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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:
; ;
Publication Date:
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

Citation Formats

Röpke, G., Natowitz, J. B., and Pais, H. Light element ($$Z=1,2$$) production from spontaneous ternary fission of $$^{252}$$Cf. Germany: N. p., 2020. Web. https://doi.org/10.1140/epja/s10050-020-00247-0.
Röpke, G., Natowitz, J. B., & Pais, H. Light element ($$Z=1,2$$) production from spontaneous ternary fission of $$^{252}$$Cf. Germany. https://doi.org/10.1140/epja/s10050-020-00247-0
Röpke, G., Natowitz, J. B., and Pais, H. Fri . "Light element ($$Z=1,2$$) production from spontaneous ternary fission of $$^{252}$$Cf". Germany. https://doi.org/10.1140/epja/s10050-020-00247-0.
@article{osti_1665929,
title = {Light element ($$Z=1,2$$) production from spontaneous ternary fission of $$^{252}$$Cf},
author = {Röpke, G. and Natowitz, J. B. and Pais, H.},
abstractNote = {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.},
doi = {10.1140/epja/s10050-020-00247-0},
journal = {European Physical Journal. A},
number = 9,
volume = 56,
place = {Germany},
year = {2020},
month = {9}
}

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