ENTRY 22167 19910205 00002216700000001 SUBENT 22167001 19910205 00002216700100001 BIB 13 37 2216700100002 REFERENCE (J,NIM/A,287,455,9002) 2216700100003 TITLE -FACILITIES FOR NEUTRON INDUCED EXPERIMENTS AT THE 2216700100004 TOHOKU UNIVERSITY CYCLOTRON. 2216700100005 AUTHOR (T.NIIZEKI,H.ORIHARA,K.ISHII,K.MAEDA,M.KABASAWA, 2216700100006 Y.TAKAHASHI,K.MIURA) 2216700100007 INSTITUTE (2JPNTOH) 2216700100008 FACILITY (ISOCY,2JPNTOH)TOHOKU UNIVERSITY AVF CYCLOTRON 2216700100009 INC-SOURCE (P-LI7) 30 MG/CM-SQ THICK SELF-SUPPORTING FOIL OF 2216700100010 NATURAL ABUNDANCE LOCATED AT THE EXIT OF THE BEAM 2216700100011 SWINGER MAGNET. NEUTRONS OF 35 MEV (650 KEV FWHM) WERE2216700100012 PRODUCED AT 0 DEG TO THE PROTON BEAM WITH INCIDENT 2216700100013 PROTON ENERGIES OF 37 MEV. 2216700100014 METHOD (TOF )NEUTRON TIME-OF-FLIGHT SPECTROMETER WITH A BEAM 2216700100015 SWINGER SYSTEM, USING A 44 M FLIGHT PATH. 2216700100016 .TO REDUCE BACKGROUND COMING FROM THE NEUTRON PRODUCING2216700100017 SOURCE IN THE FORWARD DIRECTION AT THE DETECTOR 2216700100018 POSITION, 1 M THICK CONCRETE WALLS AND LEAD AND IRON 2216700100019 COLLIMATORS, AS WELL AS A 90 CM LONG IRON SHADOW BAR, 2216700100020 WERE USED. 2216700100021 DETECTOR (SCIN )AN ARRAY OF 12 LIQUID SCINTILLATOR DETECTORS: 2216700100022 (STANK) FOUR RECTANGULAR BOXES DIMENSIONS 50 X 10 X 2216700100023 5 CM FILLED WITH NE213, AND EIGHT CYLINDRICAL CON- 2216700100024 TAINERS 20.3 CM DIAM AND 5 CM DEEP ALSO FILLED WITH 2216700100025 NE213 LIQUID SCINTILLATOR. 2216700100026 SAMPLE .NATURAL C TARGET 2.0 CM DIAM AND 7.5 CM IN HEIGHT 2216700100027 WEIGHING 39 G AND SUSPENDED ON NEGLIGIBLY THIN NYLON 2216700100028 WIRES. 2216700100029 CORRECTION .SUBTRACTION OF BACKGROUND CONTRIBUTIONS FROM AIR AND 2216700100030 THE NEUTRON SOURCE 2216700100031 .FINITE SCATTERING EFFECT ON NEUTRON YIELDS: ESTIMATION2216700100032 OF MULTIPLE SCATTERING AND ATTENUATION, AND ANGLE 2216700100033 AVERAGING. THESE CORRECTIONS ASSESSED BY MONTE CARLO 2216700100034 SIMULATION USING THE CODE MULTI1. 2216700100035 ERR-ANALYS .NO UNCERTAINTIES GIVEN. 2216700100036 STATUS .DATA OBTAINED FROM AUTHOR BY T.NAKAGAWA. 2216700100037 HISTORY (910118C) S.W. 2216700100038 (910205E) 2216700100039 ENDBIB 37 0 2216700100040 NOCOMMON 0 0 2216700100041 ENDSUBENT 40 0 2216700199999 SUBENT 22167002 19910205 00002216700200001 BIB 3 7 2216700200002 REACTION 1(6-C-12(N,EL)6-C-12,,DA,,RAW) AFTER SUBTRACTION OF 2216700200003 BACKGROUND BUT BEFORE CORRECTION USING MULTI1. 2216700200004 2(6-C-12(N,EL)6-C-12,,DA) AFTER MULTI1 CORRECTION. 2216700200005 STATUS .DATA OBTAINED FROM AUTHOR BY T.NAKAGAWA. DATA CORRES- 2216700200006 PONDS TO FIG 7 OF REFERENCE. 2216700200007 HISTORY (910118C) S.W. 2216700200008 (910205E) 2216700200009 ENDBIB 7 0 2216700200010 COMMON 2 3 2216700200011 EN EN-RSL-FW 2216700200012 MEV MEV 2216700200013 35.0 0.650 2216700200014 ENDCOMMON 3 0 2216700200015 DATA 3 11 2216700200016 ANG-CM DATA-CM 1DATA-CM 2 2216700200017 ADEG MB/SR MB/SR 2216700200018 10.9 839. 1015. 2216700200019 16.3 663. 782. 2216700200020 21.7 510. 615. 2216700200021 32.5 146. 150. 2216700200022 37.9 99.5 112. 2216700200023 43.2 48.7 50.2 2216700200024 53.8 20.4 22.3 2216700200025 64.3 17.0 19.4 2216700200026 74.7 9.27 10.3 2216700200027 84.9 4.72 5.47 2216700200028 95.0 1.85 2.04 2216700200029 ENDDATA 13 0 2216700200030 ENDSUBENT 29 0 2216700299999 ENDENTRY 2 0 2216799999999