Персона:
Гуров, Юрий Борисович

Научные группы

Научная группа

Экзотические ядерные состояния (Кафедра №40)

Организационные подразделения

Организационная единица

Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.

Статус

Руководитель научной группы "Экзотические ядерные состояния"

Фамилия

Гуров

Имя

Юрий Борисович

Полная страница элемента

Результаты поиска

Теперь показываю 1 - 10 из 11

Только метаданные
The Neutron Structure of the Ground State of 7He
(2019) Demyanova, A. S.; Goncharov, S. A.; Ogloblin, A. A.; Sandukovsky, V. G.; Chernyshev, B. A.; Gurov, Y. B.; Lapushkin, S. V.; Чернышев, Борис Андреевич; Гуров, Юрий Борисович
© 2019, Pleiades Publishing, Inc.A study of the neutron structure of the ground state of 7He has been performed by means of registration and analysis of the decay channels of the residual nuclei following absorption of stopped pions. In particular, the reactions 9Be(π−, d)X and 11B(π−, dd)X have been investigated where X denotes any system with five neutrons and two protons — the constituencies of a 7He nucleus. The results point out to the existence of a halo-like configuration of the ground state of 7He with all three neutrons outside of the alpha particle core. The structure of this complicated halo-like state is determined by the correlations of neutrons in the p3/2 and p1/2 shells. The result would be in agreement with the previous works pointing out to a considerable mixing of configurations containing neutrons in the p3/2 and p1/2 states.
Только метаданные
8He Spectroscopy with Stopped-Pion Absorption by 12C and 14C
(2019) Gurov, Y. B.; Lapushkin, S. V.; Leonova, T. I.; Sandukovsky, V. G.; Chernyshev, B. A.; Гуров, Юрий Борисович; Леонова, Татьяна Игоревна; Чернышев, Борис Андреевич
© 2019, Allerton Press, Inc.Abstract: The structure of the levels of heavy helium isotope 8He is investigated using the reactions of stopped-pion absorption by carbon isotopes 12С(π−, p3He)X, 14С(π−, d4He)X, and 14С(π−, t3He)X. Measurements are made with the two-arm multilayer semiconductor spectrometer at the LANL accelerator. Excited states of the 8He nucleus with energies of excitation of up to ~ 20 MeV are sought using the measured missing-mass spectra for these reactions. An excited state with Ex ≈ 6.4 MeV and Г ≤ 1 MeV is observed for the first time. Its structure is probably due to two valence nucleons on the (1p1/2)2 shell.
Только метаданные
Charged Particle Production in Stopped Pion Absorption by Nuclei
(2019) Gurov, Y. B.; Karpukhin, V. S.; Lapushkin, S. V.; Leonova, T. I.; Pritula, R. V.; Chernyshev, B. A.; Sandukovsky, V. G.; Гуров, Юрий Борисович; Леонова, Татьяна Игоревна; Чернышев, Борис Андреевич
© 2019, Pleiades Publishing, Ltd.The spectra of 3,4He charged particles produced in stopped pion absorption by nuclei were measured for 17 nuclei in the mass-number range of 6 ≤ A ≤ 209 by means of a semiconductor spectrometer. These data were analyzed on the basis of a phenomenological model where the absorption reaction in question is treated as a three-stage process: primary absorption by intranuclear clusters, preequilibrium stage, and evaporation stage. It is shown that a dominant contribution to the production of helium isotopes with energies not less than 20 MeV comes from the preequilibrium stage. The contribution of the knockout and pickup mechanisms to 3,4He production is estimated.
Только метаданные
Searching for 9He upon the Absorption of Stopped Pions by 14C Nuclei
(2020) Gurov, Y. B.; Lapushkin, S. V.; Leonova, T. I.; Sandukovsky, V. G.; Chernyshev, B. A.; Гуров, Юрий Борисович; Леонова, Татьяна Игоревна; Чернышев, Борис Андреевич
© 2020, Allerton Press, Inc.Abstract: An experimental search is conducted for the formation of the heavy 9He isotope of helium upon the absorption of stopped pions by 14C nuclei. The structure of 9He levels in the missing mass spectra in reactions 14C(π–, p4He)Х and 14C(π–, d3He)Х is studied. A state with a high energy of excitation of 12.5 MeV and a state width of 1.5 MeV is detected for the first time. Suppression of the formation of ground state 9He in the considered reactions is established.
Только метаданные
Formation of the Heavy Isotope 6He upon Stopped Pion Absorption by Nuclei
(2020) Gurov, Y. B.; Lapushkin, S. V.; Leonova, T. I.; Tel'kushev, M. V.; Chernyshev, B. A.; Sandukovsky, V. G.; Гуров, Юрий Борисович; Леонова, Татьяна Игоревна; Чернышев, Борис Андреевич
