Fast deuteron production in proton-nucleus interactions

Büscher, M.; Sibirtsev, A.; Sistemich, K.

doi:10.1007/bf01290683

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…A similar peak structure has been predicted [19] for the deuteron spectrum at T p = 1.0 GeV and, thus, this spectrum can be considered as first direct experimental evidence of the two-step production below threshold. However, detailed model calculations still have to show whether the observed peak structure cannot be faked by competing processes like coalescence [22] or pick-up reactions. Another source of K + d pairs might be the kaon production on two-(or multi-) nucleon clusters [4,18] which is expected to yield deuterons with similar momentum distributions as from the two-step mechanism.…”

Section: Production Mechanismsmentioning

confidence: 99%

PRODUCTION OF K⁺ MESONS IN PROTON–NUCLEUS INTERACTIONS

Buescher¹,

M.Nekipelov²

2003

Meson 2002

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The production of K + -mesons in pA (A = C, Cu, Ag, Au) collisions has been investigated at the COoler SYnchrotron COSY-Jülich at beam energies T p = 1.0 . . . 2.3 GeV using the ANKE spectrometer. ANKE allows to measure double differential cross sections for K + -production at forward angles ϑ < 12 • in a wide momentum range. The cross sections obtained in these experiments together with those from literature show a uniform behavior as functions of momentum transfer and excitation energy of the residual nucleus. At the lowest measured beam energy, far below the free N N -threshold (T N N = 1.58 GeV), the data reveal a high degree of collectivity in the target nucleus. The spectra obtained above threshold should allow one to extract the nuclear K + -potential with an accuracy of better than ±3 MeV. Information about the mechanisms leading to K +production can be obtained from K + p and K

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Section: Production Mechanismsmentioning

confidence: 99%

PRODUCTION OF K⁺ MESONS IN PROTON–NUCLEUS INTERACTIONS

Buescher¹,

M.Nekipelov²

2003

Meson 2002

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“…To a first approximation, antiproton ( p) and antineutron ( n) productions in high-energy proton-proton (pp) collisions should be approximately equal. Such a fact is implicit in the coalescence model [1] calculations used to characterize light anti-nuclei production in highenergy heavy-ion collisions. Yet, isotopic effects have recently been proposed [2] to significantly affect this symmetry, resulting in an enhanced n production.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study to characterize the production of antineutrons in high energy pp collisions through charge exchange interactions

Lugo-Porras,

Gomez-Coral,

Menchaca-Rocha

2024

J. Phys. G: Nucl. Part. Phys.

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Simulations to evaluate the feasibility of antineutron identification and kinematic characterization via the hadronic charge exchange (CEX) interaction $n+\bar{n}\rightarrow p+\bar{p}$ are reported. The target neutrons are those composing the silicon nuclei of which inner tracking devices present in LHC experiments (ALICE, ATLAS, and CMS) are made. Simulations of $pp$ collisions in PYTHIA were carried out at different energies to investigate $\bar{n}$ production and the expected $\bar{n}$ energy spectra. These simulations produced a decreasing power-law $\bar{n}$ energy spectra. Then, two types of GEANT4 simulations were performed, placing an $\bar{n}$ point source at the ALICE primary vertex as a working example. In the first simulation, the $E_k$ was kept at an arbitrary (1 GeV) fix value to develop an $\bar{n}$ identification and kinematics reconstruction protocol. The second GEANT4 simulation used the resulting PYTHIA at $\sqrt{s_{pp}}=13$ TeV $\bar{n}$ energy spectra. In both GEANT4 simulations, the occurrence of CEX interactions was identified by the unique outgoing $\bar{p}$. The simplified simulation allowed to estimate a 0.11\% CEX-interaction identification efficiency at $E_k = 1$ GeV. The ${p}$ CEX-partner identification is challenging because of the presence of silicon nucleus-fragmentation protons. Momentum correlations between the $\bar{n}$ and all possible $\bar{p}p$ pairs showed that $p$ CEX-partner identification and $\bar{n}$ kinematics reconstruction corresponds to minimal momentum-loss events. The use of ITS $dE/dx$ information is found to improve $\bar{n}$ identification and kinematic characterization in both GEANT4 simulations. The final protocol applied to the realistic GEANT4 simulation resulted in a $\bar{n}$ identification and kinematic reconstruction efficiency of 0.006\%, based solely on $\bar{p}p $ pair observable. Thus, the expected rate of identified and kinematically reconstructed $\bar{n}$’s should lie in the order of 100,000 per second, illustrating the feasibility of the method.

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