Energy loss of Clq+ (52MeV) through dilute H2 target: Evidence of non-linear term and non-Coulombian potential contribution

Chabot, M.; Nectoux, M.; Maynard, G.; Deutsch, C.

doi:10.1016/j.nima.2007.02.029

Cited by 1 publication

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References 16 publications

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“…Qualitatively, two effects may distort the SDCS of bare ions: the saturation effect, which is a deviation from the Z 2 law occuring at large pertubation K ∼ charge velocity intensity, Wohrer et al 1986) and the well-known screening effect (McGuire et al 1981), which takes into account the screening on the nuclear charge by the bound projectile electrons in the excitation/ionization of the target. For the stopping power of heavy projectiles at equilibrium charge state in H 2 , these two corrections were found acting in an opposite way (Chabot et al 2007). The SDCS for bare or partially stripped ions are likely to behave similarly.…”

Section: Secondary Electron Coefficent φ S (Ze)mentioning

confidence: 99%

Cosmic-ray slowing down in molecular clouds: Effects of heavy nuclei

Chabot

2015

A&A

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Context. A cosmic ray (CR) spectrum propagated through ISM contains very few low-energy (<100 MeV) particles. Recently, a local CR spectrum, with strong low energy components, has been proposed to be responsible for the over production of H + 3 molecule in some molecular clouds. Aims. We aim to explore the effects of the chemical composition of low-energy cosmic rays (CRs) when they slow down in dense molecular clouds without magnetic fields. We considered both ionization and solid material processing rates. Methods. We used galatic CR chemical composition from proton to iron. We propagated two types of CR spectra through a cloud made of H 2 : those CR spectra with different contents of low energy CRs and those assumed to be initially identical for all CR species. The stopping and range of ions in matter (SRIM) package provided the necessary stopping powers. The ionization rates were computed with cross sections from recent semi-empirical laws, while effective cross sections were parametrized for solid processing rates using a power law of the stopping power (power 1 to 2). Results. The relative contribution to the cloud ionization of proton and heavy CRs was found identical everywhere in the irradiated cloud, no matter which CR spectrum we used. As compared to classical calculations, using protons and high-energy behaviour of ionization processes (Z 2 scaling), we reduced absolute values of ionization rates by few a tens of percents but only in the case of spectrum with a high content of low-energy CRs. We found, using the same CR spectrum, the solid material processing rates to be reduced between the outer and inner part of thick cloud by a factor 10 (as in case of the ionization rates) or by a factor 100, depending on the type of process.

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Section: Secondary Electron Coefficent φ S (Ze)mentioning

confidence: 99%

Cosmic-ray slowing down in molecular clouds: Effects of heavy nuclei

Chabot

2015

A&A

View full text Add to dashboard Cite

show abstract

Energy loss of Clq+ (52MeV) through dilute H2 target: Evidence of non-linear term and non-Coulombian potential contribution

Cited by 1 publication

References 16 publications

Cosmic-ray slowing down in molecular clouds: Effects of heavy nuclei

Cosmic-ray slowing down in molecular clouds: Effects of heavy nuclei

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