Data Entry: Please note that the research database will be replaced by UNIverse by the end of October 2023. Please enter your data into the system https://universe-intern.unibas.ch. Thanks
Experimental constraints on the omega-nucleus real potential
Journal
Physics letters. B
Volume
736
Pages / Article-Number
26-32
Abstract
In a search for omega mesic states, the production of omega-mesons in coincidence with forward going protons has been studied in photon induced reactions on C-12 for incident photon energies of 1250-3100 MeV. The pi(0)gamma pairs from decays of bound or quasi-free omega-mesons have been measured with the CBELSA/TAPS detector system in coincidence with protons registered in the MiniTAPS forward array. Structures in the total energy distribution of the pi(0)gamma pairs, which would indicate the population and decay of bound omega B-11 states, are not observed. The pi(0)gamma cross section of 0.3 nbMeV(-1) sr(-1) observed in the bound state energy regime between -100 and 0 MeV may be accounted for by yield leaking into the bound state regime because of the large in-medium width of the omega-meson. A comparison of the measured total energy distribution with calculations suggests the real part V-0 of the omega B-11 potential to be small and only weakly attractive with V-0(rho = rho(0)) = -15 +/- 35(stat) +/- 20(syst) MeV in contrast to some theoretical predictions of attractive potentials with a depth of 100-150 MeV. (C) 2014 The Authors. Published by Elsevier B.V.
