ENTRY 22847 20110207 22262284700000001 SUBENT 22847001 20110207 22262284700100001 BIB 18 127 2284700100002 TITLE Elastic neutron scattering at 96 MeV from C-12 and 2284700100003 Pb-208. 2284700100004 AUTHOR (J.Klug, J.Blomgren, A.Atac, B.Bergenwall, 2284700100005 A.Hildebrand, C.Johansson, P.Mermod, L.Nilsson, 2284700100006 S.Pomp, U.Tippawan, K.Elmgren, N.Olsson, O.Jonsson, 2284700100007 A.V.Prokofiev, P.-U.Renberg, P.Nadel-Turonski, 2284700100008 S.Dangtip, P.Phansuke, M.Osterlund, C.Le Brun, 2284700100009 J.F.Lecolley, F.R.Lecolley, M.Louvel, N.Marie-Noury, 2284700100010 C.Schweitzer, Ph.Eudes, F.Haddad, C.Lebrun, 2284700100011 A.J.Koning, X.Ledoux, E.Bauge, J.P.Delaroche, M.Girod, 2284700100012 P.Romain, D.G.Madland, K.Amos, P.K.Deb, 2284700100013 S.Karataglidis, R.Crespo, A.M.Moro) 2284700100014 INSTITUTE (2SWDUPP) Klug, Blomgren,Atac, Bergenwall, Hildebrand,2284700100015 Johansson, Mermod, Nilsson, Pomp, Tippawan, 2284700100016 Dept of Neutron Research,Uppsala University;2284700100017 Jonsson, Prokofiev, Renberg, Swedberg Lab., 2284700100018 Nadel-Turonski, Dept of Radiation Sciences 2284700100019 (2SWDFOI) Elmgren, Olsson -Swedish Defence Res.Agency.2284700100020 (2SWDSWD) Osterlund -Dept of Physics, University of 2284700100021 Joenkoeping, Sweden. 2284700100022 (2FR CAE) Le Brun, J.Lecolley, F.Lecolley, Louvel, 2284700100023 Marie-Noury, Schweitzer. 2284700100024 (2FR NTE) Eudes, Haddad, Lebrun 2284700100025 (2NEDNRG) Koning 2284700100026 (2FR BRC) Bauge, Delaroche, Girod, Ledoux, Romain 2284700100027 (2PRTPRT) Crespo, Moro, Instituto Superior Technico, 2284700100028 Lisboa, Portugal 2284700100029 (1USALAN) Madland, Theoretical Division of LAN 2284700100030 (3AULAML) Amos, Deb, Karataglidis 2284700100031 (3TAICHM) Dangtip, Phansuke 2284700100032 REFERENCE (J,PR/C,68,064605,2003) Main reference, detailed paper 2284700100033 #doi:10.1103/PhysRevC.68.064605 2284700100034 (J,PR/C,67,031601,2003) Rapid communication 2284700100035 #doi:10.1103/PhysRevC.67.031601 2284700100036 (T,Oehrn,2008) Exp. details, data analysis. 2284700100037 (C,2007NICE,2,1023,200704) 2284700100038 #doi:10.1051/ndata:07372 2284700100039 Data were confirmed and compared with phenomenological2284700100040 and microscopic optical model predictions together 2284700100041 with other experimental data. 2284700100042 REL-REF (M,,J.Klug+,J,NIM/A,489,282,2002) Details of neutron 2284700100043 beam facility and SCANDAL setup at Swedberg Lab., 2284700100044 Uppsala, Sweden. 2284700100045 (R,21123001,G.L.Salmon,J,NP,21,15,1960) Data of 2284700100046 G.Salmon at 3.01, 5.02, 7.54 deg in c.m.system 2284700100047 (converted to lab.system and slightly modified) were 2284700100048 added to Pb-208 distribution before Monte Carlo 2284700100049 simulations. 2284700100050 (R,13569003,R.W.Finlay+,J,PR/C,47,237,1993) Data of 2284700100051 total c-s, used in normalization for C-12. 2284700100052 (R,11174001,J.DeJuren+,J,PR,77,606,1950) 2284700100053 (R,21370001,R.G.P.Voss+,J,PRS/A,236,41,1956) 2284700100054 Data of reaction c-s used in normalization for C-12. 