On the energy levels in antiprotonic deuterium

Wycech, S.; Green, A.M.; Niskanen, J.A.

doi:10.1016/0370-2693(85)90501-5

Cited by 66 publications

(39 citation statements)

References 6 publications

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“…After the a e-mail: lodi@bs.infn.it subtraction of the Coulomb contribution, the neon result has the same size as that of p, while the 3 He result is twice as large as the others (including 4 He) at the same energy. When all of these cross-sections measurements together with the widths and the shifts of antiprotonic atoms [18][19][20] are considered inside several model analyses [13][14][15][21][22][23][24][25][26][27], a clear result emerges: thep-nucleus interaction is largely dominated by important saturation effects, both in the negative energy bound state domain and in the positive energy reaction sector.…”

Section: Introductionmentioning

confidence: 99%

First experimental detection of antiproton in-flight annihilation on nuclei at ∼ 130 keV

et al. 2012

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Abstract. The existing data of antinucleon-nucleon and antinucleon-nuclei annihilation cross-sections are confined to energies above about 1 MeV. Experimental limitations have prevented till now the lower energies data to be achieved in spite of the interest they represent for theoretical models. One of the unresolved question concerns the antiproton annihilation cross-section measured at LEAR on light nuclei in the MeV region, which show a saturation with the mass number of the target nucleus against any naive expectation. With regard to fundamental cosmology, the knowledge of the annihilation cross-sections at energies below 1 MeV can contribute to understand the matter-antimatter asymmetry in the Universe. We present here the experimental demonstration of the feasibility of the measurement of antiproton-nuclei annihilation cross-sections in the 100 keV region.

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Section: Introductionmentioning

confidence: 99%

First experimental detection of antiproton in-flight annihilation on nuclei at ∼ 130 keV

et al. 2012

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“…The width of the 1S state of thepD atom appears to be approximately equal to that for protonium. In the region of low antiproton momentum, the annihilation cross-sections in thepp,pD andp 4 He systems are approximately equal.…”

Section: Introductionmentioning

confidence: 97%

Antiproton-deuteron annihilation at low energies

2000

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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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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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On the energy levels in antiprotonic deuterium

Cited by 66 publications

References 6 publications

First experimental detection of antiproton in-flight annihilation on nuclei at ∼ 130 keV

First experimental detection of antiproton in-flight annihilation on nuclei at ∼ 130 keV

Antiproton-deuteron annihilation at low energies

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

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