Interaction of stopped antiprotons with copper

Jastrzȩbski, J.; Iljinov, A. S.; Riepe, G.; Kim, Y.S.; Botvina, A. S.; Grabowska, Anna; Daniel, H.; Hartmann, F. J.; Plendl, H. S.; Golubeva, Ye. S.; Kurcewicz, W.; Hofmann, Peter; Egidy, T. von; Lubiński, P.; Stolarz, A.

doi:10.1103/physrevc.47.216

Cited by 14 publications

(14 citation statements)

References 42 publications

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“…After such events cold residual nuclei are formed with a mass equal to the target mass decreased by the mass of one nucleon which participated in the annihilation process. Experimentally, such products with mass (A t -1) were clearly observed with a large yield in the radiochemical studies of the stopped antiproton interaction with nuclei [36,38].…”

Section: The Methodsmentioning

confidence: 97%

“…Such studies were undertaken more than ten years ago [35][36][37] and were continued thereafter [38][39][40]. Their main objective, similar to that for radiochemical work conducted for decades with protons, heavy ions or pions (see e.g.…”

Section: The Methodsmentioning

confidence: 99%

“…These distributions were gathered from the yield of the radioactive reaction products, as previously described [38,39]. It was assumed that for non-fissile targets one antiproton stopped in the target material produces one heavy reaction residue.…”

Section: Experimental Techniquementioning

confidence: 99%

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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: 97%

Section: The Methodsmentioning

confidence: 99%

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Composition of the nuclear periphery from antiproton absorption

et al. 1998

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“…A more localized energy is deposited in a nucleus in antiproton induced reactions. For example, the average excitation energy after the stopped antiproton annihilation in Cu target is similar to the average excitation energy irradiated by 2-GeV proton [6].…”

Section: Introductionmentioning

confidence: 79%

Nuclear fragmentation induced by low-energy antiprotons within a microscopic transport approach

Feng

2016

Phys. Rev. C

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Within the framework of the Lanzhou quantum molecular dynamics (LQMD) transport model, the nuclear fragmentation induced by low-energy antiprotons has been investigated thoroughly. A coalescence approach is developed for constructing the primary fragments in phase space. The secondary decay process of the fragments is described by the well-known statistical code. It is found that the localized energy released in antibaryon-baryon annihilation is deposited in a nucleus mainly via pion-nucleon collisions, which leads to the emissions of pre-equilibrium particles, fission, evaporation of nucleons and light fragments etc. The strangeness exchange reactions dominate the hyperon production. The averaged mass loss increases with the mass number of target nucleus. A bump structure in the domain of intermediate mass for heavy targets appears owing to the contribution of fission fragments. PACS number(s): 25.43.+t, 24.10.Lx, 25.70.Pq

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“…A number of interesting phenomena were observed, e.g., the delayed fission from the decay of hypernuclei in antiproton annihilations on heavy nuclei [13], unexpected enhancement of the Λ/K 0 S ratio [14], decay mode of highly excited nucleus etc [15,16]. The low-energy antiprotons usually annihilate at the nucleus surface because of the large absorption cross section.…”

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confidence: 99%

Unexpected neutron/proton ratio and isospin effect in low-energy antiproton-induced reactions

Zhu

2017

Phys. Rev. C

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The inclusive spectra of preequilibrium nucleons produced in low-energy antiproton-nucleus collisions are thoroughly investigated within the framework of the Lanzhou quantum molecular dynamics model for the first time. All possible reaction channels such as elastic scattering, annihilation, charge exchange and inelastic scattering in antibaryon-baryon, baryon-baryon and meson-baryon collisions have been included in the transport model. The unexpected neutron/proton ratio in comparison to the pion and proton induced reactions is caused from the isospin effects of pion-nucleon collisions and the density dependence of symmetry energy. It is found that the π − -neutron collisions enhance the neutron emission in the antiproton annihilation in a nucleus. Different to heavy-ion collisions, the isospin effects are pronounced at the low kinetic energies. A soft symmetry energy with the stiffness of γs =0.5 at subsaturation densities is constrained from the available data of the neutron/proton spectra. On the other hand, the antiproton-nucleus collisions are motivated to many interesting issues, i.e., charmonium physics, strangeness physics, antiprotonic atom, symmetry, in-medium properties of hadrons, cold quark-gluon plasma, highly excited nucleus etc [7,8]. Recently, the antiproton-antiproton interaction was investigated by the STAR collaboration in relativistic heavy-ion collisions [9].In the past decades, the nuclear reactions induced by antiprotons were investigated with the facilities of the low-energy antiproton ring (LEAR) at CERN [10], the National Laboratory for High Energy Physics at KEK [11] and Brookhaven National Laboratory Alternating Gradient Synchrotron (AGS) accelerator [12]. A number of interesting phenomena were observed, e.g., the delayed fission from the decay of hypernuclei in antiproton annihilations on heavy nuclei [13], unexpected enhancement of the Λ/K 0 S ratio [14], decay mode of highly excited nucleus etc [15,16]. The low-energy antiprotons usually annihilate at the nucleus surface because of the large absorption cross section. The huge annihilation energy are available for producing the 2-6 pions [17,18]. The subsequent processes are complicated and also associated with the multiple pion-nucleon interaction, which result in the fragmentation of target nucleus and the preequilibrium emissions of complex particles [19,20].The dynamics of the antiproton-nucleus collisions is more complicated in comparison to hadron (proton, π, K etc) induced reactions and to heavy-ion collisions, in which the particles produced in the annihilation of the antiproton in a nucleus are coupled to the subsequent collisions with surrounding nucleons. The dynamics of antiproton-nucleus collisions is complicated, which is associated with the mean-field potentials of hadrons in nuclear medium, and also coupled to a number of reaction channels, i.e., the annihilation channels, charge-exchange reaction, elastic and inelastic collisions. There has been several approaches for describing the nuclear dynamics induced by anti...

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Interaction of stopped antiprotons with copper

Cited by 14 publications

References 42 publications

Composition of the nuclear periphery from antiproton absorption

Composition of the nuclear periphery from antiproton absorption

Nuclear fragmentation induced by low-energy antiprotons within a microscopic transport approach

Unexpected neutron/proton ratio and isospin effect in low-energy antiproton-induced reactions

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