ENTRY O1718 20160730 O058O171800000001 SUBENT O1718001 20160730 O058O171800100001 BIB 9 24 O171800100002 TITLE Measurement of the Mg-24(He3,p)Al-26 cross section: O171800100003 Implication for Al-26 production in the early solar O171800100004 system. O171800100005 REFERENCE (J,PR/C,78,044613,2008) O171800100006 AUTHOR (C.Fitoussi,J.Duprat,V.Tatischeff,J.Kiener,F.Naulin, O171800100007 G.Raisbeck, M.Assuncao, C.Bourgeois, M.Chabot, A.Coc, O171800100008 C.Engrand, M.Gounelle, F.Hammache, A.Lefebvre, O171800100009 M.-G.Porquet, J.-A.Scarpaci, N.de Sereville, O171800100010 J.-P.Thibaud, F.Yiou) O171800100011 INSTITUTE (2FR CSN) O171800100012 (2FR PAR) O171800100013 FACILITY (VDGT,2FR CSN) The 14-MV tandem accelerator of IPN- O171800100014 Orsay. O171800100015 METHOD (BCINT) O171800100016 COMMENT *By authors* A direct measurement of the Al-26 O171800100017 production on Mg target by means of gamma-ray O171800100018 spectroscopy and accelerator mass spectrometry were O171800100019 performed. O171800100020 DECAY-DATA (13-AL-26-G,720000.YR) O171800100021 HISTORY (20081208C) S.B O171800100022 (20160730A) SD: REACTION code corrected in Subent 003. O171800100023 ANALYSIS, ERR-ANALYS update. SAMPLE, DETECTOR moved to O171800100024 Subents 002-004. Small corrections in all Subents. O171800100025 METHOD was added. FACILITY 'VDGT' moved to Subent 001. O171800100026 ENDBIB 24 0 O171800100027 NOCOMMON 0 0 O171800100028 ENDSUBENT 27 0 O171800199999 SUBENT O1718002 20160730 O058O171800200001 BIB 11 38 O171800200002 REACTION (12-MG-24(HE3,P)13-AL-26,PAR,SIG,G) O171800200003 METHOD (GSPEC) O171800200004 ANALYSIS (INTAD) The angular dependence of the 417 keV line wasO171800200005 fitted as Legendre polynomial and the attenuation O171800200006 coefficients which have been analytically calculated O171800200007 from the experimental setup geometry (see A.J.Ferguson,O171800200008 'Angular Correlation Methods in Gamma-Ray O171800200009 Spectroscopy' (North-Holland, Amsterdam, 1965)). O171800200010 The total cr.section is given as 4 x Pi x A0. O171800200011 Data were measured at 90, 112.5, 135 and 157.5 deg. O171800200012 SAMPLE Self-supported Mg-24 targets were used. The thicknessesO171800200013 of the targets ranged from 0.5 to 17.7 mg/cm2 O171800200014 All Mg-24 targets were enriched more than 99%. O171800200015 DETECTOR (HPGE,BGO) The gamma rays were detected with four largeO171800200016 volume HP-Ge detectors. The Ge crystals were surroundedO171800200017 by bismuth germinate(BGO) detectors for Compton O171800200018 suppression. O171800200019 The detectors efficiencies were determined using O171800200020 calibrated radioactive sources (60Co,88Y,137Cs,152Eu) O171800200021 and proton-induced reactions for which gamma-productionO171800200022 cross sections are known: O171800200023 24Mg(p,p')24Mg (Egamma = 1.37 MeV) and 16O(p,p')16O O171800200024 (Egamma = 2.74 and 6.13 MeV). O171800200025 ERR-ANALYS (ERR-1) uncertainty of the target thickness 10%, O171800200026 (ERR-2) uncertainty of the Q-value 5%, O171800200027 (ERR-3) uncertainty of the dead time correction 3%. O171800200028 (EN-ERR) uncertainty of the effective energy for the O171800200029 cross section measurement O171800200030 (ERR-T) Total error