ENTRY 21580 19810408 00002158000000001
SUBENT 21580001 19810408 00002158000100001
BIB 16 95 2158000100002
INSTITUTE (2GERBON) INSTITUT FUER STRAHLEN- UND KERNPHYSIK. 2158000100003
W.V.W.,B.G.M,W.R.,K.E. 2158000100004
(2NEDAMS) NATUURKUNDIG LABORATORIUM. 2158000100005
J.B. 2158000100006
REFERENCE (J,NP/A,329,1,141,791008) 2158000100007
(J,PL/B,80,3,187,790101) 2158000100008
AUTHOR (W.VON WITSCH,B.GOMEZ MORENO,W.ROSENSTOCK, 2158000100009
K.ETTLING,J.BRUINSMA) 2158000100010
TITLE -DETERMINATION OF THE NEUTRON-NEUTRON SCATTERING 2158000100011
LENGTH FROM THE H-2(N,NP)N REACTION AT BOMBARDING 2158000100012
ENERGIES BETWEEN 17 MEV AND 27 MEV.- 2158000100013
FACILITY (ISOCY,2GERBON) ISOCHRONOUS CYCLOTRON. 2158000100014
INC-SOURCE (D-D ) 28 MEV DEUTERON BEAM (10 MICRO-AMPERES) 2158000100015
ONTO A LIQUID NITROGEN COOLED HIGH PRESSURE 2158000100016
(90 BAR) DEUTERIUM GAS TARGET. 2158000100017
NEUTRONS EMITTED IN FORWARD DIRECTION WERE 2158000100018
COLLIMATED TO PRODUCE A BEAM OF 22 MM DIAM WITH 2158000100019
AN INTENSITY OF 1.65E+06 NEUTRONS/MEV*CM*CM*S 2158000100020
ON THE TARGET FOR THE HIGHEST ENERGIES. 2158000100021
SAMPLE .C-D(2) TARGET, 50 MG/CM*CM THICK IN THE FIRST, 2158000100022
AND 30 MG/CM*CM IN THE SECOND AND THIRD PART OF 2158000100023
THE EXPERIMENT. IT HAD THE FORM OF AN ELLIPSE 2158000100024
WITH HALF-AXES OF 15 MM AND 10 MM, RESPECTIVELY, 2158000100025
SO THAT IT APPEARED AS A CIRCULAR DISC TO THE BEAM. 2158000100026
METHOD (TOF ) TO DETERMINE THE INCOMING NEUTRON ENERGY, 2158000100027
AND TO DETERMINE THE PROTON ENERGY (TO DISCRIMINATE 2158000100028
AGAINST DEUTERONS AND OTHER CHARGED PARTICLES). 2158000100029
(PHD ) PULSE-HEIGHT DISCRIMINATION TO DO THIS 2158000100030
REJECTION OF OTHER CHARGED PARTICLES ON THE 2158000100031
BASIS OF THEIR TOF. 2158000100032
(REC ) PROTON RECOILS ARE MEASURED TO MONITOR 2158000100033
THE INCOMING NEUTRON FLUX. 2158000100034
(PSD ) PULSE SHAPE DISCRIMINATION IS USED TO 2158000100035
DISTINGUISH NEUTRONS FROM GAMMA-RAYS. 2158000100036
DETECTOR (TELES) PROTON RECOIL TELESCOPE TO MONITOR THE 2158000100037
INCOMING NEUTRON FLUX. 2158000100038
(COIN,SCIN,SCIN) BREAK-UP NEUTRONS ARE DETECTED AT 2158000100039
50 DEGREES WITH A WELL SHIELDED NE213 SCINTILLATOR 2158000100040
IN COINCIDENCE WITH BREAK UP PROTONS EMITTED AT 48 2158000100041
DEGREES ON THE OPPOSITE SIDE OF THE BEAM. THESE 2158000100042
PROTONS ARE DETECTED IN A NE104 PLASTIC 2158000100043
SCINTILLATOR. 2158000100044
THE NE104 SCINTILLATOR HAD A DIAM OF 110 MM. 2158000100045
THE NE213 SCINTILLATOR WAS 76 MM THICK, WITH A 2158000100046
DIAMETER OF 127 MM. 2158000100047
(COIN,SCIN,SOLST) IN A 2ND+3TH PART OF THE EXPERIMENT 2158000100048
THE NE104 PLASTIC SCINTILLATOR WAS REPLACED WITH 2158000100049
SIX 450 MM*MM SI SURFACE BARRIER DETECTORS, MOUNTED 2158000100050
IN TWO VERTICAL ROWS AT 47. AND 49. DEGR 2158000100051
RESPECTIVELY, IN EACH OF WHICH THE THREE DETECTORS 2158000100052
WERE ELECTRONICALLY TREATED AS ONE. 2158000100053
