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O. V. Strekalovsky

Bio: O. V. Strekalovsky is an academic researcher from Joint Institute for Nuclear Research. The author has contributed to research in topics: Fission & Scattering. The author has an hindex of 3, co-authored 28 publications receiving 80 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the results of two different experiments for the study of fission of 252Cf (sf) events in coincidence with neutrons are reported, where two time-of-flight-energy (TOF-E detectors systems have been used.
Abstract: Results of two different experiments for the study of fission of 252Cf (sf) events in coincidence with neutrons are reported. Two time-of-flight-energy (TOF-E detectors systems have been used. The fission fragment masses were obtained in a double arm coincidence set-up, where the missing mass in the binary decay is used to characterise ternary fission as a collinear cluster tri-partition (CCT). The 3He filled neutron counters have been arranged so as to detect principally neutrons emitted from an isotropic source in the laboratory frame. The fission events connected to the larger experimental neutron multiplicities show a wide range in the missing-mass spectrum, down to $ \alpha$ -particles, carbon and oxygen isotopes. These are linked with magic nuclei in the binary mass-mass correlations of the fission fragments. These neutron gated data are virtually free from background events from scattered binary fission fragments. The ungated spectra are compared to those of the previous data from our previous article (Eur. Phys. J. A. 45, 29 (2010)), the observed structures agree well with the manifestations of the collinear cluster tri-partition of 252Cf (sf) observed earlier. Several new families of the CCT modes are observed.

49 citations

Journal ArticleDOI
TL;DR: In this paper, the ternary yields of heavy hot composite systems with excitation energies of 1.5-2.5 MeV / amu have been studied in the reactions of 14N(53 A ǫ) with 197Au and 232Th.

11 citations

Journal ArticleDOI
TL;DR: Pyatkov et al. as discussed by the authors examined the evidence for collinear cluster tripartition and found that the tripartite tri-partition is more robust than the traditional tripartit.
Abstract: CITATION: Pyatkov, Yu. V., et al., 2017. Examination of evidence for collinear cluster tri-partition. Physical Review C, 96(6):1-16, doi:10.1103/PhysRevC.96.064606.

11 citations

Journal ArticleDOI
TL;DR: In this paper, the pulse-height versus deposited energy response of a single-crystal chemical vapor deposition (scCVD) diamond detector was measured for ions of Ti, Cu, Nb, Ag, Xe, Au, and of fission fragments of 252 Cf at different energies.
Abstract: The pulse-height versus deposited energy response of a single-crystal chemical vapor deposition (scCVD) diamond detector was measured for ions of Ti, Cu, Nb, Ag, Xe, Au, and of fission fragments of 252 Cf at different energies. For the fission fragments, data were also measured at different electric field strengths of the detector. Heavy ions have a significant pulse-height defect in CVD diamond material, which increases with increasing energy of the ions. It also depends on the electrical field strength applied at the detector. The measured pulse-height defects were explained in the framework of recombination models. Calibration methods known from silicon detectors were modified and applied. A comparison with data for the pulse-height defect in silicon detectors was performed.

