Cross section and tensor analysing power of the dd -&gt; eta alpha reaction near threshold

Budzanowski, A.; et, al.; Chatterjee, A.; Gebel, R.

doi:10.1016/j.nuclphysa.2009.02.004

Journal Article

PreJuSER-8499

Cross section and tensor analysing power of the dd -> eta alpha reaction near threshold

Budzanowski, A. ; Chatterjee, A. ; Gebel, R.FZJ* ; et, a.FZJ*

2009
North-Holland Publ. Co. Amsterdam

Nuclear physics <Amsterdam> / A 821, (2009) [10.1016/j.nuclphysa.2009.02.004]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10440 doi:10.1016/j.nuclphysa.2009.02.004

Abstract: The angular distributions of the unpolarised differential cross section and tensor analysing power A(xx) of the (d) over right arrowd -> alpha eta 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 eta alpha system. The results do not, however, unambiguously prove the existence of a quasi-bound eta alpha state. (C) 2009 Elsevier B.V. All rights reserved.

Keyword(s): deuteron deuteron: exclusive reaction ; eta: hadroproduction ; helium: hadroproduction ; deuteron: polarized beam ; analyzing power: tensor ; angular distribution ; partial wave analysis ; scattering length: (eta nucleus) ; bound state: (eta nucleus) ; Juelich COSY PS ; deuteron deuteron --> helium eta ; 1.193 GeV/nucleon ; Meson production (auto) ; Polarised deuterons (auto) ; Eta-nucleus quasi-bound states (auto)

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Note: We are grateful to the COSY crew for providing quality deuteron beams. Discussions with A. Wronska were helpful. We appreciate the support received from the European community research infrastructure activity under the FP6 "Structuring the European Research Area" programme, contract No. RII3-CT-2004-506078, from the Indo-German bilateral agreement, from the Research Centre Julich (FFE), and from GAS Slovakia (1/4010/07).

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