Production of Charged Pions by 730-MeV Protons from Hydrogen and Selected Nuclei

Cochran, D. R. F.; Dean, Phillip N.; Gram, P. A. M.; Knapp, E.A.; Martin, E.R.; Nagle, D. E.; Perkins, R. B.; Shlaer, W.; Thiessen, H. A.; Theriot, E.D.

doi:10.1103/physrevd.6.3085

Cited by 149 publications

(75 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental data 5) at the Lawrence Radiation Laboratry was taken up as a benchmarking problem for pion (plus and minus) production cross sections by 730-MeV protons accelerated by 184-in. cyclotron on Carbon, Aluminum, Copper and Lead solid targets at wide angles in the interval 15 to 150 degrees.…”

Section: Experimental Datamentioning

confidence: 99%

Benchmarking of PHITS on Pion Production for Medium-Energy Physics

Matsuda

Iwamoto

Iwase

et al. 2011

Progress in Nuclear Science and Technology

View full text Add to dashboard Cite

show abstract

Section: Experimental Datamentioning

confidence: 99%

Benchmarking of PHITS on Pion Production for Medium-Energy Physics

Matsuda

Iwamoto

Iwase

et al. 2011

Progress in Nuclear Science and Technology

View full text Add to dashboard Cite

show abstract

“…The latter consists of an EW angle dependence of the GC momentum, which is maximum at one side and minimum at the opposite for a given charge of the particle, and conversely for the other charge (see below). The difference of production cross sections for π + and π − , which is large at low incident proton energies [8] (see [9] for pp → π + X asymmetry), could also generate the observed effect. It could also result from a combination of both effects.…”

mentioning

confidence: 99%

“…However, the very broad incident energy range to be covered here required the functional form used, to be modified. Good results could be obtained between 0.73 GeV and 200 GeV incident kinetic energies [19] using the data from [8,13,14,15]. A set of lower energy data were used [16] to constrain the energy dependence of the integrated cross section close to threshold.…”

mentioning

confidence: 99%

Secondary electrons and positrons in near earth orbit

2001

View full text Add to dashboard Cite

The secondary e + and e − populations in near earth's orbit have been calculated by simulation. The results are in very good agreement with the recent AMS measurements. The e + over e − flux ratio for particles below the geomagnetic cutoff appears to be due to the geomagnetic East-West effect.The study of particle populations in the earth environment has been a field of intense research activity for more than 50 years [1]. After a period of latence, the field is regaining interest with the new generation of ambitious experimental projects. They should bring major improvements to the instrumental accuracy of the measurements and orders of magnitudes to the statistics of counting, with respect to previous experiments (see the references quoted in [2,3] for the current and historical context). Some new measurements of particle flux close to earth have been performed recently by the AMS experiment, providing a large sample of new data. These measurements open new prospects for high precision studies of the cosmic ray (CR)-atmosphere interactions and the dynamics of particles in the magnetosphere. This is of particular importance for the atmospheric neutrino issue, in the current context of this research field, since the knowledge of the (electron and muon) neutrino flux produced in the same decay chain of pions in the atmosphere is necessary for interpreting the results of the underground neutrino experiments [4]. Consequently, a good understanding of the electron and positron flux is highly relevant.The proton distributions measured below the earth geomagnetic cutoff (GC) by AMS [2] have been successfully interpreted recently in terms of interactions of the (proton) cosmic ray (CR) flux with the atmosphere [5]. This work is referred to as I in the following. Extending the work reported in I on protons, the present paper addresses the interpretation of the flux of positrons and electrons measured by AMS below the cutoff (subGC) [3] in the same phenomenological framework.The lepton distributions observed by AMS showed a few remarkable features, of which the main two follow. First, the kinetic energy spectra have a strong subGC (then secondary) component (figure 1), similar to those observed in the proton flux. Second, the ratio of the e + over e − flux is large in the equatorial region (≈ 4) and decreasing towards higher latitudes (≈ 1). The measured spectra extended from the kinetic energy threshold of the spectrometer at ≈0.15 GeV, up to about 30 GeV for e − and 3 GeV for e + . At low energy, the subGC secondary spectral yield decreases rapidly from a maximum around the low energy limit of the spectrometer up to the GC energy, around 15 GeV/c for equatorial latitudes (electrons) where 1

show abstract

“…In reference [2], the parameterizations of equations (1) - (3) were compared only to nine data points from Whitmore [3] at p lab = 12, 19 and 24 GeV. In the present work, they are compared to the Whitmore data at 69, 102, 205 and 303 GeV, as well as to some other low energy data [4][5][6][7], and the data point at p lab = 954 MeV corresponding to T lab = 400 MeV, of Abd El-Samad et al [8]. The cross section for the reaction pp → ppπ 0 is 0.1 mb.…”

mentioning

confidence: 99%

“…The worst example is the threshold data point at p lab = 1.38 GeV in Fig. 2, where the experimental value is 0.03 ± 0.01 mb [5], compared to the parameterization value of 0.97 mb. This difference cannot be seen in the figure due to the very small value of the cross section near threshold.…”

mentioning

confidence: 99%

Total cross section parameterizations for pion production in nucleon–nucleon collisions

Norbury

2009

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

Total cross section parameterizations for neutral and charged pion production in nucleon-nuelcon collisions are compared to an extensive set of experimental data over the projectile momentum range from threshold to 300 GeV. Both proton-proton and proton-neutron reactions are considered. Good agreement between parameterizations and experiment is found, and therefore the parameterizations will be useful for applications, such as transport codes.PACS numbers: 13.75.CsMany astrophysical gamma rays and neutrinos result from the decay of pions produced in interstellar protonproton (pp) collisions [1]. Most of the muons that travel through the Earth's atmosphere and reach ground level are also the result of pion decay. In modeling astrophysical and cosmic ray sources, one requires an accurate knowledge of pion production cross sections from nucleon-nucleon collisions. Furthermore, because these cross sections are most often used as input to transport codes, it is very useful to have them in a simple, parameterized form, so that the transport codes can run efficiently. Such parameterizations are the subject of this Brief Report. Previous parameterizations have been developed [2] for total pion production cross sections in pp collisions. However, these results were compared to only nine experimental data points, and therefore one did not have much confidence in their validity. In the present work, these same parameterizations are compared to approximately thirty experimental data points. The good agreement obtained gives greater confidence in the use of these parameterizations.The total inclusive cross section for pion production in proton-proton collisions has been parameterized as [2] σ pp→π + X = 0.00717 + 0.0652 log T lab T lab + 0.162

show abstract

Production of Charged Pions by 730-MeV Protons from Hydrogen and Selected Nuclei

Cited by 149 publications

References 24 publications

Benchmarking of PHITS on Pion Production for Medium-Energy Physics

Benchmarking of PHITS on Pion Production for Medium-Energy Physics

Secondary electrons and positrons in near earth orbit

Total cross section parameterizations for pion production in nucleon–nucleon collisions

Contact Info

Product

Resources

About