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Abashian-Booth-Crowe effect in basic double-pionic fusion: a new resonance?

P Adlarson¹, C Adolph, W Augustyniak

¹Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.

Physical Review Letters

|July 21, 2011

Summary

This summary is machine-generated.

This study investigated the Abashian-Booth-Crowe (ABC) effect in a proton-neutron fusion reaction. The findings suggest the ABC effect is linked to a narrow resonance in the dipion system.

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Area of Science:

Nuclear Physics
Particle Physics

Background:

The Abashian-Booth-Crowe (ABC) effect is a low-mass enhancement observed in the dipion invariant mass spectrum.
Understanding the ABC effect is crucial for comprehending pion production mechanisms in nuclear reactions.

Purpose of the Study:

To conduct a high-statistics measurement of the proton-neutron to deuteron plus two neutral pions (pn→dπ(0)π(0)) reaction.
To investigate the energy dependence of the ABC effect and its connection to the t-channel ΔΔ process.

Main Methods:

Utilized the upgraded WASA detector setup at COSY for kinematically complete measurements.
Analyzed data covering the full energy range of the ABC effect and the transition to the ΔΔ process.

Main Results:

The ABC effect was found to be uniquely correlated with a Lorentzian energy dependence in the integral cross section.
Observables are consistent with a narrow resonance (m=2.37 GeV, Γ≈70 MeV, I(J(P))=0(3+)) in both proton-neutron and ΔΔ systems.

Conclusions:

The study provides strong evidence for a resonance interpretation of the Abashian-Booth-Crowe effect.
Further experimental tests are proposed to confirm the resonance properties and its role in pion production.