5 citations


Cited by
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Journal ArticleDOI
TL;DR: This work first of all reviews the recent developments in experimental fission techniques, in particular the resurgence of transfer-induced fission reactions with light and heavy ions, the emerging use of inverse-kinematic approaches, both at Coulomb and relativistic energies, and of fission studies with radioactive beams.
Abstract: In the last two decades, through technological, experimental and theoretical advances, the situation in experimental fission studies has changed dramatically. With the use of advanced production and detection techniques both much more detailed and precise information can now be obtained for the traditional regions of fission research and, crucially, new regions of nuclei have become routinely accessible for fission studies. This work first of all reviews the recent developments in experimental fission techniques, in particular the resurgence of transfer-induced fission reactions with light and heavy ions, the emerging use of inverse-kinematic approaches, both at Coulomb and relativistic energies, and of fission studies with radioactive beams. The emphasis on the fission-fragment mass and charge distributions will be made in this work, though some of the other fission observables, such as prompt neutron and γ-ray emission will also be reviewed. A particular attention will be given to the low-energy fission in the so far scarcely explored nuclei in the very neutron-deficient lead region. They recently became the focus for several complementary experimental studies, such as β-delayed fission with radioactive beams at ISOLDE(CERN), Coulex-induced fission of relativistic secondary beams at FRS(GSI), and several prompt fusion-fission studies. The synergy of these approaches allows a unique insight in the new region of asymmetric fission around 180Hg, recently discovered at ISOLDE. Recent extensive theoretical efforts in this region will also be outlined. The unprecedented high-quality data for fission fragments, completely identified in Z and A, by means of reactions in inverse kinematics at FRS(GSI) and VAMOS(GANIL) will be also reviewed. These experiments explored an extended range of mercury-to-californium elements, spanning from the neutron-deficient to neutron-rich nuclides, and covering both asymmetric, symmetric and transitional fission regions. Some aspects of heavy-ion induced fusion-fission and quasifission reactions will be also discussed, which reveal their dynamical features, such as the fission time scale. The crucial role of the multi-chance fission, probed by means of multinucleon-transfer induced fission reactions, will be highlighted. The review will conclude with the discussion of the new experimental fission facilities which are presently being brought into operation, along with promising 'next-generation' fission approaches, which might become available within the next decade.

141 citations

Journal ArticleDOI
TL;DR: In this article, the authors present calculations of beta-delayed and neutron-induced fission rates, taking into account different fission barriers predictions and mass formulae, and show that triple fission is possible for A > 260 and has an effect on the formation of the abundances of heavy nuclei.

106 citations

Book ChapterDOI
01 Jan 2014
TL;DR: The Collinear Clustered Clustering Tripartition (CCT) as discussed by the authors is a new kind of ternary decay of low excited heavy nuclei called "collinear cluster tripartition" due to the features of the effect observed.
Abstract: This lecture notes are devoted to the new kind of ternary decay of low excited heavy nuclei called by us “collinear cluster tri-partition” (CCT) due to the features of the effect observed, namely, decay partners fly away almost collinearly and at least one of them has magic nucleon composition. At the early stage of our work the process of “true ternary fission” (fission of the nucleus into three fragments of comparable masses) was considered to be undiscovered for low excited heavy nuclei. Another possible prototype—three body cluster radioactivity—was also unknown. The most close to the CCT phenomenon, at least cinematically, stands so called “polar emission”, but only very light ions (up to isotopes of Be) were observed so far.

23 citations

Journal ArticleDOI
TL;DR: In this paper, the authors discuss true ternary fission (TFFF) into three nuclei of almost equal size (e.g. Z = 98 → Z i = 32, 34, 32) in the same systems.

23 citations

Journal ArticleDOI
TL;DR: In this paper, the existence of a new type of cluster decay called "collinear cluster tripartition" (CCT) is discussed by an analysis of the landscape of the potential energy surface (PES).
Abstract: The existence of a new type of cluster decay called 'collinear cluster tri-partition' (CCT) is discussed by an analysis of the landscape of the potential energy surface (PES). The total energy of the ternary system is found as a sum of the binding energies of fragments and nucleus–nucleus interaction between them. The pre-scission state of the ternary system is assumed to be arranged as a chain of the three fragments along a straight line. Minima and valleys of the PES are determined by variation of the proton and neutron distributions between them. Pre-scission prompt emission of neutrons is assumed and PES is calculated for the cases of emission of two neutrons. The presence of the valley corresponding to the formation of the isotopes of Sn with masses A = 130–136 is inherent for all PES calculated for CCT for spontaneous fission of and fission induced by neutrons of . There are local minima indicating the formation of Ca, Fe, Ni, Ge and Se isotopes having magic proton or/and neutron numbers, such as 20, 28 and 50. The analysis shows that the experimentally observed is formed as the edge fragment of the ternary system connecting to Sn by Si and Ca isotopes at fission of and , respectively.

20 citations