THRESHOLD STRUCTURE OF THE QUASI-FREE P-]D+ETA REACTION(N)

Authors
CALEN H DYRING J FRANSSON K GUSTAFSSON L HAGGSTROM S HOISTAD B JOHANSON J JOHANSSON A JOHANSSON T KHOUKAZ A KULLANDER S RUBER RJMY ZLOMANCZUK J MOROSOV B POVTOREJKO A SUKHANOV A ZERNOV A KUPSC A MARCINIEWSKI P STEPANIAK J BILGER R BRODOWSKI W CLEMENT H WAGNER GJ EKSTROM C ZABIEROWSKI J BONDAR A KUZMIN A SHWARTZ B SIDOROV V SUKHANOV A TUROWIECKI A WILHELMI Z KILIAN K OELERT W SEFZICK T SOPOV V TCHERNYCHEV V
Citation
H. Calen et al., THRESHOLD STRUCTURE OF THE QUASI-FREE P-]D+ETA REACTION(N), Physical review letters, 80(10), 1998, pp. 2069-2072
Citations number
13
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
80
Issue
10
Year of publication
1998
Pages
2069 - 2072
Database
ISI
SICI code
0031-9007(1998)80:10<2069:TSOTQP>2.0.ZU;2-N
Abstract
The quasifree p + n --> d + eta reaction cross section has been measur ed at the threshold using 1295 MeV protons in the CELSIUS storage ring and an internal cluster-jet deuterium target. The kinematics is chose n such that the target proton can be assumed to be a spectator. The Fe rmi momentum of the target neutron is used to extract the energy depen dence of the cross section by reconstructing the kinematics on an even t-by-event basis. The data cover excess energies from threshold to 10 MeV in the center of mass of the final d eta system. Approaching the t hreshold the cross section is enhanced compared to what is expected fr om phase space. This behavior is typical for a strong final-state inte raction.