Energy distribution of ternary<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>α</mml:mi></mml:mrow></mml:math>particles in spontaneous fission of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Cf</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>252</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Mutterer, M.; Kopatch, Yu. N.; Yamaledtinov, S. R.; Lyapin, V. G.; Kalben, J. von; Khlebnikov, S. V.; Sillanpää, M.; Tyurin, G. P.; Trzaska, W. H.

doi:10.1103/physrevc.78.064616

Cited by 8 publications

(8 citation statements)

References 11 publications

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“…For each energy bin we employed the method suggested by K. H. Schmidt et al to explore decay time distributions [62]. For a given decaying nucleus the decay time distribution data is characterized by a universal function.…”

Section: Analysis and Experimental Resultsmentioning

confidence: 99%

Experimental survey of the production of α -decaying heavy elements in U238+Th232 reactions at 7.5–6.1 MeV/nu

et al. 2018

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The production of alpha particle decaying heavy nuclei in reactions of 7.5-6.1 MeV/nucleon 238 U + 232 Th has been explored using an in-beam detection array composed of YAP scintillators and gas ionization chamber-Si telescopes. Comparisons of alpha energies and half-lives for the observed products with those of the previously known isotopes and with theoretically predicted values indicate the observation of a number of previously unreported alpha emitters. Alpha particle decay energies reaching as high as 12 MeV are observed. Many of these are expected to be from decay of previously unseen relatively neutron rich products. While the contributions of isomeric states require further exploration and specific isotope identifications need to be made, the production of heavy isotopes with quite high atomic numbers is suggested by the data.

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Section: Analysis and Experimental Resultsmentioning

confidence: 99%

Experimental survey of the production of α -decaying heavy elements in U238+Th232 reactions at 7.5–6.1 MeV/nu

et al. 2018

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“…As pointed out in Ref. [29], experimental studies at low energy of ternary-particle-unstable nuclei producing α particles are still scarce, and the data are not very consistent. The ratio 6 He obs / 4 He obs was reconsidered in Ref.…”

Section: Experimental Datamentioning

confidence: 99%

“…The ratio 6 He obs / 4 He obs was reconsidered in Ref. [29], and a Gaussian fit above 9 MeV energy gives the value Y6 He obs /Y4 He obs = 0.041 (5).…”

Section: Experimental Datamentioning

confidence: 99%

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

2020

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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.

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“…However, to address the problem, precise experimental data are needed. Experimental studies are still scarce, and the data are often not consistent [31,32]. Unbound nuclei such as 5 He should be very sensitive to medium modifications.…”

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confidence: 99%

A Nonequilibrium Information Entropy Approach to Ternary Fission of Actinides

Röpke,

Natowitz,

Pais

2020

Preprint

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Ternary fission of actinides probes the state of the nucleus at scission. Light clusters are produced in space and time very close to the scission point. Within the nonequilibrium statistical operator method, a generalized Gibbs distribution is constructed from the information given by the observed yields of isotopes. Using this relevant statistical operator, yields are calculated taking excited states and continuum correlations into account, in accordance with the virial expansion of the equation of state. Clusters with mass number A ≤ 10 are well described using the nonequilibrium generalizations of temperature and chemical potentials. Improving the virial expansion, in-medium effects may become of importance in determining the contribution of weakly bound states and continuum correlations to the intrinsic partition function. Yields of larger clusters, which fail to reach this quasi-equilibrium form of the relevant distribution, are described by nucleation kinetics, and a saddle-to-scission relaxation time of about 7000 fm/c is inferred. Light charged particle emission, described by reaction kinetics and virial expansions, may therefore be regarded as a very important tool to probe the nonequilibrium time evolution of actinide nuclei during fission.

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Energy distribution of ternaryαparticles in spontaneous fission ofCf252

Cited by 8 publications

References 11 publications

Experimental survey of the production of α -decaying heavy elements in U238+Th232 reactions at 7.5–6.1 MeV/nu

Experimental survey of the production of α -decaying heavy elements in U238+Th232 reactions at 7.5–6.1 MeV/nu

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

A Nonequilibrium Information Entropy Approach to Ternary Fission of Actinides

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