Asymmetry measurement of the polarized Σ+p elastic scattering and the hyperon-nucleon spin-orbit interaction

Kadowaki, T.; Asai, J.; Imoto, W.; Iwata, S.; Kurosawa, M.; Nakai, K.; Sato, Akira; Takahashi, Hajime; Yoon, C. J.; Maruta, T.; Ieiri, M.; Nagae, T.; Noumi, H.; Fukuda, T.; Saha, P.K.; Bassalleck, B.

doi:10.1140/epja/i2002-10054-4

Cited by 15 publications

(7 citation statements)

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“…The major objective was to determine the spin-orbit (LS) interaction between a AE þ -hyperon and a proton for comparison with that of Ã-hyperons, where the interaction was shown to be small. [3][4][5] The present series of experiments, 2,6) however, have shown that the AE þ N spin-orbit interaction is large in contrast to that in the case of ÃN, 7) consistent with theoretical predictions by Povh and Pirner, 8,9) and Yazaki. 10) Although the above conclusion has provided an important base for understanding hyperon-nucleon interactions, data analysis was premature and the conclusion was qualitative.…”

Section: Introductionsupporting

confidence: 83%

Image Analysis of SCITIC for Hyperon Scattering Experiments

Kurosawa

Asai

Fukuda

et al. 2006

jjap

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A new scintillation-track-image detector, SCITIC, has been developed and successfully used as an active target for hyperonscattering experiments. The principle and practical use in experiments of SCITIC have bean reported. In this paper, we present the results of a reanalysis of SCITIC data by a new method. The new method assures more precise three-dimensional (3D) track reconstruction than before by introducing a way of critically checking and an iterating data processing. After a brief presentation of the experimental setup and procedure of data taking, details of the image analysis are discussed. With the new analysis, the precision of the data for the AE þ p scattering experiment was improved leading to the conclusion that the AE þ p spin-orbit interaction is comparable to the NN interaction, and that the angular dependence of analyzing power is in good agreement with a theoretical prediction.

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Section: Introductionsupporting

confidence: 83%

Image Analysis of SCITIC for Hyperon Scattering Experiments

Kurosawa

Asai

Fukuda

et al. 2006

jjap

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“…Both the hyperon-nucleon potential and symmetry energy influence the hyperon dynamics in heavy-ion collisions. The hyperon potential has been extensively investigated via the hyperon-nucleus scattering [6][7][8], hypernuclear properties [9][10][11][12] and microscopic calculations [13][14][15][16]. The isospin ratios of hyperon production may be used for extracting the high-density symmetry energy, i.e., Σ − /Σ + , Ξ − /Ξ 0 .…”

Section: Introductionmentioning

confidence: 99%

High-density symmetry energy from subthreshold hyperon production in heavy-ion collisions

Zhu¹

2023

Preprint

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The hyperon dynamics in heavy-ion collisions near threshold energy has been investigated within the quantum molecular dynamics transport model. The isospin and momentum dependent hyperonnucleon potential and the threshold energy correction on the hyperon elementary cross section are included in the model. It is found that the high-density symmetry energy is dependent on the isospin ratios Σ − /Σ + and Ξ − /Ξ 0 , in particular in the domain of high kinetic energies. The isospin diffusion in heavy-ion collisions influences the neutron/proton ratio in the high-density region. The Σ − /Σ + ratio depends on the stiffness of symmetry energy, in particular at the beam energy below the threshold value (E th =1.58 GeV), i.e., the kinetic energy spectra of the single ratios, excitation functions and energy spectra of the double ratios in the isotopic reactions of 108 Sn + 112 Sn, 112 Sn + 112 Sn, 124 Sn + 124 Sn and 132 Sn + 124 Sn. The double strangeness ratio Ξ − /Ξ 0 weakly depends on the symmetry energy because of the hyperon-hyperon collision mainly contributing the Ξ production below the threshold energy (E th = 3.72 GeV).

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“…Recently, asymmetries of scattered hyperons have been measured for elastic scattering of polarized ͚ + and ⌳ on protons [7], which provide an experimental evidence on the characteristic difference of the spin dependence between ͚ + p and ⌳p interactions, though of qualitative nature at present. Considering that such kinds of experimental research will be developed more in the future, we will theoretically investigate polarization observables in YN scattering in relation to the spin dependence of YN interactions.…”

Section: Introductionmentioning

confidence: 99%

“…(31) are described in terms of the amplitudes in Eqs. ( 6), (7), and (8) for the case of general scattering between two spin-1/2 particles.…”

mentioning

confidence: 99%

Polarization phenomena in hyperon-nucleon scattering

et al. 2004

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We investigate polarization observables in hyperon-nucleon scattering by decomposing scattering amplitudes into spin-space tensors, where each component describes scattering by corresponding spin-dependent interactions, so that contributions of the interactions in the observables are individually identified. In this way, for elastic scattering we find some linear combinations of the observables sensitive to particular spin-dependent interactions such as symmetric spin-orbit ͑LS͒ interactions and antisymmetric LS ones. These will be useful to criticize theoretical predictions of the interactions when the relevant observables are measured. We treat vector analyzing powers, depolarizations, and coefficients of polarization transfers and spin correlations, a part of which is numerically examined in ͚ + p scattering as an example. Total cross sections are studied for polarized beams and targets as well as for unpolarized ones to investigate spin dependence of imaginary parts of forward scattering amplitudes.

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Asymmetry measurement of the polarized Σ+p elastic scattering and the hyperon-nucleon spin-orbit interaction

Cited by 15 publications

References 0 publications

Image Analysis of SCITIC for Hyperon Scattering Experiments

Image Analysis of SCITIC for Hyperon Scattering Experiments

High-density symmetry energy from subthreshold hyperon production in heavy-ion collisions

Polarization phenomena in hyperon-nucleon scattering

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