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Browsing by Author "Guber, K. H."
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Direct neutron capture cross sections of Ni-62 in the s-process energy range
Rauscher, T.; Guber, K. H. (2002-08)Direct neutron capture on Ni-62 is calculated in the DWBA and the Maxwellian averaged cross sections and astrophysical reaction rates in the energy range relevant for s-process nucleosynthesis are given. It is confirmed ... -
Erratum: Direct neutron capture cross sections of 62Ni in the s-process energy range [Phys. Rev. C 66, 028802 (2002)]
Rauscher, T.; Guber, K. H. (2005-05) -
High-resolution neutron capture and transmission measurements, and the stellar neutron-capture cross section of Sr-88
Koehler, P. E.; Winters, R.R.; Guber, K. H.; Rauscher, T.; Harvey, J. A.; Raman, S.; Spencer, R.R.; Blackmon, J.C.; Larson, D.C.; Bardayan, D.W.; Lewis, T.A. (2000-11)We have made new and improved measurements of the neutron capture and total cross sections for Sr-88 at the Oak Ridge Electron Linear Accelerator (ORELA). Improvements over previous measurements include a wider incident ... -
High-resolution neutron capture and transmission measurements, and the stellar neutron-capture cross section of Sr-88 (vol C62, art. no. 055803, 2000)
Koehler, P. E.; Winters, R.R.; Guber, K. H.; Rauscher, T.; Harvey, J. A.; Raman, S.; Spencer, R.R.; Blackmon, J.C.; Larson, D.C.; Bardayan, D.W.; Lewis, T.A. (2001-04) -
Improving explosive nucleosynthesis models via (n,alpha) measurements
Koehler, P. E.; Gledenov, Y.M.; Andrzejewski, J.; Guber, K. H.; Raman, S.; Rauscher, T. (2001-05-21)In explosive environments, (gamma,alpha) reactions constitute some of the most important links in the nucleosynthesis chains. However. it is very unlikely that the rates for most of these reactions will be determined by ... -
Neutron capture reaction rates for silicon and their impact on the origin of presolar mainstream SiC grains
Guber, K. H.; Koehler, P. E.; Derrien, H.; Valentine, T.E.; Leal, L.C.; Sayer, R.O.; Rauscher, T. (2003-06)We have made new, improved measurements of the Si28-30 (n, gamma) cross sections and have done a resonance analysis of these data including previous total cross sections. Together with the calculated contributions due to ... -
New Maxwellian averaged neutron capture cross sections for Cl-35,Cl-37
Guber, K. H.; Sayer, R.O.; Valentine, T.E.; Leal, L.C.; Spencer, R.R.; Harvey, J. A.; Koehler, P. E.; Rauscher, T. (2002-05)The Oak Ridge Electron Linear Accelerator (ORELA) was used to measure neutron total and capture cross sections of natural chlorine in the energy range from 100 eV to 600 keV. We performed an R-matrix analysis of our new ... -
Prediction of astrophysical reaction rates as a challenge to nuclear physics
Rauscher, T.; Guber, K. H. (2003-05-05)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 ... -
R-matrix analysis of Cl neutron cross sections up to 1.2 MeV
Sayer, R. O.; Guber, K. H.; Leal, L. C.; Larson, N. M.; Rauscher, T. (2006-04)We have analyzed and evaluated Cl-35, Cl-37, and Cl-nat neutron cross section data in the resolved resonance region with the multilevel Reich-Moore R-matrix formalism. Energies and widths were determined for 388 resonances ... -
Reaction rates and nuclear properties relevant for nucleosynthesis in massive stars and far from stability
Rauscher, T.; Froehlich, Carla; Guber, K. H. (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 ... -
Recent experiments at ORELA and LANSCE, and their impact on compound nuclear models
Koehler, P. E.; Guber, K. H.; Harvey, J. A.; Rauscher, T.; Ullmann, J. L.; Bredeweg, T. A.; O'Donnell, J. M.; Reifarth, R.; Rundberg, R. S.; Vieira, D. J.; Wouters, J. M. (American Institute of Physics, 2008)We present results from two recent sets of experiments to demonstrate the continuing impact of neutron time-of-flight data on the underlying assumptions and parameters of compound nuclear models. -
Sm-147(n,alpha) cross section measurements from 3 eV to 500 keV : Implications for explosive nucleosynthesis reaction rates
Gledenov, Y.M.; Koehler, P. E.; Andrzejewski, J.; Guber, K. H.; Rauscher, T. (2000-10)We have measured the Sm-147(n, alpha) cross section from 3 eV to 500 keV. These data were used to test nuclear statistical models which must be relied on to calculate the rates for as yet unmeasurable reactions occurring ...