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21 results on '"Sailaubekov, B."'

2. 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
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3. 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
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4. 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

5. 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
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6. 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
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9. 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
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10. 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
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11. Fission hindrances in transfermium nuclei

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
Physics, QC1-999
Abstract

Very heavy nuclei owe their stability against spontaneous fission to quantum shell effects, which depend on the local density of single-particle states. The height but also the width and the structure of the barrier in multi-dimensional deformation space determine the fission half-lives. Other effects come into play, such as the conservation of quantum numbers and superfluidity or stiffness of the system in the fission process. This is why odd nuclei have longer fission partial half-lives with respect to their even neighbours and also why multi-quasi-particle states, such as high-K states, are thought to be more stable against fission than the ground state. We will report here on two different fission studies carried out with the GABRIELA detector array at the focal plane of the recoil separator SHELS. The first study concerns the fission properties of 253Rf, the most neutron deficient Rf isotope known to date. The second study focusses on a new measurement of the fission hindrance of the known 8- isomer in 254No.

Published
2023
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12. 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
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13. Structure of the prompt neutron multiplicity distribution in the spontaneous fission of 256Rf

Author

Isaev, A.V., primary, Mukhin, R.S., additional, Andreev, A.V., additional, Asfari, Z., additional, Chelnokov, M.L., additional, Chepigin, V.I., additional, Devaraja, H.M., additional, Dorvaux, O., 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, Yeremin, A.V., additional, and Zamyatin, N.I., additional

Published
2023
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14. Structure of the prompt neutron multiplicity distribution in the spontaneous fission of Rf

Author

Isaev, A.V., Mukhin, R.S., Andreev, A.V., Asfari, Z., 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., Rahmatinejad, A., Sailaubekov, B., Shneidman, T.M., Sokol, E.A., Svirikhin, A.I., Tezekbayeva, M.S., Yeremin, A.V., and Zamyatin, N.I.

Abstract

An experimental study of $^{256}$Rf spontaneous fission following the fusion reaction of $^{50}$Ti+$^{208}$Pb was performed using the velocity filter SHELS of the Flerov laboratory at JINR. The average number of neutrons of ν‾=4.30±0.17 and variance of σν2=3.2 from the prompt neutron multiplicity distribution were obtained. The alpha decay branching ratio of bα=0.003−0.003+0.005 and the half-life of T1/2=(6.7±0.2) ms of the isotope were determined. For the first time, our neutron detector system allowed us to extend investigation of the prompt neutron multiplicity study to the superheavy element region.

Published
2023

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
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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
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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
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18. Prototype of the Digital Electronics Chain for the GABRIELA Detector Assembly and First Tests

Author

Mukhin, R.S., Yeremin, A.V., Izosimov, I.N., Isaev, A.V., Kuznetsova, A.A., Malyshev, O.N., Popeko, A.G., Popov, Y.A., Sailaubekov, B., Svirikhin, A.I., Sokol, E.A., Tezekbayeva, M.S., Chelnokov, M.L., Chepigin, V.I., Hauschild, K., Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Radiation, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, 0103 physical sciences, Radiology, Nuclear Medicine and imaging, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 01 natural sciences, Atomic and Molecular Physics, and Optics, 010305 fluids & plasmas
Abstract

International audience; This paper describes a digital electronics chain prototype for the GABRIELA detector assembly. The goal of the digital algorithm is to reduce the dead time of the electronics to tens of nanoseconds without loss of energy and time resolution. The structure and temporal diagrams of the algorithm are given in the text. The paper also shows the energy resolution of the algorithm in comparison with the existing analog system and the results of the first in beam run.

Published
2021

19. Digital Signal Processing for the GABRIELA Detector Assembly

Author

Mukhin, R.S., primary, Yeremin, A.V., additional, Izosimov, I.N., additional, Isaev, A.V., additional, Kuznetsova, A.A., additional, Malyshev, O.N., additional, Popeko, A.G., additional, Popov, Yu.A., additional, Sailaubekov, B., additional, Svirikhin, A.I., additional, Sokol, E.A., additional, Tezekbayeva, M.S., additional, Chelnokov, M.L., additional, Chepigin, V.I., additional, and Hauschild, K., additional

Published
2021
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20. Study of Spontaneous Fission Using the SFiNx System

Author

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

Published
2021
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21. 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
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