ENTRY 22463 20000316 00002246300000001 SUBENT 22463001 20000316 00002246300100001 BIB 12 36 2246300100002 TITLE .Determination of the Neutron Scattering Length 2246300100003 Of 208Pb by the Neutron Interferometry Method 2246300100004 AUTHOR (A.IOFFE, P.LUKAS, P.MIKULA, M.VRANA, V.ZABIYAKIN) 2246300100005 INSTITUTE (2GERBER) Ioffe, 1-St Experimental Site 2246300100006 (4RUSLIN) Zabiyakin 2246300100007 (3CZRUJF) Lukas, Mikula, Vrana, 2Nd Experimental Site 2246300100008 REFERENCE (J,ZP/A,348,243,1994) Main Reference 2246300100009 REL-REF (A,,L.KOESTER+,J,ZP/A,338,233,1991) 2246300100010 (D,,YU.ALEXANDROV+,J,ZP/A,334,359,1989) 2246300100011 (N,20748000,L.KOESTER+,J,ZN/A,26,391,1971) Experi- 2246300100012 Mental Details 2246300100013 FACILITY (REAC,2GERBER) Reactor Ber-Ii of the Neutron 2246300100014 Scattering Center, Hahn-Meitner Institute Acting 2246300100015 At 2 Angstrom Neutron Wave Length 2246300100016 (REAC,3CZRUJF) Reactor Lwr-15 of the Nuclear Physics 2246300100017 Institute, Rez Near Prague Acting at 1 Angstrom 2246300100018 Neutron Wave Length 2246300100019 METHOD .Interferometric Method with Rotating Sample 2246300100020 Overlapping Both of the Interferometer'S Coherent 2246300100021 Beams. Strategy of Measurements Consists in the 2246300100022 Recordings of the Interference Patterns For Silicon 2246300100023 And Lead Plates 2246300100024 MONITOR (14-SI-0(N,THS)14-SI-0,COH,AMP) 2246300100025 DETECTOR (BF3) 2246300100026 SAMPLE .Plane-Parallel Lead Disk 20 mm Diameter, 2246300100027 4.887+-.005 mm Thick, Density 11.3885G/Cm3. 2246300100028 Composition of Lead Sample is - 2246300100029 204Pb Content - L.T. 0.02%, 206Pb Content - 0,64%, 2246300100030 207Pb Content - 2.06%, 208Pb Content - 97.3% 2246300100031 .Silicon Plane-Parallel Plate from a Perfect Crystal 2246300100032 Of Silicon. Thicknesses were 9.987+-0.001 mm at 2246300100033 (2GERBER), 5.239+-0.001 at (3CZRUJF). Density of Si 2246300100034 Sample is 4.9943 1/Cm3 2246300100035 STATUS .Data from Text of Main Reference 2246300100036 HISTORY (20000316C) Compiled by S.M. 2246300100037 (20000316U) Last checking has been done. 2246300100038 ENDBIB 36 0 2246300100039 COMMON 2 3 2246300100040 MONIT MONIT-ERR 2246300100041 FERMI FERMI 2246300100042 4.149 0.001 2246300100043 ENDCOMMON 3 0 2246300100044 ENDSUBENT 43 0 2246300199999 SUBENT 22463002 20000316 00002246300200001 BIB 4 7 2246300200002 REACTION (82-PB-0(N,THS)82-PB-0,COH,AMP) 2246300200003 ERR-ANALYS (ERR-T) Total Error 2246300200004 (EN-ERR) Error of Neutron Wave-Length 2246300200005 FLAG (1.) Data Measured at Hahn-Meitner Institute 2246300200006 (2.) Data Measured at Rex Near Prague 2246300200007 COMMENT .ENERGY IN EV CALCULATED BY COMPILER AS 2246300200008 E(EV)= 0.0828/(WAVE-LENGTH-ANGSTROM)**2 2246300200009 ENDBIB 7 0 2246300200010 COMMON 1 3 2246300200011 ERR-S 2246300200012 PER-CENT 2246300200013 0.05 2246300200014 ENDCOMMON 3 0 2246300200015 DATA 5 7 2246300200016 EN EN-ERR DATA ERR-T FLAG 2246300200017 EV EV FERMI FERMI NO-DIM 2246300200018 2.0484E-02 2.0E-06 9.41 0.008 1. 2246300200019 2.0550E-02 8.1E-06 9.474 0.012 1. 2246300200020 2.0558E-02 8.1E-06 9.612 0.012 1. 2246300200021 2.0583E-02 8.2E-06 9.42 0.012 1. 2246300200022 2.0585E-02 8.2E-06 9.506 0.012 1. 2246300200023 2.2000E-02 2.3E-05 9.452 0.015 2. 2246300200024 2.2475E-02 2.3E-05 9.554 0.015 2. 2246300200025 ENDDATA 9 0 2246300200026 ENDSUBENT 25 0 2246300299999 SUBENT 22463003 20000316 00002246300300001 BIB 5 13 2246300300002 REACTION (82-PB-208(N,THS)82-PB-208,COH,AMP,,AV,DERIV) AVERAGED 2246300300003 OVER ENERGY INTERVAL 2246300300004 CORRECTION .CORRECTIONS WERE MADE ON SAMPLE ISOTOPIC ABUNDANCE 2246300300005 ERR-ANALYS (ERR-T) Total Error 2246300300006 (ERR-1) Error Due to Silicon Scattering Length 2246300300007 Uncertainty 2246300300008 (ERR-2) Error Due to Silicon Plate Thickness Uncert. 2246300300009 (ERR-3) Error Due to Lead Plate Thickness Uncertainty 2246300300010 (ERR-4) Error Due to of Lead Plate Atomic Density 2246300300011 Uncertainty 2246300300012 COMMENT .ENERGY IN EV CALCULATED BY COMPILER AS 2246300300013 E(EV)= 0.0828/(WAVE-LENGTH-ANGSTROM)**2 2246300300014 STATUS (DEP,22463002) 2246300300015 ENDBIB 13 0 2246300300016 COMMON 5 3 2246300300017 ERR-S ERR-1 ERR-2 ERR-3 ERR-4 2246300300018 PER-CENT FERMI FERMI FERMI FERMI 2246300300019 0.05 0.002 0.001 0.01 0.004 2246300300020 ENDCOMMON 3 0 2246300300021 DATA 4 1 2246300300022 EN-MIN EN-MAX DATA ERR-T 2246300300023 EV EV FERMI FERMI 2246300300024 2.0484E-02 2.2475E-02 9.494 0.027 2246300300025 ENDDATA 3 0 2246300300026 ENDSUBENT 25 0 2246300399999 ENDENTRY 3 0 2246399999999