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Author  |
η-PRiME and Super-FRS Collaborations (Sekiya, R. et al); Benlliure, J. |
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Title |
Excitation Spectra of the 12C(p, d) Reaction near the η′-Meson Emission Threshold Measured in Coincidence with High-Momentum Protons |
Type |
Journal Article |
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Year |
2026 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys. Rev. Lett. |
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Volume |
136 |
Issue |
14 |
Pages |
142501 - 6pp |
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Abstract |
The missing mass of the C-12(p, d) reaction has been measured near the eta '-meson emission threshold in coincidence with a high-momentum proton to selectively collect eta '-C-11 mesic nucleus formation events at GSI, Germany. A 2.5 GeV proton excites a carbon nucleus in order to form an eta '-mesic nucleus emitting a deuteron forward with an energy of similar to 1.5 GeV. The deuteron is momentum analyzed by the fragment separator used as a high-resolution spectrometer to deduce the excitation energy of the residual system. The large-acceptance detector WASA surrounding the target identifies high-momentum protons emitted in the decay of the eta '-mesic nucleus. The measured semiexclusive spectrum exhibits structures below the threshold though the statistical significance is limited. The spectrum is fitted by theoretically calculated spectra varying optical-potential parameters of the eta '-nucleus interaction. The analysis results indicate possible formation of eta '-mesic nuclei for the real potential depth of similar to- 61 MeV with a local statistical significance of 3.5 sigma and, taking into account the look-elsewhere effect, a global significance of 2.1 sigma. |
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Address |
[Sekiya, R.] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan, Email: itahashi@phys.sci.osaka-u.ac.jp; |
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Publisher |
Amer Physical Soc |
Place of Publication |
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Language |
English |
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Original Title |
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Series Volume |
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Edition |
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ISSN |
0031-9007 |
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Notes |
WOS:001746858000001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7205 |
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