ENTRY RDS77 0 RDS77 0 1 SUBENT RDS77 1 0 RDS77 1 1 BIB 12 46 RDS77 1 2 INSTITUTE (CANOTC) RDS77 1 3 REFERENCE (J,NP/A,281,345,1977) RDS77 1 4 AUTHORS (D.W.O.ROGERS,W.R.DIXON,R.S.STOREY) RDS77 1 5 TITLE A STUDY OF THE 28SI(ALPHA,GAMMA)32S RESONANCES BELOW RDS77 1 6 E-ALPHA = 3.83 MEV RDS77 1 7 FACILITY (VDG) NRC 4-MV VAN DE GRAAFF ACCELERATOR, NATIONAL RDS77 1 8 RESEARCH COUNCIL OF CANADA, OTTAWA, CANADA. RDS77 1 9 INC-PART (4HE) HELIUM-4 (ALPHA) PARTICLES. RDS77 1 10 TARGETS A SILICON CRYSTAL SOLDERED TO A WATER-COOLED COPPER RDS77 1 11 BACKING WAS USED FOR MOST OF THE MEASUREMENTS. THIS RDS77 1 12 TARGET WAS INFINITELY THICK AND CHEMICALLY VERY PURE. RDS77 1 13 MEASUREMENTS AT THE TWO HIGHEST-ENERGY RESONANCES RDS77 1 14 WERE PERFORMED USING SILICON TARGETS THAT WERE ONLY RDS77 1 15 10 KEV THICK TO 4-MEV ALPHA PARTICLES. RDS77 1 16 METHOD 4HE+ BEAM WITH CURRENTS IN THE RANGE 5 - 10 MICROAMP RDS77 1 17 WERE OBTAINED FROM THE NRC 4-MV VAN DE GRAAFF RDS77 1 18 ACCELERATOR. BACKGROUND GAMMA RAYS WERE DETERMINED RDS77 1 29 BY RECORDING SPECTRA AT ALPHA-PARTICLE ENERGIES JUST RDS77 1 20 ABOVE AND JUST BELOW THE RESONANCE BEING STUDIED. RDS77 1 21 THE TARGET WAS SUUROUNDED BY A SHROUD KEPT AT LIQUID RDS77 1 22 NITROGEN TEMPERATURES TO REDUCE CARBON BUILD UP. RDS77 1 23 THIS SHROUD WAS HELD AT -300 VDC TO INSURE PROPER RDS77 1 24 MEASUREMENT OF TARGET CURRENT. GAMMA-RAYS YIELDS RDS77 1 25 AS A FUNTION OF INCIDENT BEAM ENERGY WERE MEASURED RDS77 1 26 WITH A NAI DETECTOR PLACED AT 90 DEGREES. ELEVEN RDS77 1 27 RESONANCES WERE EVIDENT FROM STEPS IN THE MEASURED RDS77 1 28 EXCITATION FUNCTION. A GE(LI) DETECTOR WAS USED TO RDS77 1 29 COLLECT GAMMA-RAY SPECTRA AT NINE ALPHA-PARTICLE RDS77 1 30 ENERGIES. THIS DETECTOR WAS PLACED 4.2 CM AWAY FROM RDS77 1 31 THE TARGET. CALIBRATION OF THE MEASUREMENT SYSTEM RDS77 1 32 WAS ACCOMPLISHED BY USING THE 13C(P,GAMMA)14N RDS77 1 33 REACTION AT EP = 1.75 MEV TO GENERATE THE WELL- RDS77 1 34 KNOWN GAMMA-RAY LINE AT EG = 9168 KEV AND THE RDS77 1 35 28SI(ALPHA)GAMMA)32S REACTION AT E-ALPHA = 2.88 RDS77 1 36 MEV TO PRODUCE GAMMA-RAY LINES WHICH COULD BE RDS77 1 37 USED AS SECONDARY STANDARDS. ALL OF THE GAMMA-RAY RDS77 1 38 MEASUREMENTS WERE CARRIED OUT AT 55 DEGREES RELATIVE RDS77 1 39 TO THE INCIDENT PARTICLE BEAMS TO MINIMIZE ANGULAR RDS77 1 40 DISTRIBUTION