ENTRY O1308 20060108 O026O130800000001 SUBENT O1308001 20060108 O026O130800100001 BIB 10 46 O130800100002 TITLE First direct measurement of the total cross-section of O130800100003 12-C(alpha,gamma)16-O O130800100004 REFERENCE (J,EPJ/A,26,301,2005) O130800100005 REL-REF (R,,R.M.KREMER+,J,PRL,60,1475,1988) O130800100006 (R,,P.DYER+,J,NP/A,233,495,1974) O130800100007 (R,,K.-U.KETTNER+,J,ZP/A,308,73,1982) O130800100008 (R,,A.REDDER+,J,NP/A,462,385,1987) O130800100009 (R,C0439001,J.M.L.QUELLET+,J,PR/C,54,1982,1996) O130800100010 (R,A0652001,G.ROTERS+,J,EPJ/A,6,451,1999) O130800100011 (R,A0324001,L.GIALANELLA+,J,EPJ/A,11,357,2001) O130800100012 (R,A0428001,R.KUNZ+,J,PRL,86,3244,2001) O130800100013 The observations of the capture gamma-rays from O130800100014 12-C(alpha,gamma) reaction. O130800100015 AUTHOR (O.Schuermann, A.Di Leva, L.Gialanella, D.Rogalla, O130800100016 F.Strieder, N.De Cesare, A.D'Onofrio, G.Imbriani, O130800100017 R.Kunz, C.Lubritto, A.Ordine, V.Roca, C.Rolfs, O130800100018 M.Romano, F.Schuemann, F.Terrasi, H.-P.Trautvetter) O130800100019 INSTITUTE (2GERBOC) Institut fuer Experimentalphysik III. O130800100020 (2ITYNAP) And Dipartimento di Scienze della Vita. O130800100021 (2ITYFSN) O130800100022 SAMPLE A windowless He-4 gas target. The thickness of the O130800100023 extended windowless He gas target was determined usingO130800100024 the 4-He(7-Li,gamma)11-B reaction at E/lab = 1.668 MeV,O130800100025 energy loss measurements of different ions, and the O130800100026 4-He(7-Li,4-He)7-Li* reaction at E/lab = 3.325 MeV. O130800100027 The weighted average of the results yields N(4-He) = O130800100028 (4.21+/-0.14)E+17 atoms/cm2 with an effective target O130800100029 length of 42.6+/-1.4 mm, that corresponds to an energy O130800100030 loss for the 12-C ions smaller than 25 KeV in the O130800100031 investigated energy range. O130800100032 FACILITY (DYNAM,2GERBOC) O130800100033 (FRS,2GERBOC) The recoil separator ERNA. O130800100034 METHOD (EXTB) A beam purity better than 1.E-18 16-O ions per O130800100035 incident 12-C projectile has been achieved. O130800100036 (EDE) A total suppression factor (the ratio between O130800100037 leaky 12-C events detected in the telescope and the O130800100038 number of 12-C projectiles) of better than 5.E-14. O130800100039 HISTORY (20060108C) FC O130800100040 (20060108U) Last checking has been done. O130800100041 ERR-ANALYS (ERR-S) Statistical uncertainty. O130800100042 (ERR-SYS) Total systematic uncertainty due to O130800100043 (ERR-1) The uncertainty of target thickness; O130800100044 (ERR-2) The uncertainty of beam intensity; O130800100045 (ERR-3) The uncertainty of transmission of separator; O130800100046 (ERR-4) The uncertainty of charge state distribution; O130800100047 (ERR-5) The uncertainty of detector. O130800100048 ENDBIB 46 0 O130800100049 COMMON 6 3 O130800100050 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-SYS O130800100051 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT O130800100052 3. 