Measurement of the antiproton–nucleus annihilation cross-section at low energy

Aghai-Khozani, Hossein; Bianconi, A.; Corradini, M.; Hayano, R.; Hori, Masaki; Leali, M.; Rizzini, E. Lodi; Mascagna, V.; Murakami, Yo; Prest, M.; Vallazza, E.; Venturelli, L.; Yamada, Hiroyuki

doi:10.1016/j.nuclphysa.2018.01.001

Cited by 30 publications

(28 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, the ASACUSA's Collaboration took a new measurement of thepC annihilation cross section at a low energy of 5.3 MeV or p lab = 100 MeV/c [20]. Their cross section value of 1.73 ± 0.25 barns is also plotted in Fig.…”

Section: Cpa Annihilation Cross Sectionsmentioning

confidence: 99%

Optical model potential analysis of n¯A and nA interactions

Lee

Wong

2018

Phys. Rev. C

View full text Add to dashboard Cite

We use a momentum-dependent optical model potential to analyze the annihilation cross sections of the antineutronn on C, Al, Fe, Cu, Ag, Sn, and Pb nuclei for projectile momenta p lab 500 MeV/c. We obtain a good description of annihilation cross section data of Barbina et al. [Nucl. Phys. A 612, 346 (1997)] and of Astrua et al. [Nucl. Phys. A 697, 209 (2002)] which exhibit an interesting dependence of the cross sections on p lab as well as on the target mass number A.We also obtain the neutron (n) non-elastic reaction cross sections for the same targets. Comparing the nA reaction cross sections σ nA rec to thenA annihilation cross sections σn A ann , we find that σn A ann is significantly larger than the σ nA rec , that is, the σn A ann /σ nA rec cross section ratio lies between the values of about 1.5 to 4.0 in the momentum region where comparison is possible. The dependence of then annihilation cross section on the projectile charge is also examined in comparison with the antiprotonp. Here we predict thepA annihilation cross section on the simplest assumption that bothpA andnA interactions have the same nuclear part of the optical potential but differs only in the electrostatic Coulomb interaction. Deviation from a such simple model extrapolation in measurements will provide new information on the difference betweennA andpA potentials. PACS numbers: 24.10.-i, 25.43.+t, 25.75.-q, 2

show abstract

Section: Cpa Annihilation Cross Sectionsmentioning

confidence: 99%

Optical model potential analysis of n¯A and nA interactions

Lee

Wong

2018

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…Fig. 13 shows the layout of an experiment [3] employing Figure 13: Experimental layout to measure the cross section σ A tot of antiprotons with a kinetic energy E = 5.3 MeV annihilating in a carbon target (not to scale) [3]. A pulsed antiproton beam was allowed to traverse a target chamber that contained a thin carbon target.…”

Section: Nuclear Counter Effectsmentioning

confidence: 99%

“…The detec- Table 1: Specifications of the avalanche and p-i-n photodiodes used in this study: their active areas, effective thicknesses against ionizing radiation, terminal capacitances, cutoff frequencies of the output signals, and wavelength ranges over which the photodiodes retain sensitivity. tor was recently used in an experiment to determine the cross section σ A tot of 5.3 MeV antiprotons annihilating in a carbon target [3].…”

Section: Introductionmentioning

confidence: 99%

Lead fluoride Cherenkov detector read out by avalanche photodiodes for measuring the intensities of pulsed antiproton beams

Murakami

Aghai-Khozani

Hori

2019

Nuclear Instruments and Methods in Physics Research Section A:

Self Cite

View full text Add to dashboard Cite

A Cherenkov detector based on an array of five lead fluoride (β-PbF 2 ) crystals of size 30 mm×30 mm×160 mm read out by reverse-type avalanche photodiodes (APD's) of active area 10 mm×10 mm was used to measure the flux of secondary particles emerging from the annihilation of pulsed beams of antiprotons at the Antiproton Decelerator of CERN. We compared the relative photon yields of radiators made of β-PbF 2 , fused silica, UV-transparent acrylic, lead glass, and a lead-free, high-refractive-index glass. Some p-i-n photodiodes were also used for the readout, but the output signals were dominated by the nuclear counter effect (NCE) of secondary particles traversing the 300 µm thick depletion regions of the photodiodes. Smaller NCE were observed with the APD's, as the maximum electronic gain in them occurred predominately for electron-ion pairs that were generated in the thin p-type semiconductor layer that proceeded the p-n junction of high electric field where amplification took place.

show abstract

“…Interactions between a nucleon and an antinucleon are by themselves an important subject of nuclear physics. In particular data on thep-nucleon andp−nucleus annihilation process at low energies (see [44][45][46][47][48][49][50][51][52][53][54][55][56][57]) and on antiprotonic nuclei [58], as well as related theoretical analyses [47,[59][60][61][62][63][64] show that:…”

Section: Antiproton-nucleon Interactionsmentioning

confidence: 99%

Soft rescattering in the timelike proton form factor within a spacetime scheme

Bianconi

Tomasi–Gustafsson

2018

Phys. Rev. C

View full text Add to dashboard Cite

The annihilation of a lepton pair into a proton-antiproton pair, and the reverse process, allow for a measurement of the timelike proton form factors. This work aims at studying the corrections due to direct soft interactions between the proton and the antiproton before their annihilation or after their creation. The analysis is carried on in the spacetime formalism used by us in a series of recent works on timelike FFs. In particular the effect ofpp annihilation into many-meson states is considered. We expect it to determine similar real and imaginary parts for the form factor near thē pp channel threshold. We also discuss the possibility that the timelike FF differ by a phase in the hadron pair production and annihilation.PACS numbers:

show abstract

Measurement of the antiproton–nucleus annihilation cross-section at low energy

Cited by 30 publications

References 71 publications

Optical model potential analysis of n¯A and nA interactions

Optical model potential analysis of n¯A and nA interactions

Lead fluoride Cherenkov detector read out by avalanche photodiodes for measuring the intensities of pulsed antiproton beams

Soft rescattering in the timelike proton form factor within a spacetime scheme

Contact Info

Product

Resources

About