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Experimental constraints on the ω–nucleus real potential
- Source :
- PHYSICS LETTERS B, Physics Letters B, Vol 736, Iss C, Pp 26-32 (2014), Physics Letters B
- Publication Year :
- 2014
- Publisher :
- Elsevier BV, 2014.
-
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 $^{12}$C 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 $\omega~^{11}$B states, are not observed. The $\pi^0 \gamma$ cross section of 0.3 nb/MeV/sr 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 $\omega~^{11}$B potential to be small and only weakly attractive with $V_0(\rho=\rho_0) = -15\pm$ 35(stat) $\pm$20(syst) MeV in contrast to some theoretical predictions of attractive potentials with a depth of 100 - 150 MeV.<br />Comment: 13 pages, 8 figures
Details
- ISSN :
- 03702693
- Volume :
- 736
- Database :
- OpenAIRE
- Journal :
- Physics Letters B
- Accession number :
- edsair.doi.dedup.....32e56499af16f7de995257ec7ecc1ec4
- Full Text :
- https://doi.org/10.1016/j.physletb.2014.07.004