Cross section and tensor analysing power of the reaction near threshold

Budzanowski, A.; Chatterjee, A.; Gebel, R.; Hawranek, P.; Jahn, R.; Jha, V.; Kilian, K.; Kliczewski, S.; Kirillov, Da.; Кириллов, Д. А.; Kolev, D.; Kravčíková, M.; Lesiak, M.; Lieb, J.; Machner, H.; Magiera, A.; Maier, R.; Martinská, G.; Nedev, S.; Пискунов, Н. М.; Prasuhn, D.; Protić, D.; Ritman, J.; Rossen, P. von; Roy, B. J.; Sitnik, I.M.; Siudak, R.; Tsenov, R.; Urbán, J.; Vankova, G.; Wilkin, C.

doi:10.1016/j.nuclphysa.2009.02.004

Cited by 26 publications

(55 citation statements)

References 29 publications

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“…It turns out that the new data do not fully agree with each other and that still not enough observables are known to extract the s wave amplitudes. The situation is slightly better for the η 4 He final state, which has been studied in d + d interactions making use of unpolarised beams [73], [119], [118] as well as polarised beams [120]. The number of measured points is not sufficient yet to also extract the effective range with sufficient certainty from the data.…”

Section: Discussionmentioning

confidence: 99%

“…(78) to the data of Ref. [120]. Since |C| was found to be zero within error bars, it was put exactly to zero.…”

Section: The Reaction D + D → η+ 4 Hementioning

confidence: 96%

“…Measurements of reaction d + d → η+ 4 He were reported in [118], [119], [73] and more recently in [120]. The last one is here sometimes also called GEM data.…”

Section: The Reaction D + D → η+ 4 Hementioning

confidence: 99%

“…The problem could be only solved by applying polarised deuterons. Such an experiment was performed by the GEM collaboration at COSY Jülich [120] which will be discussed now in some detail.…”

Section: The Reaction D + D → η+ 4 Hementioning

confidence: 99%

“…[120] had full polar angle θ η acceptance only in the range (π − 1)/2 to (π + 1)/2. Integration over this range leads to cos φ η dφ η = −0.03, i.e.…”

Section: The Reaction D + D → η+ 4 Hementioning

confidence: 99%

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Search for quasi boundηmesons

Machner

2015

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

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The search for a quasi bound η meson in atomic nuclei is reviewed. This tentative state is studied theoretically as well as experimentally. The theory starts from elastic η nucleon scattering which is derived from production data within some models. From this interaction the η nucleus interaction is derived. Model calculations predict binding energies and widths of the quasi bound state. Another method is to derive the η nucleus interaction from excitation functions of η production experiments. The s wave interaction is extracted from such data via final state interaction theorem. We give the derivation of s wave amplitudes in partial wave expansion and in helicity amplitudes and their relation to observables. Different experiments extracting the final state interaction are discussed as are production experiments. So far only three experiments give evidence for the existence of the quasi bound state: a pion double charge exchange experiment, an effective mass measurement, and a transfer reaction at recoil free kinematics with observation of the decay of the state.

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Section: Discussionmentioning

confidence: 99%

“…(78) to the data of Ref. [120]. Since |C| was found to be zero within error bars, it was put exactly to zero.…”

Section: The Reaction D + D → η+ 4 Hementioning

confidence: 96%

“…Measurements of reaction d + d → η+ 4 He were reported in [118], [119], [73] and more recently in [120]. The last one is here sometimes also called GEM data.…”

Section: The Reaction D + D → η+ 4 Hementioning

confidence: 99%

Section: The Reaction D + D → η+ 4 Hementioning

confidence: 99%

“…[120] had full polar angle θ η acceptance only in the range (π − 1)/2 to (π + 1)/2. Integration over this range leads to cos φ η dφ η = −0.03, i.e.…”

Section: The Reaction D + D → η+ 4 Hementioning

confidence: 99%

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Search for quasi boundηmesons

Machner

2015

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

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Few-Body Aspects of the Near Threshold Pseudoscalar Meson Production

Moskal

2014

Few-Body Syst

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During the last decade large samples of data have been collected on the production of the groundstate pseudoscalar mesons in collisions of proton or deuteron beam with hydrogen or deuterium target. These measurements have been performed in the vicinity of the kinematical threshold for meson production where only a few partial waves in both initial and final state are expected to contribute to the production process. This simplifies significantly the interpretation of the data, yet still appears to be challenging due to the three or four particle final state systems with a complex hadronic potential. We review experiments and phenomenology of the near threshold production of the ground-state mesons in the few-body final states as for example: nucleus-meson and nucleon-nucleon-meson, and report on the status of the search of the mesic-nuclei (a meson-nucleus bound states). Experimental advantages of measurements close to the kinematical threshold are discussed, and general features of the production mechanism of the η and η mesons in the nucleon-nucleon collisions are presented emphasising results of measurements of spin and isospin dependence of the production cross sections.

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Status of the Search for $$\eta $$-Mesic Nuclei with Particular Focus on $$\eta $$-Helium Bound States

Skurzok

2021

Few-Body Syst

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Cross section and tensor analysing power of the reaction near threshold

Cited by 26 publications

References 29 publications

Search for quasi boundηmesons

Search for quasi boundηmesons

Few-Body Aspects of the Near Threshold Pseudoscalar Meson Production

Status of the Search for $$\eta $$-Mesic Nuclei with Particular Focus on $$\eta $$-Helium Bound States

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