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Träfflista för sökning "WFRF:(Aksyutina Yu.) "

Sökning: WFRF:(Aksyutina Yu.)

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1.
  • Coulomb breakup of 17Ne from the viewpoint of nuclear astrophysics
  • 2012
  • Proceedings (redaktörskap) (övrigt vetenskapligt)abstract
    • By the Coulomb breakup of 17Ne, the time-reversed reaction 15O(2p,γ)17Ne has been studied. This reaction might play an important role in the rp process, as a break-out reaction of the hot CNO cycle. The secondary 17Ne ion beam with an energy of 500 MeV/nucleon has been dissociated in a Pb target. The reaction products have been detected with the LAND-R3B experimental setup at GSI. The preliminary differential and integral Coulomb dissociation cross section σCoul has been determined, which then will be converted into a photo-absorption cross section σphoto, and a two-proton radiative capture cross section σcap. Additionally, information about the structure of the 17Ne, a potential two-proton halo nucleus, will be received. The analysis is in progress.
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3.
  • Marganiec, J., et al. (författare)
  • Coulomb and nuclear excitations of narrow resonances in Ne-17
  • 2016
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 759, s. 200-205
  • Tidskriftsartikel (refereegranskat)abstract
    • New experimental data for dissociation of relativistic Ne-17 projectiles incident on targets of lead, carbon, and polyethylene targets at GSI are presented. Special attention is paid to the excitation and decay of narrow resonant states in Ne-17. Distributions of internal energy in the 150 + p + p three-body system have been determined together with angular and partial-energy correlations between the decay products in different energy regions. The analysis was done using existing experimental data on Ne-17 and its mirror nucleus N-17. The isobaric multiplet mass equation is used for assignment of observed resonances and their spins and parities. A combination of data from the heavy and light targets yielded cross sections and transition probabilities for the Coulomb excitations of the narrow resonant states. The resulting transition probabilities provide information relevant for a better understanding of the Ne-17 structure.
4.
  • Marganiec, J, et al. (författare)
  • Experimental study of the 15O(2p ,γ)17Ne cross section by Coulomb Dissociation for the rp process
  • 2016
  • Ingår i: Journal of Physics Conference Series.
  • Konferensbidrag (refereegranskat)abstract
    • The time-reversed reaction 15O(2p,γ)17Ne has been studied by the Coulomb dissociation technique. Secondary 17Ne ion beams at 500 AMeV have been produced by fragmentation reactions of 20Ne in a beryllium production target and dissociated on a secondary Pb target. The incoming beam and the reaction products have been identified with the kinematically complete LAND-R3B experimental setup at GSI. The excitation energy prior to decay has been reconstructed by using the invariant-mass method. The preliminary differential and integral Coulomb Dissociation cross sections (σCoul) have been calculated, which provide a photoabsorption (σphoto) and a radiative capture cross section (σcap). Additionally, important information about the nuclear structure of the 17Ne nucleus will be obtained. The analysis is in progress.
5.
  • Marganiec, J., et al. (författare)
  • Studies of continuum states in (16) Ne using three-body correlation techniques
  • 2015
  • Ingår i: European Physical Journal A. - 1434-6001. ; 51:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Two-proton decay of the unbound nucleus Ne-16 , produced in one-neutron knockout from a 500 MeV/u Ne-17 beam, has been studied at GSI. The ground state, at a resonance energy 1.388(15) MeV, ( MeV) above the O-14 +p+p threshold, and two narrow resonances at MeV and 7.57(6) MeV have been investigated. A comparison of the energy difference between the first excited 2(+) state and the 0(+) ground state in Ne-16 with its mirror nucleus C-16 reveals a small Thomas-Ehrman shift (TES) of keV. A trend of the TES for the T = 2 quintet is obtained by completing the known data with a prediction for F-16 obtained from an IMME analysis. The decay mechanisms of the observed three resonances were revealed from an analysis of the energy and angular correlations of the O-14 +p+p decay products. The ground state decay can be considered as a genuine three-body (democratic) mode and the excited states decay sequentially via states in the intermediate nucleus F-15 , the 3.22 MeV state predominantly via the F-15 ground-state resonance, while the 7.57 MeV state decays via the 5/2(+) resonance in F-15 at 2.8 MeV above the O-14 +p+p threshold. Further, from an analysis of angular correlations, the spin-parity of the 7.57 MeV state has been determined as and assigned as the third 2(+) state in Ne-16 based on a comparison with C-16.
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6.
