Residual nuclei after antiproton annihilation in Mo and Ho

Moser, E.; Daniel, H.; Egidy, T. von; Hartmann, F. J.; Kanert, W.; Schmidt, G. L.; Golubeva, Ye. S.; Iljinov, A. S.; Nicholas, M.; Reidy, J. J.

doi:10.1007/bf01290114

Cited by 9 publications

(41 citation statements)

References 13 publications

(17 reference statements)

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“…This is not in contradiction with the results of Ref. [36,37], where two (Z t + 1) products were observed. Their absolute yields were, however, not much larger than the upper limit values presented in Table V.…”

Section: Charge Exchange Reactionscontrasting

confidence: 56%

“…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%

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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: Charge Exchange Reactionscontrasting

confidence: 56%

Section: The Methodsmentioning

confidence: 97%

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Composition of the nuclear periphery from antiproton absorption

et al. 1998

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“…The experimental residual nuclide yields measured after stopped antiproton annihilation in targets ofnatCu, 92Mo, 9SMo, 98Mo, natBa and 16Silo [4][5][6] are compared with the yields calculated with the formula of Siimmerer et al and with the modified formula. The seven parameters of the modified formula and the three parameters for the six targets were obtained by a least squares fit to all experimental yields.…”

Section: Results Of the Fits And Comparison Of Antiproton And Relativmentioning

confidence: 99%

“…The annihilation produces between two and eight pions with energies of several hundred MeV and some of them start an intranuclear cascade with fast particle emis-* Dedicated to Prof. Dr. P. Kienle on the occasion of his 60th birthday sion, pre-equilibrium processes, multifragmentation and evaporation. The distributions of residual nuclei after these processes have been studied during the last years at LEAR/CERN, Geneva, by measuring the induced radioactivity with Ge detectors [3][4][5][6]. These residual nuclei distributions ofnatCu, 92Mo, 9SMo, 98M0, natBa and 16Silo targets are compared with the formula of Sfimmerer et al and fitted with a modified formula.…”

Section: Introductionmentioning

confidence: 99%