8 results on '"R. S. Slepnev"'
Search Results
2. Resonant states in H7 : Experimental studies of the H2(He8,He3) reaction
- Author
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A. M. Quynh, N. B. Shulgina, B. Mauyey, V. N. Schetinin, S. G. Belogurov, B. Zalewski, S. I. Sidorchuk, G. Kaminski, D. A. Kostyleva, I. G. Mukha, W. Piatek, G. M. Ter-Akopian, I. A. Muzalevskii, E. Yu. Nikolskii, A. A. Bezbakh, S. A. Krupko, Yu. L. Parfenova, S. V. Stepantsov, A. V. Gorshkov, R. Wolski, A. Swiercz, P. G. Sharov, A. S. Fomichev, V. Chudoba, O. Kiselev, P. Szymkiewicz, L. V. Grigorenko, E. M. Gazeeva, D. Biare, A. Serikov, M. Yu. Kozlov, Mikhail V. Zhukov, and R. S. Slepnev
- Subjects
Physics ,Atomic physics - Published
- 2021
3. Spectroscopy of excited states of unbound nuclei Ar30 and Cl29
- Author
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Ismael Martel, Imrich Szarka, T. A. Golubkova, Z. Janas, A. M. Sánchez-Benítez, W. Dominik, M. Takechi, Yu. A. Litvinov, Yoshiki Tanaka, R. Knöbel, V. B. Dunin, S. Pietri, C. Nociforo, M. Pfützner, A. Estrade, R. S. Slepnev, L. V. Grigorenko, Luis Acosta, I. Mukha, A. A. Ciemny, F. Farinon, O. Kiselev, C. Scheidenberger, G. Marquínez-Durán, X. Xu, J. Duénas-Díaz, Branislav Sitar, M. Pomorski, M. Winkler, G. Kaminski, M. Kuich, A. K. Ordúz, S. Rymzhanova, M. Stanoiu, P. G. Sharov, A. Prochazka, J. S. Winfield, Helmut Weick, J. M. Espino, H. Simon, Hans Geissel, S. A. Krupko, C. Mazzocchi, A. V. Gorshkov, A. S. Fomichev, Peter Strmen, Enrique Casarejos, and V. Chudoba
- Subjects
Joint research ,Physics ,010308 nuclear & particles physics ,0103 physical sciences ,Library science ,Christian ministry ,010306 general physics ,01 natural sciences - Abstract
This work was supported in part by the Helmholtz International Center for FAIR (HIC for FAIR), the Helmholtz Association (grant IK-RU-002), the Russian Ministry of Education and Science (grant No. NSh- 932.2014.2), the Russian Science Foundation (grant No. 17-12-01367), the Polish National Science Center (Contract No. UMO-2011/01/B/ST2/01943), the Polish Ministry of Science and Higher Education (Grant No. 0079/DIA/2014/43,Grant Diamentowy), the Helmholtz- CAS Joint Research Group (grant HCJRG-108), the FPA2009-08848 contract (MICINN, Spain), the Justus- Liebig-Universit¨at Giesen (JLU) and GSI under the JLUGSI strategic Helmholtz partnership agreement. This article is a part of PhD thesis of X.-D. Xu. The authors acknowledge the help of D. Kostyleva in the preparation of the manuscript.