EFFECTS. RDS77 1 41 DETECTOR (SCINT) 12.7-CM X 10.2-CM NAI CRYSTAL SCINTILLATION RDS77 1 42 DETECTOR. RDS77 1 43 (GELI) 14-PERCENT EFFICIENT GE(LI) DETECTOR. RDS77 1 44 MONITOR (CI) CURRENT INTEGRATOR. RDS77 1 45 CORRECTION DATA WERE CORRECTED FOR DOPPLER EFFECTS. RDS77 1 46 ERR-ANALYS ERRORS ARE GIVEN BUT DETAILS OF ERROR ANALYSIS ARE RDS77 1 47 VERY LIMITED IN THEORIGINAL PAPER. RDS77 1 48 ENDBIB 46 RDS77 1 49 ENDSUBENT 1 RDS77 199999 SUBENT RDS77 2 0 RDS77 2 1 BIB 2 5 RDS77 2 2 REACTION 28SI(ALPHA,GAMMA)32S RDS77 2 3 COMMENTS EXCITATION ENERGIES OF LEVELS IN 32S ARE GIVEN. RDS77 2 4 DATA OBTAINED FROM TABLE 1 OF THE ORIGINAL PAPER. RDS77 2 5 EX = EXCITATION ENERGY OF LEVEL IN 32S. EX-ERR = RDS77 2 6 ERROR IN EX. RDS77 2 7 ENDBIB 5 RDS77 2 8 DATA 2 11 RDS77 2 9 EX EX-ERR RDS77 2 10 KEV KEV RDS77 2 11 8494. 2. RDS77 2 12 8690. 2. RDS77 2 13 8861. 2. RDS77 2 14 9023. 2. RDS77 2 15 9065. 2. RDS77 2 16 9236. 2. RDS77 2 17 9466. 1.5 RDS77 2 18 9486. 2. RDS77 2 19 9712. 2. RDS77 2 20 10220. 2. RDS77 2 21 10285. 2. RDS77 2 22 ENDDATA 13 RDS77 2 23 ENDSUBENT 2 RDS77 299999 SUBENT RDS77 3 0 RDS77 3 1 BIB 2 13 RDS77 3 2 REACTION 28SI(ALPHA,GAMMA)32S RDS77 3 3 COMMENTS GAMMA-RAY BRANCHING RATIOS FOR THE DECAY OF EXCITED RDS77 3 4 STATES IN 32S ARE GIVEN. DATA OBTAINED FROM FIGURE 3 RDS77 3 5 OF THE ORIGINAL PAPER. E-ALPHA = ALPHA-PARTICLE RDS77 3 6 ENERGY FOR EXCITING THE RESONANCE. EX = EXCITATION RDS77 3 7 ENERGY OF THE RESONANT STATE IN 32S. EI = INITIAL RDS77 3 8 ENERGY FOR GAMMA-RAY TRANSITION. EF = FINAL ENERGY. RDS77 3 9 J-PI(I) = SPIN/PARITY OF INITIAL STATE. J-PI(F) = RDS77 3 10 SPIN/PARITY OF FINAL STATE. A NEGATIVE VALUE IMPLIES RDS77 3 11 NEGATIVE PARITY. OTHERWISE PARITY IS POSITIVE. B = RDS77 3 12 GAMMA-RAY TRANSITION BRANCHING FACTOR. B-ERR = ERROR RDS77 3 13 IN B. PCT = PERCENT. A BLANK ENTRY IMPLIES THAT THE RDS77 3 14 VALUE IS UNAVAILABLE FROM THE ORIGINAL PAPER. RDS77 3 15 ENDBIB 13 RDS77 3 16 DATA 8 44 RDS77 3 17 E-ALPHA EX EI J-PI(I) EF J-PI(F) RDS77 3 18 B B-ERR RDS77 3 19 MEV MEV MEV NO-DIM MEV NO-DIM RDS77 3 20 PCT PCT RDS77 3 21 3.81 10.29 10.29 -3. 0. 0. RDS77 3 22 1. RDS77 3 23 3.81 10.29 10.29 -3. 2.23 2. RDS77 3 24 6. 1. RDS77 3 25 3.81 10.29 10.29 -3. 4.46 4. RDS77 3 26 15. 2. RDS77 3 27 3.81 10.29 10.29 -3. 5.01 -3. RDS77 3 28 79. 2. RDS77 3 29 3.74 10.22 10.22 -3. 