ENTRY O1714 20081212 O038O171400000001 SUBENT O1714001 20081212 O038O171400100001 BIB 12 43 O171400100002 TITLE Search for the alpha+He-6 decay of Be-10 via the O171400100003 O-16(O-18,Be-10)Mg-24 reaction. O171400100004 AUTHOR (N.Curtis, N.I.Ashwood, M.Freer, T.Munoz-Britton, O171400100005 V.A.Ziman, S.Brown, W.N.Catford, N.P.Patterson, O171400100006 J.S.Thomas, D.C.Weisser) O171400100007 INSTITUTE (2UK BIR) O171400100008 (2UK SUR) O171400100009 (3AULCBR) O171400100010 REFERENCE (J,JP/G,36,015108,2009) O171400100011 SAMPLE A 200-mug/cm**2 lithium oxide Li(2)O foil supported by O171400100012 a 10 mug/cm**2 C-12 backing was used as target. O171400100013 DETECTOR (TELES,SISD,CSICR) Two forward mounted telescopes O171400100014 each consisting of three separate 50*50 mm elements. O171400100015 The first, a 70 mum thick double sided silicon strip O171400100016 detector, was segmented into 32 independent 3 mm wide O171400100017 strips, the 16 strips on the front face being O171400100018 horizontal and the 16 strips on the back face vertical.O171400100019 The second stage was comprised of a 500 mum thick O171400100020 resistive silicon strip detector segmented into 16 O171400100021 separate, position sensitive strips. O171400100022 The third element in each telescope, a 10 mm thick O171400100023 Cs(I)-scintillator, was used to stop any highly O171400100024 energetic particles. O171400100025 A mylar absorbers were used to stop elastically O171400100026 scattered O-18 beam particles from entering the delta-EO171400100027 detector, reducing the counting and event pile-up ratesO171400100028 INC-SOURCE The detectors were calibrated using a combination of O171400100029 alpha-particles from a 3-line alpha-source and 25 MeV O171400100030 C-12 ions elastically scattered from a Au-197 target. O171400100031 The energy resolution was approx. 120 keV (FWHM) for O171400100032 the silicon detectors and approx. 1.5%(FWHM) for the O171400100033 CsI-crystals. O171400100034 FACILITY (VDGT,3AULCBR) The 14 UD tandem Van de Graaff O171400100035 accelerator facility of the Australian National O171400100036 University. O171400100037 METHOD (COINC) decay fragments were detected in coincidence O171400100038 in two detector telescopes. O171400100039 (EDE) O171400100040 (BCINT).The integrated beam exposure at 80 and 100 MeV O171400100041 was 2.9 amd 0.93 mC, respectively. O171400100042 PART-DET (2-HE-6,A) O171400100043 STATUS (TABLE).Table 3. O171400100044 HISTORY (20081212C) SB O171400100045 ENDBIB 43 0 O171400100046 NOCOMMON 0 0 O171400100047 ENDSUBENT 46 0 O171400199999 SUBENT O1714002 20081212 O038O171400200001 BIB 4 13 O171400200002 REACTION (3-LI-7(8-O-18,A+2-HE-6)7-N-15,PAR,SIG) O171400200003 EN-SEC (E-EXC,9-F-19) O171400200004 COMMENT *By authors*.The cross-section for the O171400200005 Li-7(O-18,A+N-15)2-He-6 proton transfer reaction has O171400200006 been obtained from the observed yield in the F-19 O171400200007 excitation energy. The yields, integrated between O171400200008 E-EXC=8-17 MeV in the 80 MeV beam data and O171400200009 E-EXC=7.5-23 MeV in the 100 MeV beam data,were O171400200010 efficiency corrected Monte Carlo simulations, performedO171400200011 over these same excitation energy ranges. O171400200012 ERR-ANALYS (DATA-ERR).The error is reported by authors in table. O171400200013 The quoted uncertainties are dominated by an estimated O171400200014 20% error in the target thickness. O171400200015 ENDBIB 13 0 O171400200016 NOCOMMON 0 0 O171400200017 DATA 5 2 O171400200018 EN E-EXC-MIN E-EXC-MAX DATA DATA-ERR O171400200019 MEV MEV MEV MICRO-B MICRO-B O171400200020 80. 