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eta meson production in p d and p p collisions

Chiavassa, E. ; Dellacasa, G. ; De Marco, N. ; et al.

Phys.Lett.B 337 (1994) 192-195, 1994.

Inspire Record 384615 DOI 10.17182/hepdata.28780

The doubly-differential cross sections for the pp → ppη and pd → ηX reactions have been measured at incident proton energies of 1.3 and 1.5 GeV. The ratio of the pd to pp -induced cross sections varies from about 8–10 at 1.3 GeV to 4.5–6 at 1.5 GeV in the η kinetic energy interval 100 MeV ⩽ T η ⩽220 MeV. Information on the pn → ηX reaction has been extracted from these measurements within the framework of a simple folding model.

8 data tables

Table 1

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Table 2

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Table 3

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Deuteron production in alpha nucleus collisions from 200-MeV to 800-MeV per nucleon

Montarou, G. ; Alard, J.P. ; Augerat, J. ; et al.

Phys.Rev.C 44 (1991) 365-383, 1991.

Inspire Record 28947 DOI 10.17182/hepdata.26158

Deuteron spectra at laboratory angles from 30° to 90° were measured in α+(Pb, Cu, and C) collisions at 800, 600, and 200 MeV/nucleon, and α+(Pb and C) collisions at 400 MeV/nucleon. The coalescence relation between protons and deuterons was examined for the inclusive part of the spectra. The size of the interacting region was evaluated from the observed coalescence coefficients. The rms radius is typically 4–5 fm, depending of the target mass. The proton and deuteron energy spectra corresponding to central collisions were fitted assuming emission from a single source moving with a velocity intermediate between that of the projectile and the target. The extracted ‘‘temperatures’’ are independent of the nature of the emitted particle, indicating that the fragments have a common source. The best fits were achieved for 200- and 400-MeV/nucleon reactions. Spectra of deuteron-like pairs, including real deuterons and neutron-proton pairs that may be contained in a larger nuclear cluster, are compared to the prediction of an intranuclear cascade model incorporating a clustering algorithm based on a classical coalescence prescription. Best agreements between experimental and predicted deuteron-like spectra occur for 800- and 600-MeV/nucleon collisions.

3 data tables

Table 1

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Table 2

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Table 3

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