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Maslyuk, V. T.; Парлаг, О. О.; Lendyel, O. I.; Marynets, T.I.; Romanyuk, M. I.; Shevchenko, О.; Ranyuk, Ju.Ju.; Dovbnya, A.M.

doi:10.1016/j.nuclphysa.2016.05.002

Cited by 5 publications

(6 citation statements)

References 18 publications

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“…Therefore, for the problems of cluster radioactivity, it is interesting to investigate probabilities of the yield of heavy nuclei fission fragments and to establish influence factors. Such a task can be solved in the frame of after-fission approximation when particular characteristics of mass or charge distributions are determined according to the character of the thermodynamic ordering of the nucleus fission products [12]. Figure 1 demonstrates the dependences of probabilities, P, of the yields of different fission fragments with the atomic number Z i .…”

Section: Cluster Radioactivity: From Tunneling To Spontaneous Nucleus Fissionmentioning

confidence: 99%

“…Investigation of these processes gives information about the stability of nuclear matter, the role of shell corrections, and also about the peculiarities of nucleons interaction in a nucleus. The last characteristics is especially crucial for explaining the cluster model of the nucleus [1], when, in addition to alpha particles, more complex nuclear fragments, such as 12,14 С, 20 О can be emitted [2,3]. There are even molecular models of a nucleus [1], which analyzed the nature and possibilities for realization † † in the nucleus the cluster structures with different dimensionality.…”

Section: Introductionmentioning

confidence: 99%

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On the Possibility to Detect Acts of Cluster Decay of Atomic Nuclei by the Methods of Noise Diagnostic

Skorbun¹,

Kuchmagra²,

Odinokin³

et al. 2020

Problems of Atomic Science and Technology

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Cluster decay, as a special type of radioactive decay, up to date, is widely investigated. Nevertheless, until now, this activity is restricted: from one side by the possibilities of theoretical analysis, where some success is obtained for light nuclei only; and from another side only by experiments for nuclei defragmentation in searching for fission on magic nuclei. However, standard methods of radiometry and statistical analysis have not yet been applied. Such possibility can be realized by searching for acts of cluster decay as a rare event on an array of alpha-decay acts of actinides, which are recorded by industrial ionization fission chambers. The scheme of the experiment is discussed, which consists in the registration of every act of alpha-decay, against the background of which it is possible to detect the presence of nuclear clusters based on isotopes of 12,14С, 20О, and others, which can be formed in the decay of 234,235U. The requirements for electronics and the background conditions for such an experiment are discussed in detail.

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Section: Cluster Radioactivity: From Tunneling To Spontaneous Nucleus Fissionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Possibility to Detect Acts of Cluster Decay of Atomic Nuclei by the Methods of Noise Diagnostic

Skorbun¹,

Kuchmagra²,

Odinokin³

et al. 2020

Problems of Atomic Science and Technology

Self Cite

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“…By using the thermodynamic methods to describe the fission of the nucleus, one requires taking into consideration the stochastic effects typical for small systems. The theoretical approach proposed in [12,13] studied the post-scission ensemble of nuclei, created by all fission fragments with the thermodynamic parameters such as temperature T and pressure P determined from the state of an original (fissile) nucleus. This approach did not require fitting parameters and was able to study the fission characteristics both of light (pre-actinides) and of superheavy nuclei.…”

mentioning

confidence: 99%

“…Theory. -The proposed method of the MCSFF determination was described earlier in [12,13,15]. It offered to consider the nucleus as some condensed state of nuclear matter whose binding energy is not additive on sort and number of nucleons.…”

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confidence: 99%

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The features of the fission fragments yields formation of the actinide nuclei on example of uranium isotopes

Maslyuk¹,

Парлаг²,

Romanyuk³

et al. 2017

EPL

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The first results about the features of the fission fragments yields and spectrum of the energy of fission over 100 isotopes of uranium are presented. The role of neutrons shells with N = 82 or N = 126 and protons shells with Z = 50 in the realization of symmetric (or onehumped) and asymmetric (2-or 3-humped) shapes of the fission fragment yields was investigated. It was shown that studies of Kr isotope yields under fission of uranium isotopes give also valuable information on the role of the mentioned nuclear shells, too. The obtained results can be useful in similar studies of other actinide nuclei.

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Review on the progress in nuclear fission—experimental methods and theoretical descriptions

2018

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An overview is given on some of the main advances in the experimental methods, experimental results, theoretical models and ideas of the last few years in the field of nuclear fission. New approaches have considerably extended the availability of fissioning systems for the experimental study of nuclear fission, and have provided a full identification of all fission products in A and Z for the first time. In particular, the transition from symmetric to asymmetric fission around Th, some unexpected structures in the mass distributions in the fission of systems around Z = 80-84, and an extended systematics of the odd-even effect in the fission fragment Z distributions have all been measured (Andreyev et al 2018 Rep. Prog. Phys. 81 016301). Three classes of model descriptions of fission presently appear to be the most promising or the most successful. Self-consistent quantum-mechanical models fully consider the quantum-mechanical features of the fission process. Intense efforts are presently being made to develop suitable theoretical tools (Schunck and Robledo 2016 Rep. Prog. Phys. 79 116301) for modeling the non-equilibrium, large-amplitude collective motion leading to fission. Stochastic models provide a fully developed technical framework. The main features of the fission-fragment mass distribution have been well reproduced from mercury to fermium and beyond (Möller and Randrup 2015 Phys. Rev. C 91 044316). However, limited computer resources still impose restrictions, for example, on the number of collective coordinates and on an elaborate description of the fission dynamics. In an alternative semi-empirical approach (Schmidt et al 2016 Nucl. Data Sheets 131 107), considerable progress in describing the fission observables has been achieved by combining several theoretical ideas, which are essentially well known. This approach exploits (i) the topological properties of a continuous function in multidimensional space, (ii) the separability of the influence of fragment shells and the macroscopic properties of the compound nucleus, (iii) the properties of a quantum oscillator coupled to a heat bath of other nuclear degrees of freedom, (iv) an early freeze-out of collective motion, and (v) the application of statistical mechanics for describing the thermalization of intrinsic excitations in the nascent fragments. This new approach reveals a high degree of regularity and allows the calculation of high-quality data that is relevant to nuclear technology without specifically adjusting the empirical data of individual systems.

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Calculation of the fission-fragment yields of the pre-actinide nuclei by the example of the Pbnat isotopes

Cited by 5 publications

References 18 publications

On the Possibility to Detect Acts of Cluster Decay of Atomic Nuclei by the Methods of Noise Diagnostic

On the Possibility to Detect Acts of Cluster Decay of Atomic Nuclei by the Methods of Noise Diagnostic

The features of the fission fragments yields formation of the actinide nuclei on example of uranium isotopes

Review on the progress in nuclear fission—experimental methods and theoretical descriptions

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