Comparison of residual nuclei from relativistic ion and antiproton reactions with nuclei

Egidy, T. von; Schmidt, Hartwig

doi:10.1007/bf01281276

Cited by 4 publications

(10 citation statements)

References 5 publications

(14 reference statements)

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“…A thick target of natural gold was irradiated with the antiproton beam of 200 MeV/c momentum from LEAR facility. The target of the total thickness of 549 mg/cm 2 was composed of ten foils of 80, 30,30,30,2,30,30,37, 80 and 200 mg/cm 2 , starting from the beam side. The initial energy of the antiprotons, equal to about 21 MeV, was reduced in the scintillation counter (from Pilot B) and in some additional moderators (mylar,silicon) to about 6.5 MeV at the target surface.…”

Section: Methodsmentioning

confidence: 99%

“…The method based on off-line γ-ray spectroscopy has some limitations. The most important is the necessity to use some phenomenological model to reconstruct the yields of unobservable products [12,20,21,36,37]. In similar experiments with other projectiles the data are sparsely spread over the N -Z plane.…”

Section: Methodsmentioning

confidence: 99%

“…To compare with our results we present δ stab obtained for the inverse kinematic Au + p reaction at 800 MeV [29,30] and for energetic protons [27,43]. Besides this, we have also plotted curves derived for the Au target from a general formulae describing the Z p (A) path for products of various medium and heavy target fragmentations induced with protons at the fragmentation limit [36] and with stopped antiprotons [37]. The lower part of Fig.…”

Section: Figmentioning

confidence: 95%

“…The width of the Z distribution, σ, was found to decrease smoothly with decreasing A when a generalized approach is used for protons [36] or antiprotons [37]. On the contrary, results of fitting within shorter mass regions are again inconsistent with compilations using broad mass regions, with quite small widths for evaporation residues and with a large scatter of σ for fission fragments [39,51,52].…”

Section: Figmentioning

confidence: 99%

“…Such a presentation was earlier applied to study the FIG. 7: Upper part: Distance of the fitted most probable Z from the beta stability line: protons/heavy ions compilation at saturation limit [36], antiprotons at rest energy compilation [37], Au at 800 MeV on H [29,30], protons at 11.5/300 GeV [43], protons at 3/6 GeV [27] and fission for protons at 1 GeV [27]. Lower part: Charge distribution widths as a function of residue mass.…”

Section: Charge Distributionmentioning

confidence: 99%

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Gold fragmentation induced by stopped antiprotons

et al. 2002

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A natural gold target was irradiated with the antiproton beam from the Low Energy Antiproton Ring at CERN. Antiprotons of 200 MeV/c momentum were stopped in a thick target, products of their annihilations on Au nuclei were detected using the off-line gamma-ray spectroscopy method. In total, yields for 114 residual nuclei were determined, providing a data set to deduce the complete mass and charge distribution of all products with A > 20 from a fitting procedure. The contribution of evaporation and fission decay modes to the total reaction cross section as well as the mean mass loss were estimated. The fission probability for Au absorbing antiprotons at rest was determined to be equal to (3.8+-0.5)%, in good agreement with an estimation derived using other techniques. The mass-charge yield distribution was compared with the results obtained for proton and pion induced gold fragmentation. On the average, the energy released in pbar annihilation is similar to that introduced by ~ 1 GeV protons. However, compared to proton bombardment products, the yield distribution of antiproton absorption residues in the N-Z plane is clearly distinct. The data for antiprotons exhibit also a substantial influence of odd-even and shell effects.Comment: 14 pages, 9 figures, Revtex 4, to be published in Physical Review

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Figmentioning

confidence: 95%

Section: Figmentioning

confidence: 99%

Section: Charge Distributionmentioning

confidence: 99%

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Gold fragmentation induced by stopped antiprotons

et al. 2002

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Neutrons produced by 1.22 GeV antiproton interactions with nuclei

Egidy

Фігуера²,

Galin

et al. 2000

Eur. Phys. J. A

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Antiproton-nucleus annihilation at rest

et al. 1993

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Cooled antiprotons from the LEAR storage ring facility have been stopped in targets from A = 6 to 238 to investigate the processes following annihilation at the nuclear surface. Among the recent results are the following:The measured spectracan be fitted to N(p2) = No exp ( -p 2 / p i ) , where p is the momentum of the ejectiles and po s 360 MeV/c for all ejected particles from protons to alpha particles and for all 16 targets except "Li. The proton spectra show an additional low-momentum component attributed to evaporation. The measured residual nucleus distribution from stopped p annihilation in Cu, when compared with INC calculations and with residual mass distributions from energetic n+, II-and proton interactions with Cu, indicate that the energy set free in the annihilation process is used only in part as excitation energy. The residual nucleus distribution from a 238U target shows that both symmetric and asymmetric fission take place. Detection and analysis of coincident fission products from ' "' Bi, Z32Th and 238U enabled us to determine the individual and total mass and energy distributions of the fragments, their opening angle, the average excitation energy and momentum of the nucleus at scission, and the number of nucleons emitted before and after scission. We also found that the process is asymmetric for low excitation energies and symmetric for higher ones. INC calculations have reproduced the experimental results.

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Comparison of residual nuclei from relativistic ion and antiproton reactions with nuclei

Cited by 4 publications

References 5 publications

Gold fragmentation induced by stopped antiprotons

Gold fragmentation induced by stopped antiprotons

Neutrons produced by 1.22 GeV antiproton interactions with nuclei

Antiproton-nucleus annihilation at rest

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