Measurement of the strong interaction parameters in antiprotonic deuterium

Augsburger, Marc; Anagnostopoulos, D. F.; Borchert, G.; Chatellard, D.; Egger, J.‐P.; El‐Khoury, Patrick Z.; Gorke, H.; Gotta, D.; Hauser, Peter C.; Indelicato, P.; Kirch, K.; Lenz, S.; Rashid, Khalid; Siems, Th.; Simons, L. M.

doi:10.1016/s0370-2693(99)00840-0

Cited by 38 publications

(31 citation statements)

References 8 publications

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“…Relevant deviations from the previous predictions should be attributed to peculiarities of the external tail of the nuclear density (e.g. a longer tail in deuteron or 3 He, or a different proton/neutron composition at the surface). In the special case of neutron-halo nuclei the presence of a very long range tail in the nuclear matter distribution removes the basic assumptions of this work.…”

Section: Predictionsmentioning

confidence: 66%

“…At 30-50 MeV/c thepp total annihilation rate is larger than the corresponding rate forpD andp 4 He. The width and shift of the ground level of antiprotonic atom of Hydrogen are larger than the corresponding observables in antiprotonic Deuterium [3]. For thepp scattering length α ≡ α R + iα I we have [4,6,7] α R ≈ −α I ≈ 0.7÷0.8 fm, and the ρ-parameter (i.e.…”

Section: Introductionmentioning

confidence: 98%

“…Recently several experimental data [1][2][3][4][5][6] have shown that at projectile momenta below 200 MeV/c the behavior of antinucleon-nucleus annihilations is quite different from what could be naively expected.…”

Section: Introductionmentioning

confidence: 99%

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Limits on the low-energy antinucleon-nucleus annihilations from the Heisenberg principle

et al. 2001

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We show that the quantum uncertainty principle puts some limits on the effectiveness of the antinucleon-nucleus annihilation at very low energies. This is caused by the fact that the realization a very effective short-distance reaction process implies information on the relative distance of the reacting particles. Some quantitative predictions are possible on this ground, including the approximate A-independence ofN -nucleus annihilation rates.

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Section: Predictionsmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 98%

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Limits on the low-energy antinucleon-nucleus annihilations from the Heisenberg principle

et al. 2001

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“…In previous works we used the word "inversion". A related phenomenon was studied in antiprotonic atoms [3][4][5][6] and also pionic atoms [7].…”

Section: Introductionmentioning

confidence: 99%

“…In previous works we used the word "inversion". A related phenomenon was studied in antiprotonic atoms [3][4][5][6] and also pionic atoms [7].Since "shadowing" can be defined as the amount of departure from the Impulse Approximation, to quantify its real presence we need first to produce an impulse approximation estimation of the measured nuclear data. Not to overrate the shadowing effects, two more points must be taken into account: (1) a correct estimation of Coulomb enhancement effects, and (2) center of mass effects.…”

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confidence: 99%

Limits on the low-energy antinucleon annihilations from the Heisenberg principle

Bianconi¹

2001

Nuclear Physics A

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Here a short synthesis is presented of the work, developed in the last two years by the Brescia Collaboration, on the phenomenology of antinucleon-nucleon and antinucleon-nucleus annihilation at small momenta (below 300 MeV/c in the laboratory), with special stress on the role of general principles.Our work [1] in the last two years was mainly devoted to the study of the strong shadowing characterizingp annihilations onlight nuclei. The nuclear shadowing is evident in the fact that thepp total annihilation cross sections are larger than the correspondingpD andp 4 He ones forp momenta in the laboratory k < 70 MeV/c [2]. In previous works we used the word "inversion". A related phenomenon was studied in antiprotonic atoms [3][4][5][6] and also pionic atoms [7].Since "shadowing" can be defined as the amount of departure from the Impulse Approximation, to quantify its real presence we need first to produce an impulse approximation estimation of the measured nuclear data. Not to overrate the shadowing effects, two more points must be taken into account: (1) a correct estimation of Coulomb enhancement effects, and (2) center of mass effects. When data are represented with respect to the center of mass momentum[1], the shadowing effect is smaller, although apparently all the available nuclear annihilation cross sections become quite similar at k cm << 100 MeV/c. To fully understand the relevance of this similarity, we remind that at low energies Coulomb effects are expected to be quite strong and enhancē p 4 He annihilation rates about twice with respect topp ones. This traditional estimate of Coulomb effects [8] is based on the approximation of pointlike particles. Within an optical potential framework we re-calculated these Coulomb corrections, taking into account the finite size of thep and nuclear charge distributions. One of the results [1] was that the advantage of the Helium charge with respect to the Hydrogen case was not that large, in the laboratory frame.

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