ENTRY I+91 0 I+91 0 1 SUBENT I+91 1 0 I+91 1 1 BIB 12 66 I+91 1 2 INSTITUTES (USANOT) I+91 1 3 (CANTOR) I+91 1 4 (CAN) RYERSON POLYTECHNICAL INSTITUTE I+91 1 5 (USACAL) I+91 1 6 REFERENCE (J,NP/A,533,153,1991) I+91 1 7 AUTHORS (C.ILIADIS,U.GIESEN,J.GOERRES,S.GRAFF,M.WIESCHER, I+91 1 8 R.E.AZUMA,J.KING,M.BUCKBY,C.A.BARNES,T.R.WANG) I+91 1 9 TITLE THE REACTION BRANCHING 31P(P,GAMMA)/31P(P,ALPHA) IN I+91 1 10 THE RP-PROCESS I+91 1 11 FACILITIES (VDG) 3-MV PELLETRON TANDEM ACCELERATOR, KELLOGG I+91 1 12 RADIATION LABORATORY, CALIFORNIA INSTITUTE OF I+91 1 13 TECHNOLOGY, PASADENA, CALIFORNIA. I+91 1 14 (VDG) 1-MV VAN DE GRAAFF ACCELERATOR, UNIVERSITY OF I+91 1 15 TORONTO, TORONTO, ONTARIO, CANADA. I+91 1 16 (C-W) 350-KV COCKROFT-WALTON ACCELERATOR, UNIVERSITY I+91 1 17 OF TOLEDO, TOLEDO, OHIO. I+91 1 18 INC-PART (P) PROTONS. I+91 1 19 TARGETS TARGETS WERE PRODUCED BY ION IMPLANTATION USING THE I+91 1 20 1-KV COCKROFT-WALTON ACCELERATOR. 31P IONS WERE I+91 1 21 IMPLANTED INTO A 0.5-MM THICK TANTALUM BACKING. THE I+91 1 22 IMPLANTATION ENERGY WAS 200 KEV AND THE INCIDENT I+91 1 23 DOSE WAS 133 MICROAMPERE-HOURS. THE 31P BEAM WAS I+91 1 24 SCANNED OVER AN AREA OF 1.5 CM**2 TO INSURE I+91 1 25 HOMOGENEOUS IMPLANTATION OVER THE ENTIRE AREA. I+91 1 26 METHOD THE 31P TARGETS PREPARED BY ION IMPLANTATION WERE I+91 1 27 FOUND TO HAVE WELL-DEFINED THICKNESS OF ABOUT 15 I+91 1 28 KEV AT 355 KEV PROTON BOMBARDING ENERGY. THE TARGET I+91 1 29 THICKNESS AND STOICHIOMETRY, TA2P3, WERE DETERMINED I+91 1 30 BY MEASURING THE THICK-TARGET YIELD CURVE OF THE I+91 1 31 WELL KNOWN RESONANCE AT EP = 811 KEV IN THE REACTION I+91 1 32 31P(P,GAMMA)32S. THE TARGETS WERE DIRECTLY WATER I+91 1 33 COOLED AND PROVED TO BE VERY STABLE UNDER PROTON I+91 1 34 BOMBARDMENT. MEASUREMENTS ON 31P(P,GAMMA)32S OVER I+91 1 35 THE RANGE EP = 0.35 TO 0.62 WERE CARRIED OUT AT I+91 1 36 THE CAL TECH PELLETRON FACILITY. BEAM CURRENTS UP I+91 1 37 TO 100 MICROAMPERES WERE USED. THE RESOLUTION WAS I+91 1 38 1 KEV AS MEASURED USING THE NARROW RESONANCE AT I+91 1 39 EP = 991.88 KEV IN 27AL(P,GAMMA)28SI. THE PROTON I+91 1 40 ENERGY WAS CALIBRATED USING THE EP = 811 KEV I+91 1 41 RESONANCE IN 31P(P,GAMMA)32S. MEASUREMENTS IN THE I+91 1 42 RANGE EP = 0.28 TO 0.45 MEV WERE CONDUCTED AT THE I+91 1 43 TORONTO VAN DE GRAAFF FACILITY. PROTON BEAM CURRENTS I+91 1 44 UP TO 50 MICROAMPERES WERE USED. THE RESOLUTION WAS I+91 1 45 1 KEV AND THE ENERGY CALIBRATION WAS KNOWN TO BETTER I+91 1 46 THAN 2 KEV. THE EXPERIMENTAL SETUPS WERE SIMILAR IN I+91 1 47 BOTH LABORATORIES. TARGETS WERE MOUNTED AT 45 I+91 1 48 