- Published
- 2018
4. Search for 2p decay of the first excited state of Ne17
- Author
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Leonid V. Grigorenko, P. G. Sharov, S. I. Sidorchuk, M. S. Golovkov, R. Wolski, G. Kaminski, Gurgen Mkrtychevich Ter-Akopian, S. V. Stepantsov, Irina A. Egorova, A. A. Bezbakh, Yu. L. Parfenova, Vratislav Chudoba, M. Mentel, A. S. Fomichev, R. S. Slepnev, E. Yu. Nikolskii, A. V. Gorshkov, S. A. Rymzhanova, T. A. Golubkova, S. A. Krupko, A. G. Knyazev, and P. Pluchinski
- Subjects
Physics ,010308 nuclear & particles physics ,Astrophysics::High Energy Astrophysical Phenomena ,Excited state ,0103 physical sciences ,Atomic physics ,010306 general physics ,Width ratio ,01 natural sciences - Abstract
Two-proton decay of the $^{17}\mathrm{Ne}$ low-lying states populated in the $^{1}\mathrm{H}(^{18}\mathrm{Ne},d)^{17}\mathrm{Ne}$ transfer reaction is studied. The two-proton width ${\mathrm{\ensuremath{\Gamma}}}_{2p}$ of the $^{17}\mathrm{Ne}$ first excited $3/{2}^{\ensuremath{-}}$ state at ${E}^{*}=1.288$ MeV is of importance for the two-proton radioactivity theory and nuclear-astrophysics applications. A dedicated search for the two-proton emission of this state was performed leading to the new upper limit obtained for the width ratio ${\mathrm{\ensuremath{\Gamma}}}_{2p}/{\mathrm{\ensuremath{\Gamma}}}_{\ensuremath{\gamma}}l1.6(3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. An original, ``combined mass'' method is suggested and tested as capable of improving the resolution of the experiment, which is a prime significance for the study of nuclear states with extremely small particle-to-gamma width ratios ${\mathrm{\ensuremath{\Gamma}}}_{\mathrm{part}}/{\mathrm{\ensuremath{\Gamma}}}_{\ensuremath{\gamma}}$. The condition ${\mathrm{\ensuremath{\Gamma}}}_{\mathrm{part}}\ensuremath{\ll}{\mathrm{\ensuremath{\Gamma}}}_{\ensuremath{\gamma}}$ is quite common for the states of astrophysical interest, which makes the proposed approach promising in this field.
- Published
- 2017
5. β-delayed three-proton decay ofAr31
- Author
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Yasumoto Tanaka, R. S. Slepnev, R. Knöbel, F. Farinon, Herbert A. Simon, S. A. Krupko, C. Mazzocchi, S. Pietri, O. Kiselev, S. Baraeva, M. Takechi, Ismael Martel, Imrich Szarka, J. Duénas-Díaz, M. Kuich, J. S. Winfield, G. Kaminski, A. K. Ordúz, I. G. Mukha, V. B. Dunin, M. Stanoiu, A. Prochazka, M. Pfützner, Branislav Sitar, M. Pomorski, Peter Strmen, L. Acosta, A. V. Gorshkov, E. Casarejos, A. S. Fomichev, J. M. Espino, Hans Geissel, C. Nociforo, Yu. A. Litvinov, Alfredo Estrade, Helmut Weick, G. Marquínez-Durán, A. A. Lis, A. M. Sánchez-Benítez, W. Dominik, and Z. Janas
- Subjects
Physics ,Nuclear and High Energy Physics ,Decay scheme ,Time projection chamber ,Proton decay ,Branching fraction ,Double beta decay ,Astrophysics::Solar and Stellar Astrophysics ,Atomic physics ,Nuclear Experiment ,Nucleon ,Beta decay ,Ion - Abstract
The $\ensuremath{\beta}$ decay of $^{31}\mathrm{Ar}$, produced by fragmentation of an $^{36}\mathrm{Ar}$ beam at 880 MeV/nucleon, was investigated. Identified ions of $^{31}\mathrm{Ar}$ were stopped in a gaseous time projection chamber with optical readout allowing us to record decay events with emission of protons. In addition to $\ensuremath{\beta}$-delayed emission of one and two protons we clearly observed the $\ensuremath{\beta}$-delayed three-proton branch. The branching ratio for this channel in $^{31}\mathrm{Ar}$ is found to be $0.07\ifmmode\pm\else\textpm\fi{}0.02$%.
- Published
- 2015
6. New insight into the low-energyHe9spectrum
- Author
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M. S. Golovkov, S. I. Sidorchuk, R. S. Slepnev, W. Mittig, R. Wolski, A. A. Korsheninnikov, Yu. Ts. Oganessian, A. S. Fomichev, A. M. Rodin, A. V. Gorshkov, L. V. Grigorenko, S. V. Stepantsov, V. A. Gorshkov, B. G. Novatskii, S. A. Krupko, P. Roussel-Chomaz, V. A. Kuzmin, D. N. Stepanov, E. Yu. Nikolskii, and G. M. Ter-Akopian
- Subjects
Physics ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,Spectrum (functional analysis) ,Scattering length ,State (functional analysis) ,01 natural sciences ,Resonance (particle physics) ,Angular correlation ,0103 physical sciences ,Atomic physics ,Nuclear Experiment ,010306 general physics ,Nucleon ,Energy (signal processing) ,Radioactive decay - Abstract
The spectrum of $^{9}\mathrm{He}$ was studied by means of the $^{2}\mathrm{H}$($^{8}\mathrm{He}$,$p$)$^{9}\mathrm{He}$ reaction at a laboratory energy of 25 MeV/nucleon and small center-of-mass angles. Energy and angular correlations were obtained for the $^{9}\mathrm{He}$ decay products by complete kinematical reconstruction. The lowest resonant state of $^{9}\mathrm{He}$ is found at 2.0 \ifmmode\pm\else\textpm\fi{} 0.2 MeV with a width of $~2$ MeV and is identified as $1/{2}^{\ensuremath{-}}$. The observed angular correlation pattern is uniquely explained by the interference of the $1/{2}^{\ensuremath{-}}$ resonance with a virtual $1/{2}^{+}$ state (a limit $ag\ensuremath{-}20$ fm is obtained for the scattering length), and with a $5/{2}^{+}$ resonance at energy $\ensuremath{\geqslant}4.2$ MeV.
