The relativistic rise of the track density in bubble chambers

With the availability of single-photon detecting Si APD's and multi-anode PM tubes, the technical basis for the detection of Cherenkov light produced by Compton electrons in a dense absorbing detector from 1 to 10 MeV gamma rays is given.In a Monte Carlo simulation study using detailed electron track and Cherenkov light simulation, we show that in many transparent materials enough visible light photons are created (up to 400) to support detection of high energy gamma rays.Since the opening angle of the light cone is practically saturated, the reconstruction of the 3D position of interaction should be possible. At the same time we found that the angular spread is dominated by multiple scattering, compromising this option.However, a more detailed study of materials shows that optimization may make possible good position resolution and depth measurement for parallax correction.

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“…The number of encounters dn of energy transfer E: in the interval dE: and the track length t is given by [6]:…”

Section: Electron Trackmentioning

confidence: 99%

High energy gamma-ray imaging using Cherenkov cone detection - A Monte Carlo study with application to a Compton camera system

Peterson

Brill

Walenta

2012

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)

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“…Models relating the ionisation losses in gases to the photo-absorption cross section and the ε of the gas have been developed from the 1960s [7][8][9]. This has resulted in several computer programs, e.g.…”

Section: Ionisation Modelsmentioning

confidence: 99%

Numerical methods in the simulation of gas-based detectors

Veenhof

2009

J. Inst.

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aftermath of the second world war to solve numerical problems in atomic physics and to calculate ballistic trajectories. Computers are ubiquitous in particle physics laboratoria since the 1960s. CERN for instance installed its first computer in 1958, a vacuum-tube Ferranti Mercury which was replaced in 1960 by an IBM 709 [1]. In the years 1962-1967, Johannes Ranft used these computers to develop the first versions of Fluka to simulate hadron cascades. M. Veltman, during a stay at SLAC in 1963-1964, wrote the first versions of the symbolic manipulation program Schoonschip [2, 3], which was to prove useful in 1971. A first version of the Geant detector simulation program came soon after (1974, CERN), followed by the MNCP neutrons, γ and electron program (1977, LANL), and the EGS electron and γ shower simulation (1978, SLAC). Calculations for gas-based detectors have 3 main components: ionisation, field calculation and charged particle transport. In the following, we sketch the development of some computer programs that simulate each of these. No attempt is made to be complete.

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“…Consequently, the problem is reduced to the case of a homogeneous medium ~2-The close collisions are usually considered to be interactions of the projectile with free electrons. In calculating the local energy loss the limiting parameter qo falls out (see (20)). This is not the case for o-K; one can put q 2~-2 m o ) r in the contribution due to distant collisions.…”

Section: =A2/(dwf/dz)~-035 For the Dense Medium-gasmentioning

confidence: 99%

“…If the spatial dispersion is taken into account, as e.g. in the Photoabsorption Ionization Model [11,18,20], then the integrals in (3) converge and (3) can be used to describe all collisions.…”

Section: General Expressions Qualitative Considerationsmentioning

confidence: 99%

Anomalous density effect near the interface between two media

Chechin

Ermilova

1989

Z Phys D - Atoms, Molecules and Clusters

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A theoretical investigation is presented for the local energy loss of a relativistic charged particle and the K-shell excitation cross section aK when the particle crosses a sharp interface between two different media. The logarithmic increase of the local energy loss and o-K with the particle energy is shown to differ essentially from the case of a homogeneous medium. The calculations of e~ for aluminum and copper foils are in good agreement with the experimental data.

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The relativistic rise of the track density in bubble chambers

Cited by 27 publications

References 18 publications

High energy gamma-ray imaging using Cherenkov cone detection - A Monte Carlo study with application to a Compton camera system

High energy gamma-ray imaging using Cherenkov cone detection - A Monte Carlo study with application to a Compton camera system

Numerical methods in the simulation of gas-based detectors

Anomalous density effect near the interface between two media

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