Theory of Radiation Chemistry. IX. Model and Structure of Heavy Particle Tracks in Water

Mozumder, A.; Chatterjee, A.; Magee, John L.

doi:10.1021/ba-1968-0081.ch002

Cited by 28 publications

(10 citation statements)

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“…The passage of a particle in a noble liquid produces a structured track along its path that is conveniently described in terms of a core and a penumbra [23]. The penumbra that surrounds the core is a low ionization density zone.…”

Section: Birk's Saturation Lawmentioning

confidence: 99%

A model of nuclear recoil scintillation efficiency in noble liquids

Mei

Yin

Stonehill

et al. 2008

Astroparticle Physics

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Scintillation efficiency of low-energy nuclear recoils in noble liquids plays a crucial role in interpreting results from some direct searches for Weakly Interacting Massive Particle (WIMP) dark matter. However, the cause of a reduced scintillation efficiency relative to electronic recoils in noble liquids remains unclear at the moment. We attribute such a reduction of scintillation efficiency to two major mechanisms: 1) energy loss and 2) scintillation quenching. The former is commonly described by Lindhard's theory and the latter by Birk's saturation law. We propose to combine these two to explain the observed reduction of scintillation yield for nuclear recoils in noble liquids. Birk's constants kB for argon, neon and xenon determined from experimental data are used to predict noble liquid scintillator's response to low-energy nuclear recoils and low-energy electrons. We find that energy loss due to nuclear stopping power that contributes little to ionization and excitation is the dominant reduction mechanism in scintillation efficiency for nuclear recoils, but that significant additional quenching results from the nonlinear response of scintillation to the ionization density.

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Section: Birk's Saturation Lawmentioning

confidence: 99%

A model of nuclear recoil scintillation efficiency in noble liquids

Mei

Yin

Stonehill

et al. 2008

Astroparticle Physics

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“…The structure of a heavy-ion track can be described as concentric cylinders consisting of a central core and a surrounding penumbra [27]. The core is a region of high excitation density created by direct interaction, glancing collisions, of the primary particle and also, to some extent, by δ-rays.…”

Section: Electronic Quenchingmentioning

confidence: 99%

“…The track core radius, r 0, for non-relativistic ions is given by the Bohr-criterion, r 0 =ћv/2E 1 where ћ is Plank's constant divided by 2π, v is the velocity of incident ion and E 1 is the energy of lowest electronic excited state of the medium [27]. For liquid Xe, E 1 = 8.2 eV [30].…”

Section: Electronic Quenchingmentioning

confidence: 99%

Properties of liquid xenon scintillation for dark matter searches

Hitachi

2005

Astroparticle Physics

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The scintillation yields and decay shapes for recoil Xe ions produced by WIMPs in liquid xenon have been examined. A quenching model based on a biexcitonic diffusion-reaction mechanism is proposed for electronic quenching. The total predicted quenching, nuclear and electronic, is compared with experimental results reported for nuclear recoils from neutrons. Model calculations give the average energy to produce a vuv photon, W ph , to be ~75 eV for 60 keV recoil Xe ions. Some aspects of ionization relating to liquid xenon WIMP detectors are also discussed.

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“…Using such a subcharacterization, Mozumder et al (1968) have described the geometrical pattern of energy deposition in terms of two physically distinct regions called "core 11 and "penumbra." The concept of core is more suitable for applications in condensed states of matter in radiation chemistry and radiation biology, and the exact size of the core will depend on the chemical composition of the absorbing material.…”

Section: Electromagnetic Interactionsmentioning

confidence: 99%