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Your search keyword '"G.M. Ter-Akopian"' showing total 6 results
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6 results on '"G.M. Ter-Akopian"'

1. The 8He and 10He spectra studied in the (t,p) reaction

Author

Dan-Yang Pang, Alain Ninane, E. Yu. Nikolskii, W. Mittig, S. A. Krupko, B. G. Novatskii, S. K. Grishechkin, V. A. Gorshkov, R. S. Slepnev, A. A. Yukhimchuk, Yu. I. Vinogradov, A.A. Korsheninnikov, D. N. Stepanov, L. Stuttge, S. V. Zlatoustovskiy, V. V. Perevozchikov, E. A. Kuzmin, A. M. Rodin, G.M. Ter-Akopian, A. S. Fomichev, Yu. Ts. Oganessian, S. V. Stepantsov, F. Hanappe, S. I. Sidorchuk, M. S. Golovkov, V. Chudoba, R. Wolski, P. Roussel-Chomaz, and L. V. Grigorenko

Subjects
Physics, Nuclear and High Energy Physics, education.field_of_study, 010308 nuclear & particles physics, Population, 01 natural sciences, Spectral line, Dipole, Excited state, 0103 physical sciences, Peak value, Atomic physics, Basso continuo, 010306 general physics, Ground state, education, Excitation
Abstract

The low-lying spectra of 8He and 10He nuclei were studied in the 3H(6He, p)8He and 3H(8He, p)10He transfer reactions. The 0+ ground state (g.s.) of 8He and excited states, 2+ at 3.6–3.9 MeV and (1+) at 5.3–5.5 MeV, were populated with cross sections of 200, 100–250, and 90–125 μb/sr, respectively. Some evidence for a 8He state at about 7.5 MeV was obtained. We discuss a possible nature of the nearthreshold anomaly above 2.14 MeV in 8He and relate it to the population of a 1− continuum (soft dipole excitation) with a peak value at about 3 MeV. The lowest energy group of events in the 10He spectrum was observed at ∼ 3 MeV with a cross section of ∼ 140 μb/sr. We argue that this result is consistent with the previously reported observation of 10He providing the new 10He g.s. position at about 3 MeV

Published
2009

2. Properties of very n-rich He isotopes

Author

S. K. Grishechkin, Yu. Ts. Oganessian, E. A. Kuzmin, L. Stuttge, A. M. Rodin, E. Yu. Nikolskii, A. S. Fomichev, V. A. Gorshkov, R. S. Slepnev, B. G. Novatskii, Yu. I. Vinogradov, Dan-Yang Pang, S. V. Zlatoustovskiy, A. A. Yukhimchuk, R. Wolski, Alain Ninane, P. Roussel-Chomaz, F. Hanappe, L. V. Grigorenko, M. S. Golovkov, W. Mittig, S. A. Krupko, D. N. Stepanov, G.M. Ter-Akopian, S. V. Stepantsov, V. V. Perevozchikov, S. I. Sidorchuk, V. Chudoba, A.A. Korsheninnikov, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear and High Energy Physics, education.field_of_study, 010308 nuclear & particles physics, Properties of specific nuclei listed by mass ranges: A ≤ 5, Hadron, Population, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Spectral line, Dipole, Reactions induced by unstable nuclei, Transfer reactions, Excited state, 0103 physical sciences, Nuclear fusion, Atomic physics, 010306 general physics, Ground state, education, 25.60.-t, 25.60.Je, 27.10.+h, Excitation
Abstract

Low-energy spectra of the He-8,He-10 nuclei were investigated in the (t, p)-type reactions at small centre-of-mass angles using similar to 25AMeV beams of He-6 and He-8 nuclei. The 0(+) ground state (g.s.) of He-8 and excited states, 2(+) at 3.6-3.9MeV and (1(+)) at 5.3-5.5 MeV, were populated with cross-sections of 200, 100-250, and 90-125 mu b/sr, respectively. To account for a near-threshold anomaly observed in the He-8 spectrum the population of a 1(-) continuum (soft dipole excitation) was considered. The lowest-energy group of events in the He-10 spectrum was observed at similar to 3MeV with a cross-section of similar to 140 mu b/sr. This result is consistent with the previously reported observation of He-10 providing a new g.s. position for He-10 at about 3MeV.

Published
2008

3. Quest for the $^{10}$He nucleus

Author

A. M. Rodin, A. S. Fomichev, V. A. Kuzmin, S. V. Stepantsov, A. V. Gorshkov, A.A. Korsheninnikov, E. Yu. Nikolskii, S. A. Krupko, Yu. Ts. Oganessian, F. Hanappe, D. N. Stepanov, B. G. Novatskii, O. Dorvaux, V. Bouchat, M. S. Golovkov, L. Stuttge, V. A. Gorshkov, V. Kinnard, S. I. Sidorchuk, R. S. Slepnev, V. Chudoba, G.M. Ter-Akopian, W. Mittig, P. Roussel-Chomaz, R. Wolski, Th. Materna, L. V. Grigorenko, Joint Institute for Nuclear Research (JINR), RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Joint Institute for Nuclear Research - Dubna, RIKEN Nishina Center (for Accelerator-Based Science), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Resolution (mass spectrometry), 010308 nuclear & particles physics, General Physics and Astronomy, Resonance, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Coincidence, Nuclear physics, medicine.anatomical_structure, 0103 physical sciences, Mass spectrum, medicine, General Materials Science, Center of mass, Physical and Theoretical Chemistry, Atomic physics, 010306 general physics, Nuclear Experiment, Nucleus
Abstract

The spectrum of $\rm ^He$ was studied by means of the $\rm ^He, p)^He$ reaction at a laboratory energy of 25 $\rm MeV/A$ and small center-of-mass angles. Missing mass spectrum of $\rm ^He$ was derived from the obtained p-8He coincidence. A resolution of 0.7 MeV was achieved in this spectrum for the measured $\rm ^He$ energy. Most likely, a well isolated group of 10 events detected between 2 and 5 MeV and showing a maximum at about 3 MeV in the spectrum of the present work exhibits the $\rm ^He$ g.s. resonance.

