Measurement of the Strong Interaction Shift and Width of the Ground State of Pionic Hydrogen.

Authors :: Manil, B.
Anagnostopoulos, D. F.
Biri, S.
Borchert, G. L.
Breunlich, W.
Egger, J. P.
Gotta, D.
Gruber, A.
Hennebach, M.
Indelicato, P.
Jensen, T.
Liu, Y. W.
Markushin, V.
Nelms, N.
Simons, L. M.
Zmeskal, H.
Source :: Hyperfine Interactions; 2003, Vol. 146/147 Issue 1-4, p343-347, 5p
Publication Year :: 2003
Abstract: An experiment to measure the strong interaction width (Γ<subscript>1s</subscript>) and shift (ℇ<subscript>1s</subscript>) of the ground state of pionic hydrogen (π<superscript>-</superscript>p), in order to determine the isospin separated scattering lengths (a<superscript>+</superscript> and a<superscript>-</superscript>) with a relative accuracy of better than 10<superscript>-2</superscript>, has been undertaken at the Paul Scherrer Institute (PSI). This measurement is based on high-precision X-ray spectroscopy of the np→1s transitions pionic hydrogen (π<superscript>-</superscript>p). A preliminary analysis of the data taken in December 2000 is presented. [ABSTRACT FROM AUTHOR]

Subjects :: PION-pion interactions
NUCLEAR reactions
NUCLEAR physics
HYDROGEN
NONMETALS
CHEMICAL elements
SPECTRUM analysis
ANALYTICAL chemistry

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