ENTRY 21632 19810415 00002163200000001 SUBENT 21632001 19810415 00002163200100001 BIB 14 56 2163200100002 INSTITUTE (2GERBON) INSTITUT FUER STRAHLEN- UND KERNPHYSIK. 2163200100003 REFERENCE (J,PL/B,91,342,800421) 2163200100004 AUTHOR (W.VON WITSCH,B.GOMEZ MORENO,W.ROSENSTOCK, 2163200100005 R.FRANKE,B.STEINHEUER) 2163200100006 TITLE -NEUTRON-NEUTRON EFFECTIVE RANGE FROM A COMPARISON 2163200100007 OF N-N AND N-P QUASI-FREE SCATTERING AT 24. MEV.- 2163200100008 FACILITY (ISOCY,2GERBON) ISOCHRONOUS CYCLOTRON. 2163200100009 INC-SOURCE (D-D ) 27 MEV DEUTERON BEAM (3 MICRO-AMPERES) 2163200100010 ONTO A LIQUID NITROGEN COOLED HIGH PRESSURE 2163200100011 (25 BAR) DEUTERIUM GAS TARGET. 2163200100012 NEUTRONS EMITTED IN FORWARD DIRECTION WERE 2163200100013 COLLIMATED TO PRODUCE A BEAM WITH 2163200100014 AN INTENSITY OF 5.6E+06 NEUTRONS/S 2163200100015 ON THE TARGET. 2163200100016 SAMPLE .C-D(2) TARGET, 50 MG/CM*CM THICK IN THE FIRST, 2163200100017 22. MM LONG * 20. MM DIAM IN THE 2ND EXPERIMENT. 2163200100018 METHOD (TOF) TO DETERMINE THE PROTON ENERGY (DISCRIMINATION 2163200100019 AGAINST DEUTERONS AND OTHER CHARGED PARTICLES). 2163200100020 (PHD ) PULSE-HEIGHT DISCRIMINATION TO DO THIS 2163200100021 REJECTION OF OTHER CHARGED PARTICLES ON THE 2163200100022 BASIS OF THEIR TOF. 2163200100023 (REC ) PROTON RECOILS ARE MEASURED TO MONITOR 2163200100024 THE INCOMING NEUTRON FLUX. 2163200100025 (PSD ) PULSE SHAPE DISCRIMINATION IS USED TO 2163200100026 DISTINGUISH NEUTRONS FROM GAMMA-RAYS. 2163200100027 DETECTOR (TELES) PROTON RECOIL TELESCOPE TO MONITOR THE 2163200100028 INCOMING NEUTRON FLUX. 2163200100029 (COIN,SCIN,SCIN) BREAK-UP NEUTRONS ARE DETECTED AT 2163200100030 50 DEGREES WITH A WELL SHIELDED NE213 SCINTILLATOR 2163200100031 IN COINCIDENCE WITH BREAK UP PROTONS EMITTED AT 2163200100032 -34.1 DEGREES WITH RESPECT TO THE BEAM. THESE 2163200100033 PROTONS ARE DETECTED IN A NE104 PLASTIC 2163200100034 SCINTILLATOR (1ST EXP. - N-P QUASI FREE SCATTERING) 2163200100035 IN THE 2ND EXPERIMENT (N-N QUASI-FREE SCATTERING) 2163200100036 THE NE104 IS REPLACED WITH A NE213 SCINTILLATOR. 2163200100037 (SCIN ) THE PROTONS PASS THROUGH A SCINTILLATION 2163200100038 FOIL OF 1.5 MG/CM*CM TO PRODUCE THE TOF START 2163200100039 SIGNALS FOR THE PROTON ENERGY MEASUREMENT. 2163200100040 ANALYSIS .IS DONE BY FITTING THE RESULTS OF MONTE CARLO 2163200100041 CALCULATIONS OF THE PROCESS 2163200100042 FOR DIFFERENT POSSIBLE VALUES OF THE SCATTERING 2163200100043 LENGTH AND THE EFFECTIVE RANGE TO THE 2163200100044 EXPERIMENTAL DATA. 2163200100045 STATUS .TEXT, MAIN REFERENCE. 2163200100046 HISTORY (800814C) G.C. 2163200100047 (800829E) 2163200100048 CORRECTION .ACCIDENTAL COINCIDENCES. 2163200100049 ERR-ANALYS (DATA-ERR) TOTAL ERROR IS GIVEN. THE MAIN 2163200100050 CONTRIBUTIONS ARE DUE TO THE ABSOLUTE 2163200100051 EFFICIENCY OF THE NEUTRON DETECTOR USED AT 34. 2163200100052 DEGREES (5.0 PERC), STATISTICS INCLUDING 2163200100053 SUBTRACTION OF ACCIDENTAL BACKGROUND IN THE 2163200100054 N-N MEASUREMENT(4.5 PERC), UNCERTAINTIES IN 2163200100055 THE SETTING OF THE BOUNDERIES OF THE TOF 2163200100056 MATRICES (3.2 PERC) AND STATISTICS IN THE N-P 2163200100057 EXPERIMENT (2.4 PERC). 2163200100058 ENDBIB 56 0 2163200100059 NOCOMMON 0 0 2163200100060 ENDSUBENT 59 0 2163200199999 SUBENT 21632002 19810415 00002163200200001 BIB 3 8 2163200200002 REACTION ((1-H-1(N,EL)1-H-1,,SIG)/ 2163200200003 (0-NN-1(N,EL)0-NN-1,,SIG)) RATIO OF THE CROSS 2163200200004 SECTIONS OF THE NEUTRON-NEUTRON INTERACTION AND 2163200200005 THE NEUTRON-PROTON INTERACTION IN THE NEUTRON 2163200200006 INDUCED BREAK-UP OF DEUTERIUM (1-H-2(N,2N)1-H-1). 2163200200007 STATUS .TEXT,MAIN REFERENCE. 2163200200008 HISTORY (800814C) G.C. 2163200200009 (800829E) 2163200200010 ENDBIB 8 0 2163200200011 NOCOMMON 0 0 2163200200012 DATA 4 1 2163200200013 EN EN-RSL DATA DATA-ERR 2163200200014 MEV MEV NO-DIM NO-DIM 2163200200015 2.4000E+01 2.0000E+00 3.7100E+00 3.0000E-01 2163200200016 ENDDATA 3 0 2163200200017 ENDSUBENT 16 0 2163200299999 ENDENTRY 2 0 2163299999999