/ Experiment-Nucl arXiv:0812.4187

Search for eta-mesic nuclei in recoil-free transfer reaction

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

Published in: Phys.Rev.
Year: 2009
Vol.: C79
Page No: 012201
Pages: 10

Abstract: We have studied the reaction $p+{^{27}Al}\to {^3{He}}+p+\pi^-+X$ at recoil-free kinematics. An $\eta$ meson possibly produced in this reaction would be thus almost at rest in the laboratory system and could therefore be bound with high probability, if nuclear $\eta$ states exist. The decay of such a state through the $N^*(1535)$ resonance would lead to a proton-$\pi^-$ pair emitted in opposite directions. For these conditions we find some indication of such a bound state. An upper limit of $\approx$ 0.5 nb is found.

Web-Page: http://inspirebeta.net/record/805953/files/DE_TOF_Enstar.png; http://inspirebeta.net/record/805953/files/Fig2b.png; http://inspirebeta.net/record/805953/files/Fig3b.png

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