/ Experiment-Nucl arXiv:0811.3372

Cross Section and Tensor Analysing Power of the dd ---> eta alpha Reaction Near Threshold

Budzanowski, A. (Cracow, INP) ; Chatterjee, A. (Bhabha Atomic Res. Ctr.) ; Gebel, R. (JCHP, Julich) ; Hawranek, P. (Jagiellonian U.) ; Jahn, R. (Bonn U., HISKP) ; Jha, V. (Bhabha Atomic Res. Ctr.) ; Kilian, K. (JCHP, Julich) ; Kliczewski, S. (Cracow, INP) ; Kirillov, Da. (Essen U.) ; Kirillov, Di. (Dubna, JINR) ; Kolev, D. (Sofiya U.) ; Kravcikova, M. (Kosice Tech. U.) ; Lesiak, M. (JCHP, Julich) ; Lieb, J. (George Mason U.) ; Machner, H. (Essen U.) ; Magiera, A. (Jagiellonian U.) ; Maier, R. (JCHP, Julich) ; Martinska, G. (Kosice U.) ; Nedev, S. (Chem. Tech. Metal. U., Sofia) ; Piskunov, N. (Dubna, JINR) ; Prasuhn, D. (JCHP, Julich) ; Protic, D. (JCHP, Julich) ; Ritman, J. (JCHP, Julich) ; von Rossen, P. (JCHP, Julich) ; Roy, B.J. (Bhabha Atomic Res. Ctr.) ; Sitnik, I. (Dubna, JINR) ; Siudak, R. (Bonn U., HISKP) ; Tsenov, R. (Sofiya U.) ; Urban, J. (Kosice U.) ; Vankova, G. (Sofiya U.) ; Wilkin, C. (University Coll. London)

Published in: Nucl.Phys.
Year: 2009
Vol.: A821
Page No: 193-209
Pages: 20

Abstract: The angular distributions of the unpolarised differential cross section and tensor analysing power $A_{xx}$ of the $\vec{d}d\to\alpha \eta$ 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.

Keyword(s): Meson production ; Polarised deuterons ; Eta-nucleus quasi-bound states

Web-Page: http://durpdg.dur.ac.uk/cgi-hepdata/hepreac/8061823; http://inspirebeta.net/record/803178/files/compare_Wro_Mariola.png; http://inspirebeta.net/record/803178/files/ds_Ayy_fits.png; http://inspirebeta.net/record/803178/files/exfu.png; http://inspirebeta.net/record/803178/files/f_s2.png; http://inspirebeta.net/record/803178/files/lesiak_fig2.png; http://inspirebeta.net/record/803178/files/lesiak_fig4.png; http://inspirebeta.net/record/803178/files/lumi_scaled1.png; http://inspirebeta.net/record/803178/files/m_scaled.png; http://inspirebeta.net/record/803178/files/mm_unpol_allcos.png; http://inspirebeta.net/record/803178/files/momo_dp71.png; http://inspirebeta.net/record/803178/files/param_pol1.png; http://inspirebeta.net/record/803178/files/param_pol3.png; http://inspirebeta.net/record/803178/files/phi_cos_lines.png

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