Precision study of the eta-3He system using the d+p->3He+eta reaction

Authors :: Mersmann, T.
Alfons Khoukaz
Maeda, Y.
Mielke, M.
Mikirtychiants, S.
Ohm, H.
Papenbrock, M.
Prasuhn, D.
Rathmann, F.
Rausmann, T.
Schleichert, R.
Serdyuk, V.
Büscher, M.
Stein, H. -J
Ströher, H.
Täschner, A.
Valdau, Yu
Wilkin, C.
Wronska, A.
Chiladze, D.
Dymov, S.
Hartmann, M.
Hejny, V.
Kacharava, A.
Keshelashvili, I.
Kulessa, P.
Source :: Physical review letters 98, 242301 (2007). doi:10.1103/PhysRevLett.98.242301, BASE-Bielefeld Academic Search Engine
Publication Year :: 2007
Abstract: The differential and total cross sections for the d+p->3He+eta reaction have been measured in a high precision high statistics COSY-ANKE experiment near threshold using a continuous beam energy ramp up to an excess energy Q of 11.3 MeV with essentially 100% acceptance. The kinematics allowed the mean value of Q to be determined to about 9 keV. Evidence is found for the effects of higher partial waves for Q>4 MeV. The very rapid rise of the total cross section to its maximum value within 0.5 MeV of threshold implies a very large eta-3He scattering length and hence the presence of a quasi-bound state extremely close to threshold.<br />Comment: 4 pages, 4 figures, 1 table, submitted to Phys. Rev. Lett

Subjects :: hadroproduction [eta]
experimental results [magnetic spectrometer]
missing-mass [mass spectrum]
partial wave
deuteron p --> helium-3 eta
Juelich COSY PS
energy dependence [channel cross section]
exclusive reaction [p deuteron]
angular dependence
ddc:550
threshold
momentum dependence [asymmetry]
scattering length [eta nucleus]
Nuclear Experiment
nuclide [helium]

Language :: English
Database :: OpenAIRE
Journal :: Physical review letters 98, 242301 (2007). doi:10.1103/PhysRevLett.98.242301, BASE-Bielefeld Academic Search Engine
Accession number :: edsair.pmid.dedup....1388e0ae962314094510d200ee939aac
Full Text :: https://doi.org/10.1103/PhysRevLett.98.242301