2284700100055 FACILITY (CYCLO,2SWDUPP) 2284700100056 INC-SOURCE (P-LI7) A 427 mg/cm2 disk of Li-7 isotopically 2284700100057 enriched to 99.98%. 2284700100058 System of three collimators defined a 9cm diameter 2284700100059 neutron beam at scattering target, neutron yield was 2284700100060 6.E+5 1/sec over whole beam area. 2284700100061 INC-SPECT Neutron energy was determined by measuring the energy 2284700100062 of proton recoil with the help of plastic scintillator2284700100063 Low-energy tail of source neutron spectrum 2284700100064 was suppressed by time-of-flight techniques. 2284700100065 Charge particles in neutron beam < 1%. 2284700100066 DETECTOR (CSICR) Scattered neutrons were detected by SCANDAL 2284700100067 set-up: 2284700100068 - proton detection with 35 MeV energy threshold in 2284700100069 the angular range 10-140 degrees, 2284700100070 - proton energy measured using 24 CsI(Na) detectors, 2284700100071 (DRFTC)-proton trajectory was defined by drift chambers2284700100072 - energy resolution ~3.7 MeV 2284700100073 - angular resolution ~1 deg 2284700100074 (FISCH) Fission chamber as neutron scatterer 2284700100075 (SCIN) Pulse heights were registered by plastic 2284700100076 scintillator and CsI detectors. 2284700100077 (TFBC) For absolute monitoring of neutron fluence a 2284700100078 fission detector based on thin-film breakdown counters2284700100079 Veto detectors to remove scattered charge particles. 2284700100080 METHOD (EDE) Particle identification using E-DE technique. 2284700100081 (PHD) 2284700100082 (STTA) Count rate increased using a sandwiched 2284700100083 multi-target system. 2284700100084 (TOF) Events associated with 96 MeV neutrons from the 2284700100085 beam are selected using a time-of-flight technique. 2284700100086 SAMPLE C-H2 sample serves for calibration purposes. 2284700100087 CH2- vs- C difference measurement for H(n,n) c-s. 2284700100088 MONITOR (1-H-1(N,EL)1-H-1,,DA) 2284700100089 MONIT-REF (22668002,J.RAHM+,J,PR/C,63,044001,2001) - Absolute 2284700100090 cross- sections are obtained by normalization to the 2284700100091 H(N,P) elastic scattering differential cross-section 2284700100092 at 96 MeV -second independent normalization of 2284700100093 angular distributions for Pb-208 and C-12. 2284700100094 ANALYSIS (SHAPE) Spectra of : 1)elastic scattering from Pb-208 2284700100095 including background, 2)elastic scattering from C-12 2284700100096 including background, 3) pure background, 2284700100097 were analyzed. 2284700100098 Two methods of normalization were used 2284700100099 - by np scattering cross section, 2284700100100 - by SIGtot-SIGreac method. 2284700100101 CORRECTION Correction for dead time before background 2284700100102 subtraction. 2284700100103 Correction for neutron attenuation and multiple 2284700100104 scattering in the target, using MONTE CARLO program. 2284700100105 Correction for contribution from Pb-206 isotope in 2284700100106 lead data < 1%. 2284700100107 Correction for contribution from low-energy continuum 2284700100108 of Li-7(n,p) spectrum to np scattering peak - <6%. 