ENTRY A0428 20160708 A085A042800000001 SUBENT A0428001 20160708 A085A042800100001 BIB 11 54 A042800100002 TITLE 12-C(a,gamma)16-O: the key reaction in stellar A042800100003 nucleosynthesis. A042800100004 AUTHOR (R.Kunz, M.Jaeger, A.Mayer, J.W.Hammer, G.Staudt, A042800100005 S.Harissopulos, T.Paradellis) A042800100006 REFERENCE (J,PRL,86,3244,2001) A042800100007 #doi:10.1103/PhysRevLett.86.3244 A042800100008 (J,AJ,567,643,2002) Reaction rate was calculated. A042800100009 #doi:10.1086/338384 A042800100010 (T,Kunz,2002) Uni. Stuttgart, revised data sets in A042800100011 Anhang I. A042800100012 REL-REF (N,,A.Redder+,J,NP/A,462,385,1987) A042800100013 (N,C0439001,J.M.L.Ouellet+,J,PR/C,54,1982,1996) A042800100014 (N,A0652001,G.Roters+,J,EPJ/A,6,451,1999) A042800100015 There are previous investigations on the subject A042800100016 INSTITUTE (2GERIFS) A042800100017 (2GERTUE) Physikalisches Institut A042800100018 (2GRCATH) Institute of Nuclear Physics A042800100019 COMMENT Abstract. The angular distributions of gamma-rays A042800100020 from the 12-C(A,G)16-O reaction have been measured at A042800100021 20 energy points in the energy range Ecm = 0.95 to A042800100022 2.8 MeV. The sensitivity of the present experiment A042800100023 compared to previous direct investigations was raised A042800100024 by 1-2 orders of magnitude, by using an array of A042800100025 highly efficient (100%) Ge detectors shielded A042800100026 actively with BGOs, as well as high beam currents of A042800100027 up to 500 micro-a were provided by the Stuttgart A042800100028 dynamitron accelerator. The S(E1) and S(E2) factors A042800100029 deduced from the gamma angular distributions have A042800100030 been extrapolated to the range of helium burning A042800100031 temperatures applying the R-Matrix method, which A042800100032 yielded S(E1)/300 = (76 +/- 20) KeV*B and S(E2)/300 = A042800100033 =(85 +/- 30) KeV*B. A042800100034 FACILITY (DYNAM,2GERIFS) A042800100035 SAMPLE The target used were produced by implanting 12-C atoms A042800100036 into gold. The gold layered backing used for this A042800100037 purpose was especially developed for long term A042800100038 experiments and high beam power of up to 10 KW/cm**2. A042800100039 The depletion in respect to the detrimental 13-C was A042800100040 improved by a factor of 1000. The target was replaced A042800100041 when a deterioration of about 20% was found. A042800100042 METHOD (BCINT) A042800100043 (EXTB) A042800100044 (GSPEC) A042800100045 DETECTOR (HPGE) An array of three or four large detectors in A042800100046 close geometry, actively shielded with bismuth A042800100047 germanate crystals. A042800100048 (BGO) The crystals were used for active shielding and A042800100049 anti-compton detectors. A042800100050 The whole detector setup was placed on a heavy A042800100051 motor-driven revolving table. A042800100052 HISTORY (20020719C) A042800100053 (20040604A) Additional reference has been added. A042800100054 (20040604U) Last checking has been done. A042800100055 (20160708U) REFERENCE was corrected. A042800100056 ENDBIB 54 0 A042800100057 NOCOMMON 0 0 A042800100058 ENDSUBENT 57 0 A042800199999 SUBENT A0428002 20021217 0000A042800200001 BIB 6 18 A042800200002 REACTION (6-C-12(A,G)8-O-16,EP,SIG,,SFC) A042800200003 PART-DET (G) Gamma energy around 9 MeV was measured. A042800200004 ANALYSIS (INTAD) The values for Sigma(E1), Sigma(E2)/Sigma(E1), A042800200005 and Sigma(E2) have been obtained by using the formula A042800200006 for the interference of E1 and E2 transitions in A042800200007 angular distributions, given in the paper of Dyer and A042800200008 barnes . The Parameter (PHASE) Of this Formula was not A042800200009 Kept open, but determined by using the elastic alpha - A042800200010 scattering data of Plaga and D'Agostino Bruno. A042800200011 REL-REF (R,,P.DYER+,J,NP/A,233,495,1974) A042800200012 (R,C0064001,R.PLAGA+,J,NP/A,465,291,1987) A042800200013 (R,,M.D'AGOSTINO BRUNO+,J,NC,27,1,1975) A042800200014 ERR-ANALYS (ERR-T) The uncertainties include both statistical and A042800200015 systematic errors induced by R-Matrix analysis and A042800200016 fitting procedure. A042800200017 CORRECTION The data have been properly corrected for target A042800200018 deterioration due to sputtering and for any effects dueA042800200019 to finite geometry. A042800200020 ENDBIB 18 0 A042800200021 NOCOMMON 0 0 A042800200022 DATA 4 40 A042800200023 EN-CM POLAR DATA ERR-T A042800200024 KEV NO-DIM B*KEV B*KEV A042800200025 945. -1. 