O171800200031 EN-SEC (E,G) O171800200032 MISC-COL (MISC) Thickness of the target O171800200033 CORRECTION The dead-time-correction. The dead time was found to O171800200034 range from 15% to 40% for the thin target(5mg/cm**2) O171800200035 and from 50% to 60% for the thicker targets. O171800200036 STATUS (TABLE) Table 1 of PR/C,78,044613,2008 O171800200037 HISTORY (20160730A) SD: THICKNESS -> MISC (THICKNESS is not an O171800200038 independent variable of cross section). O171800200039 SF4=Al-26g -> Al-26 in REACTION code. O171800200040 ENDBIB 38 0 O171800200041 COMMON 4 3 O171800200042 E ERR-1 ERR-2 ERR-3 O171800200043 KEV PER-CENT PER-CENT PER-CENT O171800200044 417. 10. 5. 3. O171800200045 ENDCOMMON 3 0 O171800200046 DATA 5 46 O171800200047 EN EN-ERR DATA ERR-T MISC O171800200048 MEV MEV MB MB G/CM-SQ O171800200049 3.1 0.6 4.4 0.4 0.00188 O171800200050 3.5 0.2 6.9 0.7 0.00056 O171800200051 3.8 0.2 14. 1. 0.00056 O171800200052 4.1 0.2 24. 2. 0.00056 O171800200053 4.3 0.2 35. 3. 0.00056 O171800200054 4.6 0.2 43. 4. 0.00056 O171800200055 4.9 0.2 57. 6. 0.00056 O171800200056 5.1 0.1 59. 6. 0.00056 O171800200057 5.4 0.1 68. 7. 0.00056 O171800200058 5.6 0.1 85. 8. 0.00056 O171800200059 5.9 0.1 87. 8. 0.00050 O171800200060 6.1 0.1 93. 9. 0.00056 O171800200061 6.4 0.1 100. 10. 0.00056 O171800200062 6.6 0.1 101. 10. 0.00056 O171800200063 6.9 0.1 93. 9. 0.00188 O171800200064 7.1 0.1 95. 9. 0.00056 O171800200065 7.4 0.1 100. 10. 0.00056 O171800200066 7.6 0.6 91. 9. 0.00340 O171800200067 7.6 0.1 96. 9. 0.00056 O171800200068 7.9 0.4 97. 9. 0.00188 O171800200069 8.2 0.1 92. 9. 0.00056 O171800200070 8.4 0.1 91. 9. 0.00056 O171800200071 8.7 0.3 79. 8. 0.00188 O171800200072 8.7 0.1 88. 9. 0.00056 O171800200073 8.9 0.7 76. 7. 0.00412 O171800200074 9.2 0.1 77. 7. 0.00056 O171800200075 9.4 0.3 72. 7. 0.00188 O171800200076 9.4 0.1 74. 7. 0.00056 O171800200077 9.7 0.1 69. 7. 0.00056 O171800200078 10.2 0.6 56. 5. 0.00393 O171800200079 10.2 0.1 65. 6. 0.00056 O171800200080 10.4 0.4 53. 5. 0.00238 O171800200081 11.2 0.4 49. 5. 0.00238 O171800200082 11.7 0.3 45. 4. 0.00238 O171800200083 11.9 0.6 36. 3. 0.00427 O171800200084 12.2 0.3 44. 4. 0.00238 O171800200085 12.7 0.3 42. 4. 0.00238 O171800200086 13.2 0.3 38. 4. 0.00238 O171800200087 13.7 0.3 34. 3. 0.00238 O171800200088 14.2 0.3 27. 3. 0.00238 O171800200089 14.3 0.7 14. 1. 0.00577 O171800200090 14.7 0.3 26. 3. 0.00238 O171800200091 19.8 0.2 10. 1. 0.00238 O171800200092 24.8 0.2 4.9 0.5 0.00238 O171800200093 29.8 0.2 3.9 0.4 0.00238 O171800200094 35.9 0.2 1.7 0.2 0.00238 O171800200095 ENDDATA 48 0 O171800200096 ENDSUBENT 95 0 O171800299999 SUBENT O1718003 20160730 O058O171800300001 BIB 11 44 O171800300002 REACTION ((12-MG-24(HE3,P)13-AL-26,PAR,SIG,G)+ O171800300003 (12-MG-25(HE3,X)13-AL-26,PAR,SIG,G,RAB)+ O171800300004 (12-MG-26(HE3,X)13-AL-26,PAR,SIG,G,RAB)) O171800300005 METHOD (GSPEC) O171800300006 ANALYSIS (INTAD) The angular dependence of the 417 keV line wasO171800300007 fitted as Legendre polynomial and the attenuation O171800300008 coefficients which have been analytically calculated O171800300009 from the experimental setup geometry (see A.J.Ferguson,O171800300010 'Angular Correlation Methods in Gamma-Ray O171800300011 