2284700100109 ADD-RES (E-DIS) Excitation energy spectra as histograms - 2284700100110 Fig.3 and 4 of main reference . 2284700100111 (THEO) Optical model parameters from potential of 2284700100112 Koning and Delaroche - Table III of main reference. 2284700100113 ERR-ANALYS (ERR-T) Total=statistical+ 2284700100114 multiple scattering corrections error 2284700100115 (ERR-S) Relative statistical errors(before corrections)2284700100116 (ERR-1) Error due to angle uncertainty 2284700100117 (ERR-2) Uncertainty of normalization by SIGtot-SIGreac 2284700100118 method. 2284700100119 (ERR-3) Uncertainty of normalization by np scattering. 2284700100120 HISTORY (20050302C) Compiled SM/MN 2284700100121 (20071214A) M.M. BIB and COMMON information was added. 2284700100122 SUBENT .004 was added. 2284700100123 (20080609U) M.M. REL-REF was corrected. 2284700100124 3-rd reference was added. 2284700100125 (20090224U) M.M. REL-REF C,2007NICE,2,1023,2007 was 2284700100126 moved in REFERENCE lines according to NDS request. 2284700100127 (20110207U) SD: DOI identifier was corrected. 2284700100128 Additional DOI added to refs. 2284700100129 ENDBIB 127 0 2284700100130 COMMON 6 3 2284700100131 EN EN-ERR EN-RSL-FW ERR-2 ERR-3 ANG-RSL 2284700100132 MEV MEV MEV PER-CENT PER-CENT ADEG 2284700100133 96. 0.5 1.2 3. 1. 1. 2284700100134 ENDCOMMON 3 0 2284700100135 ENDSUBENT 134 0 2284700199999 SUBENT 22847002 20071214 21912284700200001 BIB 5 13 2284700200002 REACTION (6-C-12(N,EL)6-C-12,,DA) 2284700200003 SAMPLE Carbon cylinder 98.9% C-12, 5cm high, 5cm in diameter 2284700200004 mass 178 gram 2284700200005 ANALYSIS Absolute normalization by total elastic c-s, which was2284700200006 determined from difference between total c-s 2284700200007 512.+-3.mb (weighted average of two points at 95.2 , 2284700200008 96.2 MeV, see REL-REF Finlay+) and reaction c-s 2284700200009 226.+-5.mb (obtained from weighted average of five 2284700200010 measurements at 95.MeV, REL-REF DeJuren+, and from two2284700200011 measurements at 81. and 105.MeV, REL-REF Voss+) . 2284700200012 ASSUMED (ASSUM1,6-C-12(N,EL)6-C-12,,SIG)Elastic c-s value used 2284700200013 in normalization. 2284700200014 STATUS (TABLE) Data from Table II of main reference. 2284700200015 ENDBIB 13 0 2284700200016 COMMON 2 3 2284700200017 ASSUM1 ASSUM1-ERR 2284700200018 MB MB 2284700200019 286. 7. 2284700200020 ENDCOMMON 3 0 2284700200021 DATA 5 22 2284700200022 ANG-CM DATA-CM ERR-T ERR-S ERR-1 2284700200023 ADEG MB/SR MB/SR PER-CENT MB/SR 2284700200024 11.2 743. 10. 1.3 81. 2284700200025 14.9 522. 8. 1.5 75. 2284700200026 19.0 240. 5. 2.1 41. 2284700200027 23.4 122. 4. 2.8 23. 2284700200028 27.7 54.4 2.9 4.7 10.3 2284700200029 31.7 23.9 1.9 6.5 3.8 2284700200030 32.3 15.7 1.5 7.6 2.4 2284700200031 35.9 11.3 1.3 9.3 1.4 2284700200032 36.9 9.7 1.2 10. 1.2 2284700200033 40.3 6.0 1.0 13. 0.7 2284700200034 41.5 5.2 0.9 15. 0.6 2284700200035 44.9 3.8 0.9 18. 0.5 2284700200036 46.3 2.9 0.8 19. 0.4 2284700200037 49.5 1.8 0.6 23. 0.3 2284700200038 50.5 0.3 0.3 56. 0.1 2284700200039 53.8 0.9 0.5 41. 0.1 2284700200040 54.5 0.6 0.4 41. 0.1 2284700200041 58.3 0.8 0.4 36. 