ENTRY O1182 20140205 O052O118200000001 SUBENT O1182001 20140205 O052O118200100001 BIB 11 57 O118200100002 TITLE Cross section measurements of the 89-Y(p,gamma)90-Zr O118200100003 reaction at energies relevant to P-process O118200100004 nucleosynthesis O118200100005 REFERENCE (J,PR/C,70,015802,2004) O118200100006 AUTHOR (P.Tsagari, M.Kokkoris, E.Skreti, A.G.Karydas, O118200100007 S.Harissopulos, T.Paradellis, P.Demetriou) O118200100008 INSTITUTE (2GRCATH) Institute of Nuclear Physics. O118200100009 (2BLGBRU) Institut d'Astronomie et d'Astrophysique. O118200100010 FACILITY (VDGT,2GRCATH) 5 MV Van de Graaff Tandem. O118200100011 SAMPLE The target used was produced by evaporation of pure O118200100012 (99.99%) metallic 89-Y on a Ta backing. Directly O118200100013 after this procedure, a thin layer of gold of 99.9999% O118200100014 purity was additionally evaporated on the target in O118200100015 order to prevent oxidization. The thickness of the O118200100016 target used was 436+/-24 mug/cm2 for the 89-Y layer andO118200100017 125+/-7 mug/cm2 for the gold "flush". The target was O118200100018 checked for possible deterioration after the end of theO118200100019 measurements and was found to be stable within 2%. O118200100020 DETECTOR (D4PI,NAICR) Gamma-single spectra were measured by O118200100021 means of a large 12 inches X 12 inches 4pi NaI(Tl) O118200100022 summing detector. The NaI(Tl) detector consists of twoO118200100023 scintillation crystals of cylindrical shape with a O118200100024 diameter of 305 mm and a length of 152.5 mm. Each O118200100025 crystal is segmented in four equal parts wrapped with O118200100026 aluminum (0.5 mm thick). With this detector O118200100027 arrangement, a solid angle of ~96% of 4pi covered for O118200100028 the gamma-rays emitted from the target at the O118200100029 crystals's center. The main advantage of using such O118200100030 a 4pi detector is that, instead of measuring and O118200100031 analyzing numerous gamma-cascade transitions, one O118200100032 observes angle-integrated gamma-ray fluxes due to the O118200100033 4pi geometry covered by the summing crystal; thus, O118200100034 systematic errors due to gamma-angular distribution O118200100035 effects are avoided. O118200100036 METHOD (EXTB) In order to keep the dead time below 5%-7%, O118200100037 especially at Ep>3 MeV, it was necessary to work with O118200100038 beam currents of less than 300 nanoampere on target. O118200100039 The beam energy spread was <1.2 KeV at Ep=872 keV. O118200100040 (BCINT) O118200100041 (GSPEC) O118200100042 ERR-ANALYS (ERR-1) Uncertainty of beam current integration. O118200100043 (ERR-2) Uncertainty of target thickness measurements. O118200100044 (ERR-T) The total errors in the cross sections are of O118200100045 the order of 9%-12% except for those in the cross O118200100046 sections determined at the four lowest energies. The O118200100047 latter errors range from 15% to 25%. Apart from O118200100048 statistical errors of <3% at Ep>2.5 MeV and ~10%-15% atO118200100049 Ep<2.5 MeV. Additional 6%-9% error in the simulated O118200100050 efficiency was also taken into account. O118200100051 COMMENT -By authors. In order to avoid systematic errors in O118200100052 our analysis, only gamma-ray fluxes with photon O118200100053 energies above 8 MeV were used to determine the cross O118200100054 section of the reaction of interest. O118200100055 HISTORY (20040823C) By F.Ch O118200100056 (20050317A) Additional reference is included. O118200100057 (20050317U) Last checking has been done. O118200100058 (20140205U) SD: NP/A,688,90 deleted (another exp.). O118200100059 ENDBIB 57 0 O118200100060 COMMON 2 3 O118200100061 ERR-1 ERR-2 O118200100062 PER-CENT PER-CENT O118200100063 5. 4. O118200100064 ENDCOMMON 3 0 O118200100065 ENDSUBENT 64 0 O118200199999 SUBENT O1182002 20040920 0000O118200200001 BIB 1 2 O118200200002 REACTION S(39-Y-89(P,G)40-ZR-90,,SIG) O118200200003 A(39-Y-89(P,G)40-ZR-90,,SIG,,SFC) O118200200004 ENDBIB 2 0 O118200200005 NOCOMMON 0 0 O118200200006 DATA 5 13 O118200200007 EN-CM DATA SERR-T SDATA AERR-T A O118200200008 MEV MICRO-B MICRO-B B*MEV B*MEV O118200200009 1.757 8. 2. 5816.E+04 1454.E+04 O118200200010 1.961 26. 5. 4466.E+04 859.E+04 O118200200011 2.16 40. 6. 2068.E+04 310.E+04 O118200200012 2.359 118. 16. 2154.E+04 292.E+04 O118200200013 2.656 339. 42. 1645.E+04 204.E+04 O118200200014 2.953 704. 86. 1122.E+04 137.E+04 O118200200015 3.25 1351. 150. 830.E+04 92.E+04 O118200200016 3.448 1903. 210. 665.E+04 73.E+04 O118200200017 3.843 2690. 296. 351.E+04 39.E+04 O118200200018 4.14 2936. 294. 202.E+04 20.E+04 O118200200019 4.437 2281. 230. 88.E+04 9.E+04 O118200200020 4.635 2127. 192. 58.E+04 5.E+04 O118200200021 4.832 2152. 194. 42.E+04 4.E+04 O118200200022 ENDDATA 15 0 O118200200023 ENDSUBENT 22 0 O118200299999 ENDENTRY 2 0 O118299999999