ENTRY 21536 19810205 00002153600000001 SUBENT 21536001 19810205 00002153600100001 BIB 16 65 2153600100002 INSTITUTE (2BLGLVN) LOUVAIN-LA-NEUVE. 2153600100003 REFERENCE (J,PL/B,82,2,212,790326) FINAL REPORT. 2153600100004 (C,78GRAZ,1,54,7808) PRELIMINARY RESULTS. ABSTRACT. 2153600100005 AUTHOR (M.BOSMAN,A.BOL,J.F.GILOT,P.LELEUX,P.LIPNIK, 2153600100006 P.MACQ) 2153600100007 TITLE -MEASUREMENT OF THE TOTAL CROSS SECTION FOR THE 2153600100008 H-1(N,G)H-2 REACTION BETWEEN 37 AND 72 MEV.- 2153600100009 FACILITY (CYCLO,2BLGLVN) SYNCHRONOUS CYCLOTRON CYCLONE OF 2153600100010 LOUVAIN-LA-NEUVE. 2153600100011 INC-SOURCE (P-LI7) 3 MICRO-AMPERE PROTON BEAMS OF 40, 50, 55, 2153600100012 60, 65 AND 75 MEV IMPINGING ON 4 MM THICK LI-TARGET. 2153600100013 SAMPLE .LIQUID H(2) TARGET, 4.5 MM OR 6.5 MM THICK, 4 CM 2153600100014 DIAM, 3 M DOWNSTREAM THE NEUTRON PRODUCTION TARGET. 2153600100015 ITS VACUUM JACKET HAS HAVAR WINDOWS OF 5 MG/CM*CM 2153600100016 AND 10 MG/CM*CM RESPECTIVILY. 2153600100017 METHOD (TOF ) TIME-OF-FLIGHT MEASURED BETWEEN BEAM PICK-OFF 2153600100018 AND DETECTOR S1, BETWEEN S1 AND S2, AND BETWEEN S1 2153600100019 AND S5. 2153600100020 (COINC) FAST PROTONS ARE DETECTED BY A COINCIDENCE 2153600100021 PC1(-),PC2(+),S1(+),S2(+),S3(+),S4(-),S5(+), WHERE 2153600100022 + MEANS SIGNAL AND - MEANS NO SIGNAL. DEUTERONS AND 2153600100023 SLOW PROTONS ARE DETECTED BY PC1(-),PC2(+),S1(+), 2153600100024 S2(+),S3(-). THESE 2 KINDS OF COINCIDENCES TRIGGER 2153600100025 THE RECORDING OF AN EVENT, WHICH IS THEN STORED ON 2153600100026 MAGNETIC TAPE WITH THE PARAMETERS IS (1) THE KIND OF 2153600100027 COINCIDENCE, (2) THE PULSE HEIGHTS FROM PC1, PC2, 2153600100028 S1,S2,S3,S4,S5, AND (3) THE TIME-OF-FLIGHTS MENTIONED 2153600100029 ABOVE. 2153600100030 DETECTOR (PROPC) TWO PROPORTIONAL COUNTERS ARE USED : PC1, PC2. 2153600100031 PC1 - GAS PROPORTIONAL COUNTER IN FRONT OF THE LIQUID 2153600100032 HYDROGEN TARGET TO REJECT CHARGED PARTICLES 2153600100033 CONTAMINATING THE NEUTRON BEAM (ABOUT 1.E-4). 2153600100034 FILLED WITH ISOBUTANE-METHYLAL-ARGON MIXTURE, 2153600100035 5 MG/CM*CM HAVAR-WINDOWS. 2153600100036 PC2 - GAS PROPORTIONAL COUNTER BEHIND THE H(2)- 2153600100037 TARGET, 2 CM THICK, TRIGGERS ON CHARGED 2153600100038 PARTICLES FROM THE TARGET REGION, FILLED WITH 2153600100039 SAME GAS AS PC1, 2.7 MG/CM*CM AL-WINDOWS. 2153600100040 (SCIN ) FIVE SCINTILLATION COUNTERS : S1,S2,S3,S4,S5. 2153600100041 S1 - DE-COUNTER JUST BEHIND PC2. 