ENTRY 22277 19961223 00002227700000001 SUBENT 22277001 19961223 00002227700100001 BIB 16 60 2227700100002 INSTITUTE (2SWDUPP) 2227700100003 REFERENCE (J,PRL,75,1046,9508) 2227700100004 (C,94GATLIN,,60,9405) REFERENCE ADDED 961223. 2227700100005 AUTHOR (T.E.O.ERICSON,B.LOISEAU,J.NILSSON,N.OLSSON,J.BLOMGREN,2227700100006 H.CONDE,K.ELMGREN,O.JONSSON,L.NILSSON,P.U.RENBERG, 2227700100007 A.RINGBOM,T.ROENNQVIST,G.TIBELL,R.ZORRO) 2227700100008 TITLE -THE PI-NN COUPLING FROM HIGH PRECISION NP CHARGE 2227700100009 EXCHANGE AT 162 MEV. 2227700100010 FACILITY (CYCLO) THE GUSTAF WERNER CYCLOTRON AT THE SVEDBERG 2227700100011 LABORATORY, UPPSALA UNIVERSITY, WAS USED. 2227700100012 INC-SOURCE (P-LI7) A PROTON BEAM OF 162 MEV IMPINGED ON A 427 2227700100013 MG/CM2 THICK LITHIUM TARGET, ENRICHED TO 99.98 PER- 2227700100014 CENT IN 7-LI. THE UNAFFECTED PROTON BEAM WAS BENT BY 2227700100015 A MAGNET INTO A WELL-SHIELDED BEAM DUMP, WHILE THE 2227700100016 NEUTRONS WERE COLLIMATED IN A NARROW CONE AT 0 DEGREES2227700100017 BY A HEAVY COLLIMATOR SYSTEM, BEFORE ENTERING THE EX- 2227700100018 PERIMENTAL AREA ABOUT 8 M AFTER THE PRODUCTION TARGET.2227700100019 THE NEUTRON BEAM SPOT AT THE IRRADIATION POSITION HAD 2227700100020 A DIAMETER OF 7 CM. 2227700100021 INC-SPECT .THE NEUTRONS SHOWED A SEMI-MONOENERGETIC NEUTRON SPEC-2227700100022 TRUM, WITH A FULL ENERGY PEAK AND A LOW-ENERGY TAIL. 2227700100023 THE LATTER WAS SUPRESSED BY TOF TECHNIQUES. 2227700100024 SAMPLE .FOUR 100 MG/CM2 THICK CH2 TARGETS WERE MOUNTED IN A 2227700100025 MULTITARGET SYSTEM WITH MULTIWIRE PROPORTIONAL 2227700100026 CHAMBERS BETWEEN THE TARGETS. IN THIS WAY THE ENERGY 2227700100027 LOSS IN THE SUBSEQUENT TARGETS COULD BE CORRECTED FOR.2227700100028 FOR ANGLES LARGER THAN 15 DEGREES, PROTONS FROM REAC- 2227700100029 TIONS ON CARBON IN THE TARGET CHAMBER FOILS CAN INTER-2227700100030 FERE, AND TWO 185 MG/CM2 12-C TARGET WAS USED TO 2227700100031 CORRECT FOR THAT. 2227700100032 DETECTOR (MAGSP) THE RECOIL PROTONS WERE DETECTED BY A MAGNETIC 2227700100033 SPECTROGRAPH, EQUIPPED WITH FOUR POSITION-SENSITIVE 2227700100034 DRIFT CHAMBERS AND THREE TRIGGER SCINTILLATORS. THE 2227700100035 PROTON ENERGY AND EMISSION ANGLE WAS DETERMINED BY 2227700100036 RAY-TRACING THROUGH THE MAGNETIC FIELD. 2227700100037 (MWPC ) 2227700100038 (SCIN ) 2227700100039 PART-DET (P ) 2227700100040 ANALYSIS (INTAD) GAUSSIANS WERE FITTED TO THE PROTON PEAK FOR 2227700100041 EACH ANGULAR BIN. SINCE THE DATA ONLY SPAN A PART OF 2227700100042 THE FULL ANGULAR RANGE, IT WAS EXTRAPOLATED BY USING 2227700100043 THE VZ40 SOLUTION OF THE ARNDT ET AL PHASE-SHIFT ANA- 2227700100044 LYSIS. IN THIS WAY THE DIFFERENTIAL DATA COULD BE 2227700100045 INTEGRATED AND NORMALIZED TO THE TOTAL CROSS SECTION. 2227700100046 MONITOR (1-H-1(N,TOT),,SIG) VALUE FROM LISOWSKI. IN ADDITION 2227700100047 TO THE STATISTICAL ERROR GIVEN, THERE IS A 1 PERCENT 2227700100048 SYSTEMATIC ERROR. 