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Browsing by Author "Mohr, P."
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The 106Cd(α, α)106Cd elastic scattering in a wide energy range for γ process studies
Ornelas, A.; Kiss, G. G.; Mohr, P.; Galaviz, D.; Fülöp, Zs; Gyürky, Gy; Máté, Z.; Rauscher, T.; Somorjai, E.; Sonnabend, K.; Zilges, A. (2015-08-01)Alpha elastic scattering angular distributions of the <sup>106</sup>Cd(α, α)<sup>106</sup>Cd reaction were measured at three energies around the Coulomb barrier to provide a sensitive test for the α + nucleus optical ... -
Alpha-clustering and the stellar nucleosynthesis of carbon
Oberhummer, H.; Krauss, H.; Grun, K.; Rauscher, T.; Abele, H.; Mohr, P.; Staudt, G. (1994-09)The astrophysical S-factor and reaction rates for the triple-alpha process are calculated in the direct-capture model. It is shown that the stellar carbon production is extremely sensitive to small variations in the N-N ... -
alpha-nucleus potentials and photon-induced nucleosynthesis
Galaviz, D.; Babilon, M.; Fulop, Zs.; Gyurky, Gy.; Hillier, R.; Mate, Z.; Mohr, P.; Rauscher, T.; Somorjai, E.; Zilges, A.; Zolnai, L. (2003-05-05)New data for the Sn-112,Sn-12 4(alpha,alpha) (112,124) Sn reaction have been measured and are presently analyzed. Results of the Sn-112 circle times alpha potential at the energy Ec.m approximate to 14 MeV are presented. ... -
Determination of (gamma,n) reaction rates for the astrophysical gamma process
Vogt, K.; Mohr, P.; Rauscher, T.; Sonnabend, K.; Zilges, A. (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 ... -
Determination of (n,gamma) reaction rates at s-process branching points via their inverse reactions
Sonnabend, K.; Mengoni, A.; Mohr, P.; Rauscher, T.; Vogt, K.; Zilges, A. (2003-05-19)We present our method to determine the (n,gamma) reaction rates of s-process branching point nuclei using data of the inverse (gamma,n) reaction. As an example, we selected Zr-95. The analysis of the data of the reaction ... -
Determination of a-nucleus potentials by alpha-elastic scattering and its implications for the gamma-process
Galaviz, D.; Babilon, M.; Fulop, Zs.; Gyurky, Gy.; Mate, Z.; Hillier, R.; Mohr, P.; Rauscher, T.; Somorjai, E.; Zilges, A.; Zolnai, L. (2003-05-19)Complete angular distributions for the reactions Sn-112,Sn-124(alpha,alpha)(112,124) Sn have been measured at different energies around the Coulomb barrier. Preliminary results for the Sn-112 circle times alpha and Sn-124 ... -
Determination of the (n,gamma) reaction rate of unstable W-185 in the astrophysical s-process via its inverse reaction
Sonnabend, K.; Mengoni, A.; Mohr, P.; Rauscher, T.; Vogt, K.; Zilges, A. (2003-05-05)The (gamma,n) reaction rate of W-186 was measured in order to deduce the (n,gamma) reaction rate of 185 W, an important branching point in the astrophysical s-process. The theoretical predictions have been confirmed and ... -
Elastic alpha scattering on Sn-112 and Sn-124 at astrophysically relevant energies
Galaviz, D.; Fulop, Zs.; Gyurky, Gy.; Mate, Z.; Mohr, P.; Rauscher, T.; Somorjai, E.; Zilges, A. (2005-06)The cross sections for the elastic scattering reactions Sn-112,Sn-124(alpha,alpha)Sn-112,Sn-124 at energies above and below the Coulomb barrier are presented and compared to predictions for global alpha-nucleus potentials. ... -
Elastic alpha-scattering on proton rich nuclei at astrophysically relevant energies
Fulop, Zs.; Galaviz, D.; Gyurky, Gy.; Kiss, G. G.; Mate, Z.; Mohr, P.; Rauscher, T.; Somorjai, E.; Zilges, A. (American Institute of Physics (AIP), 2006)In order to improve the reliability of statistical model calculations in the region of heavy proton rich nuclei several elastic alpha scattering experiments have been carried out at low bombarding energies on various ... -
Experimental simulation of a stellar photon bath by bremsstrahlung: the astrophysical gamma-process
Mohr, P.; Vogt, K.; Babilon, M.; Enders, J.; Hartmann, T.; Hutter, C.; Rauscher, T.; Volz, S.; Zilges, A. (2000-08-31)The nucleosynthesis of heavy proton-rich nuclei in a stellar photon bath at temperatures of the astrophysical gamma-process was investigated where the photon bath was simulated by the superposition of bremsstrahlung spectra ... -
High precision 113In(α,α)113In elastic scattering at energies near the Coulomb barrier for the astrophysical γ process
Kiss, G. G.; Mohr, P.; Fulop, Zs.; Rauscher, T.; Gyurky, Gy.; Szücs, Tamas; Halasz, Z.; Somorjai, E.; Ornelas, A.; Yalcin, C.; Guray, R. T.; Ozkan, N. (2013-10-28)Background: The γ process in supernova explosions is thought to explain the origin of proton-rich isotopes between Se and Hg, the so-called p nuclei. The majority of the reaction rates for γ process reaction network studies ... -
How important is the Family? : Alpha nuclear potentials and p-process nucleosynthesis
Ornelas, A.; Galaviz, D.; Fueloep, Zs.; Gyuerky, Gy.; Kiss, G. G.; Mate, Zs.; Mohr, P.; Rauscher, T.; Somorjai, E.; Sonnabend, K.; Zilges, A. (SISSA, 2011-01)In this work we present the results from the analysis of the experimentally measured angular distributions of the reaction 106Cd(α , α )106 Cd at several different energies around the Coulomb barrier. The difficulties that ... -
Investigation of alpha-nuclear potential families from elastic scattering experiments
Ornelas, A.; Galaviz, D.; Fueloep, Zs.; Gyuerky, Gy.; Kiss, G.; Mate, Z.; Mohr, P.; Rauscher, T.; Somorjai, E.; Sonnabend, K.; Zilges, A. (IOP Publishing Ltd., 2012)In this work we present the continuation of the reported analysis [1] of the experimentally measured angular distributions of the reaction Cd-106(alpha, alpha)Cd-106 at several different energies around the Coulomb barrier. ... -
Measurement of the (gamma, n) cross section of the nucleus Au-197 close above the reaction threshold
Vogt, K.; Mohr, P.; Babilon, M.; Bayer, W.; Galaviz, D.; Hartmann, T.; Hutter, C.; Rauscher, T.; Sonnabend, K.; Volz, S.; Zilges, A. (2002-08-26)The cross section and the astrophysical reaction rate of the reaction Au-197(gamma,n)Au-196 have been measured close above the reaction threshold at E-thr = 8.071 MeV using the method of photoactivation. The results are ... -
Measurement of the (gamma,n) reaction rates of the nuclides Pt-190, Pt-192, and Pt-198 in the astrophysical gamma process
Vogt, K.; Mohr, P.; Babilon, M.; Enders, J.; Hartmann, T.; Hutter, C.; Rauscher, T.; Volz, S.; Zilges, A. (2001-05)The nucleosynthesis of heavy neutron-deficient nuclei in a stellar photon bath at the temperatures relevant for the astrophysical gamma process was investigated. In order to derive (gamma ,n) cross sections and reaction ... -
Mo-92(alpha,alpha)Mo-92 scattering, the Mo-92-alpha optical potential, and the Ru-96(gamma,alpha)Mo-92 reaction rate at astrophysically relevant energies
Fulop, Zs.; Gyurky, Gy.; Mate, Z.; Somorjai, E.; Zolnai, L.; Galaviz, D.; Babilon, M.; Mohr, P.; Zilges, A.; Rauscher, T.; Oberhummer, H.; Staudt, G. (2001-12)The elastic scattering cross section of (MO)-M-92(alpha,alpha)Mo-92 has been measured at energies of E-c.m. approximate to 13, 16, and 19 MeV in a wide angular range. The real and imaginary parts of the optical potential ... -
The (n,gamma) cross sections of short-living s-process branching points
Sonnabend, K.; Mengoni, A.; Mohr, P.; Rauscher, T.; Vogt, K.; Zilges, A. (American Institute of Physics (AIP), 2004)An experimental method to determine the (n,gamma) cross section of short-living s-process branching points using data of the inverse (gamma,n) reaction is presented. The method was used to observe the branching point nucleus ... -
Neutron capture cross section of Ti-44
Ejnisman, R.; Goldman, I.D.; Krane, K.S.; Mohr, P.; Nakazawa, Y.; Norman, E. B.; Rauscher, T.; Reel, J. (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 ... -
Neutron capture of Si-30
Beer, H.; Sedyshev, P.V.; Rochow, W.; Rauscher, T.; Mohr, P. (2002-10-21)At the Karlsruhe and Tubingen 3.75 MV Van de Graaff accelerators the cross section of the reaction Si-30(n,gamma)Si-31(2.62h) was measured by the activation technique via the beta spectrum of the Si-31-decay. Natural silicon ... -
Opportunities to constrain astrophysical reaction rates for the s-process via determination of the ground-state cross-sections
Rauscher, T.; Mohr, P.; Dillmann, I.; Plag, R. (2011-09-10)Modern models of s-process nucleosynthesis in stars require stellar reaction rates of high precision. Most neutron-capture cross-sections in the s-process have been measured, and for an increasing number of reactions the ...