DEGREES RELATIVE TO THE INCIDENT PROTON BEAM. A I+91 1 49 TANTALUM COLLIMATOR WAS USED TO DEFINE THE PROTON I+91 1 50 BEAM. A LIQUID-NITROGEN COOLED COPPER TUBE WAS I+91 1 51 PLACED BETWEEN THIS COLLIMATOR AND THE TARGET TO I+91 1 52 INHIBIT CARBON DEPOSITION ON THE TARGET. THE I+91 1 53 COOLED COPPER TUBE WAS BIASED AT -200 VOLTS TO I+91 1 54 SUPPRESS SECONDARY ELECTRON EMISSION FROM THE TARGET. I+91 1 55 GAMMA-RAYS WERE MEASURED WITH A GE(LI) DETECTOR IN I+91 1 56 CLOSE GEOMETRY AT 55 DEGREES RELATIVE TO THE INCIDENT I+91 1 57 PROTON BEAM. THE DETECTOR WAS SHIELDED WITH LEAD TO I+91 1 58 MINIMIZE BACKGROUND. THE GAMMA-RAY EFFICIENCY OF THIS I+91 1 59 DETECTOR WAS MEASURED USING THE WELL-KNOWN BRANCHING I+91 1 60 RATIOS FOR THE GAMMA-RAYS FROM THE 632- AND 992-KEV I+91 1 61 RESONANCES IN 27AL(P,GAMMA)28SI. I+91 1 62 DETECTOR (GELI) 35-CM**3 GE(LI) DETECTOR. I+91 1 63 MONITOR (CI) CURRENT INTEGRATOR. I+91 1 64 CORRECTION DATA WERE CORRECTED FOR DETECTOR EFFICIENCY AND I+91 1 65 GAMMA RAY ABSORPTION. SEE ORIGINAL PAPER FOR DETAILS. I+91 1 66 ERR-ANALYS ERRORS ARE GIVEN BUT FEW DETAILS ON THE ERROR ANALYSIS I+91 1 67 PROCEDURES ARE PROVIDED. I+91 1 68 ENDBIB 66 I+91 1 69 ENDSUBENT 1 I+91 199999 SUBENT I+91 2 0 I+91 2 1 BIB 2 6 I+91 2 2 REACTION 31P(P,GAMMA)32S I+91 2 3 COMMENTS RESONANCE ENERGIES FOR THE OBSERVED PROTON UNBOUND I+91 2 4 LEVELS IN 32S ARE GIVEN. DATA OBTAINED FROM TABLE 1 I+91 2 5 OF THE ORIGINAL PAPER. EP = RESONANCE PROTON ENERGY. I+91 2 6 EP-ERR = ERROR IN PROTON ENERGY. EX = RESONANCE I+91 2 7 EXCITATION ENERGY IN 32S. I+91 2 8 ENDBIB 6 I+91 2 9 DATA 3 6 I+91 2 10 EP EP-ERR EX I+91 2 11 KEV KEV MEV I+91 2 12 355. 1. 9.208 I+91 2 13 383. 2. 9.236 I+91 2 14 403. 2. 9.255 I+91 2 15 439. 1. 9.290 I+91 2 16 541. 1. 9.389 I+91 2 17 619. 1. 9.464 I+91 2 18 ENDDATA 8 I+91 2 19 ENDSUBENT 2 I+91 299999 SUBENT I+91 3 0 I+91 3 1 BIB 2 13 I+91 3 2 REACTION 31P(P,GAMMA)32S I+91 3 3 COMMENTS GAMMA-RAY BRANCHING IN THE DECAY OF OBSERVED I+91 3 4 RESONANCES IN 31P(P,GAMMA)32S. EP = RESONANCE I+91 3 5 PROTON ENERGY. EX = RESONANCE EXCITATION ENERGY I+91 3 6 IN 32S. EI = INITIAL STATE OF GAMMA-RAY TRANSITION. I+91 3 7 EF = FINAL STATE OF TRANSITION. J-PI(R) = SPIN/PARITY I+91 3 8 OF RESONANCE STATE. J-PI(F) = SPIN/PARITY OF FINAL I+91 3 9 STATE OF GAMMA-RAY TRANSITION. A NEGATIVE VALUE MEANS I+91 3 10 NEGATIVE PARITY. OTHERWISE PARITY IS POSITIVE. B = I+91 3 11 GAMMA-RAY BRANCHING RATIO. B-ERR = ERROR IN B. PCT = I+91 3 12 PERCENT. A BLANK SPACE INDICATES THAT NO VALUE WAS I+91 3 13 PROVIDED IN THE ORIGINAL PAPER. DATA OBTAINED FROM I+91 3 14 TABLE 2 OF THE ORIGINAL PAPER. I+91 3 15 ENDBIB 13 I+91 3 16 DATA 8 43 I+91 3 17 EP EX EI J-PI(R) EF J-PI(F) I+91 3 18 B B-ERR I+91 3 19 KEV MEV MEV NO-DIM MEV NO-DIM I+91 3 20 PCT PCT I+91 3 21 355. 