Hunting η-bound nuclei |
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作者单位: | Institut für Kernphysik,Forschungszentrum Jülich,52428 Jülich,Germany;Fakult(a)t für Physik,Universit(a)t Duisburg-Essen,Lotharstr.1,47048 Duisburg |
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摘 要: | The η meson can be bound to atomic nuclei.Experimental search is discussed in the form of final state interaction for the reactions dp → 3 Heη and dd → 4 Heη.For the latter case tensor polarized deuterons were used in order to extract the s-wave strength.For both reactions complex scattering lengths are deduced: a 3 Heη = ± 10.7±0.8 +0.1 -0.5 +i· 1.5±2.6 +1.0-0.9 fm and a 4 Heη = ±(3.1±0.5)+i·(0±0.5)] fm.In a two-nucleon transfer reaction under quasi-free conditions,p 27 Al → 3 HeX,was investigated.The system X can be the bound 25 Mg η at rest.When a possible decay of an intermediate N (1535) is required,a highly significant bump shows up in the missing mass spectrum.The data give for a bound state a binding energy of 13.3±1.6 MeV and a width of σ=4.4±1.3 MeV.
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关 键 词: | η meson production η nucleus interaction |
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