Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 16: Structure and Dynamics of Nuclei 3

HK 16.1: Vortrag

Montag, 23. März 2015, 17:00–17:15, T/HS2

The nuclear structure input to astrophysics — •Nadia Tsoneva^1,2 and Horst Lenske¹ — ¹Institut fur Theoretische Physik, Universität Gießen, Heinrich-Buff-Ring 16, D-35392 Gieβen, Germany — ²Institute for Nuclear Research and Nuclear Energy, 1784 Sofia, Bulgaria

The impact of low-energy multipole excitations and pygmy resonances on radiative neutron and proton capture reactions cross sections in nuclei close to the β-stability line is investigated. For this purpose, a microscopic theoretical approach based on self-consistent density functional theory and QRPA formalism supplemented by multi-phonon degrees of freedom, is implemented in a statistical reaction model. The advantage of the method is the fully microscopic nuclear structure input which incorporates low-energy multiphonon excitations, pygmy resonances and core polarization effects related to giant resonances in a unified way. Of particular interest are the pygmy resonances which are found important for the description of nuclear reaction rates of the nucleosynthesis. Calculations of the cross sections of the reactions ⁸⁵Kr(n,γ)⁸⁶Kr, ⁸⁷Sr(n,γ)⁸⁸Sr and ⁸⁹Y(p,γ)⁹⁰Zr are discussed in comparison with the experiment. For the cross sections of the reactions ⁸⁹Zr(n,γ)⁹⁰Zr and ⁹¹Mo(n,γ)⁹²Mo theoretical predictions are made.The work is supported by BMBF grant 05P12RGFTE.