Status and perspectives of the search for Eta-Mesic nuclei

Moskal, P.; Skurzok, M.; Krzemień, W.

doi:10.1063/1.4955353

Cited by 9 publications

(9 citation statements)

References 62 publications

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“…In the case of η-mesic nuclei, the ηN interaction happens at subthreshold energies and F ηN should be evaluated at an energy shifted by an amount δ below threshold. The importance of taking such a downward shift into account has been discussed with different points of view in literature [59,60,61,62]. The authors in [59,60] (and references therein) provide a detailed analysis of this topic and derive an expression for δ which depends on the nuclear binding energy per nucleon as well as the real part of the optical potential itself.…”

Section: Subthreshold Considerations and Uncertaintiesmentioning

confidence: 99%

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Constraining the optical potential in the search for η-mesic 4He

et al. 2018

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A consistent description of the dd → 4 Heη and dd → ( 4 Heη) bound → X cross sections was recently proposed with a broad range of real (V 0 ) and imaginary (W 0 ), η-4 He optical potential parameters leading to a good agreement with the dd → 4 Heη data. Here we compare the predictions of the model below the η production threshold, with the WASA-at-COSY excitation functions for the dd → 3 HeN π reactions to put stronger constraints on (V 0 , W 0 ). The allowed parameter space (with |V 0 | < ∼ 60 MeV and |W 0 | < ∼ 7 MeV estimated at 90% CL ) excludes most optical model predictions of η− 4 He nuclei except for some loosely bound narrow states.

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Section: Subthreshold Considerations and Uncertaintiesmentioning

confidence: 99%

“…Refs. [61,62], however, provide a simpler method with δ given by the average binding of the target nucleons.…”

Section: Subthreshold Considerations and Uncertaintiesmentioning

confidence: 99%

Constraining the optical potential in the search for η-mesic 4He

et al. 2018

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“…In 2008 and 2010 we performed the measurements dedicated to search for the 4 He-η bound states in deuteron-deuteron fusion reaction [47,49]. The η-mesic nuclei were searched via studying of excitation function for the dd → 3 Hepπ − (2008 and 2010) [5,50,51] and dd → 3 Henπ 0 [50,52] (2010) reactions in the vicinity of the 4 Heη threshold.…”

Section: Results For the Search Of 4 He-η Mesic Nucleimentioning

confidence: 99%

“…Also another international collaborations perform experimental searches for η and η ′ -mesic nuclei [49] in hadro-and photo-production reactions [57,58]. The Eta-prime/Super-FRS collaboration for the first time have performed the search for η ′ -mesic bound statess in inclusive measurement of the 12 C(p,d) process [59,60] while, at J-PARC the search for η-mesic nuclei is planned in pion induced reaction [61].…”

Section: Perspectivesmentioning

confidence: 99%

Recent Results from WASA-at-COSY

Clement¹,

Moskal²,

Skurzok³

2017

Proceedings of the 14th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2016)

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The detector system WASA-at-COSY has been operated at the Cooler Synchrotron COSY in the years from 2006 till 2015. In this article we report on recent results of the analyses of the meson production reactions in nucleon-nucleon, nucleon-deuteron and deuteron-deuteron collisions with spin-polarized and unpolarized beams emphasizing the evidences for the existence of the dibaryon state in the proton-neutron system and the perspectives for the search of the η-mesic helium.

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“…However, despite many experiments performed, there is still no clear evidence of their existence [35][36][37][38][39][40][41][42]. The interested reader can find recent reviews on the η mesic bound state searches in Refs [6,7,16,18,30,[45][46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Search for the η-mesic bound states with the WASA-at-COSY detector

Skurzok

2019

EPJ Web Conf.

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The experiments dedicated to the search for η-mesic Helium were performed with high statistics using WASA detection setups installed at the COSY accelerator in the Research Center Juelich. The search for the η-mesic bound states is conducted via the measurement of the excitation function for selected decay channels of the He-η systems using unique ramped beam technique. This report presents recent status of the data analysis.

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Status and perspectives of the search for Eta-Mesic nuclei

Abstract: Abstract.In this report the search for η-mesic nuclei is reviewed. The brief description of the experimental studies is presented with a focus on the possible production of the η-nucleus bound states for light nuclei like He.

Cited by 9 publications

References 62 publications

Constraining the optical potential in the search for η-mesic 4He

Constraining the optical potential in the search for η-mesic 4He

Recent Results from WASA-at-COSY

Search for the η-mesic bound states with the WASA-at-COSY detector

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