2. 1. 2. 0.5 6.5O130800100053 ENDCOMMON 3 0 O130800100054 ENDSUBENT 53 0 O130800199999 SUBENT O1308002 20060108 O026O130800200001 BIB 2 4 O130800200002 REACTION (2-HE-4(6-C-12,G)8-O-16,,SIG,,SFC) O130800200003 Inverse kinematic has been used. O130800200004 COMMENT -By authors. The data in the energy range of the O130800200005 narrow resonances are left out. O130800200006 ENDBIB 4 0 O130800200007 NOCOMMON 0 0 O130800200008 DATA 3 75 O130800200009 EN-CM DATA ERR-S O130800200010 MEV B*KEV B*KEV O130800200011 1.903 31.8 4.3 O130800200012 1.953 36.3 5.3 O130800200013 2.003 39.9 4.3 O130800200014 2.102 49. 5.6 O130800200015 2.202 72.3 2.7 O130800200016 2.252 79.1 2.9 O130800200017 2.277 88.4 3. O130800200018 2.302 90.9 3.3 O130800200019 2.327 95.1 3. O130800200020 2.352 96.4 3. O130800200021 2.376 96.7 2.9 O130800200022 2.402 88.8 2.5 O130800200023 2.426 83. 2.7 O130800200024 2.451 70.2 2.9 O130800200025 2.476 63.3 3.1 O130800200026 2.501 54.7 1.7 O130800200027 2.551 42.8 1.5 O130800200028 2.601 34.4 1.1 O130800200029 2.75 19.2 0.7 O130800200030 2.8 17.3 0.7 O130800200031 2.85 17.4 0.6 O130800200032 2.9 17.1 0.5 O130800200033 2.949 17.7 0.6 O130800200034 2.999 20.3 0.6 O130800200035 3.049 27. 0.9 O130800200036 3.099 45.3 1.4 O130800200037 3.144 110.6 3.3 O130800200038 3.158 191.9 6. O130800200039 3.174 432. 11. O130800200040 3.184 797. 14. O130800200041 3.189 1156. 21. O130800200042 3.194 1392. 21. O130800200043 3.199 1363. 13. O130800200044 3.204 1001. 17. O130800200045 3.209 740. 17. O130800200046 3.214 484.6 8.2 O130800200047 3.224 244.5 5.8 O130800200048 3.249 84.2 2.5 O130800200049 3.298 26.1 0.9 O130800200050 3.348 16.1 0.5 O130800200051 3.398 12.9 0.5 O130800200052 3.448 11.7 0.4 O130800200053 3.498 11.3 0.4 O130800200054 3.548 11.6 0.4 O130800200055 3.597 11.3 0.4 O130800200056 3.647 11.9 0.3 O130800200057 3.697 12.8 0.4 O130800200058 3.747 13.8 0.4 O130800200059 3.797 14.3 0.4 O130800200060 3.847 16.6 0.5 O130800200061 3.896 17.6 0.5 O130800200062 3.946 23.1 0.7 O130800200063 3.996 23.7 0.7 O130800200064 4.046 29.5 0.9 O130800200065 4.096 34.2 1. O130800200066 4.145 41.3 1.1 O130800200067 4.195 57. 1.7 O130800200068 4.245 101.7 2.1 O130800200069 4.295 253.8 4.1 O130800200070 4.32 440. 11. O130800200071 4.345 744. 11. O130800200072 4.37 661. 13. O130800200073 4.395 331.5 5.5 O130800200074 4.42 183.4 4.9 O130800200075 4.445 110.5 2.5 O130800200076 4.494 53.6 1.6 O130800200077 4.545 31.6 0.9 O130800200078 4.594 19.7 0.6 O130800200079 4.644 16.7 0.5 O130800200080 4.694 14. 0.4 O130800200081 4.744 12.7 0.4 O130800200082 4.793 12.6 0.4 O130800200083 4.843 12.9 0.4 O130800200084 4.883 14.1 0.4 O130800200085 4.917 14.3 0.8 O130800200086 ENDDATA 77 0 O130800200087 ENDSUBENT 86 0 O130800299999 ENDENTRY 2 0 O130899999999