- Published
- 2007
7. Correlation studies of theH5spectrum
- Author
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A. A. Yukhimchuk, S. K. Grishechkin, V. Bouchat, S. V. Zlatoustovskiy, R. Raabe, A. M. Rodin, L. V. Grigorenko, A. S. Fomichev, O. Dorvaux, A. A. Bogatchev, S. A. Krupko, L. Nalpas, Yu. I. Vinogradov, E. Yu. Nikolskii, R. S. Slepnev, R. Wolski, W. Mittig, Th. Materna, F. Hanappe, S. V. Stepantsov, R. Palit, M. S. Golovkov, M. G. Itkis, P. Roussel-Chomaz, N. A. Kondratiev, A.A. Korsheninnikov, G.M. Ter-Akopian, V. V. Perevozchikov, L. Stuttge, Yu. Ts. Oganessian, E. M. Kozulin, A. S. Denikin, V. Lapoux, C. Angulo, S. I. Sidorchuk, and V. Kinnard
- Subjects
Nuclear reaction ,Physics ,Nuclear and High Energy Physics ,education.field_of_study ,010308 nuclear & particles physics ,Population ,Hadron ,01 natural sciences ,7. Clean energy ,Spectral line ,Excited state ,0103 physical sciences ,Mass spectrum ,Atomic physics ,010306 general physics ,Ground state ,education ,Nucleon - Abstract
The nuclear system {sup 5}H was studied using the {sup 3}H(t,p){sup 5}H transfer reaction at a laboratory energy of 57.7 MeV and small center of mass angles. The energy and angular correlations among the {sup 5}H decay fragments were obtained by complete kinematical reconstruction. A broad structure in the {sup 5}H missing mass spectrum above 2.5 MeV with a typical width of several MeV was identified as a mixture of 3/2{sup +} and 5/2{sup +} states. Analysis of interference patterns observed in the measured angular correlations disclosed the 1/2{sup +} ground state of {sup 5}H concealed in the smooth missing mass spectrum. The deduced values for the resonance energy and width are E{sub g.s.}{approx_equal}1.8 MeV and {gamma}{sub g.s.}{approx_equal}1.3 MeV. The estimated cross sections for population of the ground state and the doublet of excited states at {theta}{sub c.m.}=5 deg. are 150{+-}50 {mu}b/sr and 4.6{+-}2 mb/sr, respectively.
- Published
- 2005
8. T=5/2states in9Li:Isobaric analog states of9He
- Author
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Dmitry Aleksandrov, J. J. Kolata, G. G. Chubarian, Grigory Rogachev, M. S. Golovkov, Yu. Ts. Oganessian, V. Z. Goldberg, A. M. Rodin, Wladyslaw Henryk Trzaska, B. B. Skorodumov, G. M. Ter-Akopian, R. S. Slepnev, A. S. Fomichev, and R. Wolski
- Subjects
Excitation function ,Physics ,Elastic scattering ,Nuclear and High Energy Physics ,Nuclear Theory ,Inverse ,Isobaric process ,Atomic physics ,Nuclear Experiment ,Energy (signal processing) - Abstract
The thick target inverse kinematic method was applied to the study of isobaric analog states in the neutron-rich nucleus ${}^{9}\mathrm{Li}.$ For this purpose, an excitation function for ${}^{8}\mathrm{He}+p$ elastic scattering was measured in the center-of-momentum energy range from 1.6 to 5.8 MeV. Three $T=5/2$ states in ${}^{9}\mathrm{Li}$ (isobaric analogs of ${}^{9}\mathrm{He})$ were observed. Restrictions on the spin-parity assignments are provided according to R-matrix calculations, and conclusions regarding the structure of ${}^{9}\mathrm{He}$ are given.
- Published
- 2003
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