Charged-particle spectra from antiproton annihilation at rest in = 12–238 nuclei

Hofmann, Peter; Hartmann, Florentine; Daniel, H. U.; VONEGIDY, T; Kanert, W.; Markiel, W.; Plendl, H.S.; MACHNER, H; RIEPE, G; PROTIC, D

doi:10.1016/0375-9474(90)93992-f

Cited by 2 publications

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“…This method uses the main ideas of the optical-cascade model which was earlier applied for the analysis of the annihilation of stopped antiprotons on nuclei [156]. Using the opticalcascade model the experimental data on stopped antiproton annihilation on nuclei obtained at LEAR [157,158] were successfully described.…”

Section: Modeling Of Annihilation Eventsmentioning

confidence: 99%

“…There is currently no experimental data on the annihilation of slow antineutrons, but the experimental data on stopped p-annihilation on light nuclei ( 12 C, 14 N) obtained at LEAR [157,158], including the multiplicity and charge distribution of pions, and momentum spectrum of pions and protons, was described successfully within the framework of the optical-cascade model [159]. Due to the surface character of a p-nucleus annihilation at rest, most of the annihilation pions escape from the nucleus.…”

Section: Modeling Of Annihilation Eventsmentioning

confidence: 99%

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Neutron-antineutron oscillations: Theoretical status and experimental prospects

et al. 2016

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The observation of neutrons turning into antineutrons would constitute a discovery of fundamental importance for particle physics and cosmology. Observing the n−n transition would show that baryon number (B) is violated by two units and that matter containing neutrons is unstable. It would provide a clue to how the matter in our universe might have evolved from the B = 0 early universe. If seen at rates observable in foreseeable next-generation experiments, it might well help us understand the observed baryon asymmetry of the universe. A demonstration of the violation of B − L by 2 units would have a profound impact on our understanding of phenomena beyond the Standard Model of particle physics.Slow neutrons have kinetic energies of a few meV. By exploiting new slow neutron sources and optics technology developed for materials research, an optimized search for oscillations using free neutrons from a slow neutron moderator could improve existing limits on the free oscillation probability by at least three orders of magnitude. Such an experiment would deliver a slow neutron beam through a magnetically-shielded vacuum chamber to a thin annihilation target surrounded by a low-background antineutron annihilation detector. Antineutron annihilation in a target downstream of a free neutron beam is such a spectacular experimental signature that an essentially background-free search is possible. An authentic positive signal can be extinguished by a very small change in the ambient magnetic field in such an experiment. It is also possible to improve the sensitivity of neutron oscillation searches in nuclei using large underground detectors built mainly to search for proton decay and detect neutrinos. This paper summarizes the relevant theoretical developments, outlines some ideas to improve experimental searches for free neutron oscillations, and suggests avenues both for theoretical investigation and for future improvement in the experimental sensitivity.

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Section: Modeling Of Annihilation Eventsmentioning

confidence: 99%

Section: Modeling Of Annihilation Eventsmentioning

confidence: 99%

Neutron-antineutron oscillations: Theoretical status and experimental prospects

et al. 2016

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“…The dotted histogram shows the contribution which evaporative protons impart to the whole distribution. The points show the experimental data taken in [53].…”

Section: Typementioning

confidence: 99%

Model of n¯ annihilation in experimental searches for n
Golubeva
¹
,
Barrow
²
,
Ladd
³

2019
Phys. Rev. D
27
0
67
0
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Searches for baryon number violation, including searches for proton decay and neutron-antineutron transformation ( → ̅), are expected to play an important role in the evolution of our understanding of beyond Standard Model physics. The → ̅ is a key prediction of certain popular theories of baryogenesis, and the experiments such as the Deep Underground Neutrino Experiment and the European Spallation Source plan to search for this process with bound-and free-neutron systems. Accurate simulation of this process in Monte Carlo will be important for the proper reconstruction and separation of these rare events from background. This article presents developments towards accurate simulation of the annihilation process for use in a cold, free neutron beam for → ̅ searches from ̅ annihilation, as 6 12 is the target of choice for the European Spallation Source's NNBar Collaboration. Initial efforts are also made in this paper to perform analogous studies for intra-nuclear transformation searches in 18 40 nuclei.I.

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Charged-particle spectra from antiproton annihilation at rest in = 12–238 nuclei

Cited by 2 publications

References 0 publications

Neutron-antineutron oscillations: Theoretical status and experimental prospects

Neutron-antineutron oscillations: Theoretical status and experimental prospects

Model of n¯ annihilation in experimental searches for n
Golubeva
¹
,
Barrow
²
,
Ladd
³

2019
Phys. Rev. D
27
0
67
0
View full text Add to dashboard Cite

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Charged-particle spectra from antiproton annihilation at rest in = 12–238 nuclei

Cited by 2 publications

References 0 publications

Neutron-antineutron oscillations: Theoretical status and experimental prospects

Neutron-antineutron oscillations: Theoretical status and experimental prospects

Model of n¯ annihilation in experimental searches for nGolubeva1, Barrow2, Ladd3 2019Phys. Rev. D270670View full textAdd to dashboardCite

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About

Model of n¯ annihilation in experimental searches for n
Golubeva
¹
,
Barrow
²
,
Ladd
³

2019
Phys. Rev. D
27
0
67
0
View full text Add to dashboard Cite