Energy levels of light nuclei A = 12

Heavy ion charge exchange reactions as probes for nuclear β-decay

The production of $ \Delta^{{++}}_{}$ and $ \Delta^{0}_{}$ resonances on oxygen nuclei in 16O + p interactions at 3.25A GeV/c was investigated with 4$ \pi$ acceptance. The masses and widths of the resonances were obtained from an analysis of the experimental and background invariant-mass distributions of p$ \pi^{{\pm}}_{}$ pairs. The fractions of charged pions coming from $ \Delta^{{++}}_{}$ and $ \Delta^{0}_{}$ decay were estimated. The momentum, kinetic energy, and emission angle distributions of $ \Delta^{{++}}_{}$ and $ \Delta^{0}_{}$ resonances were reconstructed in the oxygen nucleus rest frame. The slope parameters, T0 , of the reconstructed spectra of invariant cross-sections of $ \Delta^{{++}}_{}$ and $ \Delta^{0}_{}$ resonances, produced on oxygen nuclei in 16O + p interactions at 3.25A GeV/c , were determined.

Production of $ \Delta$(1232) -resonances on oxygen nuclei in 16O + p collisions at a momentum of 3.25 GeV/c per nucleon

Evidence for resonance matter at SIS

Elastic charge-exchange in relativistic heavy ion collisions is responsible for the non-disruptive change of the charge state of the nuclei. We show that it can be reliably calculated within the eikonal approximation for the reaction part. The formalism is applied to the charge-pickup cross sections of 158 GeV/nucleon Pb projectiles on several targets. The relative contributions of pion- and rho-exchange are determined, using a single-particle model for the internal structure of the nuclei. The calculated cross sections are non-negligible for heavy targets. It is shown that these cross sections can be useful to obtain information on the Gamow-Teller transition strengths of the nuclei.

Charge exchange in relativistic heavy ion collisions

We report here the results of the calibration of the polarimeter POMME for vector polarized deuterons at an energy of 1.8 GeV. The results show that inclusive deuteron-carbon scattering has substantial vector analyzing power even at this high energy. The results obtained on two analyzers, carbon, which is generally used and a lighter material, paraffin, are found to be similar.

/pdf/calibration-of-the-polarimeter-pomme-with-polarized-1wexk6jc47.pdf

Calibration of the polarimeter POMME with polarized deuterons at 1.8 GeV

The inclusive 2(3He,t) reaction has been studied at 2 GeV for energy transfers up to 500 MeV and scattering angles from 0.250 up to 40. Data are well reproduced by a model based on a coupled-channel approach for describing the NN and NΔ systems. The effect of final state interaction is important in the low energy part of the spectra. In the delta region, the cross-section is very sensitive to the effects of Δ-N interaction and ΔN → NN process. The latter has also a large influence well below the pion threshold. The calculation underestimates the experimental cross-section between the quasi-elastic and the delta peaks; this is possibly due to projectile excitation or purely mesonic exchange currents.

Inclusive H-2(He-3,t) Reaction at 2 GeV

Study of Decay and Absorption of ∆ Resonance in Nuclei with a 4π Detector

Coherent pions in charge-exchange reactions

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Papers

Calibration of the polarimeter POMME with polarized deuterons at 1.8 GeV

Inclusive H-2(He-3,t) Reaction at 2 GeV

Study of Decay and Absorption of ∆ Resonance in Nuclei with a 4π Detector

Coherent pions in charge-exchange reactions