ENTRY 23284 20151215 22482328400000001 SUBENT 23284001 20151215 22482328400100001 BIB 16 65 2328400100002 TITLE Quasi-stellar neutrons from the 7Li( p,n)7Be reaction 2328400100003 with an energy-broadened proton beam. 2328400100004 AUTHOR (G.Feinberg, M.Friedman, A.Krasa, A.Shor, Y.Eisen, 2328400100005 D.Berkovits, D.Cohen, G.Giorginis, T.Hirsh, M.Paul, 2328400100006 A.J.M.Plompen, E.Tsuk) 2328400100007 INSTITUTE (2ZZZGEL) A.Krasa, G.Giorginis, A.J.M.Plompen 2328400100008 (3ISLSOR) G.Feinberg,A.Shor,Y.Eisen,D.Berkovits,T.Hirsh2328400100009 (3ISLHEB) G.Feinberg,M.Friedman,D.Cohen,M.Paul,E.Tsuk 2328400100010 REFERENCE (J,PR/C,85,055810,2012) 2328400100011 #doi:10.1103/PhysRevC.85.055810 2328400100012 REL-REF (O,O1983001,G.Feinberg+,J,PR/C,85,055810,2012) 2328400100013 Proton-induced data of neutron spectra. 2328400100014 FACILITY (VDGT,2ZZZGEL) 7-MV Van de Graaff accelerator at IRMM. 2328400100015 Operated in pulsed mode with frequency 625 kHz. 2328400100016 INC-SOURCE (P-LI7) 7Li(p,n) reaction on LiF target of 6mm diameter2328400100017 prepared by evaporation on a 1-mm thick Cu disk of 2328400100018 40.7 mm diameter. Bunched and chopped proton beam, 2328400100019 proton energy 1912 keV. 2328400100020 The LiF layer thickness was determined by weighing to 2328400100021 be 1-2 mg/cm**2. 2328400100022 Proton beam pulse width 1.5-2 ns(FWHM) . 2328400100023 DETECTOR (GLASD) Two 6Li-glass detectors - for incident neutron 2328400100024 detection. 2328400100025 (LONGC) Long counter (54cm x 35.6cm diameter) for 2328400100026 neutron monitoring. 2328400100027 (NAICR) NaI detector (4in x 4in diameter) for gamma 2328400100028 monitoring. 2328400100029 (HPGE) HPGe detector of 100% relative efficiency to 2328400100030 measure induced Be-7 and Au-198 activity. 2328400100031 Efficiency was measured by standard point sources, 2328400100032 estimated uncertainty of absolute efficiencies ~2% . 2328400100033 METHOD (TOF) For incident neutron energy measurement. 2328400100034 (ACTIV) Gold activation measurement for both beams. 2328400100035 MONITOR (3-LI-7(P,N)4-BE-7,,SIG) 2328400100036 Be-7 induced activity was measured. 2328400100037 DECAY-MON (4-BE-7,53.229D,DG,477.6,0.1044) 2328400100038 53.22+-0.06 d, 10.44+-0.04 % 2328400100039 DECAY-DATA (79-AU-198-G,2.6948D,DG,411.8,0.9556) 2328400100040 COMMENT Authors use the term "broad-energy proton beam" for 2328400100041 protons that impinge on the LiF target after a gold 2328400100042 degrader foil in case of an incident energy of 2328400100043 2096.5 keV before the degrader and use the term 2328400100044 "narrow-energy proton beam" for a proton beam of 2328400100045 1912 keV directly from the Van de Graaff accelerator. 2328400100046 CORRECTION For the solid angle subtended by the Au sample. 2328400100047 For the neutron scattering in the Cu target backing. 2328400100048 For the planar geometry of the Au sample. 2328400100049 The photon attenuation correction due to 2328400100050 self-absorption in the target. 2328400100051 Correction factors: 2328400100052 for attenuation for geometry 2328400100053 narrow energy Be7 100. 