13 research outputs found
The rp-process and new measurements of beta-delayed proton decay of light Ag and Cd isotopes
Recent network calculations suggest that a high temperature rp-process could
explain the abundances of light Mo and Ru isotopes, which have long challenged
models of p-process nuclide production. Important ingredients to network
calculations involving unstable nuclei near and at the proton drip line are
-halflives and decay modes, i.e., whether or not -delayed proton
decay takes place. Of particular importance to these network calculation are
the proton-rich isotopes Ag, Ag, Cd and Cd. We
report on recent measurements of -delayed proton branching ratios for
Ag, Ag, and Cd at the on-line mass separator at GSI.Comment: 4 pages, uses espcrc1.sty. Proceedings of the 4th International
Symposium Nuclei in the Cosmos, June 1996, Notre Dame/IN, USA, Ed. M.
Wiescher, to be published in Nucl.Phys.A. Also available at
ftp://ftp.physics.ohio-state.edu/pub/nucex/nic96-gs
Discovery of palladium, antimony, tellurium, iodine, and xenon isotopes
Currently, thirty-eight palladium, thirty-eight antimony, thirty-nine
tellurium, thirty-eight iodine, and forty xenon isotopes have been observed and
the discovery of these isotopes is discussed here. For each isotope a brief
synopsis of the first refereed publication, including the production and
identification method, is presented.Comment: to be published in At. Data Nucl. Data Table
Discovery of Yttrium, Zirconium, Niobium, Technetium, and Ruthenium Isotopes
Currently, thirty-four yttrium, thirty-five zirconium, thirty-four niobium,
thirty-five technetium, and thirty-eight ruthenium isotopes have been observed
and the discovery of these isotopes is discussed here. For each isotope a brief
synopsis of the first refereed publication, including the production and
identification method, is presented.Comment: To be published in Atomic Data and Nuclear Data Table
Discovery of Rubidium, Strontium, Molybdenum, and Rhodium Isotopes
Currently, thirty-one rubidium, thirty-five strontium, thirty-five molybdenum
and thirty-eight rhodium isotopes have been observed and the discovery of these
isotopes is discussed here. For each isotope a brief synopsis of the first
refereed publication, including the production and identification method, is
presented.Comment: To be published in Atomic Data and Nuclear Data Table
Measurement of the cross section of the Li-8(d,alpha)He-6 reaction of possible relevance to big bang nucleosynthesis
We report measurements of the cross section of the Li-8(d, alpha) He-6 reaction in the energy range E-c.m. =2.3-3.5 MeV using a Li-8-radioactive beam on a CD2 foil. The astrophysical S factor and reaction rate were calculated from the measured cross section. The He-6 nuclei produced in the reaction were detected in solidstate detector telescopes. This reaction might have affected the primordial abundance of Li-6 in big bang nucleosynthesis, since He-6 beta decays to Li-6. However, several big bang nucleosynthesis network calculations were found to be insensitive to this reaction, suggesting that the Li-8(d, alpha) He-6 reaction does not affect Li-6 primordial production
Measurement of the cross section of the 8Li(d,α)6He reaction of possible relevance to big bang nucleosynthesis
We report measurements of the cross section of the 8Li(d,α)6He reaction in the energy range Ec.m. = 2.3-3.5 MeV using a 8Li-radioactive beam on a CD2 foil. The astrophysical S factor and reaction rate were calculated from the measured cross section. The 6He nuclei produced in the reaction were detected in solid-state detector telescopes. This reaction might have affected the primordial abundance of 6Li in big bang nucleosynthesis, since 6He beta decays to 6Li. However, several big bang nucleosynthesis network calculations were found to be insensitive to this reaction, suggesting that the 8Li(d, α)6He reaction does not affect 6Li primordial production
209Bi(6He,α) reaction mechanisms studied near the Coulomb barrier using n–α coincidence measurements
AbstractThe 6He+209Bi reaction displays a remarkably large cross section for α-particle emission at energies near the Coulomb barrier. The possible reactions that may produce the observed α particles include two-neutron transfer, one-neutron transfer, and direct projectile breakup. Each of these mechanisms results in a distinctive angular correlation between the α particle and outgoing neutron(s). A neutron-α-particle coincidence experiment was performed to separate these different modes. The neutron data show significant angular correlations. Monte Carlo simulations of one-neutron transfer are compared with the experimental data. It is shown that approximately 20% of the observed α-particle yield is due to this process