9.208 9.208 1. 7.190 1. I+91 3 22 2.8 0.7 I+91 3 23 355. 9.208 9.208 1. 6.224 -2. I+91 3 24 9.1 0.8 I+91 3 25 355. 9.208 9.208 1. 5.798 -1. I+91 3 26 6.2 1.2 I+91 3 27 355. 9.208 9.208 1. 5.549 2. I+91 3 28 7.1 1.1 I+91 3 29 355. 9.208 9.208 1. 4.282 2. I+91 3 30 2.1 0.6 I+91 3 31 355. 9.208 9.208 1. 3.778 0. I+91 3 32 4.1 0.6 I+91 3 33 355. 9.208 9.208 1. 2.230 2. I+91 3 34 34.1 2.0 I+91 3 35 355. 9.208 9.208 1. 0. 0. I+91 3 36 34.5 2.0 I+91 3 37 383. 9.236 9.236 -1. 4.695 1. I+91 3 38 17.0 7.9 I+91 3 39 383. 9.236 9.236 -1. 3.778 0. I+91 3 40 46.6 11.9 I+91 3 41 383. 9.236 9.236 -1. 2.230 2. I+91 3 42 36.4 8.7 I+91 3 43 403. 9.255 9.255 2. 6.666 I+91 3 44 8.9 1.6 I+91 3 45 403. 9.255 9.255 2. 6.224 -2. I+91 3 46 6.0 1.1 I+91 3 47 403. 9.255 9.255 2. 5.549 2. I+91 3 48 4.3 1.3 I+91 3 49 403. 9.255 9.255 2. 5.413 3. I+91 3 50 5.2 1.4 I+91 3 51 403. 9.255 9.255 2. 5.006 -3. I+91 3 52 14.0 2.1 I+91 3 53 403. 9.255 9.255 2. 4.695 1. I+91 3 54 24.5 2.3 I+91 3 55 403. 9.255 9.255 2. 4.282 2. I+91 3 56 5.6 1.3 I+91 3 57 403. 9.255 9.255 2. 2.230 2. I+91 3 58 31.5 3.0 I+91 3 59 439. 9.290 9.290 1. 7.536 0. I+91 3 60 5.6 0.5 I+91 3 61 439. 9.290 9.290 1. 7.115 2. I+91 3 62 15.6 0.9 I+91 3 63 439. 9.290 9.290 1. 7.003 1. I+91 3 64 1.0 0.2 I+91 3 65 439. 9.290 9.290 1. 6.224 -2. I+91 3 66 2.5 0.3 I+91 3 67 439. 9.290 9.290 1. 5.798 -1. I+91 3 68 1.1 0.2 I+91 3 69 439. 9.290 9.290 1. 4.695 1. I+91 3 70 15.6 0.9 I+91 3 71 439. 9.290 9.290 1. 2.230 2. I+91 3 72 18.7 0.9 I+91 3 73 439. 9.290 9.290 1. 0. 0. I+91 3 74 39.9 1.7 I+91 3 75 541. 9.389 9.389 -2. 8.126 1. I+91 3 76 1.3 0.1 I+91 3 77 541. 9.389 9.389 -2. 6.621 -4. I+91 3 78 1.5 0.9 I+91 3 79 541. 9.389 9.389 -2. 6.224 -2. I+91 3 80 15.9 0.7 I+91 3 81 541. 9.389 9.389 -2. 5.798 -1. I+91 3 82 1.9 0.3 I+91 3 83 541. 9.389 9.389 -2. 5.549 2. I+91 3 84 1.7 0.3 I+91 3 85 541. 9.389 9.389 -2. 5.413 3. I+91 3 86 0.9 0.1 I+91 3 87 541. 9.389 9.389 -2. 5.006 -3. I+91 3 88 7.8 0.4 I+91 3 89 541. 9.389 9.389 -2. 4.695 1. I+91 3 90 2.0 0.2 I+91 3 91 541. 9.389 9.389 -2. 4.282 2. I+91 3 92 1.9 0.2 I+91 3 93 541. 9.389 9.389 -2. 2.230 2. I+91 3 94 62.6 2.3 I+91 3 95 541. 9.389 9.389 -2. 0. 0. I+91 3 96 2.5 0.1 I+91 3 97 619. 9.464 9.464 2. 7.115 2. I+91 3 98 5.4 1.5 I+91 3 99 619. 9.464 9.464 2. 4.695 1. I+91 3 100 21.2 3.1 I+91 3 101 619. 9.464 9.464 2. 3.778 0. I+91 3 102 4.7 1.3 I+91 3 103 619. 9.464 9.464 2. 