2.7 16.5 A042800200026 945. 2. 2.9 21.8 A042800200027 1254. -1. 14.7 3. A042800200028 1254. 2. 18.8 6.1 A042800200029 1451. -1. 14.4 2.1 A042800200030 1451. 2. 11.4 2.6 A042800200031 1572. -1. 11.9 10.6 A042800200032 1572. 2. 5.6 11.4 A042800200033 1702. -1. 18.6 2.4 A042800200034 1702. 2. 6.6 1.4 A042800200035 1997. -1. 25. 3.1 A042800200036 1997. 2. 2.4 0.6 A042800200037 2072. -1. 29.5 3.6 A042800200038 2072. 2. 3.1 0.7 A042800200039 2147. -1. 40.8 4.9 A042800200040 2147. 2. 3.3 0.7 A042800200041 2184. -1. 49.7 6. A042800200042 2184. 2. 2.7 0.6 A042800200043 2223. -1. 58.9 4.9 A042800200044 2223. 2. 4. 0.5 A042800200045 2259. -1. 53.6 34.8 A042800200046 2259. 2. 7.1 19.6 A042800200047 2299. -1. 47.8 15.3 A042800200048 2299. 2. 9.8 12.9 A042800200049 2335. -1. 62.9 33.4 A042800200050 2335. 2. 10.9 25.4 A042800200051 2374. -1. 64.9 7.7 A042800200052 2374. 2. 2.6 0.6 A042800200053 2407. -1. 62.5 7.5 A042800200054 2407. 2. 2.1 0.6 A042800200055 2449. -1. 30.8 11.8 A042800200056 2449. 2. 5.1 10.2 A042800200057 2486. -1. 36. 4.4 A042800200058 2486. 2. 2.2 0.7 A042800200059 2526. -1. 25.2 3. A042800200060 2526. 2. 0.8 0.3 A042800200061 2771. -1. 6.1 3. A042800200062 2771. 2. 3.8 4.1 A042800200063 2787. -1. 7.5 2.4 A042800200064 2787. 2. 0.6 1.6 A042800200065 ENDDATA 42 0 A042800200066 ENDSUBENT 65 0 A042800299999 SUBENT A0428003 20021217 0000A042800300001 BIB 4 8 A042800300002 REACTION ((6-C-12(A,G)8-O-16,EP,SIG)// A042800300003 (6-C-12(A,G)8-O-16,EP,SIG)) A042800300004 STATUS (DEP,A0482002) A042800300005 MISC-COL (MISC) The phase for P.Dyer and C.A.Barnes formula A042800300006 ERR-ANALYS (ERR-T) The uncertainties include both statistical and A042800300007 systematic errors induced by r-matrix analysis and A042800300008 fitting procedure. A042800300009 (MISC-ERR) Any information is absent A042800300010 ENDBIB 8 0 A042800300011 COMMON 2 3 A042800300012 POLAR-NM POLAR-DN A042800300013 NO-DIM NO-DIM A042800300014 2. 1. A042800300015 ENDCOMMON 3 0 A042800300016 DATA 5 20 A042800300017 EN-CM DATA ERR-T MISC MISC-ERR A042800300018 KEV NO-DIM NO-DIM ADEG ADEG A042800300019 945. 1.097 4.515 59. A042800300020 1254. 1.277 0.324 55. A042800300021 1451. 0.79 0.137 53. A042800300022 1572. 0.468 0.862 52. A042800300023 1702. 0.355 0.055 49. A042800300024 1997. 0.095 0.021 40. A042800300025 2072. 0.105 0.017 35. A042800300026 2147. 0.081 0.012 28. A042800300027 2184. 0.055 0.009 24. A042800300028 2223. 0.068 0.006 17. A042800300029 2259. 0.132 0.355 10. A042800300030 2299. 0.202 0.246 1. A042800300031 2335. 0.174 0.392 9. A042800300032 2374. 0.039 0.007 21. A042800300033 2407. 0.034 0.008 32. A042800300034 2449. 0.152 0.279 44. A042800300035 2486. 0.061 0.016 53. A042800300036 2526. 0.031 0.008 61. A042800300037 2771. 0.63 0.597 87. 9. A042800300038 2787. 0.078 0.203 67. 37. A042800300039 ENDDATA 22 0 A042800300040 ENDSUBENT 39 0 A042800399999 SUBENT A0428004 20021217 0000A042800400001 BIB 5 8 A042800400002 REACTION M(6-C-12(A,G)8-O-16,EP,SIG,,SFC,CALC) A042800400003 T(6-C-12(A,G)8-O-16,,SIG,,SFC,CALC) A042800400004 STATUS (DEP,A0428002) A042800400005 ANALYSIS (RFN) A042800400006 ERR-ANALYS (ERR-T) The uncertainty is given in original paper A042800400007 without any analysis. A042800400008 COMMENT - By authors: astrophysical factor due to gamma A042800400009 cascades has been extracted as 4 +/-4 B*KeV A042800400010 ENDBIB 8 0 A042800400011 COMMON 1 3 A042800400012 EN-CM A042800400013 KEV A042800400014 300. A042800400015 ENDCOMMON 3 0 A042800400016 DATA 5 2 A042800400017 POLAR MDATA MDATA TERR-T MERR-T T A042800400018 NO-DIM B*KEV B*KEV B*KEV B*KEV A042800400019 -1. 76. 165. 20. 50. A042800400020 +2. 85. 30. A042800400021 ENDDATA 4 0 A042800400022 ENDSUBENT 21 0 A042800499999 ENDENTRY 4 0 A042899999999