Browsing by Author "Gebel R."

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    Cross section and tensor analysing power of the d d → η α reaction near threshold
    (2009-04-15) Budzanowski A.; Chatterjee A.; Gebel R.; Hawranek P.; Jahn R.; Jha V.; Kilian K.; Kliczewski S.; Kirillov D.; Kirillov D.; Kolev D.; Kravcikova M.; Lesiak M.; Lieb J.; Machner H.; Magiera A.; Maier R.; Martinska G.; Nedev S.; Piskunov N.; Prasuhn D.; Protić D.; Ritman J.; von Rossen P.; Roy B.J.; Sitnik I.; Siudak R.; Tsenov R.; Urban J.; Vankova G.; Wilkin C.
    The angular distributions of the unpolarised differential cross section and tensor analysing power Ax x of the over(d, →) d → α η reaction have been measured at an excess energy of 16.6 MeV. The ambiguities in the partial-wave description of these data are made explicit by using the invariant amplitude decomposition. This allows the magnitude of the s-wave amplitude to be extracted and compared with results published at lower energies. In this way, firmer bounds could be obtained on the scattering length of the ηα system. The results do not, however, unambiguously prove the existence of a quasi-bound ηα state. © 2009 Elsevier B.V. All rights reserved.