(SCIN ) THE PROTONS PASS THROUGH A SCINTILLATION 2158000100054
FOIL OF 1.5 MG/CM*CM TO PRODUCE THE TOF START 2158000100055
SIGNALS FOR THE PROTON ENERGY MEASUREMENT. 2158000100056
ANALYSIS .IS DONE BY FITTING THE RESULTS OF MONTE CARLO 2158000100057
CALCULATIONS OF THE PROCESS IN POINT GEOMETRY 2158000100058
FOR DIFFERENT POSSIBLE VALUES OF THE SCATTERING 2158000100059
LENGTH TO THE EXPERIMENTAL DATA. 2158000100060
FOR MORE DETAILS ABOUT THESE MONTE CARLO 2158000100061
CALCULATIONS, SEE NP/A,329,1,141. 2158000100062
PART-DET (P ) BREAK-UP PROTONS. 2158000100063
(N ) BREAK UP NEUTRONS. 2158000100064
COMMENT .THE EFFECTIVE RANGE WAS KEPT FIXED AT ITS CHARGE 2158000100065
SYMMETRIC VALUE OF 2.8 FM. VARIATION OF THIS VALUE 2158000100066
BETWEEN 2.5 AND 3.5 FM DOES NOT CHANGE THE 2158000100067
SCATTERING LENGTH BY MORE THAN 0.1 FM. 2158000100068
STATUS .TEXT, MAIN REFERENCE. 2158000100069
HISTORY (800708C) G.C. 2158000100070
(800718E) 2158000100071
CORRECTION .ACCIDENTAL COINCIDENCES. 2158000100072
ERR-ANALYS .THE ERROR CORRESPONDS TO LEAST CHI-SQUARE + 1 2158000100073
OF THE FIT OF THE PROJECTED COINCIDENCE SPECTRUM. 2158000100074
IT INCLUDES STATISTICS AS WELL AS OTHER 2158000100075
EXPERIMENTAL UNCERTAINTIES WHOSE INFLUENCE UPON 2158000100076
THE FINAL RESULT WAS CHECKED WITH MONTE CARLO 2158000100077
CALCULATIONS. 2158000100078
A DETAILED ANALYSIS IS GIVEN IN TABLE 1 OF THE 2158000100079
MAIN REFERENCE - 2158000100080
----------------------------------------------- 2158000100081
SOURCE OF ERROR DELTA(A) 2158000100082
----------------------------------------------- 2158000100083
STATISTICS (EXP.) 0.50 FM 2158000100084
STATISTICS (MONTE CARLO) 0.10 FM 2158000100085
THETA-N ( +-0.1 DEGR) 0.10 FM 2158000100086
THETA-P ( +-0.1 DEGR) 0.10 FM 2158000100087
RELAT. NEUTRON DETECT. EFFICIENCY 0.15 FM 2158000100088
TIME RESOLUTION NEUTRON DETECTOR 0.10 FM 2158000100089
NEUTRON LOSS DUE TO INTERACTIONS 2158000100090
AND SCATTERING 0.15 FM 2158000100091
ENERGY LOSS OF PROTONS ( +- 2158000100092
10. PERCENT) 0.10 FM 2158000100093
MULTIPLE SCATTERING OF PROTONS 0.05 FM 2158000100094
----------------------------------------------- 2158000100095
TOTAL 0.60 FM 2158000100096
----------------------------------------------- 2158000100097
ENDBIB 95 0 2158000100098
NOCOMMON 0 0 2158000100099
ENDSUBENT 98 0 2158000199999
SUBENT 21580002 19810408 00002158000200001
BIB 3 6 2158000200002
REACTION (0-NN-1(N,EL)0-NN-1,,AMP) SCATTERING LENGTH FOR 2158000200003
THE NEUTRON-NEUTRON INTERACTION IN THE NEUTRON 2158000200004
INDUCED BREAK UP OF DEUTERIUM (1-H-2(N,2N)1-H-1). 2158000200005
STATUS .TEXT, MAIN REFERENCE. 2158000200006
HISTORY (800708C) G.C. 2158000200007
(800718E) 2158000200008
ENDBIB 6 0 2158000200009
NOCOMMON 0 0 2158000200010
DATA 4 1 2158000200011
EN-MIN EN-MAX DATA DATA-ERR 2158000200012
MEV MEV FERMI FERMI 2158000200013
2.1000E+01 2.7000E+01-1.6900E+01 6.0000E-01 2158000200014
ENDDATA 3 0 2158000200015
ENDSUBENT 14 0 2158000299999
ENDENTRY 2 0 2158099999999