Low energy antiproton-nucleus interactions

Clover, M. R.; DeVries, R.M.; DiGiacomo, N.J.; Yariv, Y.

doi:10.1103/physrevc.26.2138

Cited by 63 publications

(34 citation statements)

References 22 publications

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“…Some of those pions may enter the nuclear volume initiating an intra-nuclear cascade [47][48][49] and heating the nucleus which subsequently emits neutrons, light charged particles, intermediate mass fragments or undergoes fission. The development of these processes evidently critically depends on the amount of transferred energy which in turn is related to the number, n int , of pions directed towards the inner nucleus and interacting inelastically with it.…”

Section: The Methodsmentioning

confidence: 99%

Composition of the nuclear periphery from antiproton absorption

et al. 1998

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Thirteen targets with mass numbers from 58 to 238 were irradiated with the antiproton beam from the Low Energy Antiproton Ring facility at CERN leading to the formation of antiprotonic atoms of these heavy elements. The antiproton capture at the end of atomic cascade results in the production of more or less excited residual nuclei. The targets were selected with the criterion that both reaction products with one nucleon less than the proton and neutron number of the target are radioactive. The yield of these radioactive products after stopped-antiproton annihilation was determined using gamma-ray spectroscopy techniques. This yield is related to the proton and neutron density in the target nucleus at radial distance corresponding to the antiproton annihilation site. The experimental data clearly indicate the existence of a neutron rich nuclear periphery, a "neutron halo", strongly correlated with the target neutron separation energy Bn, and observed for targets with Bn < 10 MeV. For two target nuclei, 106 Cd and 144 Sm, with larger neutron binding energies a proton rich nuclear periphery was observed. Most of the experimental data are in reasonable agreement with calculations based on current antiproton-nucleus and pion-nucleus interaction potentials and on nuclear densities deduced with the help of the Hartree-Fock-Bogoliubov approach. This approach was, however, unable to account for the 106 Cd and 144 Sm results.

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Section: The Methodsmentioning

confidence: 99%

Composition of the nuclear periphery from antiproton absorption

et al. 1998

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“…The interaction of antinucleons with nuclei is dominated by annihilation processes, finally producing a broad distribution of pions centered around a mean-value of 5 [2]. Here, we are interested in reactions at incident kinetic energies of a few MeV up to a few GeV.…”

Section: Initial State Interactionmentioning

confidence: 99%

Meson Production in Antinucleon Annihilation on Nuclei

Lourenço

Lenske

Wycech

2012

EPJ Web of Conferences

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Abstract. Pion production in coherent antiproton annihilation reactions on nuclei is studied in a fully quantum mechanical description. The elementary elastic NN and the NN → nπ annihilation vertices are obtained from a t-matrix accounting for coupled channels effects. The theoretical amplitudes are used to derive a microscopic NA optical model potential and the meson production vertices. Pion nucleus final state interaction are taken into account by adding higher pion-nucleon resonances beyond the ∆-resonance. Nuclear structure aspects are described by HFB-theory. Results for pA, πA and meson production cross sections are presented.

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“…From the annihilation zone several pions will be ejected [29][30][31]. At given energy their number depends on the target mass, varying between 5 pions in pC to 2 pions in pU [29] due to rescattering and absorption processes.…”

Section: Exclusive Pion Production By Annihilationmentioning

confidence: 99%

“…At given energy their number depends on the target mass, varying between 5 pions in pC to 2 pions in pU [29] due to rescattering and absorption processes. The pion production by annihilation takes place preferentially in the nuclear surface, hence the ejected pions carry important information on the spatial localization and the compositions of the medium in that area.…”

Section: Exclusive Pion Production By Annihilationmentioning

confidence: 99%

Antiprotons for nuclear structure research

Lenske

2009

Hyperfine Interact

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The interaction of antiprotons with nuclei is investigated in a model using the free space pN T-matrix and nuclear densities from HFB calculations. Elastic scattering and annihilation reactions are used as probes for nuclear sizes of exotic nuclei. The annihilation cross sections are related to the nuclear root-mean-square radii by a scaling law. By detecting a pion ejected from the annihilation zone in coincidence with the final A-1 system the the annihilation process can be localized spatially and used to to extract specific information on the nuclear wave function.

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Low energy antiproton-nucleus interactions

Cited by 63 publications

References 22 publications

Composition of the nuclear periphery from antiproton absorption

Composition of the nuclear periphery from antiproton absorption

Meson Production in Antinucleon Annihilation on Nuclei

Antiprotons for nuclear structure research

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