Antineutron–nucleus annihilation cross sections below 400 MeV/c

Astrua, Milena; Botta, E.; Bressani, T.; Calvo, D.; Casalegno, Cecilia; Feliciello, A.; Filippi, A.; Marcello, S.; Agnello, M.; Iazzi, F.

doi:10.1016/s0375-9474(01)01252-0

Cited by 40 publications

(75 citation statements)

References 29 publications

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“…[1]) as expected but these values are larger than those predicted by optical potential models which are able to reproduce well both the existing measurements at higher energies and the data of the antiprotonic atoms [2]. In addition then σ ann values on several nuclei (C, Al, Cu, Ag, Sn, Pb) measured at LEAR in the 70-400 MeV/c momentum range [1] present an anomalous behavior. Since the antineutron has no electric charge, a 1/p dependence ofn σ ann is expected (p is the momentum) but, in reality, the data are well fitted with a function containing a 1/p 2 term which is characteristic of charged projectiles (likep) as a consequence of the focussing effect of the trajectories due to the electrostatic attraction from the target nuclei.…”

Section: Introductionsupporting

confidence: 73%

“…In Fig.3 the present preliminary result with the existing experimental data forp andn σ ann on carbon [1,8] are shown together with the calculations from Ref. [2] Antinucleon σ ann at low energies on carbon.…”

Section: Resultsmentioning

confidence: 77%

“…[8] (p lab is the projectile momentum in the laboratory reference system). The yellow points are the experimental n data [1]. The continuous and dashed lines represent the calculations with the optical potential model from Ref.…”

Section: Resultsmentioning

confidence: 99%

“…In the 300-400 MeV/c projectile momentum region the antiproton (p) and antineutron (n) data have similar values (see for example Fig.11 in Ref. [1]) as expected but these values are larger than those predicted by optical potential models which are able to reproduce well both the existing measurements at higher energies and the data of the antiprotonic atoms [2]. In addition then σ ann values on several nuclei (C, Al, Cu, Ag, Sn, Pb) measured at LEAR in the 70-400 MeV/c momentum range [1] present an anomalous behavior.…”

Section: Introductionmentioning

confidence: 82%

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Recent Results on the Antiproton-Nucleus Annihilation Cross Section at Low Energy

Aghai-Khozani¹,

Corradini²,

Hayano³

et al. 2017

Proceedings of the 12th International Conference on Low Energy Antiproton Physics (LEAP2016)

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Measurements of the antinucleon-nuclei annihilation cross section (σ ann ) at very low energies have been performed at CERN during the 80's and 90's with the LEAR facility and more recently with the Antiproton Decelerator. One of the unexplained results is the behaviour of the antineutron data on several nuclei (C, Al, Cu, Ag, Sn, Pb) at momenta below 180 MeV/c [1], where the σ ann values, as a function of energy, have a steep rise typical of low-energy charged projectiles [2]. In order to put strong constraints on the relative strength of antineutron and antiproton interaction with nuclei, a comparison of σ ann for antiproton and antineutron projectiles with the same targets at the same energies is needed. To date this has been possible only for the hydrogen target (for momenta below 80 MeV/c) and for the tin target for which an antiproton measurement was performed at 100 MeV/c [3]. The ASACUSA Collaboration has recently performed the measurement of the σ ann of 5.3 MeV antiprotons on carbon. The preliminary result is here presented and the prospects are discussed.

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Section: Introductionsupporting

confidence: 73%

Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 82%

See 2 more Smart Citations

Recent Results on the Antiproton-Nucleus Annihilation Cross Section at Low Energy

Aghai-Khozani¹,

Corradini²,

Hayano³

et al. 2017

Proceedings of the 12th International Conference on Low Energy Antiproton Physics (LEAP2016)

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show abstract

“…Systematic measurements were performed at LEAR in the 80's and 90's with antiprotons (p) [1][2][3][4][5][6][7][8][9][10][11][12][13] and antineutrons (n) [14][15][16][17][18][19] at energies below 50 MeV and also with antiprotonic atoms (see [20]). Recently the ASACUSA Collaboration has measured the annihilation cross section (σ ann ) of antiprotons at the Antiproton Decelerator (AD) of CERN [21,22] at 5.3 MeV on medium and medium-heavy targets (Ni, Sn, Pt) [23].…”

Section: Introductionmentioning

confidence: 99%

Antiproton-nucleus annihilation cross section at low energy

et al. 2018

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Abstract. The antinucleon-nuclei annihilation cross sections at low energies were systematically measured at CERN in the 80's and 90's with the LEAR facility and later with the Antiproton Decelerator. Unfortunately only few data exist for very low energy antiprotons (p<500 MeV/c) on medium and heavy nuclei. A deeper knowledge is required by fundamental physics and can have consequence also in cosmology and medical physics. In order to fill the gap, the ASACUSA Collaboration has very recently measured the annihilation cross section of 100 MeV/c antiprotons on carbon. In the present work the experimental result is presented together with a comparison both with the antineutron data on the same target at the same energies and with the other existing antiproton data at higher energies.

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Composite Dark Matter and a horizontal symmetry

Carvunis

Guadagnoli

Reboud

et al. 2021

J. High Energ. Phys.

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We present a model of composite Dark Matter (DM), in which a new QCD-like confining “hypercolor” sector generates naturally stable hyperbaryons as DM candidates and at the same time provides mass to new weakly coupled gauge bosons H that serve as DM mediators, coupling the hyperbaryons to the Standard Model (SM) fermions. By an appropriate choice of the H gauge symmetry as a horizontal SU(2)h SM flavor symmetry, we show how the H gauge bosons can be identified with the horizontal gauge bosons recently put forward as an explanation for discrepancies in rare B-meson decays. We find that the mass scale of the H gauge bosons suggested by the DM phenomenology intriguingly agrees with the one needed to explain the rare B-decay discrepancies.

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Antineutron–nucleus annihilation cross sections below 400 MeV/c

Cited by 40 publications

References 29 publications

Recent Results on the Antiproton-Nucleus Annihilation Cross Section at Low Energy

Recent Results on the Antiproton-Nucleus Annihilation Cross Section at Low Energy

Antiproton-nucleus annihilation cross section at low energy

Composite Dark Matter and a horizontal symmetry

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