Search

Your search keyword '"Mukhin, R."' showing total 30 results
Start Over Author "Mukhin, R."
30 results on '"Mukhin, R."'

1. Prompt neutron multiplicity from spontaneous fission of 244Fm

Author

Mukhin, R. S., Isaev, A. V., Ulanova, I. I., Svirikhin, A. I., Bychkov, M. A., Chelnokov, M. L., Chepigin, V. I., Devaraja, H. M., Dorvaux, O., Gall, B., Hauschild, K., Izosimov, I. N., Kuznetsova, A. A., Lopez-Martens, A., Malyshev, O. N., Popeko, A. G., Popov, Yu. A., Sailaubekov, B., Sokol, E. A., Tezekbayeva, M. S., Zamyatin, N. I., and Yeremin, A. V.

Published
2024
Full Text
View/download PDF

3. Analysis of the shape of multiplicity distributions of prompt neutrons emitted in spontaneous fission

Author

Mukhin, R. S., Isaev, A. V., Andreev, A. V., Chelnokov, M. L., Chepigin, V. I., Devaraja, H. M., Gall, B., Hauschild, K., Izosimov, I. N., Kuznetsova, A. A., Lopez-Martens, A., Malyshev, O. N., Popeko, A. G., Popov, Yu. A., Rahmatinejad, A., Sailaubekov, B., Shneidman, T. M., Sokol, E. A., Svirikhin, A. I., Tezekbayeva, M. S., and Yeremin, A. V.

Published
2024
Full Text
View/download PDF

4. Study of the production and decay properties of neutron-deficient nobelium isotopes

Author

Tezekbayeva, M. S., Yeremin, A. V., Svirikhin, A. I., Lopez-Martens, A., Chelnokov, M. L., Chepigin, V. I., Isaev, A. V., Izosimov, I. N., Karpov, A. V., Kuznetsova, A. A., Malyshev, O. N., Mukhin, R. S., Popeko, A. G., Popov, Yu. A., Rachkov, V. A., Sailaubekov, B. S., Sokol, E. A., Hauschild, K., Jacob, H., Chakma, R., Dorvaux, O., Forge, M., Gall, B., Kessaci, K., Andel, B., Antalic, S., Bronis, A., and Mosat, P.

Subjects
Nuclear Experiment
Abstract

The new neutron-deficient isotope $^{249}$No was synthesized for the first time in the fusion-evaporation reaction $^{204}$Pb($^{48}$Ca,3n)$^{249}$No. After separation, using the kinematic separator SHELS, the new isotope was identified with the GABRIELA detection system through genetic correlations with the known daughter and granddaughter nuclei $^{245}$Fm and $^{241}$Cf. The alpha-decay activity of $^{249}$No has an energy of 9129(22)$~$keV and half-life 38.3(2.8) ms. An upper limit of 0.2\% was measured for the fission branch of $^{249}$No. Based on the present data and recent information on the decay properties of $^{253}$Rf and aided by Geant4 simulations, the ground state of $^{249}$No is assigned the 5/2$^+$[622] neutron configuration and a partial decay scheme from $^{253}$Rf to $^{245}$Fm could be established. The production cross-section was found to be $\sigma$(3n)=0.47(4) nb at a mid-target beam energy of 225.4 MeV, which corresponds to the maximum of the calculated excitation function. Correlations of the $^{249}$No alpha activity with subsequent alpha decays of energy 7728(20) keV and half-life $1.2_{-0.4}^{+1.0}$ min provided a firm measurement of the electron-capture or $\beta^{+}$ branch of $^{245}$Fm to $^{245}$Es. The excitation function for the 1n, 2n and 3n evaporation channels was measured. In the case of the 2n-evaporation channel $^{250}$No, a strong variation of the ground state and isomeric state populations as a function of bombarding energy could be evidenced.

Published
2022
Full Text
View/download PDF

5. Spontaneous fission of 246Fm

Author

Isaev, A. V., Mukhin, R. S., Andreev, A. V., Bychkov, M. A., Chelnokov, M. L., Chepigin, V. I., Devaraja, H. M., Dorvaux, O., Forge, M., Gall, B., Hauschild, K., Izosimov, I. N., Kessaci, K., Kuznetsova, A. A., Lopez-Martens, A., Malyshev, O. N., Popeko, A. G., Popov, Yu. A., Rahmatinejad, A., Sailaubekov, B., Shneidman, T. M., Sokol, E. A., Svirikhin, A. I., Testov, D. A., Tezekbayeva, M. S., Yeremin, A. V., Zamyatin, N. I., and Zhumadilov, K. Sh.

Subjects
Nuclear Experiment
Abstract

An experiment on the study of the $^{246}$Fm spontaneous fission was conducted using the SHELS separator. The isotope was synthesized in the complete fusion reaction of $^{40}$Ar beam ions and $^{208}$Pb target nuclei. The neutron yields of $^{246}$Fm spontaneous fission ($\overline{\nu} = 3.79\pm0.30$, $\sigma^{2}_{\nu} = 2.1$) were obtained using the SFiNx detector system. The multiplicity distribution of emitted prompt neutrons was restored using the Tikhonov method of statistical regularisation ($\overline{\nu}_{r} = 3.79\pm0.20$, $\sigma^{2}_{\nu r} = 2.8$). The spontaneous fission branching ratio ($b_{SF} = 0.061\pm0.005$) and the half-life ($T_{1/2} = 1.50^{+0.08}_{-0.07}$ s) of the isotope were determined. The experimental data were compared with scission point model predictions. Excellent convergence was observed in the average number of neutrons per spontaneous fission process. However, the forms of the experimental and model prompt neutron multiplicity distributions differ significantly.

Published
2022

6. Fission properties of $^{253}$Rf and the stability of neutron-deficient Rf isotopes

Author

Lopez-Martens, A., Hauschild, K., Svirikhin, A. I., Asfari, Z., Chelnokov, M. L., Chepigin, V. I., Dorvaux, O., Forge, M., Gall, B., Isaev, A. V., Izosimov, I. N., Kessaci, K., Kuznetsova, A. A., Malyshev, O. N., Mukhin, R. S, Popeko, A. G., Popov, Yu. A., Sailaubekov, B., Sokol, E. A., Tezekbayeva, M. S., and Yeremin, A. V.

Subjects
Nuclear Experiment
Abstract

An analysis of recent experimental data [J. Khuyagbaatar et al., Phys. Rev. C 104, L031303 (2021)] has established the existence of two fissioning states in $^{253}$Rf: the ground state and a low-lying isomeric state, most likely involving the same neutron single-particle configurations as in the lighter isotone $^{251}$No. The ratio of fission half-lives measured in $^{253}$Rf was used to predict the fission properties of the 1/2$^{+}$ isomeric state in $^{251}$No and draw conclusions as to the stability against fission of even lighter Rf systems. This paper focusses again on the fission properties of $^{253}$Rf and their impact on the stability of other neutron deficient isotopes, using new and improved data collected from two experiments performed at the Flerov Laboratory of Nuclear Reactions in Dubna, Russia. Two fission activities with half-lives of 52.8(4.4)$~\mu$s and 9.9(1.2) ms were measured in the case of $^{253}$Rf, confirming the results of J. Kkuyagbaatar et al. A third state, at much higher excitation energy, was also observed through the detection of its electromagnetic decay to the 52.8$~\mu$s state. This observation leads to the opposite quantum-configuration assignments for the fissioning states as compared to the ones established by J. Khuyagbaatar et al., namely that the higher-spin state has the shortest fission half-life. This inversion of the ratio of fission hindrances between the low and high-spin states is corroborated in the isotone $^{251}$No by the non observation of any substantial fission branch from the low-spin isomer.

Published
2022
Full Text
View/download PDF

7. The SFiNx Detector System

Author

Isaev, A. V., Yeremin, A. V., Zamyatin, N. I., Izosimov, I. N., Kuznetsova, A. A., Malyshev, O. N., Mukhin, R. S., Popeko, A. G., Popov, Yu. A., Sailaubekov, B., Svirikhin, A. I., Sokol, E. A., Tezekbayeva, M. S., Testov, D. A., Chelnokov, M. L., Chepigin, V. I., Antalic, S., Mosat, P., Brionnet, P., Gall, B., Dorvaux, O., Kessaci, K., Sellam, A., Lopez-Martens, A., and Hauschild, K.

Published
2022
Full Text
View/download PDF

10. Comparative Study of Spontaneous-Fission Characteristics of 252No and 254No Isotopes

Author

Isaev, A. V., Andreev, A. V., Chelnokov, M. L., Chepigin, V. I., Izosimov, I. N., Kuznetsova, A. A., Malyshev, O. N., Mukhin, R. S., Popeko, A. G., Popov, Y. A., Shneidman, T. M., Sokol, E. A., Svirikhin, A. I., Tezekbayeva, M. S., Yeremin, A. V., Zamyatin, N. I., Brionnet, P., Dorvaux, O., Gall, B., Kessaci, K., Sellam, A., Hauschild, K., Lopez-Martens, A., Antalic, S., and Mosat, P.

Published
2021
Full Text
View/download PDF

11. The New 249No Isotope

Author

Svirikhin, A. I., Yeremin, A. V., Zamyatin, N. I., Izosimov, I. N., Isaev, A. V., Kuznetsova, A. A., Malyshev, O. N., Mukhin, R. S., Popeko, A. G., Popov, Y. A., Sokol, E. A., Sailaubekov, B., Tezekbayeva, M. S., Chelnokov, M. L., Chepigin, V. I., Andel, B., Antalic, S., Bronis, A., Mosat, P., Gall, B., Dorvaux, O., Lopez-Martens, A., and Hauschild, K.

Published
2021
Full Text
View/download PDF

13. Prompt neutron emission in the spontaneous fission of 246Fm

Author

Isaev, A. V., Mukhin, R. S., Andreev, A. V., Bychkov, M. A., Chelnokov, M. L., Chepigin, V. I., Devaraja, H. M., Dorvaux, O., Forge, M., Gall, B., Hauschild, K., Izosimov, I. N., Kessaci, K., Kuznetsova, A. A., Lopez-Martens, A., Malyshev, O. N., Popeko, A. G., Popov, Yu. A., Rahmatinejad, A., Sailaubekov, B., Shneidman, T. M., Sokol, E. A., Svirikhin, A. I., Testov, D. A., Tezekbayeva, M. S., Yeremin, A. V., Zamyatin, N. I., and Zhumadilov, K. Sh.

Published
2022
Full Text
View/download PDF

14. Analysis of the shape of multiplicity distributions of prompt neutrons emitted in spontaneous fission

Author

Mukhin, R. S., primary, Isaev, A. V., additional, Andreev, A. V., additional, Chelnokov, M. L., additional, Chepigin, V. I., additional, Devaraja, H. M., additional, Gall, B., additional, Hauschild, K., additional, Izosimov, I. N., additional, Kuznetsova, A. A., additional, Lopez-Martens, A., additional, Malyshev, O. N., additional, Popeko, A. G., additional, Popov, Yu. A., additional, Rahmatinejad, A., additional, Sailaubekov, B., additional, Shneidman, T. M., additional, Sokol, E. A., additional, Svirikhin, A. I., additional, Tezekbayeva, M. S., additional, and Yeremin, A. V., additional

Published
2023
Full Text
View/download PDF

15. Prompt neutron emission in the spontaneous fission of $$^{246}$$Fm

Author

Isaev, A. V., primary, Mukhin, R. S., additional, Andreev, A. V., additional, Bychkov, M. A., additional, Chelnokov, M. L., additional, Chepigin, V. I., additional, Devaraja, H. M., additional, Dorvaux, O., additional, Forge, M., additional, Gall, B., additional, Hauschild, K., additional, Izosimov, I. N., additional, Kessaci, K., additional, Kuznetsova, A. A., additional, Lopez-Martens, A., additional, Malyshev, O. N., additional, Popeko, A. G., additional, Popov, Yu. A., additional, Rahmatinejad, A., additional, Sailaubekov, B., additional, Shneidman, T. M., additional, Sokol, E. A., additional, Svirikhin, A. I., additional, Testov, D. A., additional, Tezekbayeva, M. S., additional, Yeremin, A. V., additional, Zamyatin, N. I., additional, and Zhumadilov, K. Sh., additional

Published
2022
Full Text
View/download PDF

16. Study of the production and decay properties of neutron-deficient nobelium isotopes

Author

Tezekbayeva, M. S., primary, Yeremin, A. V., additional, Svirikhin, A. I., additional, Lopez-Martens, A., additional, Chelnokov, M. L., additional, Chepigin, V. I., additional, Isaev, A. V., additional, Izosimov, I. N., additional, Karpov, A. V., additional, Kuznetsova, A. A., additional, Malyshev, O. N., additional, Mukhin, R. S., additional, Popeko, A. G., additional, Popov, Yu. A., additional, Rachkov, V. A., additional, Sailaubekov, B. S., additional, Sokol, E. A., additional, Hauschild, K., additional, Jacob, H., additional, Chakma, R., additional, Dorvaux, O., additional, Forge, M., additional, Gall, B., additional, Kessaci, K., additional, Andel, B., additional, Antalic, S., additional, Bronis, A., additional, and Mosat, P., additional

Published
2022
Full Text
View/download PDF

17. Fission properties of Rf253 and the stability of neutron-deficient Rf isotopes

Author

Lopez-Martens, A., primary, Hauschild, K., additional, Svirikhin, A. I., additional, Asfari, Z., additional, Chelnokov, M. L., additional, Chepigin, V. I., additional, Dorvaux, O., additional, Forge, M., additional, Gall, B., additional, Isaev, A. V., additional, Izosimov, I. N., additional, Kessaci, K., additional, Kuznetsova, A. A., additional, Malyshev, O. N., additional, Mukhin, R. S., additional, Popeko, A. G., additional, Popov, Yu. A., additional, Sailaubekov, B., additional, Sokol, E. A., additional, Tezekbayeva, M. S., additional, and Yeremin, A. V., additional

Published
2022
Full Text
View/download PDF

20. Evidence of high- K isomerism in No154102256

Author

Kessaci, K., primary, Gall, B. J. P., additional, Dorvaux, O., additional, Lopez-Martens, A., additional, Chakma, R., additional, Hauschild, K., additional, Chelnokov, M. L., additional, Chepigin, V. I., additional, Forge, M., additional, Isaev, A. V., additional, Izosimov, I. N., additional, Katrasev, D. E., additional, Kuznetsova, A. A., additional, Malyshev, O. N., additional, Mukhin, R., additional, Piot, J., additional, Popeko, A. G., additional, Popov, Yu. A., additional, Sokol, E. A., additional, Svirikhin, A. I., additional, Tezekbayev, M. S., additional, and Yeremin, A. V., additional

Published
2021
Full Text
View/download PDF

22. Evidence of high-$K$ isomerism in $_{102}^{256}\mathrm{No}_{154}$

Author

Kessaci, K., Gall, B.J.P., Dorvaux, O., Lopez-Martens, A., Chakma, R., Hauschild, K., Chelnokov, M.L., Chepigin, V.I., Forge, M., Isaev, A.V., Izosimov, I.N., Katrasev, D.E., Kuznetsova, A.A., Malyshev, O.N., Mukhin, R., Piot, J., Popeko, A.G., Popov, Yu.A., Sokol, E.A., Svirikhin, A.I., Tezekbayev, M.S., Yeremin, A.V., Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; Isomeric states in No256 were investigated using internal conversion electron and γ-ray spectroscopy with the GABRIELA detection system at the focal plane of the SHELS recoil separator, at the Flerov Laboratory for Nuclear Research (FLNR, JINR, Dubna). The nuclei of interest were produced using the highly asymmetric fusion-evaporation reaction U238(Ne22,4n)No256. The emission of internal conversion electrons and γ rays occurring between a No256 implantation and a subsequent α-decay event were studied, resulting in the observation of high-K isomerism in this nobelium isotope. The nature of the isomeric states is discussed in terms of possible two- and four-quasiparticle structures.

Published
2021
Full Text
View/download PDF

24. Comparative Study of Spontaneous-Fission Characteristics of 252No and 254No Isotopes.

Author

Isaev, A. V., Andreev, A. V., Chelnokov, M. L., Chepigin, V. I., Izosimov, I. N., Kuznetsova, A. A., Malyshev, O. N., Mukhin, R. S., Popeko, A. G., Popov, Y. A., Shneidman, T. M., Sokol, E. A., Svirikhin, A. I., Tezekbayeva, M. S., Yeremin, A. V., Zamyatin, N. I., Brionnet, P., Dorvaux, O., Gall, B., and Kessaci, K.