100. 2328400100054 narrow energy, Au #1 99.1 98.0 2328400100055 narrow energy, Au #2 97.5 2328400100056 broad energy Be7 100. 100. 2328400100057 broad energy, Au #1 98.0 2328400100058 broad energy, Au #2 97.5 2328400100059 for activities on planer Au sample 2328400100060 narrow energy broad energy 2328400100061 Au #1 (angle < 84 deg) 1.25+-0.03 1.41+-0.04 2328400100062 Au #2 (angle < 66 deg) 1.16+-0.03 1.10+-0.03 2328400100063 ANALYSIS kT=28 keV was determined by best fit of measured 2328400100064 neutron spectra at 8 keV < En < 80 keV for broad and 2328400100065 narrow proton energy spectra. 2328400100066 HISTORY (20151215C) M.M. 2328400100067 ENDBIB 65 0 2328400100068 COMMON 3 3 2328400100069 ERR-HL ERR-IDD KT 2328400100070 D NO-DIM KEV 2328400100071 0.0012 0.0004 28. 2328400100072 ENDCOMMON 3 0 2328400100073 ENDSUBENT 72 0 2328400199999 SUBENT 23284002 20151215 22482328400200001 BIB 6 28 2328400200002 REACTION (79-AU-197(N,G)79-AU-198,,SIG,,MXW) MACS 2328400200003 INC-SOURCE Standard deviation for proton energy distribution 2328400200004 ~1.5 keV for narrow-energy beam . 2328400200005 SAMPLE Au flat samples: 2328400200006 #1 : LiF target-Au sample distance 1.0 mm, 2328400200007 diameter 18.05mm, 2328400200008 detector angle 84 deg, 2328400200009 weight 229.3mg, 2328400200010 atomic thickness (2.74+-0.01)*10**20 1/cm2 . 2328400200011 #2 : LiF target-Au sample distance 5.0 mm, 2328400200012 diameter 22.07 mm, 2328400200013 detector angle 66 deg, 2328400200014 weight 327.7 mg, 2328400200015 atomic thickness (2.62+-0.01)*10**20 1/cm2 . 2328400200016 ERR-ANALYS (ERR-T) Total uncertainty 2.7% (#1) - 2.9 % (#2). 2328400200017 Considered uncertainties: 2328400200018 (ERR-S) Counting statistics for Au198 activity 2328400200019 (ERR-1) Be7 activity - 0.9% 2328400200020 (ERR-2) Energy dependence of photopeak efficiency -0.5%2328400200021 (ERR-3) Sample thickness - 0.2% . 2328400200022 (ERR-4) Correction factors for activities of planar 2328400200023 gold sample - 2.5% . 2328400200024 FLAG (1.) Sample Au #1 (angle < 84 deg) 2328400200025 (2.) Sample Au #2 (angle < 66 deg) 2328400200026 STATUS (TABLE) Tables VII ( data) , VIII(uncertainties) of 2328400200027 PR/C,85,055810,2012 2328400200028 (DEP,O1983005) Neutron spectrum. 2328400200029 (COREL,23284003) Measurement at broad-energy beam 2328400200030 ENDBIB 28 0 2328400200031 COMMON 4 3 2328400200032 ERR-1 ERR-2 ERR-3 ERR-4 2328400200033 PER-CENT PER-CENT PER-CENT PER-CENT 2328400200034 0.9 0.5 0.2 2.5 2328400200035 ENDCOMMON 3 0 2328400200036 DATA 4 2 2328400200037 DATA ERR-T ERR-S FLAG 2328400200038 MB MB PER-CENT NO-DIM 2328400200039 608. 17. 0.4 1. 2328400200040 626. 18. 0.9 2. 2328400200041 ENDDATA 4 0 2328400200042 ENDSUBENT 41 0 2328400299999 SUBENT 23284003 20151215 22482328400300001 BIB 6 29 2328400300002 REACTION (79-AU-197(N,G)79-AU-198,,SIG,,MXW) MACS 2328400300003 INC-SOURCE Standard deviation for proton energy distribution 2328400300004 ~20 keV for broad-energy beam, obtained by gold 2328400300005 degrader of 2 microm thickness. 