D. Galaviz

Measurement of the (gamma, n) cross section of the nucleus Au-197 close above the reaction threshold

The cross section and the astrophysical reaction rate of the reaction Au-197(gamma,n)Au-196 have been measured close above the reaction threshold at E-thr = 8.071 MeV using the method of photoactivation. The results are compared to those of several previous measurements as well as to theoretical calculations. The relevance of the reaction Au-197(gamma,n)Au-196 as a standard for photoactivation experiments is discussed

Elastic α scattering on Sn 112 and Sn 124 at astrophysically relevant energies

The cross sections for the elastic scattering reactions {112,124}Sn(a,a){112,124}Sn at energies above and below the Coulomb barrier are presented and compared to predictions for global alpha-nucleus potentials. The high precision of the new data allows a study of the global alpha-nucleus potentials at both the proton and neutron-rich sides of an isotopic chain. In addition, local alpha-nucleus potentials have been extracted for both nuclei, and used to reproduce elastic scattering data at higher energies. Predictions from the capture cross section of the reaction 112Sn(a,g)116Te at astrophysically relevant energies are presented and compared to experimental data.

Polarization sensitivity of a segmented HPGe detector up to 10 MeV

Abstract Linear γ-ray polarization can be measured using segmented germanium detectors. The polarization sensitivity of the Compton scattering process leads to asymmetries in the signals of a segmented detector. We have measured the polarization sensitivity of a four-fold segmented large volume germanium detector up to photon energies of approximately 10 MeV for the first time. The detector and its performance are compared to smaller Compton polarimeters which have been analyzed in previous work. A possible application of the described Compton polarimeter will be parity assignments in photon scattering experiments.

Nucleosynthesis by photon-induced reactions

Abstract Similar to the well-known Gamow window for charged particle induced reactions, there exists an effective energy window for photon-induced reactions. Properties of this window are discussed in detail for (γ, n) and (γ, α) reactions. These reactions are important for the nucleosynthesis of rare neutron-deficient p nuclei.

Re187(γ,n) cross section close to and above the neutron threshold

The neutron capture cross section of the unstable nucleus

Determination of α-nucleus potentials by α-elastic scattering and its implications for the γ-process

^{186}\mathrm{Re}

Elastic alpha-scattering of 112Sn and 124Sn at astrophysically relevant energies

is studied by investigating the inverse photodisintegration reaction

α-nucleus potentials and photon-induced nucleosynthesis

^{187}\mathrm{Re}

High precision ^{89}Y(α,α)^{89}Y scattering at low energies

(

Re-187 (gamma,n) cross section close to and above the neutron threshold

\ensuremath{\gamma},n