p̄p annihilation cross section at very low energy

Bertin, A.; Bruschi, M.; Capponi, M.; Cereda, B.; Castro, S. De; Ferretti, Andrea; Galli, D.; Giacobbe, B.; Marconi, U.; Piccinini, M.; Cesari, Nicola Semprini; Spighi, R.; Vecchi, S.; Vezzani, A.; Villa, M.; Vitale, A.; Zoccoli, À.; Belli, G.; Corradini, M.; Donzella, A.; Rizzini, E. Lodi; Venturelli, L.; Zenoni, A.; Cicalò, C.; Masoni, A.; Puddu, G.; Serci, S.; Temnikov, P.; Usai, G. L.; Costa, S.; Ableev, V.G.; Денисов, О.; Gorchakov, O.E.; Prakhov, S.; Rozhdestvensky, A.M.; Sapozhnikov, M. G.; Tretyak, V.I.; Gianotti, P.; Guaraldo, C.; Lanaro, A.; Lucherini, V.; Nichitiu, F.; Petrascu, C.; Rosca, A.; Cavion, C.; Gastaldi, U.; Lombardi, M.; Vannucci, L.; Vedovato, G.; Andrighetto, A.; Morando, M.; Ricci, R. A.; Bendiscioli, G.; Filippini, V.; Fontana, A.; Montagna, P.; Rotondi, A.; Saino, A.; Salvini, P.; Filippi, A.; Balestra, F.; Botta, E.; Bressani, T.; Bussa, M. P.; Busso, L.; Calvo, D.; Cerello, P.; D'Isep, F.; Fava, L.; Feliciello, A.; Ferrero, L.; Garfagnini, R.; Grasso, A.; Maggiora, A.; Marcello, S.; Mirfakhraee, N.; Panzieri, D.; Parena, D.; Rossetto, E.; Tosello, F.; Agnello, M.; Iazzi, F.; Minetti, B.; Pauli, G.; Tessaro, S.; Santi, L.

doi:10.1016/0370-2693(95)01599-x

Cited by 69 publications

(45 citation statements)

References 26 publications

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“…[21] we evaluate the relative cross sections at low energy and compare those with the measured branching ratios. Specifically, we calculate the cross sections at p lab = 106 MeV/c (T lab ≈ 5 MeV) because at this energy the total annihilation cross section is known from experiment [22] and it can be used to calibrate the cross sections for the individual 5π and 6π channels based on the branching ratios.…”

Section: Then N → 5π 6π Reactionsmentioning

confidence: 99%

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Origin of the structures observed ine+e−annihilation into multipion states around thep¯pthreshold

et al. 2015

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We analyze the origin of the structures observed in the reactions e + e − → 3(π + π − ), 2(π + π − π 0 ), ωπ + π − π 0 , and e + e − → 2(π + π − )π 0 around the antiproton-proton (pp) threshold. We calculate the contribution of the two-step process e + e − →N N → multipions to the total reaction amplitude. The amplitude for e + e − →N N is constrained from near-threshold data on the e + e − →pp cross section and the one forN N → multipions can be likewise fixed from available experimental information, for all those 5π and 6π states. The resulting amplitude for e + e − → multipions turns out to be large enough to play a role for the considered e + e − annihilation channels and, in three of the four reactions, even allows us to reproduce the data quantitatively near theN N threshold. The structures seen in the experiments emerges then as a threshold effect due to the opening of theN N channel.

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Section: Then N → 5π 6π Reactionsmentioning

confidence: 99%

“…1. Note that the lowest "data" point is not from a measurement but deduced from the branching ratios [18] and the total annihilation cross section [22] as discussed in the preceding paragraph.…”

Section: Then N → 5π 6π Reactionsmentioning

confidence: 99%

Origin of the structures observed ine+e−annihilation into multipion states around thep¯pthreshold

et al. 2015

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“…In the MeV region there are also the data taken at LEAR but mostly with light targets [3][4][5][6][7][8][9][10][11]. These cross-sections deviate from the expected ZA 1/3 dependence [12] on the atomic charge Z and mass number A showing a saturation with A [13][14][15], whereas at higher energies thep nucleus annihilation cross-section increases regularly with the number of nucleons in the nuclei: in the energy interval MeV the measurements performed at LEAR in the 1980's [16] show that the annihilation cross-sections are proportional to A 2/3 .…”

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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“…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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p̄p annihilation cross section at very low energy

Cited by 69 publications

References 26 publications

Origin of the structures observed ine+e−annihilation into multipion states around thep¯pthreshold

Origin of the structures observed ine+e−annihilation into multipion states around thep¯pthreshold

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

Antiproton-nucleus annihilation cross section at low energy

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