2328400300006 SAMPLE Au flat samples: 2328400300007 #1 : LiF target-Au sample distance 1.0mm, 2328400300008 diameter 18.06mm, 2328400300009 detector angle 84 deg, 2328400300010 weight 229.5mg, 2328400300011 atomic thickness (2.74+-0.01)*10**20 1/cm2 . 2328400300012 #2 : LiF target-Au sample distance 5.0 mm, 2328400300013 diameter 22.06 mm, 2328400300014 detector angle 66 deg, 2328400300015 weight 330.0 mg, 2328400300016 atomic thickness (2.64+-0.01)*10**20 1/cm2 . 2328400300017 ERR-ANALYS (ERR-T) Total uncertainty 2.6% (#1) - 2.7 % (#2). 2328400300018 Considered uncertainties: 2328400300019 (ERR-S) Counting statistics for Au198 activity 2328400300020 (ERR-1) Be7 activity - 0.7% 2328400300021 (ERR-2) Energy dependence of photopeak efficiency -0.5%2328400300022 (ERR-3) Sample thickness - 0.2% . 2328400300023 (ERR-4) Correction factors for activities of planar 2328400300024 gold sample - 2.5% . 2328400300025 FLAG (1.) Sample Au #1 (angle < 84 deg) 2328400300026 (2.) Sample Au #2 (angle < 66 deg) 2328400300027 STATUS (TABLE) Tables VII ( data) , VIII(uncertainties) of 2328400300028 PR/C,85,055810,2012 2328400300029 (DEP,O1983003) Neutron spectrum. 2328400300030 (COREL,23284002) Measurement at narrow-energy beam 2328400300031 ENDBIB 29 0 2328400300032 COMMON 4 3 2328400300033 ERR-1 ERR-2 ERR-3 ERR-4 2328400300034 PER-CENT PER-CENT PER-CENT PER-CENT 2328400300035 0.7 0.5 0.2 2.5 2328400300036 ENDCOMMON 3 0 2328400300037 DATA 4 2 2328400300038 DATA ERR-T ERR-S FLAG 2328400300039 MB MB PER-CENT NO-DIM 2328400300040 620. 17. 0.5 1. 2328400300041 619. 17. 0.7 2. 2328400300042 ENDDATA 4 0 2328400300043 ENDSUBENT 42 0 2328400399999 SUBENT 23284004 20151215 22482328400400001 BIB 5 8 2328400400002 REACTION (79-AU-197(N,G)79-AU-198,,SIG,,MXW) MACS 2328400400003 ANALYSIS Average for two samples. 2328400400004 INC-SOURCE Standard deviation for proton energy distribution 2328400400005 ~1.5keV for narrow-energy beam . 2328400400006 ERR-ANALYS (DATA-ERR) Total uncertainty . 2328400400007 STATUS (TABLE) Tables VII, IX of PR/C,85,055810,2012 2328400400008 (DEP,23248002) Data for two samples. 2328400400009 (COREL,23284005) Measurement at broad-energy beam 2328400400010 ENDBIB 8 0 2328400400011 NOCOMMON 0 0 2328400400012 DATA 2 1 2328400400013 DATA DATA-ERR 2328400400014 MB MB 2328400400015 616. 17. 2328400400016 ENDDATA 3 0 2328400400017 ENDSUBENT 16 0 2328400499999 SUBENT 23284005 20151215 22482328400500001 BIB 4 8 2328400500002 REACTION (79-AU-197(N,G)79-AU-198,,SIG,,MXW) MACS 2328400500003 INC-SOURCE Standard deviation for proton energy distribution 2328400500004 ~20 keV for broad-energy beam, obtained by gold 2328400500005 degrader of 2 microm thickness. 2328400500006 ERR-ANALYS (DATA-ERR) Total uncertainty 2328400500007 STATUS (TABLE) Tables VII, IX of PR/C,85,055810,2012 2328400500008 (DEP,23248003) Data for two samples. 2328400500009 (COREL,23284004) Measurement at narrow-energy beam 2328400500010 ENDBIB 8 0 2328400500011 NOCOMMON 0 0 2328400500012 DATA 2 1 2328400500013 DATA DATA-ERR 2328400500014 MB MB 2328400500015 620. 16. 2328400500016 ENDDATA 3 0 2328400500017 ENDSUBENT 16 0 2328400599999 ENDENTRY 5 0 2328499999999