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Reaction cross sections of 169Tm(alpha,gamma)173Lu and 169Tm(alpha,n)172Luhave been measured in the energy range 12.6<=E_alpha<=17.5 MeV and11.5<=E_alpha<=17.5 MeV, respectively, using the recently introduced method ofcombining activation with X-ray counting. Improved shielding allowed to measurethe (alpha,gamma) to lower energy than previously possible. The combination of(alpha,gamma) and (alpha,n) data made it possible to study the energydependence of the alpha width. While absolute value and energy dependence areperfectly reproduced by theory at energies above 14 MeV, the observed change inenergy dependence at energies below 14 MeV requires a modification of thepredicted alpha width. Using an effective, energy-dependent, local opticalalpha+nucleus potential it is possible to reproduce the data but theastrophysical rate is still not well constrained at gamma-process temperatures.The additional uncertainty stemming from a possible modification of thecompound formation cross section is discussed. Including the remaininguncertainties, the recommended range of astrophysical reaction rate values at 2GK is higher than the previously used values by factors of 2-37.

Astrophysical analysis of the measurement of (alpha,gamma) and (alpha,n) cross sections of 169Tm