Neutron Halo in Heavy Nuclei from Antiproton Absorption

Lubiński, P.; Jastrzȩbski, J.; Grochulska, A.; Stolarz, A.; Trzcińska, A.; Kurcewicz, W.; Hartmann, F. J.; Schmid, W.; Egidy, T. von; Skalski, Janusz; Smolańczuk, R.; Wycech, S.; Hilscher, D.; Polster, D.; Rossner, H.

doi:10.1103/physrevlett.73.3199

Cited by 66 publications

(47 citation statements)

References 22 publications

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“…In turn, the crucial ingredient of this potential is the nucleon density at the radial distance where the antiproton-nucleus interaction occurs. Therefore, as it was shown already in our first publications in this series [1,2], the study of antiprotonic atoms may constitute a powerful tool for the extraction of information on the properties of the nuclear periphery.…”

Section: Discussionmentioning

confidence: 99%

“…To have at least some indication of its value, the 208 Pb halo factor was deduced by interpolation between f halo values for other nuclei, which are plotted either as a function of the neutron binding energy [2] (see Fig. 11) or of the asymmetry parameter δ = (N − Z)/Z [57].…”

Section: F Interpolated Halo Factormentioning

confidence: 99%

“…First, using the so-called radiochemical method, we investigated [1][2][3][4] the ratios of peripheral neutron to proton densities at distances around 2.5 fm larger than the nuclear charge half-density radius [5]. The method involved measuring the yield of radioactive nuclei having one proton or one neutron less than the target nucleus, produced after antiproton capture, cascade, and annihilation in the target antiprotonic atom.…”

Section: Introductionmentioning

confidence: 99%

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Neutron density distributions from antiprotonicPb208andBi209

Kłos¹,

et al. 2007

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The x-ray cascade from antiprotonic atoms was studied for 208 Pb and 209 Bi. Widths and shifts of the levels due to the strong interaction were determined. Using modern antiproton-nucleus optical potentials, the neutron densities in the nuclear periphery were deduced. Assuming two-parameter Fermi distributions (2pF) describing the proton and neutron densities, the neutron rms radii were deduced for both nuclei. The difference of neutron and proton rms radii r np equal to 0.16 ± (0.02) stat ± (0.04) syst fm for 208 Pb and 0.14 ± (0.04) stat ± (0.04) syst fm for 209 Bi were determined, and the assigned systematic errors are discussed. The r np values and the deduced shapes of the neutron distributions are compared with mean field model calculations.

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Section: Discussionmentioning

confidence: 99%

Section: F Interpolated Halo Factormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Neutron density distributions from antiprotonicPb208andBi209

Kłos¹,

et al. 2007

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“…We have recently reported [12,13] a new experimental study of the nuclear periphery using the formation of antiprotonic atoms. In this study the nuclear products of antiproton annihilation on a peripheral proton or neutron were identified using simple radiochemical methods.…”

Section: Introductionmentioning

confidence: 99%

“…There is a growing experimental evidence [1][2][3][4][5][6][7][8][9][10][11][12][13][14] that the outer periphery of many stable isotopes of heavy elements is composed predominantly of neutrons. Although this is in agreement with simple [15] as well as sophisticated [16] nuclear models, its recognition could only rarely be found in the literature [17,18].…”

Section: Introductionmentioning

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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Muonic, Mesonic, and Baryonic Atoms and Molecules: Addendum

Hartmann

2003

Digital Encyclopedia of Applied Physics

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Neutron Halo in Heavy Nuclei from Antiproton Absorption

Cited by 66 publications

References 22 publications

Neutron density distributions from antiprotonicPb208andBi209

Neutron density distributions from antiprotonicPb208andBi209

Composition of the nuclear periphery from antiproton absorption

Muonic, Mesonic, and Baryonic Atoms and Molecules: Addendum

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