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Papers by Natalia Shulgina
Nuclear Physics A, 2003
One-proton removal reactions of 936 MeV/u 8B have been studied with carbon and lead as breakup ta... more One-proton removal reactions of 936 MeV/u 8B have been studied with carbon and lead as breakup targets. Using the FRS at GSI, the longitudinal momentum distributions of the 7Be fragments and the one-proton removal cross section of 8B were measured. The relative contributions of the breakup channels leading to 7Be in its ground state and excited state at 429 keV (7Be∗) have
The 15 O(2p, γ) 17 Ne cross section has been studied by the inverse reaction, the Coulomb dissoci... more The 15 O(2p, γ) 17 Ne cross section has been studied by the inverse reaction, the Coulomb dissociation of 17 Ne. The experiment has been performed at the GSI. The 17 Ne excitation energy prior to decay has been reconstructed by using the invariant-mass method. The preliminary differential and integral Coulomb dissociation cross sections (σ Coul) have been extracted, which provide a photoabsorption (σ photo) and a radiative capture cross section (σ cap). Additionally, important information about the 17 Ne nuclear structure will be obtained. The analysis is in progress.
Physical Review C
Coulomb and nuclear dissociation of 17 Ne on light and heavy targets are studied theoretically. T... more Coulomb and nuclear dissociation of 17 Ne on light and heavy targets are studied theoretically. The dipole E1 strength function is determined in a broad energy range including energies of astrophysical interest. Dependence of the strength function on different parameters of the 17 Ne ground state structure and continuum dynamics is analyzed in a three-body model. The discovered dependence plays an important role for studies of the strength functions for the three-body E1 dissociation and radiative capture. The constraints on the [s 2 ]/[d 2 ] configuration mixing in 17 Ne and on pwave interaction in the 15 O+p channel are imposed based on experimental data for 17 Ne Coulomb dissociation on heavy target.
Physical Review C
An unusually large value of the 22 C matter radius, extracted by Tanaka et al. [Phys. Rev. Lett. ... more An unusually large value of the 22 C matter radius, extracted by Tanaka et al. [Phys. Rev. Lett. 104, 062701 (2010)] from measured reaction cross sections, attracted great attention of scientific community. Since that time, several experimental works related to the 22 C nucleus have appeared in the literature. Some of the experimental data, measured with high accuracy, allow us to fix 22 C structure more reliably. Two limiting models reproducing 22 C nuclear structure within the three-body cluster approach, that allow us to describe all existing experimental data, are presented. The 22 C ground state, continuum structure, and geometry are obtained. With fixed 22 C wave function, the prediction for the soft dipole mode in 22 C, which is studied in the process of Coulomb fragmentation, is performed.
Journal of Physics: Conference Series, 2016
The 15 O(2p,γ) 17 Ne reaction is studied using the time-reversed reaction of the 17 Ne E1 Coulomb... more The 15 O(2p,γ) 17 Ne reaction is studied using the time-reversed reaction of the 17 Ne E1 Coulomb dissociation on lead target in the context of nuclear astrophysics. Looking for the relation between the data on the Coulomb excitation and the astrophysical 2p-capture rate, one faces problem to extract the Coulomb E1 strength function from the measured Coulex cross section. We use a number of phenomenological approaches to estimate influence of such processes as Coulomb-nuclear interference, populations of states with different J π , etc. We calculate the 17 Ne+2p astrophysical capture rate and compare the results with different calculations.
The assumption that Wigner SU(4) symmetry is realized in nuclear phenomena has been used to study... more The assumption that Wigner SU(4) symmetry is realized in nuclear phenomena has been used to study the spin-isospin dependence of the Coulomb energy of a nucleus and its influence on the energies of the ground and analog states of the nucleus.
In the frame of finite-difference formalism of quasipotential scattering ; theory the phase funct... more In the frame of finite-difference formalism of quasipotential scattering ; theory the phase functions method is generalized for the case of the interaction ; of two relativistic particles. (auth);
A scheme for calculating the transfer of short-wave radiation in the atmosphere is presented with... more A scheme for calculating the transfer of short-wave radiation in the atmosphere is presented with reference to the interpretation of remote sensing images of the earth's surface. Attention is given to the solution of the boundary value problem of radiative transfer in a stratified atmosphere over an anisotropically reflecting underlying surface. The analysis is based on a spherical harmonics method.