2.23 2. RDS77 3 30 11. 1. RDS77 3 31 3.74 10.22 10.22 -3. 4.46 4. RDS77 3 32 21. 2. RDS77 3 33 3.74 10.22 10.22 -3. 4.70 1. RDS77 3 34 2. RDS77 3 35 3.74 10.22 10.22 -3. 5.01 -3. RDS77 3 36 68. 2. RDS77 3 37 3.74 10.22 10.22 -3. 7.12 RDS77 3 38 2. RDS77 3 39 3.16 9.71 9.71 2. 0. 0. RDS77 3 40 9. 3. RDS77 3 41 3.16 9.71 9.71 2. 2.23 2. RDS77 3 42 57. 6. RDS77 3 43 3.16 9.71 9.71 2. 4.70 1. RDS77 3 44 34. 9. RDS77 3 45 2.90 9.49 9.49 -1. 0. 0. RDS77 3 46 81. 2. RDS77 3 47 2.90 9.49 9.49 -1. 2.23 2. RDS77 3 48 4. RDS77 3 49 2.90 9.49 9.49 -1. 3.78 0. RDS77 3 50 2. 1. RDS77 3 51 2.90 9.49 9.49 -1. 4.28 2. RDS77 3 52 10. 1. RDS77 3 53 2.90 9.49 9.49 -1. 5.01 -3. RDS77 3 54 5. 1. RDS77 3 55 2.90 9.49 9.49 -1. 7.12 RDS77 3 56 2. 1. RDS77 3 57 2.88 9.47 9.47 2. 0. 0. RDS77 3 58 34. 2. RDS77 3 59 2.88 9.47 9.47 2. 2.23 2. RDS77 3 60 26. 2. RDS77 3 61 2.88 9.47 9.47 2. 3.78 0. RDS77 3 62 5. 1. RDS77 3 63 2.88 9.47 9.47 2. 4.46 4. RDS77 3 64 4. 1. RDS77 3 65 2.88 9.47 9.47 2. 4.70 1. RDS77 3 66 20. 2. RDS77 3 67 2.88 9.47 9.47 2. 5.01 -3. RDS77 3 68 4. 1. RDS77 3 69 2.88 9.47 9.47 2. 5.79 RDS77 3 70 4. 1. RDS77 3 71 2.88 9.47 9.47 2. 5.55 RDS77 3 72 4. 1. RDS77 3 73 2.61 9.24 9.24 -1. 0. 0. RDS77 3 74 1.9 0.6 RDS77 3 75 2.61 9.24 9.24 -1. 2.23 2. RDS77 3 76 58. 2. RDS77 3 77 2.61 9.24 9.24 -1. 3.78 0. RDS77 3 78 30. 2. RDS77 3 79 2.61 9.24 9.24 -1. 4.70 1. RDS77 3 80 11. 2. RDS77 3 81 2.42 9.07 9.07 4.28 2. RDS77 3 82 17. 3. RDS77 3 83 2.42 9.07 9.07 4.46 4. RDS77 3 84 41. 2. RDS77 3 85 2.42 9.07 9.07 5.41 RDS77 3 86 43. 2. RDS77 3 87 2.37 9.02 9.02 2.23 2. RDS77 3 88 61. 2. RDS77 3 89 2.37 9.02 9.02 4.28 2. RDS77 3 90 20. 2. RDS77 3 91 2.37 9.02 9.02 5.01 -3. RDS77 3 92 19. 2. RDS77 3 93 2.19 8.86 8.86 2. 0. 0. RDS77 3 94 52. 5. RDS77 3 95 2.19 8.86 8.86 2. 2.23 2. RDS77 3 96 34. 4. RDS77 3 97 2.19 8.86 8.86 2. 3.78 0. RDS77 3 98 14. 4. RDS77 3 99 1.99 8.69 8.69 2. 0. 0. RDS77 3 100 32. 4. RDS77 3 101 1.99 8.69 8.69 2. 2.23 2. RDS77 3 102 56. 5. RDS77 3 103 1.99 8.69 8.69 2. 3.78 0. RDS77 3 104 12. 4. RDS77 3 105 1.77 8.50 8.50 -1. 0. 0. RDS77 3 106 62. 5. RDS77 3 107 1.77 8.50 8.50 -1. 2.23 2. RDS77 3 108 38. 