ENTRY MTK69 0 MTK69 0 1 SUBENT MTK69 1 0 MTK69 1 1 BIB 12 63 MTK69 1 2 INSTITUTES (UKOXF) MTK69 1 3 (SLNIJS) MTK69 1 4 REFERENCE (J,NP/A,138,253,1969) MTK69 1 5 AUTHORS (W.M.MASON,N.W.TANNER,G.KERNEL) MTK69 1 6 TITLE MECHANISM OF THE 31P(P,GAMMA)32S REACTION IN THE MTK69 1 7 GIANT DIPOLE RESONANCE REGION MTK69 1 8 FACILITY (VDG) TANDEM VAN DE GRAAFF ACCELERATOR, OXFORD MTK69 1 9 UNIVERSITY, OXFORD, U.K. NO DETAILS GIVEN. MTK69 1 10 INC-PART (P) PROTONS. MTK69 1 11 TARGETS PHOSPHORUS EVAPORATED ONTO THIN CARBON BACKINGS OF MTK69 1 12 THICKNESS APPROXIMATELY EQUAL TO 20 MICROGRAMS/CM**2. MTK69 1 13 TARGET THICKNESS WAS DETERMINED BY PERFORMING AN MTK69 1 14 EXCITATION FUNCTION MEASUREMENT ON THE NARROW MTK69 1 15 RESONANCE AT EP = 4.665 MEV IN THE 31P(P,GAMMA-0)32S MTK69 1 16 REACTION. THE THICKNESSES RANGED FROM 10 - 25 KEV. MTK69 1 17 METHOD PROTON BEAMS IN THE ENERGY RANGE EP = 9.5 - 11.5 MTK69 1 18 MEV WERE OBTAINED FROM THE OXFORD TANDEM VAN DE MTK69 1 19 GRAAFF ACCELERATOR. THE BEAM WAS FOCUSSED THROUGH A MTK69 1 20 3-MM DIAMETER URANIUM COLLIMATOR. IT PASSED THROUGH MTK69 1 21 THE TARGET FOIL AND ULTIMATELY WAS STOPPED ON A MTK69 1 22 URANIUM DISK FROM WHICH ALL THE RADIATION COUNTERS MTK69 1 23 USED IN THE EXPERIMENT WERE SHIELDED BY A CONCRETE MTK69 1 24 WALL. TYPICAL BEAM CURRENTS WERE 200 - 250 NANOAMPS MTK69 1 25 AND THE INTEGRATED PROTON CHARGE ON TARGET PER MTK69 1 26 RUN VARIED FROM 100 - 150 MICROCOULOMB. THE MTK69 1 27 COLLIMATOR CURRENT FRACTION WAS USUALLY LESS THAN MTK69 1 28 0.002 RELATIVE TO THE TRANSMITTED BEAM CURRENT. ONLY MTK69 1 29 THE GROUND-STATE (GAMMA-0) AND FIRST-EXCITED-STATE MTK69 1 30 (GAMMA-1) TRANSITIONS WERE CONSIDERED IN THIS MTK69 1 31 EXPERIMENT. GAMMA-RAY YIELD EXCITATION FUNCTIONS MTK69 1 32 WERE MEASURED AT ALL THE INDICATED ANGLES IN ENERGY MTK69 1 33 STEPS OF 20 KEV. THE GAMMA-0 AND GAMMA-1 TRANSITIONS MTK69 1 34 WERE REASONABLY WELL RESOLVED IN ALL THE NAI DETECTOR MTK69 1 35 SPECTRA. THE GAMMA-0 LINE SHAPE WAS DETERMINED FROM MTK69 1 36 MEASUREMENTS OF 3H(P,GAMMA)4HE. THIS ENABLED THE MTK69 1 37 YIELDS OF THE INDIVIDUAL TRANSITIONS TO BE READILY MTK69 1 38 UNFOLDED FROM THE SPECTRA. IN ORDER TO NORMALIZE MTK69 1 39 THE VARIOUS MEASURED EXCITATION FUNCTIONS, ANGULAR