0.1 2284700200042 58.6 0.8 0.3 33. 0.1 2284700200043 63.2 0.3 0.2 58. 2284700200044 67.6 0.1 0.2 131. 2284700200045 71.3 0.4 0.2 49. 2284700200046 ENDDATA 24 0 2284700200047 ENDSUBENT 46 0 2284700299999 SUBENT 22847003 20080609 22002284700300001 BIB 5 20 2284700300002 REACTION (82-PB-208(N,EL)82-PB-208,,DA) 2284700300003 SAMPLE Lead cylinder 88% Pb-208, 11% Pb-206, 1% Pb-207, 2284700300004 6.3 cm high, 2.9 cm in diameter, mass 444 gram. 2284700300005 ANALYSIS Normalization: 2284700300006 1. Relative to C-12(n,el) data of this experiment, 2284700300007 knowing relative neutron fluences, target masses,etc, 2284700300008 giving exp.total elastic c-s 2764.+-51.mb for Pb-208 2284700300009 (see SUBENT .004). 2284700300010 2. Using difference between total c-s 4654.+-47.mb 2284700300011 (weighted average of ten points around 96.MeV) 2284700300012 and reaction c-s (obtained from weighted average of 2284700300013 two measurements at 95.MeV, REL-REF DeJuren+, and from2284700300014 two measurements at 81. and 105.MeV, REL-REF Voss+), 2284700300015 resulting in elastic c-s 2847.+-84.mb. 2284700300016 STATUS (DEP,22847002) 2284700300017 (DEP,22847004) 2284700300018 (TABLE) Data from Table II of main reference. 2284700300019 (SPSDD,22987004) Data superseded by data of 2284700300020 Subent 22987004 - reanalyzed data. 2284700300021 HISTORY (20080609A) Data were superseded. 2284700300022 ENDBIB 20 0 2284700300023 NOCOMMON 0 0 2284700300024 DATA 5 23 2284700300025 ANG-CM DATA-CM ERR-T ERR-S ERR-1 2284700300026 ADEG MB/SR MB/SR PER-CENT MB/SR 2284700300027 10.4 3764. 46. 0.8 1835. 2284700300028 13.9 1281. 26. 1.5 228. 2284700300029 17.7 989. 18. 1.6 100. 2284700300030 21.7 402. 12. 2.4 145. 2284700300031 25.7 187.1 9.7 3.5 15.3 2284700300032 29.5 165.3 7.5 3.6 22.7 2284700300033 30.0 145.0 6.4 3.5 25.2 2284700300034 33.4 74.0 5.4 5.3 21.3 2284700300035 34.4 44.7 4.6 5.9 9.3 2284700300036 37.6 36.1 3.6 6.8 2.0 2284700300037 38.7 38.1 3.2 7.4 0.4 2284700300038 41.9 28.6 2.6 9.3 6.1 2284700300039 43.2 21.9 2.5 8.9 5.5 2284700300040 46.3 9.6 1.6 12. 0.4 2284700300041 47.2 13.2 1.7 12. 0.1 2284700300042 50.3 7.9 1.3 15. 0.7 2284700300043 51.0 9.9 1.7 13. 1.1 2284700300044 54.6 4.3 1.1 22. 1.1 2284700300045 54.9 5.2 0.9 15. 1.2 2284700300046 59.3 2.9 0.8 26. 0.1 2284700300047 63.6 1.4 0.6 43. 0.4 2284700300048 67.2 0.5 0.6 66. 0.1 2284700300049 71.2 1.2 0.6 52. 0.1 2284700300050 ENDDATA 25 0 2284700300051 ENDSUBENT 50 0 2284700399999 SUBENT 22847004 20071214 21912284700400001 BIB 4 6 2284700400002 REACTION (82-PB-208(N,EL)82-PB-208,,SIG) 2284700400003 Experimental total elastic cross section. 2284700400004 SAMPLE Lead cylinder 88% Pb-208, 11% Pb-206, 1% Pb-207, 2284700400005 6.3 cm high, 2.9 cm in diameter, mass 444 gram. 2284700400006 ERR-ANALYS (DATA-ERR) Error is not specified, probably total. 2284700400007 STATUS Text of main reference, p.9. 2284700400008 ENDBIB 6 0 2284700400009 NOCOMMON 0 0 2284700400010 DATA 2 1 2284700400011 DATA DATA-ERR 2284700400012 MB MB 2284700400013 2764. 51. 2284700400014 ENDDATA 3 0 2284700400015 ENDSUBENT 14 0 2284700499999 ENDENTRY 4 0 2284799999999