ENTRY A0589 20031229 0000A058900000001 SUBENT A0589001 20031229 0000A058900100001 BIB 13 42 A058900100002 TITLE Absence of fusion suppression due to breakup in the A058900100003 12C+7Li reaction A058900100004 AUTHOR (A.Mukherjee, M.Dasgupta, D.J.Hinde, H.Timmers, A058900100005 R.D.Butt, P.R.S.Gomes) A058900100006 INSTITUTE (3AULCBR) Department of nuclear physics and departmentA058900100007 of electronic materials engineering A058900100008 (3BZLUFF) Instituto de fisica A058900100009 REFERENCE (J,PL/B,526,295,2002) A058900100010 REL-REF (N,,H.TIMMERS+,J,NIM/B,136,611,1998) A058900100011 (N,,H.TIMMERS+,J,NIM/B,161,19,2000) A058900100012 (N,,H.TIMMERS+,J,NIM/A,447,536,2000) A058900100013 Details of detector. A058900100014 SAMPLE An existing target of 7-Li/F, having 99.9% enrichment A058900100015 of 7-Li, was used. The target was of thickness ~80 A058900100016 microgramm/cm**2, evaporated onto a ~35 A058900100017 microgramm/cm**2 carbon backing. A very thin layer of A058900100018 Au (~4 microgramm/cm**2) was deposited on the target A058900100019 for beam dose and solid angle normalisation. The A058900100020 composition of the target was determined by elastic A058900100021 recoil detection analysis using a 58-Ni beam of energy A058900100022 60 MeV, which is less than half the Coulomb barrier A058900100023 energy for all target components. In terms of number A058900100024 of nuclei/cm2, the abundance of the various target A058900100025 components relative to 7-Li were measured to be: A058900100026 Li:F:C:O:Au A058900100027 = 1.00 : 1.00+/-0.01 : 0.96+/-0.01 A058900100028 : 0.0427+/-0.0004 : 0.0069+/-0.0003. A058900100029 MONITOR (79-AU-197(6-C-12,EL)79-AU-197,,DA) A058900100030 PART-DET (RCL) From alpha upto fluorine. A058900100031 DETECTOR (IOCH) Special ionization chamber. The full energy of A058900100032 the ions entering the detector was measured using a 21 A058900100033 cm long grid electrode, whilst the energy loss signal A058900100034 was obtained from a separate 3.2 cm long anode. A058900100035 FACILITY (VDGT,3AULCBR) The experiment was performed with a 12-CA058900100036 beam of energy 10.5 MeV, from the 14UD Pelletron A058900100037 accelerator. A058900100038 METHOD (EDE) A058900100039 (SITA) See SAMPLE A058900100040 (EXTB) A058900100041 ADD-RES (ANGD) Angular distributions for nitrogen and F+O+N A058900100042 HISTORY (20030709C) A058900100043 (20031229U) Last checking has been done. A058900100044 ENDBIB 42 0 A058900100045 COMMON 1 3 A058900100046 EN-CM A058900100047 MEV A058900100048 3.7 A058900100049 ENDCOMMON 3 0 A058900100050 ENDSUBENT 49 0 A058900199999 SUBENT A0589002 20031229 0000A058900200001 BIB 5 25 A058900200002 REACTION (3-LI-7(6-C-12,FUS),,SIG) A058900200003 MISC-COL (MISC) Fusion cross section after correction on low A058900200004 energy evaporated residues. See COMMENT A058900200005 ERR-ANALYS (ERR-T) Noany analysis is presented A058900200006 (MISC-ERR) Noany analysis is presented. A058900200007 COMMENT - By authors. It needs to be emphasized here that this A058900200008 cross-section, excluding evaporated residues having A058900200009 kinetic energies below 4 MeV and also excluding the A058900200010 evaporated residues C and B, is indeed the lower limit A058900200011 to the fusion cross-section at this energy. A058900200012 To compare with gamma-ray measurements, an estimate is A058900200013 needed of the cross-sections of evaporated residues A058900200014 with kinetic energies below 4 MeV, not available from A058900200015 the present measurement. Statistical model A058900200016 calculations performed using the code PACE, which A058900200017 reproduces the energy and angular dependence of the A058900200018 evaporated residues, predicted the contribution of A058900200019 evaporated residues below 4 MeV to be 20% of the total A058900200020 fusion cross-section. However, to take into account A058900200021 the possible dependence of the calculation on the A058900200022 various parameters in the code, this contribution belowA058900200023 4 MeV has been taken to be (20+/-8)%, where the A058900200024 uncertainty has been estimated very conservatively. A058900200025 REL-REF (A,O0946001,A.MUKHERJEE+,J,NP/A,596,299,1996) A058900200026 (D,,J.TAKAHASHI+,J,PRL,78,30,1997) A058900200027 ENDBIB 25 0 A058900200028 NOCOMMON 0 0 A058900200029 DATA 4 1 A058900200030 DATA ERR-T MISC MISC-ERR A058900200031 MB MB MB MB A058900200032 276. 35. 345. 56. A058900200033 ENDDATA 3 0 A058900200034 ENDSUBENT 33 0 A058900299999 ENDENTRY 2 0 A058999999999