Polarization effects in the quasielastic (p, 2p) reaction with the nuclear S-Shell Protons at 1 GeV

Miklukho, O. V.; Kisselev, A.; Аксенов, Д. А.; Amalsky, G. M.; Andreev, V. A.; Evstiukhin, S. V.; Fedorov, O. Ya.; Gavrilov, G.; Izotov, A.; Kochenda, L.; Levchenko, M.; Maysuzenko, D. A.; Murzin, V.; Novinsky, D. V.; Prokofiev, A. N.; Shvedchikov, A. V.; Trautman, V. Yu.; Trush, S. I.; Zhdanov, A. A.

doi:10.1134/s1063778813070119

Cited by 8 publications

(4 citation statements)

References 24 publications

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“…The polarization P IV is less than that (P4 He ) in the free elastic p− 4 He scattering (empty square) [9]. This can be related to a modification of proton interaction with the four-nucleon cluster in nuclear medium [6]. The relative difference of these polarizations (P4 He -P IV )/P4 He ∼ 0.2 is close to that of the polarizations (P DW IA * and P DW IA ) calculated in the DWIA* and DWIA approximations (Fig.…”

Section: Resultsmentioning

confidence: 89%

“…2 we also observed a peak which can be identified as the 1 + excited level predicted in [5]. The polarization of the final protons was found from an azimuthal asymmetry of the proton scattering off the carbon analyzer A, using the track information from the proportional chambers (PC1÷P4 and PC1', PC4') of the polarimeter [6]. The average analyzing power of the polarimeter was calculated using the parametrization A(K, θ s ) from [7].…”

Section: Experimental Methodsmentioning

confidence: 99%

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Structure effects in polarization and cross sections for A(p, p’)X inelastic reactions on 40Ca and 12C nuclei at 1 GeV

Miklukho¹,

Kisselev²,

Amalsky³

et al. 2017

Phys. Atom. Nuclei

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The polarization of the secondary protons in the inelastic (p, p') reaction on the 40 Ca and 12 C nuclei at the initial proton energy 1 GeV was measured in a wide range of the scattered proton momenta at a laboratory angle Θ=21• . The cross sections of the reaction were measured as well. The outgoing protons from the reaction were detected using a magnetic spectrometer equipped with a multiwire-proportional chambers polarimeter. A structure in the polarization and cross section data, related probably to scattering off the nucleon correlations in the nuclei, was observed.

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Section: Resultsmentioning

confidence: 89%

Section: Experimental Methodsmentioning

confidence: 99%

Structure effects in polarization and cross sections for A(p, p’)X inelastic reactions on 40Ca and 12C nuclei at 1 GeV

Miklukho¹,

Kisselev²,

Amalsky³

et al. 2017

Phys. Atom. Nuclei

Self Cite

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show abstract

“…Evidently, other types of direct collisions using polarized protons are also influenced by the strength of the spin-orbit force and serve as a probe of its modification in the nuclear medium. For example, one has speculated modifications of nucleon and meson masses and sizes, and also of meson-nucleon coupling constants in nuclear medium, motivated by strong relativistic nuclear fields in the medium, deconfinement of quarks, and also partial chiral symmetry restoration [407,408,409,410,411]. A density dependence of the nucleon-nucleon interaction is obviously expected, modifying the expectations for nucleon induced reactions based on bare interactions.…”

Section: Polarized Protons and The Neutron Skinmentioning

confidence: 99%

Indirect methods in nuclear astrophysics with relativistic radioactive beams

Aumann,

Bertulani

2019

Preprint

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Reactions with radioactive nuclear beams at relativistic energies have opened new doors to clarify the mechanisms of stellar evolution and cataclysmic events involving stars and during the big bang epoch. Numerous nuclear reactions of astrophysical interest cannot be assessed directly in laboratory experiments. Ironically, some of the information needed to describe such reactions, at extremely low energies (e.g., keVs), can only be studied on Earth by using relativistic collisions between heavy ions at GeV energies. In this contribution, we make a short review of experiments with relativistic radioactive beams and of the theoretical methods needed to understand the physics of stars, adding to the knowledge inferred from astronomical observations. We continue by introducing a more detailed description of how the use of relativistic radioactive beams can help to solve astrophysical puzzles and several successful experimental methods. State-of-the-art theories are discussed at some length with the purpose of helping us understand the experimental results reported. The review is not complete and we have focused most of it to traditional methods aiming at the determination of the equation of state of symmetric and asymmetric nuclear matter and the role of the symmetry energy. Whenever possible, under the limitations of our present understanding of experimental data and theory, we try to pinpoint the information still missing to further understand how stars evolve, explode, and how their internal structure might be. We try to convey the idea that in order to improve microscopic theories for many-body calculations, nuclear structure, nuclear reactions, and astrophysics, and in order to constrain and allow for convergence of our understanding of stars, we still need considerable improvements in terms of accuracy of experiments and the development of new and dedicated nuclear facilities to study relativistic reactions with radioactive beams.

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“…in (p,2p) reaction studies of nuclear medium effects on the NN-interaction [10][11][12][13][14][15][16][17][18][19][20][21]. It has also been employed to investigate medium modifications of the nucleon and meson masses and the meson-nucleon coupling constants in the nuclear medium, motivated by strong relativistic nuclear fields, deconfinement of quarks, and also partial chiral symmetry restoration [22][23][24][25][26][27][28][29]. It is worthwhile noticing that there are various distinct spinorbit interactions involved in the Maris effect: (a) the spin-orbit part of the optical potential for the nucleonnucleus scattering, (b) the spin-orbit interaction responsible for the j < and j > occupancy of the knocked out nucleon orbital, and to a lesser extent, (c) the spin-orbit part of the NN-interaction.…”

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confidence: 99%

Maris polarization in neutron-rich nuclei

2018

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We present a theoretical study of the Maris polarization effect and its application in quasi-free reactions to assess information on the structure of exotic nuclei. We discuss the uncertainties in the calculations of triple differential cross sections and of analyzing powers due the choices of various nucleon-nucleon interactions the optical potentials and limitations of the method. Our calculations explore a large number of choices for the nucleon-nucleon (NN) interactions and the optical potential for nucleon-nucleus scattering. Our study implies that polarization variables in (p,2p) reactions in inverse kinematics can be an effective probe of single-particle structure of nuclei in radioactive-beam facilities.

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Polarization effects in the quasielastic (p, 2p) reaction with the nuclear S-Shell Protons at 1 GeV

Cited by 8 publications

References 24 publications

Structure effects in polarization and cross sections for A(p, p’)X inelastic reactions on 40Ca and 12C nuclei at 1 GeV

Structure effects in polarization and cross sections for A(p, p’)X inelastic reactions on 40Ca and 12C nuclei at 1 GeV

Indirect methods in nuclear astrophysics with relativistic radioactive beams

Maris polarization in neutron-rich nuclei

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