Title: Light element ($$Z=1,2$$) production from spontaneous ternary fission of $$$$^{252}$$$$Cf

Abstract

Abstract The yields of light elements ( $$Z=1,2$$ $Z=1,2$ ) obtained from spontaneous ternary fission of $$$$^{252}$$$$ ${}^{252}$ 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 such as Pauli blocking which is determined by the nucleon density. 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.

Authors:

Röpke, G.; Natowitz, J. B.; Pais, H.

Publication Date:

2020-09-25

Sponsoring Org.:

USDOE

OSTI Identifier:

1665929

Grant/Contract Number:  

FG03-93ER40773

Resource Type:

Published Article

Journal Name:

European Physical Journal. A

Additional Journal Information:

Journal Name: European Physical Journal. A Journal Volume: 56 Journal Issue: 9; Journal ID: ISSN 1434-6001

Publisher:

Springer Science + Business Media

Country of Publication:

Germany

Language:

English