© 2020, Pleiades Publishing, Ltd.A survey of experimental results on the level structure in the heavy heliumisotope 6He that were obtained in reactions induced by stopped pion absorption in 9Be, 10,11B, and 12C light nuclei is presented. The respective measurements were performed on the low-energy pion channel of the accelerator at the Los Alamos National Laboratory (LANL) by means of a two-arm semiconductor spectrometer. A high statistical significance of the results was attained over a broad excitation-energy range extending up to 40 MeV. Several highly excited states, including t + t cluster resonances, were revealed for the first time.
Только метаданные
Halo-like structure in 7He nucleus
(2020) Demyanova, A. S.; Ogloblin, A. A.; Goncharov, S. A.; Belyaeva, T. L.; Chernyshev, B. A.; Gurov, G. P.; Lapushkin, S. V.; Чернышев, Борис Андреевич; Гуров, Юрий Борисович
Только метаданные
Characteristics of semiconductor pion stop tagging system
(2020) Sandukovsky, V.; Chernyshev, B.; Gurov, Y.; Lapushkin, S.; Чернышев, Борис Андреевич; Гуров, Юрий Борисович
© Published under licence by IOP Publishing Ltd.A determination of the coordinates of charged particle stops is one of the tasks that have to be solved in a wide class of experiments. A method based on the use of semiconductor detectors (SCD) to determine the stops of particles (muons and pions) was proposed and experimentally tested. The dependence that allows calculating the stopping point of the pions in the tagging system was obtained experimentally. This dependence can be used to optimize the thickness values of monitor detectors.
Только метаданные
Selection of Events in the Absorption Reactions of pi(-)-Meson Nuclei
(2021) Gurov, Y. B.; Lapushkin, S. V.; Rozov, S. V.; Sandukovsky, V. G.; Chernyshev, B. A.; Гуров, Юрий Борисович; Чернышев, Борис Андреевич
A description of a procedure for selecting events during the absorption of stopped pions in thin targets is presented. This approach is based on the use of two monitor Si-detectors and a "live" target, which is also an Si-detector, as the last layers of the moderator. Setting the thresholds on monitor detectors and analyzing signals from a "live" target allow one to select pions with a residual range corresponding to the target thickness and reliably exclude the background from stops in the monitor system. It is shown that this method provides an efficiency of identifying stopped pi(-)-mesons of 90%.
Только метаданные
The spin-parities of the 13.35 MeV state and high-lying excited states around 20 MeV in 12 C nucleus
(2021) Demyanova, A.; Starastsin, V.; Ogloblin, A.; Danilov, A.; Gurov, Y.; Chernyshev, B.; Гуров, Юрий Борисович; Чернышев, Борис Андреевич
© 2021, The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature.A study of the 11B(3He,d)12C reaction at incident 3He energy E lab = 25 MeV has been performed at the K-130 cyclotron at the University of Jyväskylä, Finland. Differential cross sections have been measured for the 13.35 MeV state and for the states with excitation energy around 20 MeV in 12C. The data were analyzed with the DWBA method. A tentative assignment, 4-, is given for the state at 13.35 MeV in a joint study of the reaction and inelastic scattering of α-particles with the energy of 110 MeV. For the state at 20.98 MeV, the possible spin-parity 3- and the isospin T = 0 are assigned for the first time. Our model description of the broad state at 21.6 MeV is consistent with the previous assignments of isospin T = 0 and spin-parity of 2+ or 3-. The excited state at 22.4 MeV may have possible spin-parities of either 6+ or 5-. The collected statistics was insufficient to solve this question. Rotational bands which can exist in 12C were presented.
Только метаданные
Formation of 8He in the 9Be(π–, p)X and 10B(π–, pp)X Stopped Pion Absorption Reactions
(2021) Sandukovsky, V. G.; Gurov, Y. B.; Lapushkin, S. V.; Leonova, T. I.; Tel'kushev, M. V.; Chernyshev, B. А.; Гуров, Юрий Борисович; Леонова, Татьяна Игоревна; Чернышев, Борис Андреевич
© 2021, Pleiades Publishing, Inc.The structure of levels of the 8He heavy helium isotope has been studied in the 9Beπ and 10Bπ stopped pion absorption reactions. Measurements have been performed with a two-arm multilayer semiconductor spectrometer at the LANL. Indications to the existence of a soft dipole mode at the excitation energy E(X) MeV have been obtained. A state with a high excitation energy of 12.2(5) MeV has been observed for the first time.