Physics at CELSIUS and COSY

Machner, H.

doi:10.1063/1.2176481

Cited by 1 publication

(1 citation statement)

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“…The uncertainty in the origin of the higher partial waves is reflected in the estimation of the η α scattering length from the data. Fixing the position of the pole in the η α scattering amplitude, which determines whether or not there is a quasi-bound state, requires an even more extensive data set, including especially more measurements with a polarised deuteron beam [32], as well as data from below the ηα threshold analogous to the studies for the η 3 He system described in ref. [19].…”

Section: Discussionmentioning

confidence: 99%

Near-threshold η-meson production in the dd↦He η reaction

et al. 2005

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Abstract. The dd → 4 He η reaction has been investigated near threshold using the ANKE facility at COSY-Jülich. Both total and differential cross sections have been measured at two excess energies, Q = 2.6 MeV and 7.7 MeV, with a subthreshold measurement being undertaken at Q = −2.6 MeV to study the physical background. While consistent with isotropy at the lower energy, the angular distribution reveals a pronounced anisotropy at the higher one, indicating the presence of higher partial waves. Options for the decomposition into partial amplitudes and their consequences for determination of the s-wave η-α scattering length are discussed.PACS. 13.60.Le meson production -25.10.+s nuclear reaction involving few-nucleons systems -25.45.-z 2 H induced reactions -11.80.Et partial-wave analysis

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Section: Discussionmentioning

confidence: 99%