Spectroscopy' (North-Holland, Amsterdam, 1965)). O171800300012 The total cr.section is given as 4 x Pi x a0. O171800300013 Data were measured at 90, 112.5, 135 and 157.5 deg. O171800300014 SAMPLE (12-MG-24,NAT=0.7899) O171800300015 (12-MG-25,NAT=0.10) O171800300016 (12-MG-26,NAT=0.1101) O171800300017 Self-supported natMg targets were used. The thicknessesO171800300018 of the targets ranged from 0.5 to 17.7 mg/cm2 O171800300019 DETECTOR (HPGE,BGO) The gamma rays were detected with four largeO171800300020 volume HP-Ge detectors. The Ge crystals were surroundedO171800300021 by bismuth germinate(BGO) detectors for Compton O171800300022 suppression. O171800300023 The detectors efficiencies were determined using O171800300024 calibrated radioactive sources (60Co,88Y,137Cs,152Eu) O171800300025 and proton-induced reactions for which gamma-productionO171800300026 cross sections are known: O171800300027 24Mg(p,p')24Mg (Egamma = 1.37 MeV) and 16O(p,p')16O O171800300028 (Egamma = 2.74 and 6.13 MeV). O171800300029 ERR-ANALYS (ERR-1) uncertainty of the target thickness 10%, O171800300030 (ERR-2) uncertainty of the Q-value 5%, O171800300031 (ERR-3) uncertainty of the dead time correction 3%. O171800300032 (EN-ERR) uncertainty of the effective energy for the O171800300033 cross section measurement O171800300034 (ERR-T) Total error O171800300035 EN-SEC (E,G) O171800300036 MISC-COL (MISC) Thickness of the target O171800300037 CORRECTION The dead-time-correction. The dead time was found to O171800300038 range from 15% to 40% for the thin target(5mg/cm**2) O171800300039 and from 50% to 60% for the thicker targets. O171800300040 STATUS (TABLE) Table 2 of PR/C,78,044613,2008 O171800300041 HISTORY (20160730A) SD: REACTION code changed (one reaction -> O171800300042 sum of reactions). ANALYSIS, ERR-ANALYS update. O171800300043 DATA-ERR -> ERR-T. THICKNESS -> MISC (THICKNESS is not O171800300044 an independent variable of cross section). O171800300045 SF4=Al-26g -> Al-26 in REACTION code. O171800300046 ENDBIB 44 0 O171800300047 COMMON 4 3 O171800300048 E ERR-1 ERR-2 ERR-3 O171800300049 KEV PER-CENT PER-CENT PER-CENT O171800300050 417. 10. 5. 3. O171800300051 ENDCOMMON 3 0 O171800300052 DATA 5 36 O171800300053 EN EN-ERR DATA ERR-T MISC O171800300054 MEV MEV MB MB G/CM-SQ O171800300055 3.6 0.1 7. 1. 0.00033 O171800300056 3.9 0.1 14. 1. 0.00033 O171800300057 4.2 0.1 22. 2. 0.00033 O171800300058 4.4 0.1 31. 3. 0.00033 O171800300059 4.7 0.1 39. 4. 0.00033 O171800300060 4.9 0.1 48. 5. 0.00033 O171800300061 5.2 0.1 51. 5. 0.00033 O171800300062 5.4 0.1 65. 6. 0.00033 O171800300063 5.7 0.1 73. 7. 0.00033 O171800300064 5.9 0.1 84. 8. 0.00033 O171800300065 6.2 0.1 85. 8. 0.00033 O171800300066 6.4 0.1 89. 9. 0.00033 O171800300067 6.7 0.1 93. 9. 0.00033 O171800300068 7.2 0.1 88. 9. 0.00033 O171800300069 7.4 0.1 86. 8. 0.00033 O171800300070 7.7 0.1 86. 8. 0.00033 O171800300071 8.2 0.1 82. 8. 0.00033 O171800300072 8.4 0.1 84. 8. 0.00033 O171800300073 8.7 0.1 82. 8. 0.00033 O171800300074 9.2 0.1 78. 8. 0.00033 O171800300075 9.7 0.1 75. 7. 0.00033 O171800300076 10.2 0.1 65. 6. 0.00033 O171800300077 10.6 0.1 62. 6. 0.00144 O171800300078 10.8 0.1 54. 5. 0.00144 O171800300079 11.3 0.1 50. 5. 0.00144 O171800300080 11.8 0.1 51. 5. 