5. RDS77 3 109 ENDDATA 92 RDS77 3 110 ENDSUBENT 3 RDS77 399999 SUBENT RDS77 4 0 RDS77 4 1 BIB 2 20 RDS77 4 2 REACTIONS 31P(P,GAMMA)32S RDS77 4 3 31P(P,ALPHA)28SI RDS77 4 4 28SI(ALPHA,GAMMA)32S RDS77 4 5 COMMENTS PARTICLE AND GAMMA-RAY WIDTHS FOR STATES IN 32S ARE RDS77 4 6 GIVEN. DATA TAKEN FROM TABLE 4 OF THE ORIGINAL PAPER. RDS77 4 7 EX = EXCITATION ENERGY IN 32S. J-PI = SPIN/PARITY OF RDS77 4 8 STATE IN 32S. A NEGATIVE VALUE IMPLIES NEGATIVE RDS77 4 9 PARITY. OTHERWISE PARITY IS POSITIVE. GAM(G) = GAMMA- RDS77 4 10 RAY WIDTH. GAM(G)-ERR = ERROR IN GAM(G). GAM(P) = RDS77 4 11 PROTON WIDTH. GAM(P)-ERR = ERROR IN GAM(P). GAM(A) = RDS77 4 12 ALPHA-PARTICLE WIDTH. GAM(A)-ERR = ERROR IN GAM(A). RDS77 4 13 SPG = (2J+1)*GAM(P)*GAM(G)/GAM(T), WHERE J = SPIN RDS77 4 14 OF THE RESONANCE AND GAM(T) = TOTAL RESONANCE WIDTH. RDS77 4 15 SAG = (2J+1)*GAM(A)*GAM(G)/GAM(T). SPA0 = RDS77 4 16 (2J+1)*GAM(P)*GAM(A0)/GAM(T), WHERE GAM(A0) = WIDTH RDS77 4 17 FOR DECAY OF THE STATE IN 32S BY AN ALPHA-PARTICLE RDS77 4 18 TRANSITION TO 28SI GROUND STATE. SPG-ERR, SAG-ERR, AND RDS77 4 19 SPA0-ERR ARE THE ERRORS IN THE RESPECTIVE STRENGTHS. RDS77 4 20 MILLIEV = 10**(-3) EV. BLANK ENTRIES INDICATE THAT RDS77 4 21 VALUES ARE NOT AVAILABLE IN THE ORIGINAL PAPER. RDS77 4 22 ENDBIB 20 RDS77 4 23 DATA 14 11 RDS77 4 24 EX J-PI SAG SAG-ERR SPG SPG-ERR RDS77 4 25 SPA0 SPA0-ERR GAM(G) GAM(G)-ERR GAM(A) GAM(A)-ERR RDS77 4 26 GAM(P) GAM(P)-ERR RDS77 4 27 MEV NO-DIM MILLIEV MILLIEV MILLIEV MILLIEV RDS77 4 28 MILLIEV MILLIEV MILLIEV MILLIEV MILLIEV MILLIEV RDS77 4 29 MILLIEV MILLIEV RDS77 4 30 8.50 -1. 16. 3. RDS77 4 31 5.3 5.3 RDS77 4 32 RDS77 4 33 8.69 2. 12. 2.4 RDS77 4 34 2.4 2.4 RDS77 4 35 RDS77 4 36 8.86 2. 16. 3. RDS77 4 37 3.2 0.7 3.2 RDS77 4 38 RDS77 4 39 9.02 52. 10. RDS77 4 40 RDS77 4 41 RDS77 4 42 9.07 64. 13. RDS77 4 43 RDS77 4 44 RDS77 4 45 9.24 -1. 540. 100. 0.15 RDS77 4 46 30. 180. 36. 180. RDS77 4 47 10. RDS77 4 48 9.47 2. 720. 150. 60. 18. RDS77 4 49 100. 35. 242. 52. 400. 120. RDS77 4 50 34. 8. RDS77 4 51 9.49 -1. 830. 170. 520. 80. RDS77 4 52 5400. 1600. 480. 60. 4900. 1200. RDS77 4 53 3100. 700. RDS77 4 54 9.71 2. 630. 130. 290. 90. RDS77 4 55 183. 125. RDS77 4 56 58. RDS77 4 57 10.22 -3. 8100. 1600. 4300. 900. RDS77 4 58 90000. 17000. 1800. 300. 38000. 9000. RDS77 4 59 20000. 4000. RDS77 4 60 10.29 -3. 2300. 400. 210. 60. RDS77 4 61 48000. 10000. 360. 70. 83000. 32000. RDS77 4 62 7600. 1400. RDS77 4 63 ENDDATA 39 RDS77 4 64 ENDSUBENT 4 RDS77 499999 ENDENTRY 4 RDS779999999