Search
Now showing items 21-30 of 30
Determination of (gamma,n) reaction rates for the astrophysical gamma process
(2003-05-05)
(gamma,n) cross sections and reaction rates in the astrophysical gamma-process have been measured for the nucleus Pb-204 using the method of photoactivation. Some peculiarities of the (gamma,n) cross.section of this nucleus ...
Hydrostatic and explosive nucleosynthesis in massive stars using improved nuclear and stellar physics
(2003-05-05)
We have performed the first calculations to follow the evolution of all stable nuclei and their radioactive progenitors in a finely-zoned stellar model computed from the onset of central hydrogen burning through explosion ...
The s-process branching at W-185
(2003-01-20)
The neutron capture cross section of the unstable nucleus W-185 has been derived from experimental photoactivation data of the inverse reaction W-186(gamma, n) W-185. The new result of sigma = 687 +/- 110 mbarn confirms ...
Se(p,gamma) cross section measurements for p-process studies
(World Scientific Publishing, 2003)
As a continuation of a systematic study of reactions relevant to astrophysical p-process, the (p,gamma) or (p,n) cross sections of three Se isotopes have been measured using an activation technique in the proton energy ...
The importance of parity-dependence of the nuclear level density in the prediction of astrophysical reaction rates
(World Scientific Publishing, 2003)
A simple description for obtaining the parity distribution of nuclear levels in the pf + g(9/2) shell as a function of excitation energy was recently derived. We implement this in a global nuclear level density model. In ...
Nuclear physics issues of the r-process
(World Scientific Publishing, 2003)
The present paper aims at understanding r-process nucleosynthesis by addressing the nuclear physics involved, the necessary environment conditions in the (stellar) production sites, and the observational constraints. We ...
Astrophysical reaction rate for the Li-8(n,gamma)Li-9 reaction
(2003-01)
An attempt was made to measure the excitation function of the cross section for the Li-8(n,gamma)Li-9 reaction by performing the inverse reaction Li-9(gamma,n)Li-8, with the equivalent photons in the electric field of ...
Reaction rates and nuclear properties relevant for nucleosynthesis in massive stars and far from stability
(World Scientific Publishing, 2003)
Explosive nuclear burning in astrophysical environments produces unstable nuclei which again can be targets for subsequent reactions. In addition, it involves a large number of stable nuclides which are not fully explored ...
The origin of the Ca-Ti-Cr-Fe-Ni isotopic anomalies in the inclusion EK-1-4-1 of the Allende meteorite
(2003)
The origin of the correlated Ca-Ti-Cr-Fe-Ni isotopic anomalies in the Ca-Al-rich inclusion of the EK-1-4-1 of the Allende is a longstanding puzzle. The search for a stellar environment which could explain the enrichment ...