Home > Publications database > Search for η-mesic ${}^{4}\text{He}$ in the $dd\to {}^{3}\text{He}n{\pi }^{0}$ and $dd\to {}^{3}\text{He}p{\pi }^{-}$ reactions with the WASA-at-COSY facility > print

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024 7 _ |a 10.1016/j.nuclphysa.2017.01.001
|2 doi
024 7 _ |a 0375-9474
|2 ISSN
024 7 _ |a 1873-1554
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024 7 _ |a WOS:000395211400007
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024 7 _ |a 2128/21099
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024 7 _ |a altmetric:13397368
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037 _ _ |a FZJ-2017-00616
082 _ _ |a 530
100 1 _ |a Adlarson, P.
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245 _ _ |a Search for η-mesic ${}^{4}\text{He}$ in the $dd\to {}^{3}\text{He}n{\pi }^{0}$ and $dd\to {}^{3}\text{He}p{\pi }^{-}$ reactions with the WASA-at-COSY facility
260 _ _ |a Amsterdam
|c 2017
|b North-Holland Publ. Co.
336 7 _ |a article
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336 7 _ |a ARTICLE
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336 7 _ |a JOURNAL_ARTICLE
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336 7 _ |a Journal Article
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520 _ _ |a The search for View the MathML sourceHe4-η bound states was performed with the WASA-at-COSY facility via the measurement of the excitation function for the View the MathML sourcedd→He3nπ0 and View the MathML sourcedd→He3pπ− processes. The deuteron beam momentum was varied continuously between 2.127 GeV/c and 2.422 GeV/c, corresponding to the excess energy for the View the MathML sourcedd→He4η reaction ranging from Q=−70 MeVQ=−70 MeV to Q=30 MeVQ=30 MeV. The luminosity was determined based on the View the MathML sourcedd→He3n reaction and the quasi-free proton–proton scattering via dd→ppnspectatornspectatordd→ppnspectatornspectator reactions. The excitation functions, determined independently for the measured reactions, do not reveal a structure which could be interpreted as a narrow mesic nucleus. Therefore, the upper limits of the total cross sections for the bound state production and decay in View the MathML sourcedd→(He4-η)bound→He3nπ0 and View the MathML sourcedd→(He4-η)bound→He3pπ− processes were determined taking into account the isospin relation between the both of the considered channels. The results of the analysis depend on the assumptions of the N⁎N⁎(1535) momentum distribution in the anticipated mesic-View the MathML sourceHe4. Assuming, as in the previous works, that this is identical with the distribution of nucleons bound with 20 MeV in View the MathML sourceHe4, we determined that (for the mesic bound state width in the range from 5 MeV to 50 MeV) the upper limits at 90% confidence level are about 3 nb and about 6 nb for nπ0nπ0 and pπ−pπ− channels, respectively. However, based on the recent theoretical findings of the N⁎N⁎(1535) momentum distribution in the View the MathML sourceN⁎-He3 nucleus bound by 3.6 MeV, we find that the WASA-at-COSY detector acceptance decreases and hence the corresponding upper limits are 5 nb and 10 nb for nπ0nπ0 and pπ−pπ− channels respectively.
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773 _ _ |a 10.1016/j.nuclphysa.2017.01.001
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