TABLE II: Sample characteristics and activation parameters. Target Sample Diameter Mass t$_{a}$ Φ$_{tot}$ a isotope [mm] [mg] [10 18 atoms] [min] [10 14 n] $^{102}$Pd pd-1 10 452.5 26.1 9770 8.18 pd-2 8 301.5 17.4 5751 4.83 pd-3 12 339.5 19.6 7585 3.48 $^{120}$Te te-1 10 352.9 1.54 2617 1.96 te-2 10 441.2 1.93 1600 1.52 te-3 8 349.3 1.53 1406 1.56 te-4 8 417.2 1.83 4142 3.03 te-5 8 409.6 1.79 2593 3.09 $^{130}$Ba ba-1 8 106.9 0.346 7721 6.93 $^{132}$Ba 0.330 $^{130}$Ba ba-2 8 145.5 0.471 4014 2.70 $^{132}$Ba 0.448 $^{130}$Ba ba-3 10 149.7 0.484 4280 4.48 $^{132}$Ba 0.461 $^{156}$Dy dy-1 6 28.3 0.0588 964 0.995 dy-2 10 80.1 0.166 362 0.416 dy-3 6 61.6 0.128 902 1.73 a Total neutron exposure during activation. SetupGLYPH<.notdef>ofGLYPH<.notdef>two HPGeGLYPH<.notdef>CloverGLYPH<.notdef>detectors SingleGLYPH<.notdef>HPGeGLYPH<.notdef>detector GLYPH<c103> FIG. 3: Efficiency curves of the Clover detector system and the single HPGe detector. The statistical uncertainties of the calibration measurements correspond to the size of the sym- bols. The simulated efficiency of the Clover system (dashed line) was normalized to fit the measured data points. of four independent HPGe n-type crystals in a common cryostat. The two Clovers were placed face to face, in contact with a 5.2 mm thick sample holder, correspond- ing nearly to a 4 π geometry. The sample position in the very center of the system could be reproduced within ± 0.1 mm. The whole assembly was shielded against room background with 10 cm of lead and a 5 mm thick layer of copper. The data from the eight Ge crystals of the two Clover detectors were processed by separate analog to digital converters (ADCs) and could, therefore be an- alyzed independently. In Clover measurements, the con- tributions of the eight crystals were added to represent the total number of events per γ -ray line. The efficiency calibration of the Clover system was carried out with a set of weak reference sources. detector, and I$_{γ}$ the relative γ intensity per decay of the respective transition. K is a correction factor which is either the self-absorption correction factor K$_{γ}$ (Eq 2) or the total correction factor K$_{tot}$ (Table IV). The decay properties of the investigated product nuclei are summa- rized in Table III. The large distance between sample and detector in the measurements with the single HPGe detector allowed us to calculate the correction for γ -ray self-absorption from the expression for disk samples of thickness d [20], The total amount of activated nuclei N$_{act}$ at the end of each irradiation can be deduced from the number of events C in a particular γ -ray line registered in the HPGe detector during the measuring time t$_{m}$ [20], using the γ -ray absorption coefficients µ from Ref. [33]. This correction factor was negligible for the thin (10- 30 µ m) gold foils. The close geometry of the Clover detectors required a more elaborate treatment of the sample-related correc- tions in the measurement of the small activities of $^{103}$Pd and $^{133}$Ba$^{g}$. The correction factors K ′ γ for γ -ray self ab- sorption, K$_{E}$ for the extended geometry of the sample, and K$_{S}$ for the summing effect of cascade transitions have the been calculated by means of Monte Carlo simulations with the GEANT4 toolkit [34] and a detailed computer model of the setup [26] (Table IV). The summing correc- where t$_{w}$ denotes the waiting time between irradiation and activity measurement, ε$_{γ}$ the efficiency of the HPGe III. DATA ANALYSIS A. General procedure K$_{γ}$ = 1 − e − µd µd , (2) N$_{act}$ = C ( t$_{m}$ ) ε$_{γ}$ I$_{γ}$ K (1 − e − $^{λ t$_{m}$}$) e − λ t$_{w}$ (1) 4