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