MTK69 1 40 DISTRIBUTION DATA AT EACH ENERGY WERE FITTED WITH MTK69 1 41 LEGENDRE-POLYNOMIAL EXPANSIONS UP TO FOURTH ORDER. MTK69 1 42 DETECTORS (SCINT) NAI(TL) SCINTILLATION CRYSTAL DETECTORS MTK69 1 43 WERE USED. SEVERAL NAI DETECTORS OF 12.5 CM X 15 MTK69 1 44 CM WERE USED: AT 45, 75, AND 105 DEGREES (RUN I), MTK69 1 45 30, 64, 98, AND 132 DEGREES (RUN II), AND 90 MTK69 1 46 DEGREES (RUN III). THE GIVEN ANGLES WERE MEASURED MTK69 1 47 RELATIVE TO THE INCIDENT PROTON BEAM. THESE MTK69 1 48 DETECTORS WERE ALL SITUATED 38 CM FROM THE TARGET. MTK69 1 49 A LARGER NAI DETECTOR OF 24 CM X 30 CM WAS USED IN MTK69 1 50 THE EXPERIMENT FOR NORMALIZATION PURPOSES AS IS MTK69 1 51 DISCUSSED IN GREATER DETAIL IN SECTION 2 OF THE MTK69 1 52 ORIGINAL PAPER. MTK69 1 53 MONITORS (CI) CURRENT INTEGRATOR. MTK69 1 54 (SCINT) 24 CM X 30 CM NAI(TL) SCINTILLATION MTK69 1 55 DETECTOR. MTK69 1 56 CORRECTION SPECTRAL DATA WERE CORRECTED FOR COSMIC-RAY MTK69 1 57 BACKGROUND, FINITE SOLID ANGLE, AND GAMMA-RAY MTK69 1 58 ANGULAR DISTRIBUTION EFFECTS. CORRECTIONS WERE MTK69 1 59 ALSO APPLIED FOR DEAD-TIME AND PILE-UP REJECTION MTK69 1 60 LOSSES. THESE LATTER EFFECTS AMOUNTED TO NO MORE MTK69 1 61 THAN 5 PERCENT. MTK69 1 62 ERR-ANALYS THE ERRORS WERE ESTIMATED TO EQUAL ABOUT 20 PERCENT. MTK69 1 63 FEW DETAILS ON THE ERROR ANALYSIS ARE GIVEN IN THE MTK69 1 64 ORIGINAL PAPER. MTK69 1 65 ENDBIB 63 MTK69 1 66 ENDSUBENT 1 MTK69 199999 SUBENT MTK69 2 0 MTK69 2 1 BIB 2 9 MTK69 2 2 REACTION 31P(P,GAMMA-0)32S MTK69 2 3 COMMENTS RESULTS FROM THREE INDEPENDENT CROSS-SECTION MTK69 2 4 MEASUREMENTS ARE GIVEN. DATA ARE OBTAINED FROM MTK69 2 5 TABLE 1 OF THE ORIGINAL PAPER. RUN = RUN NUMBER MTK69 2 6 AS DISCUSSED ABOVE. TARGET = TARGET THICKNESS. MTK69 2 7 EP = PROTON ENERGY. SIG = ABSOLUTE CROSS SECTION MTK69 2 8 FOR 31P(P,GAMMA-0)32S REACTION. SIG-ERR = ERROR IN MTK69 2 9 SIG. MCRG/CM2 = MICROGRAM/CM**2. MICROB = MICROBARN MTK69 2 10 = 10**(-24) BARN. MTK69 2 11 ENDBIB 9 MTK69 2 12 DATA 5 3 MTK69 2 13 RUN TARGET EP SIG SIG-ERR MTK69 2 14 NO-DIM MCRG/CM2 MEV MICROB MICROB MTK69 2 15 I 444. 9.72 36.1 7.2 MTK69 2 16 II 178. 11.24 56.5 11.3 MTK69 2 17 III 249. 10.38 54.4 10.9 MTK69 2 18 ENDDATA 5 MTK69 2 19 ENDSUBENT 2 MTK69 299999 ENDENTRY 2 MTK699999999