  • Marganiec, J., et al. (författare)
  • STUDY OF THE O-15(2p,gamma)Ne-17 CROSS SECTION BY COULOMB DISSOCIATION OF Ne-17 FOR THE rp PROCESS OF NUCLEOSYNTHESIS
  • 2014
  • Ingår i: Acta Physica Polonica B. - 0587-4254 .- 1509-5770. ; 45:2, s. 229-234
  • Tidskriftsartikel (refereegranskat)abstract
    • The O-15(2p, gamma)Ne-17 cross section has been studied by the inverse reaction, the Coulomb dissociation of Ne-17. The experiment has been performed at the GSI. The Ne-17 excitation energy prior to decay has been reconstructed by using the invariant-mass method. The preliminary differential and integral Coulomb dissociation cross sections (sigma(Coul)) have been extracted, which provide a photoabsorption (sigma(photo)) and a radiative capture cross section (sigma(cap)). Additionally, important information about the Ne-17 nuclear structure will be obtained. The analysis is in progress.
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7.
  • Wamers, F, et al. (författare)
  • First Observation of the Unbound Nucleus 15Ne
  • 2014
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 112:13, s. 132502-1-132502-5
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on the first observation of the unbound proton-rich nucleus 15Ne. Its ground state and first excited state were populated in two-neutron knockout reactions from a beam of 500 MeV/u 17Ne. The 15Ne ground state is found to be unbound by 2.522(66) MeV. The decay proceeds directly to 13O with simultaneous two-proton emission. No evidence for sequential decay via the energetically allowed 2− and 1− states in 14F is observed. The 15Ne ground state is shown to have a strong configuration with two protons in the (sd) shell around 13O with a 63(5)% (1s1/2)2 component.
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8.
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9.
  • Johansson, H. T., et al. (författare)
  • The unbound isotopes 9,10He
  • 2010
  • Ingår i: Nuclear Physics A. - Elsevier. - 0375-9474 .- 1873-1554. ; 842:1-4, s. 15-32
  • Tidskriftsartikel (refereegranskat)abstract
    • The unbound nuclei 9He and 10He have been produced in proton-knockout reactions from a 280 MeV/u 11Li beam impinging on a liquid hydrogen target at the ALADIN-LAND setup at GSI. Information on their nuclear structure has been obtained from the relative-energy spectra, 8He + n and 8He + 2n, employing reaction models incorporating the structure of 11Li.
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10.
  • Johansson, H. T., et al. (författare)
  • Three-body correlations in the decay of He-10 and Li-13
  • 2010
  • Ingår i: Nuclear Physics A. - 0375-9474. ; 847:1-2, s. 66-88
  • Tidskriftsartikel (refereegranskat)abstract
    • The very exotic nuclear resonance systems, 10He and 13Li, are produced in proton-knockout reactions from relativistic beams of 11Li and 14Be. The experimentally determined energy and angular correlations between their decay products, <img src="http://ars.els-cdn.com/content/image/1-s2.0-S0375947410006044-si1.gif" data-inlimgeid="1-s2.0-S0375947410006044-si1.gif" data-loaded="true" /> and <img src="http://ars.els-cdn.com/content/image/1-s2.0-S0375947410006044-si2.gif" data-inlimgeid="1-s2.0-S0375947410006044-si2.gif" data-loaded="true" />, are analyzed using an expansion of decay amplitudes in a restricted set of hyperspherical harmonics. By considering only a small number of terms it is possible to extract the expansion coefficients directly from the experimental three-body correlations. This provides a model-independent way of getting information about the decay process, on the structure of the decaying nucleus and on the quantum characteristics of the binary subsystems.The results show that the <img src="http://ars.els-cdn.com/content/image/1-s2.0-S0375947410006044-si3.gif" data-inlimgeid="1-s2.0-S0375947410006044-si3.gif" data-loaded="true" /> relative-energy spectrum can be interpreted as consisting of two resonances, an Iπ=0+ ground state and an excited Iπ=2+ state. The <img src="http://ars.els-cdn.com/content/image/1-s2.0-S0375947410006044-si6.gif" data-inlimgeid="1-s2.0-S0375947410006044-si6.gif" data-loaded="true" /> relative-energy spectrum is interpreted as an Iπ=3/2− ground state overlapping with excited states having a structure similar to the 2+ state in 10He but spread over several states due to the coupling to the Iπ=3/2− core. The13Li data also give evidence for a contribution of a configuration where the two neutrons occupy the d-shell.
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