6 V. RESULTS IV. UNCERTAINTIES A. $^{102}$Pd(n, γ ) $^{103}$Pd B. $^{120}$Te(n, γ ) $^{121}$Te C. $^{130}$Ba(n, γ ) $^{131}$Ba D. $^{132}$Ba(n, γ ) $^{133}$Ba For $^{132}$Ba the partial cross section to the isomeric state ( t$_{1}$$_{/}$$_{2}$ = 38 . 9 h) could be measured in addition to the total (n, γ ) cross section. The latter measurement was performed with the Clover detector because of the long In all cases, the total uncertainties include the 2.0-2.2% uncertainty of the gold measurements. Summing corrections are another potential source of uncertainties. In the measurements with the single HPGe detector these corrections are small due to the low effi- ciency and can be completely avoided by selecting cas- cades with only one strong transition. In case of the mea- surements with the Clover system, the summing correc- tions were determined by detailed GEANT simulations [34] of the complete setup [26]. Since these corrections turned out to be rather small (Table IV) the related un- certainties have almost no impact on the final results. Minor uncertainties arise from the sample masses, which were determined to ± 0.1 mg, self absorption cor- rections, and counting statistics. The isotopic composi- tions also exhibit rather small uncertainties, except for $^{120}$Te and $^{156}$Dy, where 11.1% and 5.4% are assigned in Ref. [22], respectively (Table I). Similar to other rare isotopes, i.e. $^{184}$Os, $^{190}$Pt, or $^{180}$Ta, the uncertainties were conservatively treated to ”cover the range of prob- able isotope-abundance variations among different mate- rials as well as experimental errors” [22]. As described in Sec. II we have therefore for $^{120}$Te calculated a weighted average of two recent measurements [24, 25] and a cor- rected value from an older measurement [23, 24] with a standard deviation of 0.9%. Significant uncertainties were contributed by the sam- ple position, detector efficiencies, and γ -ray intensities. In the activations the position of the samples relative to the Au foils was estimated to ± 0.25 mm, leading to a 2% uncertainty in the neutron flux. The same uncertainty had to be assigned to the efficiency calibration of both detector systems. The largest uncertainties were in most cases introduced by the adopted γ -ray intensities, I$_{γ}$ , an aspect that can be improved if more accurate spectro- scopic data become available. The experimental uncertainties are summarized in Ta- ble V. Since nearly every stellar neutron cross section measurement was carried out relative to gold, the 1.4% uncertainty of the gold cross section [21] cancels out in most astrophysical applications. Due to the weak γ transitions the activated samples were counted with the Clover system. The γ spectra of the Pd samples were analyzed via the ”strongest” transi- tion in $^{103}$Rh at 357 keV. The second strongest transition at 497 keV was already too weak and could not be ana- lyzed. The experimental neutron capture cross section is 〈 σ$_{exp}$ 〉 = 376 ± 17 mbarn (Table VI). The Te samples were analyzed via the 573 keV γ -line from the β + decay of $^{121}$Teg into $^{121}$Sb. The partial cross section to the isomeric state could be determined only after a waiting time of 80 d, when the large Comp- ton background around 210 keV, which was observed im- mediately after the irradiation, was sufficiently reduced to reveal the expected 212 keV line from the IT decay to the ground state. The results are 470.6 ± 22.7 mbarn for the neutron capture cross section to the ground-state and 67.6 ± 2.9 mbarn for the partial cross section to the isomeric state, leading to a total ( n, γ ) cross section of 〈 σ$_{exp}$ 〉 = 538.2 ± 25.6 mbarn (Table VII). The $^{130}$Ba cross section has been measured via the transitions at 216 and 373 keV from the β + decay into $^{131}$Cs. The two strongest transitions, 124 keV ( I$_{γ}$ =29.8 (3) %) and 496 keV ( I$_{γ}$ =48.0 (4) %), were not used in this analysis because these lines are affected by coinci- dence summing effects (summing-out into the 620 keV transition). Due to the short isomeric half-life of 14.6 min the partial cross section to the isomer could not be de- termined. The resulting total experimental cross section is 〈 σ$_{exp}$ 〉 = 736 ± 29 mbarn (Table VIII). In this section, the results of the present work are pre- sented in tabular form with a short discussion of the vari- ous measurements. The comparison with previous results will be given in the Sec. VI for the Maxwellian average cross sections 〈 σ 〉 kT calculated on the basis of the mea- sured 〈 σ$_{exp}$ 〉 reported here. the isomer (88.6% IT, 11.4% EC) is even longer-lived than the ground-state, the contributions of both states to the total cross section have to be properly disentan- gled. The partial cross section to the ground state can be deduced from the γ spectra of the first few days, where the contribution from the isomer decay is still small. The exact correction for the ground-state was discussed in de- tail in Ref. [13] and has been used here.