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Stellar (n,gamma) cross sections of p-process isotopes Part I: Pd-102, Te-120, Ba-130,Ba-132, and Dy-156
(2010-01)
We have investigated the (n,gamma) cross sections of p-process isotopes with the activation technique. The measurements were carried out at the Karlsruhe Van de Graaff accelerator using the Li-7(p, n) Be-7 source for ...
The r-, p-, and nu p-Process
(IOP Publishing Ltd., 2010)
The processes discussed in this review are three of the four nucleosynthesis processes involved in producing heavy nuclei beyond Fe (not counting the rp-process in Xray bursts). Opposite to the fourth process (the s-process), ...
Measurements of high-energy neutron-induced fission of (nat)Pb and (209)Bi
(EDP Sciences, 2010)
The CERN Neutron Time-Of-Flight (n_TOF) facility is well suited to measure low cross sections as those of neutron-induced fission in subactinides. The cross section ratios of (nat)Pb and (209)Bi relative to (235)U and ...
Network calculations for r-process nucleosynthesis
(IOP Publishing Ltd., 2010)
The r-process is known to be responsible for the synthesis of about half of the elements heavier than iron, nevertheless its astrophysical site has not yet been clearly ascertained, but observations indicate that at least ...
Differences between stellar and laboratory reaction cross sections
(IOP Publishing Ltd., 2010)
Nuclear reactions proceed differently in stellar plasmas than in the laboratory due to the thermal effects in the plasma. On one hand, a target nucleus is bombarded by projectiles distributed in energy with a distribution ...
Astrophysical S-Factors and Reaction Rates of Threshold (p,n)-Reactions on (99-102)Ru
(American Institute of Physics (AIP), 2010)
Astrophysical S-factors of (p,n) reactions on (99)Ru, (100)Ru, (101)Ru, and (102)Ru were derived from the sum of experimental isomeric and ground states cross sections measured in the incident proton energy range of 5-9 ...
Alpha-induced reactions for the astrophysical p-process : the case of (151)Eu
(IOP Publishing Ltd., 2010)
The cross sections of (151)Eu(alpha, gamma)(155)Tb and (151)Eu(alpha,n)(154)Tb reactions have been measured with the activation method. Some aspects of the measurement are presented here to illustrate the requirements of ...
Astrophysical Reaction Rates as a Challenge for Nuclear Reaction Theory
(American Institute of Physics (AIP), 2010)
The relevant energy ranges for stellar nuclear reactions are introduced. Low-energy compound and direct reactions are discussed. Stellar modifications of the cross sections are presented. Implications for experiments are outlined.
Neutron cross-sections for next generation reactors : New data from n_TOF
(2010)
In 2002, an innovative neutron time-of-flight facility started operation at CERN: n_TOF. The main characteristics that make the new facility unique are the high instantaneous neutron flux, high resolution and wide energy ...
Boron depletion in 9 to 15 M(circle dot) stars with rotation
(Cambridge University Press, 2010)
The treatment of mixing is still one of the major uncertainties in stellar evolution models. One open question is how well the prescriptions for rotational mixing describe the real effects. We tested the mixing prescriptions ...