Physics of Atomic Nuclei
Angular distribution of neutrinos (recoil nucleus) in muon capture for an allowed Gamov-Teller tr... more Angular distribution of neutrinos (recoil nucleus) in muon capture for an allowed Gamov-Teller transition is considered by taking account of hyperfine effects. This angular distribution is shown to include a correlation of the form P_2(cos A), where A is the angle between the neutrino momentum and the axis specifying the orientation of the initial mesic atom. This correlation, which arises only if the initial mesic atom is aligned, proves highly sensitive to the form factor g_P of induced pseudoscalar interaction. The proposed method for determinating g_P may be realized for the transition 1+ to 2+ from the ground state of the 6-Li nucleus to the narrow resonance of the 6-He nucleus in continuum, as well as in the processes like 10-B(3+) to 10-Be(2+), 11-B(3/2-) to 11-Be(1/2-), 23-Na(3/2+) to 23-Ne(1/2+) with transitions to bound states.
EPJ Web of Conferences, 2014
We have studied one-proton-removal reactions of about 500 MeV/u 17 Ne beams on a carbon target at... more We have studied one-proton-removal reactions of about 500 MeV/u 17 Ne beams on a carbon target at the R 3 B/LAND setup at GSI by detecting beam-like 15 Op and determining their relative-energy distribution. We exclusively selected the removal a
From analysis of current experimental data on the β decay of the neutron, complemented by positr... more From analysis of current experimental data on the β decay of the neutron, complemented by positron polarization data from nuclear β{sup +} transitions, we obtain restrictions on the parameters of right-handed currents (mixing angle, mass of the right-handed {ital W} boson) and---for the first time---on the weak axial hadronic current renormalization constant λ{sub {ital N}}. It is shown that in the presence of right-handed currents λ{sub {ital N}} may differ from the known value λ=-1.26 and vary in the range -1.51â¤Î»{sub {ital N}}â¤1.08 (at the 68% confidence level).
Theoretical and Mathematical Physics, 1973
Physics of Atomic Nuclei, 2009
ABSTRACT Hyperspherical-harmonics method to investigate the lightest nuclei having three-cluster ... more ABSTRACT Hyperspherical-harmonics method to investigate the lightest nuclei having three-cluster structure is discussed together with recent experiments. Properties of bound states and methods to explore three-body continuum are presented. The challenges created by large neutron excess and halo phenomena are highlighted. Astrophysical aspects of the 7Li + n → 8Li + γ reaction and the solar-boron-neutrinos problem are analyzed. Three-cluster structure of highly excited states in 8Be is shown to be responsible for extreme isospin mixing. Progress in studies of 6He- and 11Li-induced inclusive and exclusive nuclear reactions is demonstrated, providing information on the nature of continuum structures of Borromean nuclei.
Nuclear Physics A, 2003
One-proton removal reactions of 936 MeV/u 8B have been studied with carbon and lead as breakup ta... more One-proton removal reactions of 936 MeV/u 8B have been studied with carbon and lead as breakup targets. Using the FRS at GSI, the longitudinal momentum distributions of the 7Be fragments and the one-proton removal cross section of 8B were measured. The relative contributions of the breakup channels leading to 7Be in its ground state and excited state at 429 keV (7Be∗) have
The 15 O(2p, γ) 17 Ne cross section has been studied by the inverse reaction, the Coulomb dissoci... more The 15 O(2p, γ) 17 Ne cross section has been studied by the inverse reaction, the Coulomb dissociation of 17 Ne. The experiment has been performed at the GSI. The 17 Ne excitation energy prior to decay has been reconstructed by using the invariant-mass method. The preliminary differential and integral Coulomb dissociation cross sections (σ Coul) have been extracted, which provide a photoabsorption (σ photo) and a radiative capture cross section (σ cap). Additionally, important information about the 17 Ne nuclear structure will be obtained. The analysis is in progress.
Physical Review C
Coulomb and nuclear dissociation of 17 Ne on light and heavy targets are studied theoretically. T... more Coulomb and nuclear dissociation of 17 Ne on light and heavy targets are studied theoretically. The dipole E1 strength function is determined in a broad energy range including energies of astrophysical interest. Dependence of the strength function on different parameters of the 17 Ne ground state structure and continuum dynamics is analyzed in a three-body model. The discovered dependence plays an important role for studies of the strength functions for the three-body E1 dissociation and radiative capture. The constraints on the [s 2 ]/[d 2 ] configuration mixing in 17 Ne and on pwave interaction in the 15 O+p channel are imposed based on experimental data for 17 Ne Coulomb dissociation on heavy target.
Physical Review C
An unusually large value of the 22 C matter radius, extracted by Tanaka et al. [Phys. Rev. Lett. ... more An unusually large value of the 22 C matter radius, extracted by Tanaka et al. [Phys. Rev. Lett. 104, 062701 (2010)] from measured reaction cross sections, attracted great attention of scientific community. Since that time, several experimental works related to the 22 C nucleus have appeared in the literature. Some of the experimental data, measured with high accuracy, allow us to fix 22 C structure more reliably. Two limiting models reproducing 22 C nuclear structure within the three-body cluster approach, that allow us to describe all existing experimental data, are presented. The 22 C ground state, continuum structure, and geometry are obtained. With fixed 22 C wave function, the prediction for the soft dipole mode in 22 C, which is studied in the process of Coulomb fragmentation, is performed.
