ENTRY 22210 19930329 00002221000000001 SUBENT 22210001 19930329 00002221000100001 BIB 17 54 2221000100002 REFERENCE (J,NIM/B,52,595,90) 2221000100003 TITLE -MEASUREMENTS OF PRODUCTION CROSS SECTIONS OF 14-C AND 2221000100004 26-AL WITH HIGH-ENERGY NEUTRONS UP TO EN=38 MEV BY 2221000100005 ACCELERATOR MASS SPECTROMETRY. 2221000100006 AUTHOR (M.IMAMURA,H.NAGAI,M.TAKABATAKE,S.SHIBATA,K.KOBAYASHI, 2221000100007 K.YOSHIDA,H.OHASHI,Y.UWAMINO,T.NAKAMURA) 2221000100008 INSTITUTE (2JPNTOK) M.IMAMURA, H.NAGAI, M.TAKABATAKE, S.SHIBATA, 2221000100009 K.KOBAYASHI, K.YOSHIDA, H.OHASHI, Y.UWAMINO. EXPERI- 2221000100010 MENTAL SITE. 2221000100011 (2JPNTOH) T.NAKAMURA. 2221000100012 FACILITY (CYCLO,2JPNTOK) THE AVF CYCLOTRON OF THE INSTITUTE FOR 2221000100013 NUCLEAR STUDY WAS USED FOR THE NEUTRON IRRADIATION. 2221000100014 (VDGT,2JPNTOK) THE 4 MV TANDEM VAN DE GRAAFF OF THE 2221000100015 RESEARCH CENTER FOR NUCLEAR SCIENCE AND TECHNOLOGY WAS2221000100016 USED FOR ACCELERATOR MASS SPECTROMETRY. 2221000100017 INC-SOURCE (P-BE ) NEUTRONS WERE PRODUCED BY BOMBARDING A 1 MM 2221000100018 THICK BERYLLIUM TARGET WITH SEVERAL MICROAMP PROTON 2221000100019 BEAMS OF ENERGIES 22.5, 27.5, 30, 32.5 AND 37.5 MEV. 2221000100020 AT 40 MEV THE BE TARGET THICKNESS WAS 2 MM. THE TARGET2221000100021 WAS BACKED BY A 10 - 11 MM THICK WATER COOLANT, WHICH 2221000100022 FULLY STOPPED THE PROTONS. 2221000100023 (P-LI7) NEUTRONS WERE ALSO PRODUCED WITH 30 AND 35 MEV 2221000100024 PROTONS ON A 2.1 MM THICK LITIUM TARGET ON A STOPPING 2221000100025 GRAPHITE BACKING. 2221000100026 INC-SPECT .THE SEMI-MONOENERGETIC NEUTRON SPECTRA AT 0 DEGREES 2221000100027 WERE MEASURED WITH A NE213 SCINTILLATOR PLACED 1.3 M 2221000100028 FROM THE TARGET. 2221000100029 METHOD (STTA ) TARGET STACKS, INCLUDING AL AND AU MONITOR 2221000100030 FOILS, WERE USED. 2221000100031 (ASEP ) THE 14-C/12-C AND 26-AL/27-AL RATIOS WERE DE- 2221000100032 TERMINED BY ACCELERATOR MASS SEPARATION TECHNIQUES. 2221000100033 DETECTOR (SCIN ) A 51 MM DIAMETER BY 51 MM LONG NE213 LIQUID 2221000100034 SCINTILLATOR WITH N-GAMMA DISCRIMINATION WAS USED TO 2221000100035 DETERMINE THE INCOMING NEUTRON SPECTRA. 2221000100036 PART-DET (13-AL-26-G) AND 2221000100037 (6-C-14) DETECTED IN ACCELERATOR MASS SEPARATION. 2221000100038 MONITOR (13-AL-27(N,A)11-NA-24-G,,SIG) 2221000100039 (79-AU-197(N,2N)79-AU-196-G,,SIG) 2221000100040 SAMPLE .HIGH-PURITY FUSED QUARTZ PLATES, SIO2, WITH 1 MM 2221000100041 THICKNESS, WERE USED AS OXYGEN AND SILICON SAMPLES. 