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Abashian-Booth-Crowe effect in basic double-pionic fusion: a new resonance?
Phys Rev Lett
June 2011
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
We report on an exclusive and kinematically complete high-statistics measurement of the basic double-pionic fusion reaction pn→dπ(0)π(0) over the full energy region of the ABC effect, a pronounced low-mass enhancement in the ππ-invariant mass spectrum. The measurements, which cover also the transition region to the conventional t-channel ΔΔ process, were performed with the upgraded WASA detector setup at COSY. The data reveal the Abashian-Booth-Crowe effect to be uniquely correlated with a Lorentzian energy dependence in the integral cross section.
View Article and Find Full Text PDFDouble-pionic fusion of nuclear systems and the "ABC" effect: approaching a puzzle by exclusive and kinematically complete measurements.
Phys Rev Lett
February 2009
Physikalisches Institut der Universität Tübingen, D-72076 Tübingen, Germany.
The ABC effect-a puzzling low-mass enhancement in the pipi invariant mass spectrum, first observed by Abashian, Booth, and Crowe-is well known from inclusive measurements of two-pion production in nuclear fusion reactions. Here we report on the first exclusive and kinematically complete measurements of the most basic double-pionic fusion reaction pn-->dpi;{0}pi;{0} at beam energies of 1.03 and 1.
View Article and Find Full Text PDFHow low-energy weak reactions can constrain three-nucleon forces and the neutron-neutron scattering length.
Phys Rev Lett
June 2006
Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA.
We show that chiral symmetry and gauge invariance enforce relations between the short-distance physics that occurs in a number of electroweak and pionic reactions on light nuclei. Within chiral perturbation theory, this is manifested via the appearance of the same axial isovector two-body contact term in pi(-)d --> nngamma, p-wave pion production in NN collisions, tritium beta decay, pp fusion, nud scattering, and the hep reaction. Using a Gamow-Teller matrix element obtained from calculations of pp fusion as input, we compute the neutron spectrum obtained in pi(-)d --> nngamma.
View Article and Find Full Text PDFPionic fusion near threshold using the 208Pb(3He, pi -)211At reaction.
Phys Rev C Nucl Phys
December 1987
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