Journal of Physics: Conference Series, 2016
The 15 O(2p,γ) 17 Ne reaction is studied using the time-reversed reaction of the 17 Ne E1 Coulomb... more The 15 O(2p,γ) 17 Ne reaction is studied using the time-reversed reaction of the 17 Ne E1 Coulomb dissociation on lead target in the context of nuclear astrophysics. Looking for the relation between the data on the Coulomb excitation and the astrophysical 2p-capture rate, one faces problem to extract the Coulomb E1 strength function from the measured Coulex cross section. We use a number of phenomenological approaches to estimate influence of such processes as Coulomb-nuclear interference, populations of states with different J π , etc. We calculate the 17 Ne+2p astrophysical capture rate and compare the results with different calculations.
The assumption that Wigner SU(4) symmetry is realized in nuclear phenomena has been used to study... more The assumption that Wigner SU(4) symmetry is realized in nuclear phenomena has been used to study the spin-isospin dependence of the Coulomb energy of a nucleus and its influence on the energies of the ground and analog states of the nucleus.
In the frame of finite-difference formalism of quasipotential scattering ; theory the phase funct... more In the frame of finite-difference formalism of quasipotential scattering ; theory the phase functions method is generalized for the case of the interaction ; of two relativistic particles. (auth);
A scheme for calculating the transfer of short-wave radiation in the atmosphere is presented with... more A scheme for calculating the transfer of short-wave radiation in the atmosphere is presented with reference to the interpretation of remote sensing images of the earth's surface. Attention is given to the solution of the boundary value problem of radiative transfer in a stratified atmosphere over an anisotropically reflecting underlying surface. The analysis is based on a spherical harmonics method.
Physics of Atomic Nuclei
Angular distribution of neutrinos (recoil nucleus) in muon capture for an allowed Gamov-Teller tr... more Angular distribution of neutrinos (recoil nucleus) in muon capture for an allowed Gamov-Teller transition is considered by taking account of hyperfine effects. This angular distribution is shown to include a correlation of the form P_2(cos A), where A is the angle between the neutrino momentum and the axis specifying the orientation of the initial mesic atom. This correlation, which arises only if the initial mesic atom is aligned, proves highly sensitive to the form factor g_P of induced pseudoscalar interaction. The proposed method for determinating g_P may be realized for the transition 1+ to 2+ from the ground state of the 6-Li nucleus to the narrow resonance of the 6-He nucleus in continuum, as well as in the processes like 10-B(3+) to 10-Be(2+), 11-B(3/2-) to 11-Be(1/2-), 23-Na(3/2+) to 23-Ne(1/2+) with transitions to bound states.
EPJ Web of Conferences, 2014
We have studied one-proton-removal reactions of about 500 MeV/u 17 Ne beams on a carbon target at... more We have studied one-proton-removal reactions of about 500 MeV/u 17 Ne beams on a carbon target at the R 3 B/LAND setup at GSI by detecting beam-like 15 Op and determining their relative-energy distribution. We exclusively selected the removal a
From analysis of current experimental data on the β decay of the neutron, complemented by positr... more From analysis of current experimental data on the β decay of the neutron, complemented by positron polarization data from nuclear β{sup +} transitions, we obtain restrictions on the parameters of right-handed currents (mixing angle, mass of the right-handed {ital W} boson) and---for the first time---on the weak axial hadronic current renormalization constant λ{sub {ital N}}. It is shown that in the presence of right-handed currents λ{sub {ital N}} may differ from the known value λ=-1.26 and vary in the range -1.51â¤Î»{sub {ital N}}â¤1.08 (at the 68% confidence level).
Theoretical and Mathematical Physics, 1973
Physics of Atomic Nuclei, 2009
ABSTRACT Hyperspherical-harmonics method to investigate the lightest nuclei having three-cluster ... more ABSTRACT Hyperspherical-harmonics method to investigate the lightest nuclei having three-cluster structure is discussed together with recent experiments. Properties of bound states and methods to explore three-body continuum are presented. The challenges created by large neutron excess and halo phenomena are highlighted. Astrophysical aspects of the 7Li + n → 8Li + γ reaction and the solar-boron-neutrinos problem are analyzed. Three-cluster structure of highly excited states in 8Be is shown to be responsible for extreme isospin mixing. Progress in studies of 6He- and 11Li-induced inclusive and exclusive nuclear reactions is demonstrated, providing information on the nature of continuum structures of Borromean nuclei.