Light nucleus production in $$\bar p^4 $$ He annihilation between 0 and 600 MeV/cHe annihilation between 0 and 600 MeV/c

Balestra, F.; Bossolasco, S.; Bussa, M. P.; Busso, L.; Fava, L.; Ferrero, L.; Panzieri, D.; Piragino, G.; Tosello, F.; Barbieri, Riccardo; Bendiscioli, G.; Rotondi, R.; Salvini, P.; Zenoni, A.; Batusov, Yu.A.; Falomkin, I.V.; Nichitiu, F.; Pontecorvo, G. B.; Sapozhnikov, M. G.; Tretyak, V.I.; Guaraldo, C.; Maggiora, A.; Rizzini, E. Lodi; Haatuft, A.; Halsteinslid, A.; Myklebost, K.; Olsen, J.; Breivik, F.O.; Jacobsen, T.; Sørensen, S.O.

doi:10.1007/bf02812962

Cited by 32 publications

(17 citation statements)

References 15 publications

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“…Relaxing this assumption will allow the possibility of the total annihilation of small patches of antimatter inside larger regions of matter. This might lead to a net production of D by nucleodisruption, which has a higher D/ 3 He production ratio (Balestra et al 1988), hence alleviate the constraints made by the overproduction of 3 He nuclei. The Dirac-Milne universe does not undergo an accelerated expansion and therefore seems to conflict with the usual interpretation of type Ia distance measurements.…”

Section: Resultsmentioning

confidence: 99%

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Introducing the Dirac-Milne universe

Benoit-Lévy

Chardin

2012

A&A

103

105

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The ΛCDM standard model, although an excellent parametrization of the present cosmological data, contains two as yet unobserved components, dark matter and dark energy, that constitute more than 95% of the Universe. Faced with this unsatisfactory situation, we study an unconventional cosmology, the Dirac-Milne universe, a matter-antimatter symmetric cosmology, in which antimatter is supposed to present a negative active gravitational mass. The main feature of this cosmology is the linear evolution of the scale factor with time, which directly solves the age and horizon problems of a matter-dominated universe. We study the concordance of this model to the cosmological test of type Ia supernovae distance measurements and calculate the theoretical primordial abundances of light elements for this cosmology. We also show that the acoustic scale of the cosmic microwave background naturally emerges at the degree scale despite an open geometry.

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Section: Resultsmentioning

confidence: 99%

“…Nuclei produced by nucleodisruption possess a kinetic energy ranging from a few MeV for nuclei to a few tens of MeV for nucleons (Balestra et al 1988). These newly produced nuclei thermalize by Coulomb scattering on ambient protons and electrons.…”

Section: Production By Nucleodisruptionmentioning

confidence: 99%

Introducing the Dirac-Milne universe

Benoit-Lévy

Chardin

2012

A&A

103

105

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“…[25]. Production of secondary nuclei during antinucleon annihilations on the other light nuclei, and anti-4 He annihilation on 4 He, are relatively unimportant for this study.…”

Section: A Annihilation Reactions and Cross Sectionsmentioning

confidence: 99%

“…Using a value of 35 mb for the fusion cross section, the threshold energies of E th = 4.80 MeV and E th = 4.03 MeV, respectively, and the energy distribution for the nonthermal mass three nuclei as given in [25], we find…”

Section: Impact Of Secondaries In Antinucleon-nucleusmentioning

confidence: 99%

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Limits on cosmic matter-antimatter domains from big bang nucleosynthesis

Rehm

Jedamzik

2001

Phys. Rev. D

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We present detailed numerical calculations of the light element abundances synthesized in a Universe consisting of matter-and antimatter-domains, as predicted to arise in some electroweak baryogenesis scenarios. In our simulations all relevant physical effects, such as baryon-antibaryon annihilations, production of secondary particles during annihilations, baryon diffusion, and hydrodynamic processes are coupled to the nuclear reaction network. We identify two dominant effects, according to the typical spatial dimensions of the domains. Small antimatter domains are dissipated via neutron diffusion prior to 4 He synthesis at T4 He ≈ 80 keV, leading to a suppression of the primordial 4 He mass fraction. Larger domains are dissipated below T4 He via a combination of proton diffusion and hydrodynamic expansion. In this case the strongest effects on the elemental abundances are due top 4 He annihilations, leading to an overproduction of 3 He relative to 2 H and to overproduction of 6 Li via non-thermal nuclear reactions. Both effects may result in light element abundances deviating substantially from the standard Big Bang Nucleosynthesis yields and from the observationally inferred values. This allows us to derive stringent constraints on the antimatter parameters. For some combinations of the parameters, one may obtain both, low 2 H and low 4 He, at a common value of the cosmic baryon density, a result seemingly favored by current observational data. 26.35.+c,98.80Cq,25.43.+t

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Antinucleon-nucleon and antinucleon-nucleus interaction. A review of experimental data

Bendiscioli

Kharzeev

1994

Riv. Nuovo Cim.

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Light nucleus production in $$\bar p^4 $$ He annihilation between 0 and 600 MeV/cHe annihilation between 0 and 600 MeV/c

Cited by 32 publications

References 15 publications

Introducing the Dirac-Milne universe

Introducing the Dirac-Milne universe

Limits on cosmic matter-antimatter domains from big bang nucleosynthesis

Antinucleon-nucleon and antinucleon-nucleus interaction. A review of experimental data

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