Signature of a neutron halo in 232Th from antiproton absorption

Jastrzȩbski, J.; Daniel, H.; Egidy, T. von; Grabowska, Anna; Kim, Y.S.; Kurcewicz, W.; Lubiński, P.; Riepe, G.; Schmid, W.; Stolarz, A.; Wycech, S.

doi:10.1016/0375-9474(93)90409-q

Cited by 39 publications

(33 citation statements)

References 19 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: 77%

“…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: 77%

Section: Introductionmentioning

confidence: 99%

Neutron density distributions from antiprotonicPb208andBi209

Kłos¹,

et al. 2007

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“…Ending this section about the experimental method one should mention the article by Bloom et al [56], known to us well after the first presentation [12,13] of the method described here. In this article the idea of looking on nuclear (rather than mesonic) signals when investigating the composition of the nuclear periphery with exotic atoms was already suggested.…”

Section: The Methodsmentioning

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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“…10. As previously discussed [3], the radiochemical experiment [24] can be considered as giving the same ratio at a radial distance around 2.5 fm larger than the charge density radius. The radiochemical experiment was performed [18] for the isotopes 128 Te and 130 Te and its results are also shown in Fig.…”

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confidence: 90%

Strong interaction andE2effect in even-Aantiprotonic Te atoms

Kłos¹,

Wycech

Trzcińska

et al. 2004

Phys. Rev. C

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The x-ray cascade from antiprotonic atoms was studied for 122 Te, 124 Te, 126 Te, 128 Te, and 130 Te. Widths and shifts due to the strong interaction were deduced for several levels. The E2 nuclear resonance effect was observed in all investigated nuclei. In 130Te the E2 resonance allowed to determine level widths and shifts of the LS-split deeply bound ͑n , l͒ = ͑6,5͒ state, otherwise unobservable. The measured level widths and shifts, corrected for the E2-resonance effect, were used to investigate the nucleon density in the nuclear periphery. The deduced neutron distributions are compared with results of the previously introduced radiochemical method and with Hartree-Fock-Bogoliubov model calculations.

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Signature of a neutron halo in 232Th from antiproton absorption

Cited by 39 publications

References 19 publications

Neutron density distributions from antiprotonicPb208andBi209

Neutron density distributions from antiprotonicPb208andBi209

Composition of the nuclear periphery from antiproton absorption

Strong interaction andE2effect in even-Aantiprotonic Te atoms

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