0.00144 O171800300081 12.3 0.1 53. 5. 0.00144 O171800300082 12.8 0.0 53. 5. 0.00144 O171800300083 13.3 0.0 49. 5. 0.00144 O171800300084 13.8 0.0 46. 5. 0.00144 O171800300085 14.3 0.0 41. 4. 0.00144 O171800300086 14.8 0.0 39. 4. 0.00144 O171800300087 19.9 0.0 24. 2. 0.00144 O171800300088 24.9 0.0 16. 2. 0.00144 O171800300089 29.9 0.0 15. 1. 0.00144 O171800300090 35.9 0.0 12. 1. 0.00144 O171800300091 ENDDATA 38 0 O171800300092 ENDSUBENT 91 0 O171800399999 SUBENT O1718004 20160730 O058O171800400001 BIB 11 28 O171800400002 REACTION (12-MG-24(HE3,P)13-AL-26-G,,SIG) O171800400003 METHOD (AMS) O171800400004 FACILITY (SPECM,2FR SAT) Accelerator Mass Spectroscopy at the O171800400005 Tandetron of Gif-sur-Yvette. O171800400006 SAMPLE 11 24Mg targets, of thicknesses ranging from 0.5 up O171800400007 to 17.7 mg/cm2 as a compromise between 26Al production O171800400008 and beam straggling and energy losses. O171800400009 ANALYSIS After irradiation, the targets were left apart for two O171800400010 years for short period nuclei radioactive decay (the O171800400011 activity was essentially coming from 22Na, t1/2 = 2.603O171800400012 CORRECTION Correction for potential escape of the recoiling O171800400013 Al-26 was made. The correction factors are below O171800400014 10% for all targets, except for the thinnest targets O171800400015 0.5 and 1.51 mg/cm**2. O171800400016 MISC-COL (MISC) The target thickness O171800400017 REL-REF (M,,J.F.Ziegler,J,NIM/B,219-220,1027,2004) O171800400018 ERR-ANALYS (MISC-ERR) The error in the target thickness in G/CM-SQO171800400019 (ERR-T) The error includes: O171800400020 * uncertainties in target thickness, He3 O171800400021 integrated flux in the Faraday cup, O171800400022 * counting statistics, O171800400023 (ERR-1) uncertainty in stability of the AMS(5%) and O171800400024 * the uncertainty on the escape correction factor. O171800400025 correction factor. O171800400026 (EN-ERR) the energy loss in the target calculated O171800400027 with TRIM (see REL-REF) O171800400028 STATUS (TABLE) Table 3 of PR/C,78,044613,2008 O171800400029 HISTORY (20160730U) SD: ERR-ANALYS update. DATA-ERR -> ERR-T. O171800400030 ENDBIB 28 0 O171800400031 COMMON 1 3 O171800400032 ERR-1 O171800400033 PER-CENT O171800400034 5.0 O171800400035 ENDCOMMON 3 0 O171800400036 DATA 7 11 O171800400037 EN EN-ERR DATA +ERR-T -ERR-T MISC O171800400038 MISC-ERR O171800400039 MEV MEV MB MB MB G/CM-SQ O171800400040 G/CM-SQ O171800400041 5.9 0.1 147. 47. 37. 0.00050 O171800400042 0.00005 O171800400043 7.6 0.6 155. 29. 26. 0.00340 O171800400044 0.00034 O171800400045 8.9 0.7 167. 31. 28. 0.00412 O171800400046 0.00041 O171800400047 10.2 0.6 122. 23. 21. 0.00393 O171800400048 0.00039 O171800400049 11.9 0.6 98. 18. 16. 0.00427 O171800400050 0.00043 O171800400051 14.3 0.7 54. 10. 9. 0.00577 O171800400052 0.00058 O171800400053 17.4 0.6 28. 5. 5. 0.00582 O171800400054 0.00058 O171800400055 20.4 0.6 23. 4. 4. 0.00609 O171800400056 0.00061 O171800400057 23.6 1.4 14. 3. 2. 0.0177 O171800400058 0.0018 O171800400059 23.8 1.2 13. 2. 2. 0.0144 O171800400060 0.0014 O171800400061 24.9 0.1 20. 5. 4. 0.00151 O171800400062 0.00015 O171800400063 ENDDATA 26 0 O171800400064 ENDSUBENT 63 0 O171800499999 ENDENTRY 4 0 O171899999999