Theoretical investigation of cross sections and astrophysical S-factors for the92Mo(α,n)95Ru and94Mo(α,n)97Ru reactions

Resonance Averaged Photoionization Cross Sections for Astrophysical Models

We present ground state photoionization cross sections of atoms and ions averaged over resonance structures for photoionization modeling of astrophysical sources. The detailed cross sections calculated in the closecoupling approximation using the R-matrix method, with resonances delineated at thousands of energies, are taken from the Opacity Project database TOPbase and the Iron Project, includ...

Neutron Cross Sections for Some Threshold Reactions

Three neutron reactions leading to production of the rare gases Ar41 and Xe135 have been in­ vestigated. Single crystal samples of KF, CaF2 , and BaF2 were irradiated in the Berlin reactor and the target-free absolute activities of the rare gas isotopes measured by a /^-/-coincidence method. The calculated cross sections are K41 (n,p)Ar41: o = ( 2 ,73±0,41) mb; o0= (98,6± 14,8) mb; Ca44(n,a)Ar4...

Cross sections for meson-meson nonresonant reactions

Meson-meson nonresonant reactions governed by the quark-interchange mechanism are studied in a potential that is derived from QCD. S-wave elastic phase shifts for I = 2 ππ and I = 3/2 Kπ scattering are obtained with wave functions determined by the central spin-independent term of the potential. The reactions include inelastic scatterings of two mesons in the ground-state pseudoscalar octet and...

Extraction of Astrophysical Cross Sections in the Trojan-Horse Method

The Trojan-horse method has been proposed to extract S-matrix elements of a two-body reaction at astrophysical energies from a related reaction with three particles in the ®nal state. This should be useful in cases where the direct measurement of the two-body reaction at the necessary low energies is experimentally dif®cult. The formalism of the Trojan-horse method for nuclear reactions is deve...

Theoretical Results for Top-quark Cross Sections and Distributions