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