Abstract

Spontaneous fissions of the 252No and 254No nobelium isotopes have been studied in a series of experiments with the SHELS separator. These isotopes are produced by colliding a beam of 48Ca ions from the U-400 cyclotron with the 206Pb and 208Pb targets. The measured characteristics of the 252No and 254No spontaneous fissions include their half-lives, total kinetic energies of fission fragments, and prompt-neutron multiplicities. The average number of neutrons per 254No spontaneous-fission act is measured for the first time as 4.88 ± 0.53. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

25. The New 249No Isotope.

Author

Svirikhin, A. I., Yeremin, A. V., Zamyatin, N. I., Izosimov, I. N., Isaev, A. V., Kuznetsova, A. A., Malyshev, O. N., Mukhin, R. S., Popeko, A. G., Popov, Y. A., Sokol, E. A., Sailaubekov, B., Tezekbayeva, M. S., Chelnokov, M. L., Chepigin, V. I., Andel, B., Antalic, S., Bronis, A., Mosat, P., and Gall, B.

Abstract

In the reaction of complete fusion of 48Ca-ions with a 204Pb target, a new α line, related to the decay of a new, previously unknown isotope (249No), has been detected in an experiment carried out at the SHELS separator. The α decay energy (Eα = 9129 keV) and the half-life (T1/2 = 38.1 ± 2.5 ms) are measured using the GABRIELA detector array. The SF branching ratio was estimated (bSF ≤ 0.2%). [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

28. Intensification of heat exchange by application of nano-modified galvanic coatings to heat-emitting surfaces.

Author

Litovka, Yu., Tugolukov, E., Tkachev, A., Diakov, I., Gravin, A., and Mukhin, R.

Subjects
AGRICULTURAL intensification, ELECTROLYTIC corrosion, COATING processes, SURFACES (Technology), THIN films
Abstract

Basic criteria for improvement in the level of heat emission are examined. The expediency of use of nanodisperse materials to achieve the stated goal and reveal positive results of their use is substantiated in detail. Two hypotheses for the development of the effect in question are experimentally confirmed. [ABSTRACT FROM AUTHOR]

Published
2012
Full Text
View/download PDF

29. Evolution of fission properties in Fermium region.

Author

Rahmatinejad, A., Andreev, A. V., Bezbakh, A. N., Isaev, A. V., Mukhin, R. S., and Shneidman, T. M.

Subjects
*NEUTRON multiplicity, *HEAVY nuclei, *ISOTOPES
Abstract

In this paper, we model the fission process by assuming that at certain elongation, after crossing the fission barrier, a fissile nucleus can be treated as a superposition of dinuclear systems (DNS). The distribution of primary fission fragments is described as a result of competition between evolution of initially formed DNS and its decay in relative distance. The level densities required for the calculations were microscopically derived accounting for deformation and excitation energy effects. The calculations performed for even 244−260Fm isotopes give overall good description of mass and neutron multiplicity distributions. To describe sudden onset of symmetric fission in 258Fm, the fissile nucleus is treated as superposition of DNS at smaller elongations than for lighter Fm isotopes, which is in line with significant reduction of half-life for 258Fm. Our results indicate the presence of bimodality due to coexistence of spherical and deformed mass symmetric fission modes. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

30. scTab: Scaling cross-tissue single-cell annotation models.

Author

Fischer F, Fischer DS, Mukhin R, Isaev A, Biederstedt E, Villani AC, and Theis FJ

Subjects
Humans, RNA-Seq methods, Machine Learning, Neural Networks, Computer, Transcriptome, Sequence Analysis, RNA methods, Animals, Computational Biology methods, Deep Learning, Gene Expression Profiling methods, Algorithms, Single-Cell Analysis methods
Abstract

Identifying cellular identities is a key use case in single-cell transcriptomics. While machine learning has been leveraged to automate cell annotation predictions for some time, there has been little progress in scaling neural networks to large data sets and in constructing models that generalize well across diverse tissues. Here, we propose scTab, an automated cell type prediction model specific to tabular data, and train it using a novel data augmentation scheme across a large corpus of single-cell RNA-seq observations (22.2 million cells). In this context, we show that cross-tissue annotation requires nonlinear models and that the performance of scTab scales both in terms of training dataset size and model size. Additionally, we show that the proposed data augmentation schema improves model generalization. In summary, we introduce a de novo cell type prediction model for single-cell RNA-seq data that can be trained across a large-scale collection of curated datasets and demonstrate the benefits of using deep learning methods in this paradigm., (© 2024. The Author(s).)

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results