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The reaction rate sensitivity of nucleosynthesis in type II supernovae
(1999-08-20)
We explore the sensitivity of the nucleosynthesis of intermediate-mass elements (28 less than or equal to A less than or similar to 80) in supernovae derived from massive stars to the nuclear reaction rates employed in the ...
Measurements of proton radiative capture cross sections relevant to the astrophysical rp- and gamma-processes
(1999-06-21)
Measurements have been made of the Zr-96(p,gamma)Nb-97, Sn-112(p,gamma)Sb-113, and Sn-119(p,gamma) Sb-120 cross section excitation functions, Incident proton energies ranged from 2.8 MeV to 8.5 MeV. These reactions are ...
The astrophysical r-process : A comparison of calculations following adiabatic expansion with classical calculations based on neutron densities and temperatures
(1999-05-01)
The rapid neutron-capture process (r-process) encounters unstable nuclei far from beta-stability. Therefore its observable features, like the abundances, witness (still uncertain) nuclear structure as well as the conditions ...
Stellar neutron capture cross sections of Pr and Dy isotopes
(1999-02)
The neutron capture cross sections of Pr-141, Dy-160, Dy-161, Dy-161, Dy-163 and Dy-164 have been measured in Be energy range from 3 to 225 keV at the Karlsruhe 3.75 MV Van de Graaff accelerator. Neutrons were produced via ...
Cross section measurements of (p,gamma)-reactions relevant to p-process.
(American Institute of Physics, 1999)
The cross sections of the Nb-93(p,gamma)Mo-94 and Y-89(p,gamma)Zr-90 reactions have been measured over the proton energy range 1.4-4.8 MeV and 1.6-2.4 MeV respectively. The results are compared with the predictions of ...
Explosive nucleosynthesis close to the drip lines
(1998-11)
We give an overview of explosive burning and the role which neutron and/or proton separation energies play. We focus then on the rapid neutron capture process (r-process) which encounters unstable nuclei with neutron ...
Neutron capture cross section of Ti-44
(1998-10)
The cross section for thermal neutron capture by radioactive Ti-44 was measured to be sigma(gamma) = 1.1 +/- 0.2 b. This result was shown to be in agreement with a direct capture calculation. Possible implications of the ...
Proton capture cross sections of the ruthenium isotopes
(1998-07)
The proton capture cross sections of the stable ruthenium isotopes 96, 98, 99, and 104 have been measured by means of the activation method in the proton energy range between 1.5 and 3 MeV. Thin layers of natural ruthenium ...
Experimental cross section of Sm-144(alpha, gamma)Gd-148 and implications for the p-process
(1998-05-20)
The cross section of the Sm-144(alpha, gamma) Gd-148 reaction has been measured at bombarding energies in the 10.5-13.4 MeV range using an activation method based on the off-line alpha-activity measurement of the Gd-148 ...