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
Только метаданные
FOUR-NEUTRON DECAY CORRELATIONS
(2021) Sharov, P. G.; Ismailova, A. N.; Zhukov, M. V.; Grigorenko, L. V.; Григоренко, Леонид Валентинович
© 2021 Jagellonian University. All rights reserved.The mechanism of simultaneous non-sequential four-neutron emission (or “true” four-neutron decay) has been considered in the phenomenological five-body approach. It is demonstrated that four-neutron decay fragments should have specific energy and angular correlations reflecting strong spatial correlations of “valence” nucleons orbiting in their four-neutron precursors. Due to the Pauli exclusion principle, the valence neutrons are pushed to the symmetry-allowed configurations in the four-neutron precursor structure, which causes a “Pauli focusing” effect. Prospects of the observation of the Pauli focusing have been considered for the hydrogen-7 nucleus. Fingerprints of its nuclear structure or/and decay dynamics are predicted.
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
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
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
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
Mass measurements of As, Se, and Br nuclei, and their implication on the proton-neutron interaction strength toward the N=Z line
(2021) Mardor, I.; Andres, S. A. S.; Dickel, T.; Amanbayev, D.; Grigorenko, L. V.; Григоренко, Леонид Валентинович
©2021 American Physical Society.Mass measurements of the nuclides As69,Se70,71, and Br71, produced via fragmentation of a Xe124 primary beam at the Fragment Separator (FRS) at GSI, have been performed with the multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) of the FRS Ion Catcher with an unprecedented mass resolving power of almost 1000000. Such high resolving power is the only way to achieve accurate results and resolve overlapping peaks of short-lived exotic nuclei, whose total number of accumulated events is always limited. For the nuclide As69, this is the first direct mass measurement. A mass uncertainty of 22 keV was achieved with only ten events. For the nuclide Se70, a mass uncertainty of 2.6 keV was obtained, corresponding to a relative accuracy of dm/m=4.0×10-8, with less than 500 events. The masses of the nuclides Se71 and Br71 have been measured with an uncertainty of 23 and 16 keV, respectively. Our results for the nuclides Se70,71 and Br71 are in good agreement with the 2016 Atomic Mass Evaluation, and our result for the nuclide As69 resolves the discrepancy between the previous indirect measurements. We measured also the mass of the molecule N14N15Ar40 (A=69) with a relative accuracy of dm/m=1.7×10-8, the highest yet achieved with an MR-TOF-MS. Our results show that the measured restrengthening of the proton-neutron interaction (dVpn) for odd-odd nuclei along the N=Z line above Z=29 (recently extended to Z=37) is hardly evident at the N-Z=2 line, and not evident at the N-Z=4 line. Nevertheless, detailed structure of dVpn along the N-Z=2 and N-Z=4 lines, confirmed by our mass measurements, may provide a hint regarding the ongoing ˜500 keV discrepancy in the mass value of the nuclide Br70, which prevents including it in the world average of Ft value for superallowed 0+?0+ ß decays. The reported work sets the stage for mass measurements with the FRS Ion Catcher of nuclei at and beyond the N=Z line in the same region of the nuclear chart, including the nuclide Br70.
Открытый доступ
Asymptotic normalization coefficient method for two-proton radiative capture
(2020) Parfenova, Y. L.; Shulgina, N. B.; Zhukov, M. V.; Grigorenko, L. V.; Григоренко, Леонид Валентинович
© 2020 The Author(s)The method of asymptotic normalization coefficients is a standard approach for studies of two-body non-resonant radiative capture processes in nuclear astrophysics. This method suggests a fully analytical description of the radiative capture cross section in the low-energy region of the astrophysical interest. We demonstrate how this method can be generalized to the case of three-body 2p radiative captures. It was found that an essential feature of this process is the highly correlated nature of the capture. This reflects the complexity of three-body Coulomb continuum problem. Radiative capture 15O+p+p→17Ne+γ is considered as an illustration.