High-energy pion-nucleus elastic scattering

Chen, C. M.; Ernst, D. J.; Johnson, Mikkel B.

doi:10.1103/physrevc.48.841

Cited by 29 publications

(23 citation statements)

References 45 publications

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“…in terms of the interaction between the pion and medium particles, including the effects of the ∆(1323), ∆ 13 (1520), and F 15 (1680) resonances [51,52].…”

Section: Effects Of Multiple Scattering and Optical Potentialmentioning

confidence: 99%

“…In principle, the optical potential can be determined from two-body data and the distribution of particles in the medium, as carried out for example in Ref. [47,51,52]. Under the interaction of an optical potential V (k, x), the amplitude for a produced particle to propagate from x to x ′′ is given by [44] exp{iφ s (x → x ′′ )} = exp{−i…”

Section: Effects Of Multiple Scattering and Optical Potentialmentioning

confidence: 99%

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Intensity interferometry for a chaotic source with a collective flow and multiple scattering

Wong¹

2003

J. Phys. G: Nucl. Part. Phys.

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We study the effects of a collective flow and multiple scattering on two-particle correlation measurements in Hanbury-Brown-Twiss intensity interferometry. We find that under a collective flow the effective source distribution in a two-particle correlation measurement depends on the initial source distribution. In addition, it depends on a collective flow phase function which consists of terms that tend to cancel each other. As the detected particles traverse from the source point to the freeze-out point, they are subject to multiple scattering with medium particles. We examine the effects of multiple scattering on HBT correlations. By using the Glauber theory of multiple scattering at high energies and the optical model at intermediate energies, we find that multiple scattering leads to an absorption and an effective density distribution that depends on the initial source distribution.PACS numbers: 25.75-q 25.75.Gz 25.75.Ld *

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“…in terms of the interaction between the pion and medium particles, including the effects of the ∆(1323), ∆ 13 (1520), and F 15 (1680) resonances [51,52].…”

Section: Effects Of Multiple Scattering and Optical Potentialmentioning

confidence: 99%

Section: Effects Of Multiple Scattering and Optical Potentialmentioning

confidence: 99%

Intensity interferometry for a chaotic source with a collective flow and multiple scattering

Wong¹

2003

J. Phys. G: Nucl. Part. Phys.

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“…[20]. A comparison of the present optical model reaction cross sections to those computed by a model designed for higher pion beam energies and successful at fitting ~-elastic data at 400 MeV and 500 MeV on Ca [21] found the simpler results no more than 17% low for Ca. If this trend continues to heavier nuclei, our stated fission probabilities would increase somewhat.…”

Section: Theoretical Methodsmentioning

confidence: 90%

Mass and energy dependence of pion-induced fission

Peterson

deBarros

deSouza

et al. 1995

Z. Physik A - Hadrons and Nuclei

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Abstract. Data for fission induced by pi meson beams from 80 to 500 MeV are presented for nuclei from Fe through Pu as measured by solid state track detectors. The general trends for binary fission with ~+ are reproduced fairly well by a calculation in the 'high excitation' limit with standard level density and fission barrier parameters, but 7c-data are underpredicted. A universal dependence of the binary fission probabilities with the fissility (Z + 1)2/A is found to be valid for both pion beam charges for all beam energies below the delta resonance. Probabilities for observing three fragments with ~+ are not reproduced by a ternary fission application of the model found to work for binary fission.

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“…Some differences do however exist between the many available sets for each parameter and are understood as being due to differences in the fitting procedure, some small correction terms (e.g. angular transformation terms, Pauli blocking and Fermi averaging [45]) included or omitted by the various analyses or somewhat different As pointed out by several authors [37,45,53,54], the density regimes probed in pionic atoms and elastic pionnucleus scattering experiments are 0.5-0.75ρ 0 and 0.0-0.5ρ 0 , respectively. For the pionic atoms case also the momentum of the pion is drastically limited to p<0.050 GeV/c (or equivalently pion kinetic energies ω < 9 MeV).…”

Section: B the Pion Optical Potentialmentioning

confidence: 99%

Constraining the density dependence of the symmetry energy using the multiplicity and average pT ratios of charged pions

Cozma

2017

Phys. Rev. C

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The charged pion multiplicity ratio in intermediate energy heavy-ion collisions, a probe of the density dependence of symmetry energy above the saturation point, has been proven in a previous study to be extremely sensitive to the strength of the isovector ∆(1232) potential in nuclear matter. As there is no knowledge, either from theory or experiment, about the magnitude of this quantity, the extraction of constraints on the slope of the symmetry energy at saturation by using exclusively the mentioned observable is hindered at present. It is shown that, by including the ratio of average pT of charged pions pin the list of fitted observables, the noted problem can be circumvented. A realistic description of this observable requires accounting for the interaction of pions with the dense nuclear matter environment by the incorporation of the so called S-wave and P -wave pion optical potentials. This is performed within the framework of a quantum molecular dynamics transport model that enforces the conservation of the total energy of the system. It is shown that constraints on the slope of the symmetry energy at saturation density and the strength of the ∆(1232) potential can be simultaneously extracted. A symmetry energy with a value of the slope parameter L > 50 MeV is favored, at 1σ confidence level, from a comparison with published FOPI experimental data. A precise constraint will require experimental data more accurate than presently available, particularly for the charged pion multiplicity ratio, and better knowledge of the density and momentum dependence of the pion potential for the whole range of these two variables probed in intermediate energy heavy-ion collisions.

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High-energy pion-nucleus elastic scattering

Cited by 29 publications

References 45 publications

Intensity interferometry for a chaotic source with a collective flow and multiple scattering

Intensity interferometry for a chaotic source with a collective flow and multiple scattering

Mass and energy dependence of pion-induced fission

Constraining the density dependence of the symmetry energy using the multiplicity and average pT ratios of charged pions

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