|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'503'724
Articles rated: 2609
23 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Experimental study of pp eta dynamics in the pp --> ppeta reaction | | P. Moskal
; H.-H. Adam
; A. Budzanowski
; R. Czyzykiewicz
; D. Grzonka
; M. Janusz
; L. Jarczyk
; B. Kamys
; A. Khoukaz
; K. Kilian
; P. Kowina
; K. Nakayama
; W. Oelert
; C. Piskor-Ignatowicz
; J. Przerwa
; T. Rozek
; R. Santo
; G. Schepers
; T. Sefzick
; M. Siemaszko
; J. Smyrski
; S. Steltenkamp
; A. Taschner
; P. Winter
; M. Wolke
; P. Wustner
; W. Zipper
; | | Date: |
4 Jul 2003 | | Journal: | Phys.Rev. C69 (2004) 025203 | | Subject: | nucl-ex | | Affiliation: | Julich Forschungszentrum & Jagellonian U. & Munster U. & Cracow, INP & Silesia U. & Georgia U. | | Abstract: | A high statistics measurement of the pp --> ppeta reaction at an excess energy of Q = 15.5 MeV has been performed at the internal beam facility COSY-11. The stochastically cooled proton beam and the used detection system allowed to determine the momenta of the outgoing protons with a precision of 4 MeV/c (sigma) in the center-of-mass frame. The determination of the four-momentum vectors of both outgoing protons allowed to derive the complete kinematical information of the ppeta-system. An unexpectedly large enhancement of the occupation density in the kinematical regions of low proton-eta relative momenta is observed. A description taking the proton-proton and the eta-proton interaction into account and assuming an on-shell incoherent pairwise interaction among the produced particles fails to explain this strong effect. Its understanding will require a rigorous three-body approach to the ppeta system and the precise determination of contributions from higher partial waves. We also present an invariant mass spectrum of the proton-proton system determined at Q = 4.5 MeV. Interestingly, the enhancement at large relative momenta between protons is visible also at such a small excess energy. In contrast to all other determined angular distributions, the orientation of the emission plane with respect to the beam direction is extracted to be anisotropic. | | Source: | arXiv, nucl-ex/0307005 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER