On the nucleon-antinucleon interactions

Gourdin, M.; Jancovici, B.; Verlet, Loup

doi:10.1007/bf02828757

Cited by 19 publications

(5 citation statements)

References 7 publications

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“…, who concluded that one needs a strong absorption even in the partial waves with angular momentum > 0. This was confirmed in explicit fits with optical potentials [27,28].…”

Section: Optical Modelssupporting

confidence: 59%

Nucleon-antinucleon interaction

Richard¹

2022

Preprint

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“…, who concluded that one needs a strong absorption even in the partial waves with angular momentum > 0. This was confirmed in explicit fits with optical potentials [27,28].…”

Section: Optical Modelssupporting

confidence: 59%

Nucleon-antinucleon interaction

Richard¹

2022

Preprint

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“…For the use in studies of the protonium and antinucleon-nucleus systems, it is convenient to summarize the information about the "elementary"N N interaction in the form of an effectiveN N potential. Early attempts were made by Gourdin et al [78], Bryan and Phillips [79] among others, and more recently by Kohno and Weise [80], and the Bonn-Jülich group [81][82][83]. Dover, Richard and Sainio [63,84,85] used as long range potential V LR the G-parity transformed of the Paris N N potential, regularized in a squarewell manner, i.e., V LR (r < r 0 ) = V LR (r 0 ) with r 0 = 0.8 fm, supplemented by a complex core to account for unknown short-range forces and for annihilation,…”

Section: Potential Modelsmentioning

confidence: 99%

“…Not surprisingly, it was impossible to follow this prescription when building optical models to fit the observed cross-sections. Among the contributions, one may cite [63,[78][79][80]. Claims such as [145], that it is possible to fit the cross sections with a short-range annihilation operator, are somewhat flawed by the use of very large strengths, wide form factors, and a momentum dependence of the optical potential that reinforce annihilation in L > 0 partial waves.…”

Section: Global Picture Of Annihilationmentioning

confidence: 99%

Antiproton Physics

Richard

2020

Front. Phys.

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We review the physics of low-energy antiprotons, and its link with the nuclear forces. This includes: antinucleon scattering on nucleons and nuclei, antiprotonic atoms and antinucleon-nucleon annihilation into mesons. Modern perspectives 39 Outlook 39 1 A brief historyIn 1932, the positron, the antiparticle of the electron, was discovered in cosmic rays and confirmed in the β + decay of some radioactive nuclei. See, e.g., the Nobel lecture by Anderson [1]. It was then reasonably anticipated that the proton also has an antiparticle, where A denotes the target nucleus. For A = p, this is a standard exercise in relativistic kinematics to demonstrate that the kinetic energy of the incoming proton should be higher than 6 m, where m is the proton mass, and c = 1. This threshold decreases if the target is more massive. The Bevatron was completed in 1954, and the antiproton was discovered in 1955 by a team lead by Chamberlain and Segrè, who were awarded the Nobel prize in 1959. 2 Shortly after the antiproton, the antineutron,n, was also discovered at Berkeley, and up to now, for any new elementary particle, the corresponding antiparticle has also been found. The discovery of the first anti-atom was well advertised [2], but this was not the case for the earlier observation of the first antinucleus, antideuterium, because of a controversy between an European team [3] and its US competitors [4]. In experiments at very high energy, in particular collisions of heavy ions at STAR (Brookhaven) and ALICE (CERN), one routinely produces light antinuclei and even anti-hypernuclei (in which an antinucleon is replaced by an antihyperonΛ) [5][6][7].The matter-antimatter symmetry is almost perfect, except for a slight violation in the sector of weak interactions, which is nearly exactly compensated by a simultaneous violation of the left-right symmetry, i.e., the product P C of parity P and charge-conjugation C is only very marginally violated. Up to now, there is no indication of any violation of the product CP T , where T is the time-reversal operator: this implies that the proton and antiproton have the same mass, a property now checked to less than 10 −9 [8].Many experiments have been carried out with low energy antiprotons, in particular at Brookhaven and CERN in the 60s and 70s, with interesting results, in particular for the physics of the mesons produced by annihilation. However, in these early experiments, the antiprotons were part of secondary beams containing many negativelycharged pions and kaons, and with a wide momentum spread.In the 70s, Simon van der Meer, and his colleagues at CERN and elsewhere imagined and developed the method of stochastic cooling [9], which produces antiproton beams of high purity, sharp momentum resolution, and much higher intensity than in the previous devices. CERN transformed the fixed-target accelerator SpS into a protonantiproton collider, SppS, with the striking achievement of the discovery of the W ± and Z 0 , the intermediate bosons of the electro-weak interaction. A similar scheme was lat...

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“…The translation of NN forces toward the NN system has been performed by several authors, including Fermi and Yang [207], and Ball and Chew [208], the latter been motivated by the rst measurements of antiproton cross-sections. The potentials by Gourdin et al [209], Bryan and Philips [210], Dover and Richard [211], Kohno and Weise [212], just to mention a few examples, will be discussed shortly.…”

Section: Long-range Nucleon-antinucleon Potentialmentioning

confidence: 99%

“…Early attempts to describe NN annihilation by an optical model were proposed by Ball et al [208], Gourdin et al [209], etc. A rather celebrated model, remaining a reference for later studies, is the potential developed by Bryan and Phillips [210].…”

Section: The Range Of Annihilation and Early Optical Modelsmentioning

confidence: 99%

Antinucleon–nucleon interaction at low energy: scattering and protonium

et al. 2002

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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On the nucleon-antinucleon interactions

Cited by 19 publications

References 7 publications

Nucleon-antinucleon interaction

Nucleon-antinucleon interaction

Antiproton Physics

Antinucleon–nucleon interaction at low energy: scattering and protonium

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