000826388 001__ 826388 000826388 005__ 20250129092502.0 000826388 0247_ $$2doi$$a10.1016/j.nuclphysa.2017.01.001 000826388 0247_ $$2ISSN$$a0375-9474 000826388 0247_ $$2ISSN$$a1873-1554 000826388 0247_ $$2WOS$$aWOS:000395211400007 000826388 0247_ $$2Handle$$a2128/21099 000826388 0247_ $$2altmetric$$aaltmetric:13397368 000826388 037__ $$aFZJ-2017-00616 000826388 082__ $$a530 000826388 1001_ $$0P:(DE-HGF)0$$aAdlarson, P.$$b0 000826388 245__ $$aSearch 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 000826388 260__ $$aAmsterdam$$bNorth-Holland Publ. Co.$$c2017 000826388 3367_ $$2DRIVER$$aarticle 000826388 3367_ $$2DataCite$$aOutput Types/Journal article 000826388 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1484762856_22329 000826388 3367_ $$2BibTeX$$aARTICLE 000826388 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000826388 3367_ $$00$$2EndNote$$aJournal Article 000826388 520__ $$aThe search for View the MathML sourceHe4-η bound states was performed with the WASA-at-COSY facility via the measurement of the excitation function for the View the MathML sourcedd→He3nπ0 and View the MathML sourcedd→He3pπ− processes. The deuteron beam momentum was varied continuously between 2.127 GeV/c and 2.422 GeV/c, corresponding to the excess energy for the View the MathML sourcedd→He4η reaction ranging from Q=−70 MeVQ=−70 MeV to Q=30 MeVQ=30 MeV. The luminosity was determined based on the View the MathML sourcedd→He3n reaction and the quasi-free proton–proton scattering via dd→ppnspectatornspectatordd→ppnspectatornspectator reactions. The excitation functions, determined independently for the measured reactions, do not reveal a structure which could be interpreted as a narrow mesic nucleus. Therefore, the upper limits of the total cross sections for the bound state production and decay in View the MathML sourcedd→(He4-η)bound→He3nπ0 and View the MathML sourcedd→(He4-η)bound→He3pπ− processes were determined taking into account the isospin relation between the both of the considered channels. The results of the analysis depend on the assumptions of the N⁎N⁎(1535) momentum distribution in the anticipated mesic-View the MathML sourceHe4. Assuming, as in the previous works, that this is identical with the distribution of nucleons bound with 20 MeV in View the MathML sourceHe4, we determined that (for the mesic bound state width in the range from 5 MeV to 50 MeV) the upper limits at 90% confidence level are about 3 nb and about 6 nb for nπ0nπ0 and pπ−pπ− channels, respectively. However, based on the recent theoretical findings of the N⁎N⁎(1535) momentum distribution in the View the MathML sourceN⁎-He3 nucleus bound by 3.6 MeV, we find that the WASA-at-COSY detector acceptance decreases and hence the corresponding upper limits are 5 nb and 10 nb for nπ0nπ0 and pπ−pπ− channels respectively. 000826388 536__ $$0G:(DE-HGF)POF3-612$$a612 - Cosmic Matter in the Laboratory (POF3-612)$$cPOF3-612$$fPOF III$$x0 000826388 588__ $$aDataset connected to CrossRef 000826388 693__ $$0EXP:(DE-Juel1)WASA-at-COSY-20170712$$5EXP:(DE-Juel1)WASA-at-COSY-20170712$$eWASA (Wide Angle Shower Apparatus) at COSY$$x0 000826388 7001_ $$0P:(DE-HGF)0$$aAugustyniak, W.$$b1 000826388 7001_ $$0P:(DE-HGF)0$$aBardan, W.$$b2 000826388 7001_ $$0P:(DE-HGF)0$$aBashkanov, M.$$b3 000826388 7001_ $$0P:(DE-HGF)0$$aBergmann, F. 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