Coherent photoproduction of η-mesons off 3He

6533b7ddfe1ef96bd127498a

RESEARCH PRODUCT

Coherent photoproduction of η-mesons off 3He – search for η-mesic nuclei

D. I. Glazier A. Nikolaev B. M. K. Nefkens D. Howdle M. Ostrick I. Jaegle R. Kondratiev B. Boillat J. Ahrens D. P. Watts J. C. Mcgeorge R. Beck A. Starostin A. Polonski A. Kulbardis Yasser Maghrbi D. M. Manley M. Korolija V. L. Kashevarov V. L. Kashevarov P. A. Bartolome K. Bantawa B. Demissie D. I. Sober V. S. Bekrenev B. Oussena B. Oussena D. Werthmüller I. J. D. Macgregor S. Schumann R. W. Novotny B. Krusche E. F. Mcnicoll J. R. M. Annand M. Martinez S. N. Prakhov J. Robinson Volker Metag Jason Brudvik I. Keshelashvili E. Heid W. J. Briscoe A. N. Mushkarenkov D. Hornidge F. Pheron G. Rosner P. Pedroni M. Dieterle E. J. Downie E. J. Downie E. J. Downie Andy Thomas M. Thiel Sasa Micanovic M. Kotulla M. Kotulla Z. Marinides M. Unverzagt J. Mancell F. Zehr S. P. Kruglov T. Rostomyan P. Drexler I. Supek M. H. Sikora Lilian Witthauer M. Oberle S. Cherepnya D. G. Middleton L.v. Filʼkov V. Lisin O. Jahn D. Mekterovic A. Braghieri D. Branford H. Berghäuser K. Livingston T. C. Jude H. J. Arends

subject

Physics Excitation function Nuclear and High Energy Physics Particle physics Meson High Energy Physics::Phenomenology Hadron Gamma ray FOS: Physical sciences Baryon Nuclear physics High Energy Physics::Experiment Nuclear Experiment (nucl-ex)total cross section ; photoproduction ; eta meson ; final-state interaction ; Crystal Ball ; MAMI Nucleon Nuclear Experiment Nuclear Experiment Isotopes of helium Crystal Ball

description

Coherent photoproduction of $\eta$-mesons off $^3$He, i.e. the reaction $\gamma ^3{He}\rightarrow \eta ^3{He}$, has been investigated in the near-threshold region. The experiment was performed at the Glasgow tagged photon facility of the Mainz MAMI accelerator with the combined Crystal Ball - TAPS detector. Angular distributions and the total cross section were measured using the $\eta\rightarrow \gamma\gamma$ and $\eta\rightarrow 3\pi^0\rightarrow 6\gamma$ decay channels. The observed extremely sharp rise of the cross section at threshold and the behavior of the angular distributions are evidence for a strong $\eta {^3{He}}$ final state interaction, pointing to the existence of a resonant state. The search for further evidence of this state in the excitation function of $\pi^0$-proton back-to-back emission in the $\gamma ^3{He}\rightarrow \pi^0 pX$ reaction revealed a very complicated structure of the background and could not support previous conclusions.

year	journal	country	edition	language
2012-03-01

10.1016/j.physletb.2012.01.075 https://doi.org/10.1016/j.physletb.2012.01.075