ENTRY 20700 19840416 00002070000000001 SUBENT 20700001 19840416 00002070000100001 BIB 16 57 2070000100002 INSTITUTE (2JPNKTO) 2070000100003 (1USARPI) R.C.BLOCK. 2070000100004 REFERENCE (J,NP/A,258,(1),1,7602) 2070000100005 ((P,NEANDC(J)-42L,25,7509)=(P,INDC(JAP)-28L,25,7509)) 2070000100006 PRELIMINARY DESCRIPTION. 2070000100007 AUTHOR (Y.FUJITA,K.KOBAYASHI,T.OOSAKI,R.C.BLOCK) 2070000100008 TITLE -MEASUREMENT OF THE NEUTRON-PROTON TOTAL CROSS 2070000100009 SECTION USING 24-KEV IRON FILTERED NEUTRONS- 2070000100010 FACILITY (LINAC) 46 MEV ELECTRON LINAC OF THE RESEARCH 2070000100011 REACTOR INSTITUTE FROM KYOTO UNIVERSITY. 2070000100012 INC-SOURCE (PHOTO) WATER COOLED PHOTONEUTRON TARGET MADE OF 2070000100013 TANTALUM PLATES WITH A 5 CM THICK POLYETHYLENE 2070000100014 MODERATOR. 2070000100015 .A PURE IRON FILTER OF 30 CM THICKNESS WAS USED FOR 2070000100016 FILTERING THE NEUTRON BEAM. 2070000100017 INC-SPECT .IRON FILTERED NEUTRON SPECTRUM PEAKED AT 24.3 KEV 2070000100018 WITH AN ENERGY WIDTH OF ABOUT 2 KEV. 2070000100019 .LOWER ENERGY LIMIT = 17.5 KEV 2070000100020 .UPPER ENERGY LIMIT = 26.3 KEV 2070000100021 SAMPLE .PURE WATER REPLACED BY A OPTICALY FLAT SIO2 PLATE. 2070000100022 .PLATE THICKNESS = 1 AND 2 CM. 2070000100023 METHOD (TOF ) 22.2 M FLIGHT PATH. 2070000100024 .IRON FILTERED BEAM. 2070000100025 .TRANSMISSION MEASUREMENT. 2070000100026 DETECTOR (NAICR) FOR NEUTRON DETECTION A BARE 12.7 CM 2070000100027 DIAM. BY 5.08 CM THICK NAI(TL) CRYSTAL WAS USED. 2070000100028 (PROPC) A BF3 PROPORTIONAL COUNTER WAS USED FOR 2070000100029 MONITORING THE NEUTRON INTENSITY. 2070000100030 ANALYSIS .EFFECTIVE NEUTRON ENERGY CALCULATED BY FORMULA 1 2070000100031 OF REFERENCE, SEE DETAILS IN P.5 OF TEXT. 2070000100032 .N-P CROSS SECTION CALCULATED BY SUBSTRACTING 2070000100033 CONTRIBUTIONS OF OXIGEN AND SIO2 WHOSE CROSS 2070000100034 SECTIONS WERE TAKEN FROM R.C.BLOCK ET.AL. J. OF 2070000100035 NUCL.SCI.TECHN.12(1975)1. 2070000100036 COMMENT .PRESENT RESULT IS VERY CLOSE TO THAT OBTAINED WITH 2070000100037 THE EFFECTIVE RANGE FORMULA USING THE LOMON AND 2070000100038 WILSON PARAMETER VALUES,PHYS.REV. C9 (1974) 1392, 2070000100039 AND IS FAR FROM THE DILG VALUES,PHYS. REV. C11, 2070000100040 (1975) 103. 2070000100041 .CROSS SECTION MEASURED WITH GREAT ACCURACITY. 2070000100042 STATUS .DATA TAKEN FROM REFERENCE. 2070000100043 HISTORY (760923C) 2070000100044 (771109E) 2070000100045 (840106U) A.P.T. JAPAN CODE CHANGED TO JPN 2070000100046 (840106E) 2070000100047 CORRECTION .BACKGROUND ESTIMATED FROM FLIGHT-TIME SPECTRUM OUT 2070000100048 OF 24.3 KEV PEAK. 2070000100049 .CORRECTIONS DUE TO DEUTERIUM IN WATER, DOPPLER 2070000100050 EFFECT AND CAPTURE TO SCATTERING RATIO WERE 2070000100051 APROXIMATELY ESTIMATED TO BE 3.E-5, 2.E-6 AND 2070000100052 2.E-5 RESPECTIVELY. 2070000100053 .MOLECULAR BINDING EFFECT ESTIMATED TO 1.E-6. 2070000100054 ERR-ANALYS .ERRORS IN EFFECTIVE ENERGY COME MAINLY FROM THE 2070000100055 STATISTICS OF THE NEUTRON SPECTRUM. 2070000100056 (DATA-ERR) ERROR IN CROSS SECTION IS 2070000100057 MAINLY STATISTICAL (0.096 P.C.) ,SEE DETAILS IN 2070000100058 TABLE 4 OF REFERENCE. 2070000100059 ENDBIB 57 0 2070000100060 NOCOMMON 0 0 2070000100061 ENDSUBENT 60 0 2070000199999 SUBENT 20700002 19840127 00002070000200001 BIB 2 3 2070000200002 REACTION (1-H-1(N,TOT),,SIG) 2070000200003 COMMENT .HEADING EN IS A CALCULATED EFFECTIVE ENERGY,SEE 2070000200004 ANALYSIS KEYWORD. 2070000200005 ENDBIB 3 0 2070000200006 NOCOMMON 0 0 2070000200007 DATA 4 1 2070000200008 EN EN-ERR DATA DATA-ERR 2070000200009 KEV KEV B B 2070000200010 2.3645E+01 6.8000E-02 1.7740E+01 2.3000E-02 2070000200011 ENDDATA 3 0 2070000200012 ENDSUBENT 11 0 2070000299999 ENDENTRY 2 0 2070099999999