2227700100049 CORRECTION .THE DATA WERE CORRECTED FOR BACKGROUND AND FOR ACCEP- 2227700100050 TANCE EFFECTS. 2227700100051 ERR-ANALYS (DATA-ERR) THE ERRORS GIVEN ARE MAINLY STATISTICAL AND 2227700100052 ORIGINATE FROM COUNTING STATISTICS, THE PEAK-FITTING 2227700100053 PROCEDURE AND 12-C BACKGROUND SUBTRACTION. IN ADDI- 2227700100054 TION, THERE IS A SYSTEMATIC CROSS SECTION SCALE UN- 2227700100055 CERTAINTY OF 4 PER-CENT. 2227700100056 STATUS .DATA TAKEN FROM MAIN REF. 2227700100057 HISTORY (950902C) N.O. 2227700100058 (951213E) 2227700100059 (961022A) * * CORRECTED BY S. MAEV * * 2227700100060 (961223A) NEW REFERENCE ADDED. N.O. 2227700100061 (970214E) 2227700100062 ENDBIB 60 0 2227700100063 NOCOMMON 0 0 2227700100064 ENDSUBENT 63 0 2227700199999 SUBENT 22277002 19961022 00002227700200001 BIB 3 8 2227700200002 REACTION (1-H-1(N,EL)1-H-1,,DA) 2227700200003 STATUS .DATA TAKEN FROM MAIN REF. 2227700200004 HISTORY (950902C) N.O. 2227700200005 (951213E) 2227700200006 (961022A) REACTION SF4 FIELD ADDED AND 2227700200007 ENERGIES FROM DATA TO COMMON SECTION MOVED 2227700200008 EN-RSL-HW CHANGED TO EN-ERR, EN-RSL-FW GIVEN2227700200009 (970214E) 2227700200010 ENDBIB 8 0 2227700200011 COMMON 5 3 2227700200012 EN EN-ERR EN-RSL-FW MONIT MONIT-ERR 2227700200013 MEV MEV MEV MB MB 2227700200014 1.6200E+02 5.0000E-01 1.2000E+00 4.8831E+01 3.0153E-01 2227700200015 ENDCOMMON 3 0 2227700200016 DATA 3 31 2227700200017 ANG-CM DATA-CM DATA-ERR 2227700200018 ADEG MB/SR MB/SR 2227700200019 1.1900E+02 3.5500E+00 1.0000E-01 2227700200020 1.2100E+02 3.6100E+00 1.0000E-01 2227700200021 1.2300E+02 3.9900E+00 1.1000E-01 2227700200022 1.2500E+02 4.0900E+00 1.1000E-01 2227700200023 1.2700E+02 4.1900E+00 1.1000E-01 2227700200024 1.2900E+02 4.3200E+00 1.1000E-01 2227700200025 1.3100E+02 4.4700E+00 1.1000E-01 2227700200026 1.3300E+02 4.7800E+00 1.1000E-01 2227700200027 1.3500E+02 4.7900E+00 1.3000E-01 2227700200028 1.3700E+02 5.3000E+00 9.0000E-02 2227700200029 1.3900E+02 5.3400E+00 1.0000E-01 2227700200030 1.4100E+02 5.8100E+00 1.1000E-01 2227700200031 1.4300E+02 5.6400E+00 1.2000E-01 2227700200032 1.4500E+02 5.8200E+00 1.3000E-01 2227700200033 1.4700E+02 6.4300E+00 1.3000E-01 2227700200034 1.4900E+02 6.5500E+00 1.1000E-01 2227700200035 1.5100E+02 6.7900E+00 9.0000E-02 2227700200036 1.5300E+02 7.1200E+00 8.0000E-02 2227700200037 1.5500E+02 7.4300E+00 9.0000E-02 2227700200038 1.5700E+02 7.9800E+00 1.0000E-01 2227700200039 1.5900E+02 8.3700E+00 1.0000E-01 2227700200040 1.6100E+02 8.8300E+00 1.0000E-01 2227700200041 1.6300E+02 9.3900E+00 1.1000E-01 2227700200042 1.6500E+02 9.9100E+00 1.0000E-01 2227700200043 1.6700E+02 1.0660E+01 1.3000E-01 2227700200044 1.6900E+02 1.1770E+01 1.7000E-01 2227700200045 1.7100E+02 1.2250E+01 1.9000E-01 2227700200046 1.7300E+02 1.3080E+01 2.0000E-01 2227700200047 1.7500E+02 1.3270E+01 2.0000E-01 2227700200048 1.7700E+02 1.3850E+01 2.3000E-01 2227700200049 1.7900E+02 1.3940E+01 2.2000E-01 2227700200050 ENDDATA 33 0 2227700200051 ENDSUBENT 50 0 2227700299999 ENDENTRY 2 0 2227799999999