ENTRY O1520 20070716 O031O152000000001 SUBENT O1520001 20070716 O031O152000100001 BIB 14 67 O152000100002 TITLE He-3(a,g)Be-7 cross section at low energies. O152000100003 AUTHOR (Gy.Gyuerky, F.Confortola, H.Costantini, A.Formicola, O152000100004 D.Bemmerer, R.Bonetti, C.Broggini, P.Corvisiero, O152000100005 Z.Elekes, Zs.Fuelop, G.Gervino, A.Guglielmetti, O152000100006 C.Gustavino, G.Imbriani, M.Junker, M.Laubenstein, O152000100007 A.Lemut, B.Limata, V.Lozza, M.Marta, R.Menegazzo, O152000100008 P.Prati, V.Roca, C.Rolfs, C.Rossi Alvarez, E.Somorjai,O152000100009 O.Straniero, F.Strieder, F.Terrasi, H.P.Trautvetter) O152000100010 INSTITUTE (3HUNDEB) O152000100011 (2ITYGVA) O152000100012 (2ITYLGS) O152000100013 (2ITYPAD) O152000100014 (2GERDRE) O152000100015 (2ITYMIL) O152000100016 (2ITYTUR) O152000100017 (2ITYNAP) O152000100018 (2GERBOC) O152000100019 (2ITYOAC) Osservatorio Astronomico Collurania, Teramo.O152000100020 (2ITYFSN) O152000100021 REFERENCE (J,PR/C,75,035805,2007) O152000100022 (J,PRL,97,122502,2006) It is O1399 O152000100023 Cross section data at E=127-169-keV. O152000100024 SAMPLE Enriched He-3 gas, isotopic purity more than 99.95%, O152000100025 pressure 0.7-mbar, target thickness 8-10 keV, was used.O152000100026 DETECTOR (SOLST) A 100-mum thick silicon detector detects O152000100027 projectiles that have been elastically scattered first O152000100028 in the target gas and subsequently in a movable 15- O152000100029 mug/cm**2 carbon foil. O152000100030 (HPGE) Two 120% relative efficiency HPGE detectors O152000100031 called LNGS1 and LNGS2. O152000100032 The number of Be-7 nuclei is determined by measuring O152000100033 the Be-7 activity on a Cu-catcher. O152000100034 FACILITY (ACCEL,2ITYLGS) The 400 kV LUNA accelerator. O152000100035 The beam energy is obtained from a precision resistor O152000100036 chain and have 5 eV/hour long-term stability. O152000100037 METHOD (ACTIV) O152000100038 HISTORY (20070715C) O152000100039 (20070716U) Last checking has been done. O152000100040 ERR-ANALYS (ERR-1).The error in Be-7 counting efficiency is 1.8%. O152000100041 (ERR-2).The error in beam intensity is 1.5%. O152000100042 (ERR-3).The error in beam heating effect is 1.3%. O152000100043 (ERR-4).The error in target pressure and temperature O152000100044 without beam is 0.8%. O152000100045 (ERR-5).The error in Be-7 backscattering is 0.5%. O152000100046 (ERR-6).The error in incomplete Be-7 collection is O152000100047 0.5%. O152000100048 (ERR-7).The error in Be-7 distribution in catcher is O152000100049 0.4%. O152000100050 (ERR-8).The error in 478-keV gamma-ray branching is O152000100051 0.4%. O152000100052 (ERR-9).The error in Be-7 half-life is 0.1% O152000100053 (ERR-10).The error in N(2) contamination in target gas O152000100054 is 0.1%, O152000100055 (ERR-11). The error in parasitic Be-7 production is O152000100056 0.1%. O152000100057 (EN-ERR).The error in effective energy is 0.5-1.1%. O152000100058 (ERR-SYS).The total systematics errors is 3%. See O152000100059 above. O152000100060 (ERR-S).The errors due to statistics-activity O152000100061 measurements. O152000100062 CORRECTION Correction for beam heating, contaminant gases, O152000100063 backscattering, collection losses was made. O152000100064 MONITOR (13-AL-27(P,G)14-SI-28,,SIG) Catcher Al for back- O152000100065 scattered Be-7. O152000100066 COMMENT *By authors*.The present data touch the energy O152000100067 range relevant to Big-Bang Li-7 production. O152000100068 STATUS (TABLE) O152000100069 ENDBIB 67 0 O152000100070 COMMON 12 6 O152000100071 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 O152000100072 ERR-7 ERR-8 ERR-9 ERR-10 ERR-11 EN-ERR O152000100073 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT O152000100074 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT O152000100075 1.8 1.5 1.3 0.8 0.5 0.5O152000100076 0.4 0.4 0.1 0.1 0.1 1.1O152000100077 ENDCOMMON 6 0 O152000100078 ENDSUBENT 77 0 O152000199999 SUBENT O1520002 20070716 O031O152000200001 BIB 2 5 O152000200002 REACTION 1(2-HE-3(A,G)4-BE-7,,SIG,,SFC) O152000200003 2(2-HE-3(A,G)4-BE-7,,SIG,,,DERIV) O152000200004 COMMENT *By authors*.The effective center mass energy has been O152000200005 calculated assuming a constant S-factor over the targetO152000200006 length. O152000200007 ENDBIB 5 0 O152000200008 NOCOMMON 0 0 O152000200009 DATA 7 1 O152000200010 EN-CM DATA 1ERR-S 1ERR-SYS 1DATA 2ERR-S 2O152000200011 ERR-SYS 2 O152000200012 KEV B*KEV PER-CENT PER-CENT NB NB O152000200013 NB O152000200014 105.6 0.516 5.2 3.1 0.567 0.029O152000200015 0.016 O152000200016 ENDDATA 6 0 O152000200017 ENDSUBENT 16 0 O152000299999 ENDENTRY 2 0 O152099999999