ENTRY O1433 20070605 O028O143300000001 SUBENT O1433001 20070605 O028O143300100001 BIB 15 62 O143300100002 TITLE New gamma-ray measurements for C-12+C-12 sub-coulomb O143300100003 fusion-toward data unification. O143300100004 AUTHOR (E.F.Aguilera, P.Rosales, E.Martinez-Quiroz, G.Murilo, O143300100005 M.Fernandez, H.Berdejo, D.Lizcano, A.Gomes-Camacho, O143300100006 R.Policroniades, A.Varela, E.Moreno, E.Chavez, O143300100007 M.E.Ortiz, A.Huerta, T.Belyaeva, M.Wiescher) O143300100008 INSTITUTE (3MEXINI) O143300100009 (3MEXUMX) O143300100010 (1USANOT) O143300100011 REFERENCE (J,PR/C,73,064601,2006) O143300100012 REL-REF (N,,P.ROSALES+,J,RMF,49,88,2003) Preliminary results O143300100013 (R,,H.W.BECKER+,J,ZP/A,303,305,1981) For correction ofO143300100014 fusion residues cross sections formed directly in theirO143300100015 ground states by particle decay. O143300100016 COMMENT -By authors-.The gamma-ray technique is used with a newO143300100017 absolute normalization method which is independent of O143300100018 charge collection, allowing one to monitor at the same O143300100019 time the carbon buildup as the target. O143300100020 HISTORY (20060706C) By S.B O143300100021 (20070605U) Last checking has been done. O143300100022 SAMPLE An amorphous carbon foil deposited onto a thick Ta- O143300100023 backing so that the evaporation residues were fully O143300100024 stopped. O143300100025 To prevent too much target thickening, three carbon O143300100026 foils were used in successive stages of the experiment O143300100027 with repeat points taken whenever the target changed. O143300100028 The original foil thicknesses were 19.2+-0.9-mug/cm**2,O143300100029 22.7+-1.0-mug/cm**2 and 29.9+-1.4-mug/cm**2. O143300100030 ADD-RES (COMP).Barrier penetration model calculations. O143300100031 The extrapolation of the astrophysical S-factor to O143300100032 lower energies is discussed on the basis of the unifiedO143300100033 data. O143300100034 MONITOR (6-C-12(6-C-12,EL)6-C-12,,DA) A silicon surface barrierO143300100035 detector was placed at 160-degree in order to measure O143300100036 the C-12 ions elastically scattered from the O143300100037 Ta-backing. O143300100038 This produces a thick-target spectrum that can be used O143300100039 to determine the absolute normalization factors O143300100040 involving both the target thickness and the integrated O143300100041 number of projectiles. O143300100042 DETECTOR (HPGE) Two detectors placed at 125- and 55-degrees wereO143300100043 used to measure the secondary gamma-rays emitted by O143300100044 the evaporation residues. Measurements at these anglesO143300100045 effectively minimize the effects of possible O143300100046 anisotropies in the gamma-radiation and the comparison O143300100047 of spectra at the two angles permits easy O143300100048 identification of any doppler shift effects. O143300100049 FACILITY (VDGT,3MEXINI) The En Tandem accelerator O143300100050 METHOD (GSPEC) O143300100051 (SITA) See sample O143300100052 (EXTB) O143300100053 ERR-ANALYS (ERR-T) The total uncertainty includes the statistical O143300100054 errors and O143300100055 (ERR-1) The uncertainty for number of projectiles. O143300100056 (ERR-2) The uncertainty of the target thickness. O143300100057 (ERR-3) The additional systematic error not included inO143300100058 total uncertainty is associated with the solid angle O143300100059 measurement for the monitor detector O143300100060 errors associated with the gamma-detector efficiency O143300100061 are also included, but their contribution is generally O143300100062 negligible. O143300100063 STATUS (TABLE) Table 1 in paper O143300100064 ENDBIB 62 0 O143300100065 COMMON 3 3 O143300100066 ERR-1 ERR-2 ERR-3 O143300100067 PER-CENT PER-CENT PER-CENT O143300100068 2. 4. 5. O143300100069 ENDCOMMON 3 0 O143300100070 ENDSUBENT 69 0 O143300199999 SUBENT O1433002 20070605 O028O143300200001 BIB 1 4 O143300200002 REACTION 1(6-C-12(6-C-12,A)10-NE-20,,SIG) O143300200003 2(6-C-12(6-C-12,P)11-NA-23,,SIG) O143300200004 3(6-C-12(6-C-12,N)12-MG-23,,SIG) O143300200005 4(6-C-12(6-C-12,FUS),,SIG) O143300200006 ENDBIB 4 0 O143300200007 NOCOMMON 0 0 O143300200008 DATA 9 29 O143300200009 EN-CM DATA 1ERR-T 1DATA 2ERR-T 2DATA 3O143300200010 ERR-T 3DATA 4ERR-T 4 O143300200011 MEV MB MB MB MB MB O143300200012 MB MB MB O143300200013 4.42 0.65 0.06 0.25 0.03 0.05O143300200014 0.02 0.95 0.07 O143300200015 4.5 0.6 0.04 0.26 0.02 0.03O143300200016 0.01 0.89 0.04 O143300200017 4.59 0.65 0.04 0.38 0.02 0.02O143300200018 0.01 1.05 0.05 O143300200019 4.66 0.93 0.06 0.54 0.03 0.03O143300200020 0.01 1.5 0.07 O143300200021 4.74 1.29 0.07 0.76 0.04 0.04O143300200022 0.01 2.09 0.08 O143300200023 4.82 2.51 0.13 1.44 0.08 0.15O143300200024 0.02 4.1 0.15 O143300200025 4.88 4.58 0.24 2.74 0.14 0.43O143300200026 0.03 7.75 0.28 O143300200027 4.89 4.47 0.24 2.32 0.12 0.29O143300200028 0.04 7.08 0.28 O143300200029 4.96 5.35 0.29 3.64 0.19 0.39O143300200030 0.03 9.38 0.35 O143300200031 5.03 6.26 0.34 4.18 0.22 0.27O143300200032 0.03 10.71 0.41 O143300200033 5.1 4.53 0.24 3.38 0.17 0.24O143300200034 0.03 8.15 0.3 O143300200035 5.19 4.43 0.26 3.34 0.19 0.24O143300200036 0.03 8.02 0.33 O143300200037 5.26 6.5 0.34 3.78 0.19 0.38O143300200038 0.03 10.65 0.39 O143300200039 5.34 8.6 0.45 4.45 0.23 0.5O143300200040 0.05 13.55 0.5 O143300200041 5.42 12.62 0.68 6.12 0.33 1.02O143300200042 0.08 19.76 0.76 O143300200043 5.49 15.3 0.83 6.14 0.33 1.61O143300200044 0.11 23.05 0.9 O143300200045 5.57 22.27 1.17 8.63 0.45 1.36O143300200046 0.11 32.27 1.25 O143300200047 5.64 38.78 2.01 16.76 0.86 2.73O143300200048 0.18 58.27 2.19 O143300200049 5.72 38.66 1.96 19.5 0.99 2.8O143300200050 0.19 60.96 2.2 O143300200051 5.79 29.69 1.54 13.6 0.7 1.87O143300200052 0.15 45.15 1.7 O143300200053 5.87 24.04 1.35 13.49 0.75 2.44O143300200054 0.15 39.96 1.55 O143300200055 5.95 50.67 2.53 22.68 1.12 5.36O143300200056 0.3 78.71 2.78 O143300200057 6.02 59.71 2.98 27.58 1.37 4.71O143300200058 0.28 92. 3.29 O143300200059 6.1 37.35 1.88 21.77 1.08 3.2O143300200060 0.2 62.31 2.17 O143300200061 6.17 50.79 2.7 31.08 1.63 3.67O143300200062 0.23 85.54 3.16 O143300200063 6.25 69.84 4.14 35.09 2.07 3.3O143300200064 0.24 108.23 4.63 O143300200065 6.32 76.87 3.78 44.52 2.17 4.29O143300200066 0.24 125.67 4.37 O143300200067 6.4 68.5 3.38 33.59 1.65 4.51O143300200068 0.25 106.6 3.77 O143300200069 6.48 84.82 4.34 34.9 1.78 7.36O143300200070 0.43 127.07 4.71 O143300200071 ENDDATA 62 0 O143300200072 ENDSUBENT 71 0 O143300299999 ENDENTRY 2 0 O143399999999