2221000100042 THE SIO2 PLATES WERE WRAPPED WITH AL FOILS TO PREVENT 2221000100043 14-C CONTAMINATION OF TARGETS FROM AIR. HIGH-PURITY 2221000100044 SILICON IN THE FORM OF THIN PLATES AND FLAKES WERE 2221000100045 ALSO USED AS SILICON SAMPLES. THE IRRADIATION TIMES 2221000100046 WERE TYPICALLY 2 - 3 HR. 2221000100047 CORRECTION .THE DATA WERE CORRECTED FOR LOW-ENERGY NEUTRONS. 2221000100048 ERR-ANALYS (DATA-ERR) INCLUDES EXPERIMENTAL UNCERTAINTIES IN THE 2221000100049 MASS SEPARATION AND NEUTRON SPECTRA, AND PROPAGATED 2221000100050 ERRORS IN THE CORRECTION FOR LOW-ENERGY NEUTRONS. 2221000100051 ANALYSIS (UNFLD) THE CROSS SECTIONS WERE OBTAINED USING A SIMPLE2221000100052 ITERATIVE UNFOLDING TECHNIQUE. 2221000100053 STATUS .DATA TAKEN FROM MAIN REF. 2221000100054 HISTORY (921205C) N.O. 2221000100055 (930329E) 2221000100056 ENDBIB 54 0 2221000100057 NOCOMMON 0 0 2221000100058 ENDSUBENT 57 0 2221000199999 SUBENT 22210002 19930329 00002221000200001 BIB 3 4 2221000200002 REACTION (8-O-16(N,X)6-C-14,,SIG) 2221000200003 STATUS .DATA TAKEN FROM MAIN REF. 2221000200004 HISTORY (921205C) N.O. 2221000200005 (930329E) 2221000200006 ENDBIB 4 0 2221000200007 NOCOMMON 0 0 2221000200008 DATA 5 6 2221000200009 EN-MIN EN-MAX DATA DATA-ERR DATA-MAX 2221000200010 MEV MEV MB MB MB 2221000200011 1.7000E+01 2.0700E+01 2.5000E-01 2221000200012 2.2000E+01 2.5800E+01 1.2400E+00 2.0000E-01 2221000200013 2.5000E+01 2.8100E+01 4.2900E+00 3.5000E-01 2221000200014 2.6400E+01 2.8100E+01 4.1400E+00 2.3000E-01 2221000200015 3.1600E+01 3.3100E+01 2.1600E+00 3.0000E-01 2221000200016 3.3000E+01 3.5800E+01 1.4600E+00 5.1000E-01 2221000200017 ENDDATA 8 0 2221000200018 ENDSUBENT 17 0 2221000299999 SUBENT 22210003 19930329 00002221000300001 BIB 3 4 2221000300002 REACTION (14-SI-0(N,X)13-AL-26-G,,SIG) 2221000300003 STATUS .DATA TAKEN FROM MAIN REF. 2221000300004 HISTORY (921205C) N.O. 2221000300005 (930329E) 2221000300006 ENDBIB 4 0 2221000300007 NOCOMMON 0 0 2221000300008 DATA 4 6 2221000300009 EN-MIN EN-MAX DATA DATA-ERR 2221000300010 MEV MEV MB MB 2221000300011 2.5000E+01 2.8100E+01 1.1800E+00 6.0000E-01 2221000300012 2.7000E+01 3.0700E+01 6.2800E+00 4.4000E-01 2221000300013 3.0000E+01 3.3200E+01 1.6300E+01 2.0000E+00 2221000300014 3.1600E+01 3.3100E+01 2.0200E+01 2.4000E+00 2221000300015 3.3000E+01 3.5800E+01 1.7900E+01 3.3000E+00 2221000300016 3.3000E+01 3.8200E+01 2.4200E+01 1.5000E+00 2221000300017 ENDDATA 8 0 2221000300018 ENDSUBENT 17 0 2221000399999 ENDENTRY 3 0 2221099999999