Elastic scattering of 19.5 and 30 MeV positive and negative pions from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>40</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Wright, D. H.; Blecher, M.; Ritchie, Barry; Rothenberger, D.; Burman, R. L.; Weinfeld, Z.; Escalante, J. A.; Mishra, C. S.; Whisnant, C. S.

doi:10.1103/physrevc.37.1155

Cited by 12 publications

(7 citation statements)

References 21 publications

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“…In the scattering scenario, unlike in the atomic case, one can study both charge states of the pion, thus increasing sensitivities to isovector effects and to the energy dependent effects due to the Coulomb interaction. Looking for earlier suitable data for elastic scattering, it was somewhat surprising to realize that at kinetic energies well below 50 MeV there seemed to be only one set of high quality data available for both charge states of the pion obtained in the same experiment, namely, the data of Wright et al [104] for 19.5 MeV pions on calcium, with predominantly the N = Z isotope 40 Ca. For that reason precision measurements of elastic scattering of 21.5 MeV π + and π − by several nuclei were performed very recently at PSI [32,33] with the aim of analyzing the results in terms of the same effects as found in pionic atoms.…”

Section: E Pion Elastic Scatteringmentioning

confidence: 99%

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In-medium nuclear interactions of low-energy hadrons

2007

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Experimental and theoretical developments of the last decade in the study of exotic atoms and some related low-energy reactions are reviewed, in order to provide information on the in-medium hadron-nucleon t matrix over a wide range of densities up to central nuclear densities. In particular, we review pionic deeply bound atomic states and related evidence for partial restoration of chiral symmetry in dense nuclear matter. The case for relatively narrow deeply bound atomic states for antikaons and antiprotons is made, based on the physics of strong nuclear absorption. Recent experimental suggestions for signals of antikaon-nuclear deeply bound states are reviewed, and dynamical models for calculating binding energies, widths and densities of antikaon nuclear states are discussed. Specific features of low-energy in-medium interactions of kaons, antiprotons and of Sigma hyperons are discussed, and suggestions to study experimentally Cascade atoms are reviewed.Comment: 86 pages, 44 figures, slight revisions, references added, Physics Reports (in press

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Section: E Pion Elastic Scatteringmentioning

confidence: 99%

“…[188]. We have therefore used 17 values of absorption ratios for the following nuclei: 48 Ca, 58 Ni, 96 Zr, 100 Mo, 96,104 Ru, 116 Cd, 124 Sn, 128,130 Te, 144,154 Sm, 148 Nd, 160 Gd, 176 Yb, 232 Th and 238 U.…”

Section: B Antiprotonic Atom Datamentioning

confidence: 99%

In-medium nuclear interactions of low-energy hadrons

2007

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“…With the large number of scattering experiments performed in the first two decades of the 'pion factories', it is somewhat surprising to realize that at kinetic energies well below 50 MeV there seems to be only one set of high quality data available for both charge states of the pion obtained in the same experiment, namely, the data of Wright et al [23] for 19.5 MeV pions on calcium. We have therefore performed precision measurements of elastic scattering of 21.5 MeV π + and π − on several nuclei in order to provide the necessary data.…”

Section: Introductionmentioning

confidence: 99%

Elastic scattering of low energy pions by nuclei and the in-medium isovectorπNamplitude

et al. 2005

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Measurements of elastic scattering of 21.5 MeV π ± by Si, Ca, Ni and Zr were made using a single arm magnetic spectrometer. Absolute calibration was made by parallel measurements of Coulomb scattering of muons. Parameters of a pion-nucleus optical potential were obtained from fits to all eight angular distributions put together. The 'anomalous' s-wave repulsion known from pionic atoms is clearly observed and could be removed by introducing a chiral-motivated density dependence of the isovector scattering amplitude, which also greatly improved the fits to the data. The empirical energy dependence of the isoscalar amplitude also improves the fits to the data but, contrary to what is found with pionic atoms, on its own is incapable of removing the anomaly.

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“…The term with α(r) is referred to as the p-wave potential, see Eqs. (20)(21)(22) of [2]. Values of the various parameters of the potential are obtained from fits to experimentally determined strong interaction level shifts and widths and 'upper' level yields.…”

mentioning

confidence: 99%

“…Other p-wave parameters were held fixed at c 0 =0.22m −3 π , c 1 =0.18m −3 π and ξ=1. The free pion-nucleon values [5] are b 0 = −0.0001 +0.0009 −0.0021 m −1 π and b 1 = −0.0885 +0.0010 −0.0021 m −1 π potential [22]. Solid lines: potential CB of Table I, dashed lines: potential WB of the table.…”

mentioning

confidence: 99%

Indications of partial chiral symmetry restoration from pionic atoms

Friedman

2002

Physics Letters B

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Extensive data on strong interaction effects in pionic atoms are analyzed with a density-dependent isovector scattering amplitude suggested recently by Weise to result from a density dependence of the pion decay constant. Most of the so-called 'missing s-wave repulsion' is removed when adopting this approach, thus indicating a partial chiral symmetry restoration in dense matter. The resulting potentials describe quite well also elastic scattering of 20 MeV pions on Ca. Further tests with elastic scattering are desirable. P ACS: 13.75.Gx; 25.80Dj

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Elastic scattering of 19.5 and 30 MeV positive and negative pions fromCa40

Cited by 12 publications

References 21 publications

In-medium nuclear interactions of low-energy hadrons

In-medium nuclear interactions of low-energy hadrons

Elastic scattering of low energy pions by nuclei and the in-medium isovectorπNamplitude

Indications of partial chiral symmetry restoration from pionic atoms

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