300026 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 1463300300027 -36.7 36.7 1.0 3.9 2.4 1.1 1463300300028 0.8 2.3 1.5 0.4 5.6 1463300300029 ENDCOMMON 6 0 1463300300030 DATA 3 7 1463300300031 S DATA ERR-S 1463300300032 MEV MB/SR2/MEV MB/SR2/MEV 1463300300033 4.65 2.45 0.20 1463300300034 5.15 2.79 0.19 1463300300035 5.65 2.86 0.18 1463300300036 6.15 3.48 0.19 1463300300037 6.65 3.28 0.19 1463300300038 7.15 2.95 0.19 1463300300039 7.65 2.70 0.21 1463300300040 ENDDATA 9 0 1463300300041 ENDSUBENT 40 0 1463300399999 SUBENT 14633004 20200413 14711463300400001 BIB 4 7 1463300400002 REACTION (1-H-2(N,2N)1-H-1,,DA/DA) 1463300400003 ERR-ANALYS (ERR-S) Statistical uncertainty 1463300400004 (ERR-SYS) Systematic uncertainty for all data 1463300400005 ANALYSIS (INTED) Obtained by integration along kinematic loci 1463300400006 of allowed energies in nd breakup 1463300400007 STATUS (TABLE) Data taken from text p.9 of the reference 1463300400008 (DEP,14633003) 1463300400009 ENDBIB 7 0 1463300400010 COMMON 2 3 1463300400011 ANG1 ANG2 1463300400012 ADEG ADEG 1463300400013 -36.7 36.7 1463300400014 ENDCOMMON 3 0 1463300400015 DATA 3 1 1463300400016 DATA ERR-S ERR-SYS 1463300400017 MB/SR2 MB/SR2 MB/SR2 1463300400018 20.5 0.5 1.1 1463300400019 ENDDATA 3 0 1463300400020 ENDSUBENT 19 0 1463300499999 ENDENTRY 4 0 1463399999999