Published
2008

4. Correlation studies of theH5spectrum

Author

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

5. New insights into the resonance states of $^{5}$H and $^{5}$He

Author

A. A. Yukhimchuk, F. Hanappe, S. V. Stepantsov, Yu. I. Vinogradov, S. V. Zlatoustovskiy, M. S. Golovkov, E. Yu. Nikolskii, V. Bouchat, R. Palit, V. V. Perevozchikov, S. K. Grishechkin, R. Raabe, Yu. Ts. Oganessian, A. M. Rodin, L. Nalpas, A. S. Fomichev, A.A. Korsheninnikov, G.M. Ter-Akopian, O. Dorvaux, S. A. Krupko, L. V. Grigorenko, P. Roussel-Chomaz, R. Wolski, Th. Materna, V. Lapoux, C. Angulo, V. Kinnard, L. Stuttge, W. Mittig, R. S. Slepnev, S. I. Sidorchuk, RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), C. Gross, W. Nazarewicz, K. Rykaczewski, Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and RIKEN Nishina Center (for Accelerator-Based Science)

Subjects
Physics, Nuclear and High Energy Physics, Ion beam, 010308 nuclear & particles physics, Hadron, Nuclear reactions involving few-nucleon systems, 25.10.+s, 25.60.-t, 25.60.Je, 27.10.+h, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Deuterium, Reactions induced by unstable nuclei, Transfer reactions, Properties of specific nuclei listed by mass ranges: A≤5, 0103 physical sciences, Nuclear fusion, Tritium, Atomic physics, 010306 general physics, Ground state, Excitation, Beam (structure)
Abstract

International audience; The $^{5}$H system was produced in the $^{3}$H(t, p) $^{5}$H reaction studied at small CM angles with a 58MeV tritium ion beam. High statistics data were used to reconstruct the energy and angular correlations between the $^{5}$H decay fragments. A broad structure in the $^{5}$H missing-mass spectrum showing up above 2.5MeV was identified as a mixture of the $3/2^+$ and $5/2^+$ states. The data also present an evidence that the $1/2^+$ ground state of $^{5}$H is located at about 2MeV. Then, the $^{5}$H and $^{5}$He systems were explored by means of transfer reactions occurring in the interactions of 132MeV $^{6}$He beam nuclei with deuterium. In the $^{2}$H( $^{6}$He, $^{3}$H) reaction a T = 3/2 isobaric analog state of $^{5}$H in $^{5}$He was observed at an excitation energy of 22.0±0.3MeV with a width of 2.5±0.3MeV.

Published
2004

6. Experimental study of $^{4}$H in the reactions $^{2}$H(t,p) and $^{3}$H(t,d)

Author

M. S. Golovkov, S. I. Sidorchuk, Yu. Ts. Oganessian, Yu. I. Vinogradov, Alain Ninane, E. Yu. Nikolskii, R. Wolski, L. Stuttge, A. A. Yukhimchuk, Th. Materna, W. Mittig, A.A. Korsheninnikov, F. Hanappe, P. Roussel-Chomaz, S. V. Stepantsov, V. V. Perevozchikov, R. S. Slepnev, G.M. Ter-Akopian, D. D. Bogdanov, A. M. Rodin, A. S. Fomichev, RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and RIKEN Nishina Center (for Accelerator-Based Science)

Subjects
Physics, inorganic chemicals, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Scattering, technology, industry, and agriculture, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Resonance (particle physics), 27.10.+h, 25.60.Je, Nuclear physics, Recoil, Deuterium, 0103 physical sciences, cardiovascular system, polycyclic compounds, Tritium, Neutron, lipids (amino acids, peptides, and proteins), 010306 general physics, Beam (structure), S-matrix
Abstract

The H-4 resonance was investigated in the transfer reactions H-2(t,p)H-4 and H-3(t,d)H-4 using cryogenic liquid targets of deuterium and tritium and 58 MeV triton beam. The multidetector system with a large angular acceptance was used to measure the recoil protons and deuterons in coincidences with tritons or neutrons from the decay of H-4. Data analysis involved careful considerations made for the competing processes of final state interaction and quasifree scattering. The experimental data show a peak with resonance parameters E-res = 3.05 +/- 0.19 MeV and Gamma(obs) = 4.18 +/- 1.02 MeV. The pole of S-matrix corresponding to the physical values of energy and width, E-0 = 1.99 +/- 0.37 MeV and Gamma(0) = 2.85 +/- 10.3 MeV, has been extracted. (C) 2004 Elsevier B.V. All rights reserved.

Published
2004

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