Персона:
Григоренко, Леонид Валентинович

Организационные подразделения

Организационная единица

Институт лазерных и плазменных технологий

Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.

Фамилия

Григоренко

Имя

Леонид Валентинович

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Результаты поиска

Теперь показываю 1 - 10 из 26

Только метаданные
Design and Performance of the ACCULINNA-2 Fragment-Separator
(2024) Krupko, S. A.; Belogurov, S. G.; Bezbakh, A. A.; Fomichev, A. S.; Grigorenko, L. V.; Белогуров, Сергей Геннадьевич; Григоренко, Леонид Валентинович
Открытый доступ
Current status of the new fragment separator Acculinna-2 and the first-day experiments
(2019) Gorshkov, A. V.; Belogurov, S. G.; Bezbakh, A. A.; Biare, D.; Grigorenko, L. V.; Григоренко, Леонид Валентинович
© 2019. All Rights Reserved.The commissioning of the new fragment separator Acculinna-2 at FLNR JINR is accomplished. The separator is destined to expand the possibilities in studies of dripline nuclei performed with the exotic secondary radioactive ion beams (RIBs) at energies of (5 – 50) AMeV. The projected high transmission and purification level were confirmed experimentally for a number of RIBs in the last two years. The Acculinna-2 setup will become a backbone facility at Flnr for the research in the field of light exotic nuclei. This report shows the current status of the separator, describes the obtained RIBs parameters and first experiments as well, provides the overview of the developing detection, monitoring and control subsystems.
Только метаданные
Detailed Study of External Correlations in the Low-Energy Spectrum of Beryllium-6
(2019) Chudoba, V.; Fomichev, A. S.; Bezbakh, A. A.; Egorova, I. A.; Grigorenko, L. V.; Григоренко, Леонид Валентинович
© 2019, Allerton Press, Inc.Abstract: Three-body continuum p-p-α for the charge exchange reaction 1H(6Li,6Be)n is studied in detail. The data are obtained with a high volume of statistics (approximately 4.7 million events), making it possible to analyze three-particle correlations. Detailed information about the structure of 6Ве and the reaction is obtained as a result.
Только метаданные
Neutron versus proton scattering on exotic nuclei: The He 9 example
(2025) Khirk, M. S.; Grigorenko, L. V.; Lanskoy, D. E.; Sharov, P. G.; Григоренко, Леонид Валентинович
Открытый доступ
Isospin Symmetry Breaking Disclosed in the Decay of Three-Proton Emitter
(2025) Xu, X.-D.; Mukha, I.; Li, J. G.; Wang, S. M.; Grigorenko, L. V.; Григоренко, Леонид Валентинович
Только метаданные
Towards the Limits of Existence of Nuclear Structure: Observation and First Spectroscopy of the Isotope K-31 by Measuring Its Three-Proton Decay
(2019) Kostyleva, D.; Mukha, I.; Acosta, L.; Casarejos, E.; Grigorenko, L. V.; Григоренко, Леонид Валентинович
The most remote isotope from the proton dripline (by 4 atomic mass units) has been observed: K-31. It is unbound with respect to three-proton (3p) emission, and its decays have been detected in flight by measuring the trajectories of all decay products using microstrip detectors. The 3p emission processes have been studied by the means of angular correlations of S-28 + 3p and the respective decay vertices. The energies of the previously unknown ground and excited states of K-31 have been determined. This provides its 3p separation energy value S-3p of -4.6(2) MeV. Upper half-life limits of 10 ps of the observed K-31 states have been derived from distributions of the measured decay vertices.
Только метаданные
Detection of the Low Energy Recoil 3He in the Reaction 2H(8He,3He)7H
(2020) Muzalevskii, I. A.; Chudoba, V.; Bezbakh, A. A.; Biare, D.; Belogurov, S. G.; Grigorenko, L. V.; Белогуров, Сергей Геннадьевич; Григоренко, Леонид Валентинович
© 2020, Allerton Press, Inc.Abstract: Investigation of the 7H-system in the experiment conducted at the fragment separator ACCULINNA-2 in the 8He(2H,3He)7H reaction requires to detect the recoil 3He ions with energy down to 6 MeV. For this purpose two ∆ E-E particle telescopes are used, with each telescope having in front a thin (20-μm) Si strip detector (∆E-SSD). The maps of thickness heterogeneity of the thin detectors were determined by measuring the energy losses of the 226Ra α-particles. The adopted thickness normalization method provides a good identification of the 3He nuclei being recorded in the presence of a high 4He background. Two approaches were used for calculating the energy losses of the identified 3He and 4He reaction ejectiles and reconstructing their energy values available at the exit from the deuterium target. The developed techniques were applied for the 7H missing-mass reconstruction.
Только метаданные
Pauli-principle Driven Correlations in Four-neutron Nuclear Decays
(2019) Sharov, P. G.; Ismailova, A. N.; Zhukov, M. V.; Grigorenko, L. V.; Григоренко, Леонид Валентинович
© 2019, Pleiades Publishing, Inc.Mechanism of simultaneous non-sequential four-neutron (4n) emission (or “true” 4n-decay) has been considered in phenomenological five-body approach. This approach is analogous to the model of the direct decay to the continuum often applied to 2n-and 2p-decays. It is demonstrated that 4n-decay fragments should have specific energy and angular correlations reflecting strong spatial correlations of “valence” nucleons orbiting in their 4n-precursors. Due to the Pauli exclusion principle, the valence neutrons are pushed to the symmetry-allowed configurations in the 4n-precursor structure, which causes a “Pauli focusing” effect. Prospects of the observation of the Pauli focusing have been considered for the 4n-precursors 7Hand 28 O. Fingerprints of their nuclear structure or/and decay dynamics are predicted.
Только метаданные
Study of Proton and Deuteron Pickup Reactions and with 44 MeV Be Radioactive Beam at ACCULINNA-2 Fragment Separator
(2023) Nikolskii, E. Y.; Krupko, S. A.; Muzalevskii, I. A.; Bezbakh, A. A.; Belogurov, S. G.; Grigorenko, L. V.; Белогуров, Сергей Геннадьевич; Григоренко, Леонид Валентинович
Только метаданные
Validity of Quasi-classical Approaches to True Three-Body Decays
(2020) Sukhareva, O. M.; Kostyleva, D. A.; Zhukov, M. V.; Grigorenko, L. V.; Григоренко, Леонид Валентинович
© Springer Nature Switzerland AG 2020.Within the hyperspherical harmonics (HH) method the three-body problem is reduced to a motion of one effective particle in a “strongly deformed” field, which is described in the coupled-channel formalism. This method is well suited to studies of so-called true three-body decays. The reduction of the hyperspherical equations set to a single-channel approximation provides the basis of standard quasi-classical (QC) expression for width evaluation. We demonstrate that by itself the quasi-classical approach is quite precise in application to typical three-body effective potentials. However, the reduction to a single channel leads to a significant overestimation of the width.