8.0 17.0 31.7 6.6 O171400200021 100. 7.5 23.0 31.8 6.6 O171400200022 ENDDATA 4 0 O171400200023 ENDSUBENT 22 0 O171400299999 SUBENT O1714003 20081212 O038O171400300001 BIB 4 9 O171400300002 REACTION (3-LI-7(8-O-18,A+2-HE-6)7-N-15,PAR,SIG) O171400300003 EN-SEC (E-EXC,9-F-19) O171400300004 COMMENT *By authors*.The cross-section obtained for the O171400300005 individual peaks. These were obtained by fitting O171400300006 Gaussian line shapes to the peaks above smoothly O171400300007 varying backgrounds. They yields were then efficiency O171400300008 corrected Monte Carlo simulations at the relevant O171400300009 excitation energy in F-19. O171400300010 ERR-ANALYS (DATA-ERR).The error is reported by authors in table. O171400300011 ENDBIB 9 0 O171400300012 NOCOMMON 0 0 O171400300013 DATA 4 3 O171400300014 EN E-EXC DATA DATA-ERR O171400300015 MEV MEV MICRO-B MICRO-B O171400300016 80. 9.52 0.87 0.23 O171400300017 80. 10.32 1.24 0.30 O171400300018 100. 15.18 1.38 0.37 O171400300019 ENDDATA 5 0 O171400300020 ENDSUBENT 19 0 O171400399999 SUBENT O1714004 20081212 O038O171400400001 BIB 3 10 O171400400002 REACTION (8-O-16(8-O-18,A+2-HE-6)12-MG-24,PAR,SIG) O171400400003 EN-SEC (E-EXC,4-BE-10) O171400400004 COMMENT *By authors*.In order to obtain an upper limit to the O171400400005 cross section for the O-16(O-18,A+2-He-6)Mg-24 O171400400006 reaction, a number of Monte Carlo simulated events wereO171400400007 added to the total energy spectra. The simulations wereO171400400008 performed over the same Be-10 excitation energy range O171400400009 E-EXC=9-20.7 MeV in the 80 MeV beam data and O171400400010 E-EXC=9.8-26.1 MeV in the 100 MeV beam data,were O171400400011 efficiency corrected and the cross sections determined.O171400400012 ENDBIB 10 0 O171400400013 NOCOMMON 0 0 O171400400014 DATA 4 2 O171400400015 EN E-EXC-MIN E-EXC-MAX DATA-MAX O171400400016 MEV MEV MEV MICRO-B O171400400017 80. 9.0 20.7 1.9 O171400400018 100. 9.8 26.1 3.9 O171400400019 ENDDATA 4 0 O171400400020 ENDSUBENT 19 0 O171400499999 SUBENT O1714005 20081212 O038O171400500001 BIB 3 15 O171400500002 REACTION (6-C-12(8-O-18,A+2-HE-6)10-NE-20,PAR,SIG) O171400500003 EN-SEC (E-EXC,4-BE-10) O171400500004 COMMENT *By authors*.In order to obtain an upper limit to the O171400500005 cross section for the C-12(O-18,A+2-He-6)Ne-20 O171400500006 reaction, a number of Monte Carlo simulated events wereO171400500007 added to the total energy spectra. The simulations wereO171400500008 performed over the same Be-10 excitation energy range O171400500009 E-EXC=9-20.7 MeV in the 80 MeV beam data and O171400500010 E-EXC=9.8-26.1 MeV in the 100 MeV beam data,were O171400500011 efficiency corrected and the cross sections determined.O171400500012 The large difference in upper limits between O-16 and O171400500013 C-12 target constituents mainly reflects the very O171400500014 different nominal target thicknesses of 10 mug/cm**2 O171400500015 for the C-12 backing and approx. 107 mug/cm**2 for the O171400500016 O-16 content of the Li(2)O foil. O171400500017 ENDBIB 15 0 O171400500018 NOCOMMON 0 0 O171400500019 DATA 4 2 O171400500020 EN E-EXC-MIN E-EXC-MAX DATA-MAX O171400500021 MEV MEV MEV MICRO-B O171400500022 80. 9.0 20.7 52. O171400500023 100. 9.8 26.1 65. O171400500024 ENDDATA 4 0 O171400500025 ENDSUBENT 24 0 O171400599999 ENDENTRY 5 0 O171499999999