0.1 OR 0.5 MM THIN. 2153600100042 S2 - E-COUNTER, THICKNESS ADJUSTED TO MAXIMUM RANGE 2153600100043 OF THE DEUTERONS, COVERING THE HOLE LABORATORY 2153600100044 ANGLE OF DEUTERON EMISSION ( 7. DEGREES). 2153600100045 S3 - SLIGHTLY LARGER THAN S2 AND JUST BEHIND IT. 2153600100046 S4 - BEHIND S3 AT A LAB-ANGLE OF 3.3 DEGREES, WITH A 2153600100047 3 CM DIAM HOLE IN IT, DEFINING THE SOLID ANGLE 2153600100048 OF S5 JUST BEHIND IT. 2153600100049 S5 - 5 CM THICK, 5 CM DIAM. 2153600100050 MONITOR (1-H-1(N,EL)1-H-1,,DA) ELASTICALLY SCATTERED PROTONS 2153600100051 AT 3.3 DEGREES LAB-ANGLE, I.E. 173. DEGR. CMS-ANGLE. 2153600100052 ONLY KNOWN WITH A PRECISION OF ABOUT 5 PERC AND SO 2153600100053 THE MAIN SOURCE OF ERROR OF THE MEASUREMENTS. 2153600100054 PART-DET (D ) 2153600100055 COMMENT .MEASUREMENTS SHOW THAT THERE IS NO DISCREPANCY 2153600100056 BETWEEN EXPERIMENT AND THEORY IN THIS ENERGY 2153600100057 REGION. DEUTERON PHOTO-DISINTIGRATION CROSS SECTIONS 2153600100058 ARE CALCULATED FROM THE CAPTURE DATA. 2153600100059 STATUS .DATA TAKEN FROM MAIN REFERENCE. 2153600100060 HISTORY (800430C) G.C. 2153600100061 (800603E) 2153600100062 CORRECTION .BACKGROUND CORRECTION BY SUBSTRACTION OF DUMMY 2153600100063 SAMPLE MEASUREMENT. 2153600100064 ERR-ANALYS .ERROR-BARS REPRESENT THE CONSISTENCY ERROR TAKEN 2153600100065 OVER SUCCESSIVE PAIRS OF MEASUREMENTS WITH H(2) 2153600100066 AND DUMMY TARGET. 2153600100067 ENDBIB 65 0 2153600100068 COMMON 1 3 2153600100069 MONIT-ERR 2153600100070 PER-CENT 2153600100071 5.0000E+00 2153600100072 ENDCOMMON 3 0 2153600100073 ENDSUBENT 72 0 2153600199999 SUBENT 21536002 19800603 00002153600200001 BIB 3 4 2153600200002 REACTION (1-H-1(N,G)1-H-2,,SIG) 2153600200003 STATUS .TABLE 1 OF MAIN REFERENCE. 2153600200004 HISTORY (800430C) G.C. 2153600200005 (800603E) 2153600200006 ENDBIB 4 0 2153600200007 NOCOMMON 0 0 2153600200008 DATA 5 7 2153600200009 EN EN-RSL MONIT DATA DATA-ERR 2153600200010 MEV MEV MB/SR MB MB 2153600200011 3.7000E+01 1.4000E+00 2.3200E+01 2.1200E-02 1.6000E-03 2153600200012 4.2200E+01 1.3000E+00 2.0400E+01 2.0600E-02 1.4000E-03 2153600200013 4.7300E+01 1.2000E+00 1.8200E+01 1.7000E-02 7.0000E-04 2153600200014 5.2400E+01 1.1000E+00 1.6700E+01 1.7600E-02 9.0000E-04 2153600200015 5.7400E+01 1.0000E+00 1.5400E+01 1.5800E-02 1.1000E-03 2153600200016 6.2500E+01 1.0000E+00 1.4400E+01 1.4600E-02 1.1000E-03 2153600200017 7.2600E+01 9.0000E-01 1.2800E+01 1.4700E-02 1.1000E-03 2153600200018 ENDDATA 9 0 2153600200019 ENDSUBENT 18 0 2153600299999 ENDENTRY 2 0 2153699999999