2.230 2. I+91 3 104 26.5 3.3 I+91 3 105 619. 9.464 9.464 2. 0. 0. I+91 3 106 42.2 3.4 I+91 3 107 ENDDATA 90 I+91 3 108 ENDSUBENT 3 I+91 399999 SUBENT I+91 4 0 I+91 4 1 BIB 2 13 I+91 4 2 REACTION 31P(P,GAMMA)32S I+91 4 3 COMMENTS EXPERIMENTALLY DETERMINED RESONANCE STRENGTHS FOR I+91 4 4 THE REACTION 31P(P,GAMMA)32S ARE GIVEN. DATA OBTAINED I+91 4 5 FROM TABLE 3 OF THE ORIGINAL PAPER. EP = PROTON I+91 4 6 ENERGY OF THE RESONANCE. J-PI = SPIN/PARITY OF THE I+91 4 7 RESONANCE. A NEGATIVE SIGN INDICATES NEGATIVE PARITY. I+91 4 8 OTHERWISE PARITY IS POSITIVE. S = RESONANCE STRENGTH = I+91 4 9 [(2J+1)/(2JP+1)*(2JT+1)]*GAMMA(P)*GAMMA(G)/GAMMA(TOT), I+91 4 10 WHERE J = RESONANCE SPIN, JP = PROTON SPIN = 0.5, JT = I+91 4 11 TARGET (31P) SPIN = 0.5, GAMMA(P) = PROTON WIDTH, I+91 4 12 GAMMA(G) = GAMMA-RAY WIDTH, AND GAMMA(TOT) = TOTAL I+91 4 13 WIDTH OF THE RESONANCE. S-ERR = ERROR IN S. A BLANK I+91 4 14 SPACE INDICATES VALUE NOT GIVEN IN THE TABLE. I+91 4 15 ENDBIB 13 I+91 4 16 DATA 4 8 I+91 4 17 EP J-PI S S-ERR I+91 4 18 KEV NO-DIM EV EV I+91 4 19 316. 3. 3.7000E-05 I+91 4 20 342. 2. 6.1000E-05 I+91 4 21 355. 1. 0.0042 0.0007 I+91 4 22 383. -1. 6.0000E-05 1.2000E-05 I+91 4 23 403. 2. 4.5000E-04 7.0000E-05 I+91 4 24 439. 1. 0.025 0.004 I+91 4 25 541. -2. 0.12 0.02 I+91 4 26 619. 2. 0.0011 0.0002 I+91 4 27 ENDDATA 10 I+91 4 28 ENDSUBENT 4 I+91 499999 SUBENT I+91 5 0 I+91 5 1 BIB 2 15 I+91 5 2 REACTION 31P(P,GAMMA)32S I+91 5 3 COMMENTS CALCULATED RESONANCE STRENGTHS FOR POSSIBLE LOW- I+91 5 4 ENERGY UNOBSERVED RESONANCES IN 31P(P,GAMMA)32S. I+91 5 5 EP = RESONANCE PROTON ENERGY. EX = RESONANCE I+91 5 6 EXCITATION ENERGY IN 32S. J=PI = RESONANCE SPIN/ I+91 5 7 PARITY. A NEGATIVE VALUE INDICATES NEGATIVE PARITY. I+91 5 8 OTHERWISE PARITY IS POSITIVE. GAMMA(P) = PROTON I+91 5 9 WIDTH. GAMMA(G) = GAMMA-RAY WIDTH. S IS THE RESONANCE I+91 5 10 STRENGTH CALCULATED AS DISCUSSED IN THE PAPER. S = I+91 5 11 [(2J+1)/(2JP+1)*(2JT+1)]*GAMMA(P)*GAMMA(G)/GAMMA(TOT), I+91 5 12 WHERE J = RESONANCE SPIN, JP = PROTON SPIN = 0.5, JT = I+91 5 13 TARGET (31P) SPIN = 0.5, GAMMA(P) = PROTON WIDTH, I+91 5 14 GAMMA(G) = GAMMA-RAY WIDTH, AND GAMMA(TOT) = TOTAL I+91 5 15 WIDTH OF THE RESONANCE. A BLANK SPACE INDICATES I+91 5 16 VALUE NOT GIVEN IN THE TABLE OR IS UNCERTAIN. I+91 5 17 ENDBIB 15 I+91 5 18 DATA 6 3 I+91 5 19 EP EX J-PI GAMMA(P) GAMMA(G) S I+91 5 20 KEV MEV NO-DIM EV EV EV I+91 5 21 163. 9.023 -3. 5.5000E-11 0.016 5.6000E-11 I+91 5 22 201. 9.060 2.8000E-06 I+91 5 23 206. 9.065 4. 7.0000E-11 0.005 1.0000E-10 I+91 5 24 ENDDATA 5 I+91 5 25 ENDSUBENT 5 I+91 599999 ENDENTRY 5 I+919999999