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Nuclear Theory·nucl-th

Monday·August 17, 2020

7 papers—2 primary·5 cross-listed

All7Primary2Cross-lists5
  1. 01

    Following nuclei through nucleosynthesis: a novel tracing technique

    T. M. Sprouse · M. R. Mumpower · R. Surman

    Astrophysical nucleosynthesis is a family of diverse processes by which atomic nuclei undergo nuclear reactions and decays to form new nuclei. The complex nature of nucleosynthesis, which can involve as many as tens of thousands of interactions between thousands of nuclei, makes it difficult to study any one of these interactions in isolation using standard approaches. In this work, we present a new technique, nucleosynthesis tracing, that we use to quantify the specific role of individual nuclear reaction, decay, and fission processes in relationship to nucleosynthesis as a whole. We apply this technique to study fission and -decay as they occur in the rapid neutron capture () process of nucleosynthesis.

    nucl-thPRC(2021)·38 citations
  2. 02

    Light element () production from spontaneous ternary fission of Cf

    G. Röpke · J. B. Natowitz · H. Pais

    The yields of light elements () obtained from spontaneous ternary fission of Cf are treated within a nonequilibrium approach, and the contribution of unstable nuclei and excited bound states is taken into account. These light cluster yields may be used to probe dense matter, and to infer in-medium corrections. Continuum correlations are calculated from scattering phase shifts using the Beth-Uhlenbeck formula, and the effect of medium modification is estimated. The relevant distribution is reconstructed from the measured yields of isotopes. This describes the state of the nucleon system at scission and cluster formation, using only three Lagrange parameters which are the nonequilibrium counterparts of the temperature and chemical potentials, as defined in thermodynamic equilibrium. We concluded that a simple nuclear statistical equilibrium model neglecting continuum correlations and medium effects is not able to describe the measured distribution of H and He isotopes. Moreover, the freeze-out concept may serve as an important ingredient to the nonequilibrium approach using the relevant statistical operator concept.

    nucl-thEPJA(2020)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE