Accurate stopping power measurements for (0.21–2.68)MeV/u 1H+ and 4He+ ions crossing thin Al foils; extraction of the (I, b) parameters

Moussa, D.; Damache, S.; Ouichaoui, S.

doi:10.1016/j.nimb.2014.11.007

Cited by 9 publications

(7 citation statements)

References 26 publications

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“…elsewhere [12][13][14][15][16][17]25]. Then, only an account of the main experimental aspects is given in the following subsection.…”

Section: Experimental Set Up and Methodsmentioning

confidence: 99%

“…This method [12][13][14][15][16][17]25] is very powerful for macroscopic non-uniformity scanning [25] since it relates only to ∆ ( measurements achieved with good accuracy. Multi-Gaussian curves were fitted to the experimental energy loss distributions recorded for alpha particles from the mixed radioactive source crossing the kapton target.…”

Section: Target Foil Properties Thickness and Non-uniformity Investig...mentioning

confidence: 99%

“…The ion mean energy loss and energy loss straggling variance are statistical quantities of crucial importance regarding both the understanding of the fundamental aspects of ion-matter interactions and ion beam analysis various applications [1][2][3][4][5][6][7][8]. The ion mean energy loss per travelled path length, i.e., the target material stopping power, , has been extensively investigated for various ion-target combinations over a wide range of ion bombarding energies [9][10][11][12][13][14][15][16][17][18][19]. In contrast, the energy loss straggling variance, Ω…”

Section: Introductionmentioning

confidence: 99%

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Stopping powers and energy loss straggling for (0.9–3.4) MeV protons in a kapton polyimide thin film

Damache

Djaroum²,

Ouichaoui

et al. 2016

Nuclear Instruments and Methods in Physics Research Section B:

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The energy loss and energy loss straggling widths have been measured in transmission for 0.9 -3.4 MeV protons traversing a thin kapton polyimide foil. In a prior step, the thickness and non-uniformity of the target foil were carefully investigated. The overall relative uncertainties in the stopping power and energy loss straggling variance data amount, respectively, to less than 2% and 8%. The experimental data show to be in excellent agreement with available previous ones and with those compiled in the ICRU-49 report. They are fully consistent with the predictions of Sigmund-Schinner's binary collision theory of electronic stopping over the whole proton energy range explored. An average deviation of ~2.5% relative to values calculated by the SRIM-2008 code, likely due to effects of valence electrons involving the , and bonds, is however observed at low proton velocities. The measured energy loss straggling data, which are unique to our knowledge, are found to be in good agreement with values derived by the classical Bohr formula for ≳ 1300 keV but they significantly exceed Bohr's collisional energy loss straggling at lower proton velocities where target electrons can no longer be considered as free. They also show to be consistent with the predictions of the Bethe-Livingston and Sigmund-Schinner theories over the low proton velocity region ( 1300 keV). However, they are significantly overestimated by these theories over the intermediate and high proton velocity regions, which may be due to bunching effect by inner shell electrons of the polymer target. Besides, our energy loss straggling data are in better overall consistency with the Yang, O'Connor and Wang empirical formula for 1300 keV, while deviations above the latter amounting up to ~18% are observed at lower proton velocities.

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“…elsewhere [12][13][14][15][16][17]25]. Then, only an account of the main experimental aspects is given in the following subsection.…”

Section: Experimental Set Up and Methodsmentioning

confidence: 99%

Section: Target Foil Properties Thickness and Non-uniformity Investig...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stopping powers and energy loss straggling for (0.9–3.4) MeV protons in a kapton polyimide thin film

Damache

Djaroum²,

Ouichaoui

et al. 2016

Nuclear Instruments and Methods in Physics Research Section B:

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“…Even though more than a century of extensive investigation has passed, the process of energy loss 3 still configures an active field in modern science and technological applications. Precise and quantitative measurements with ion beams are required in material science and engineering [9,10,11,12], medical physics (radiotherapy) [13], ion implantation and modification of materials [14], and also in practically all Ion Beam Analysis (IBA) techniques [15,16,17,18,19,20]. Current research may be divided in two main categories: i) measuring accurate and reliable stopping power data, and ii) improving fundamental physics models, in other words: stopping power is a prerequisite for precise validation of theoretical models.…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

“…Stopping cross section of aluminum for protons with energies ranging from 1 MeV up to 10 GeV evaluated according to the final Bethe-Bloch equation 2 16,. taking in account all the stopping numbers: L 0 Eq.…”

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confidence: 99%

Energy loss of light ions (H+ and He+) in matter: high accuracy measurements and comparison with the FEG model

Moro¹

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The phenomenon of energy loss that occurs when an ion interacts with matter, also called stopping power, has been investigated for more than a century, and has provided findings of interest. However, reliable procedures for obtaining accurate experimental measurements and a fully theoretical comprehension of the process are tasks still in high demand by the scientific community. Moreover, stopping power data are prerequisites in several applications in modern science, such as engineering, ion implantation and modification of materials, damage to electronics devices (e.g. space radiation), medical physics (e.g. proton therapy), among others. In this thesis we i) develop a rigorous experimental protocol to measure stopping power with high precision, and ii) investigate 1 the collapse of the free electron gas (FEG) model in energy loss of light ions (protons) at a low energy range in transition and rare-earth metals. In the first part, we present an approach to obtain, with high accuracy, the stopping cross sections in the pure materials Al and Mo for protons in the energy range of [0.9 − 3.6] MeV by means of the transmission method. The traceability of the sources of uncertainties are fully evaluated and the final accuracy of the results is 0.63 % (0.32 % rand. and 0.54 % syst.) for Al, and 1.5 % (0.44 % rand. and 1.4 % syst.) for Mo, with both results primarily limited by the quality and homogeneity of the stopping foils. For Al, this high accuracy represents an improvement com-Foremost I want to express my gratitude to my advisor, co-author and friend Prof. Dr. Manfredo H. Tabacniks. His guidance, encouragement over the years, vast scientific knowledge and notable vision in many other areas (e.g. ethics and interaction with participants) have always inspired me to reach interesting findings in physics and in life, always expanding my mind. Without his support, the accomplishments here presented would never have been possible. Thank you so much.

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Energy Loss of Swift Heavy Ions: Fundamentals and Theoretical Formulations

Sharma

Diwan

Kumar

2019

Radiation Effects in Polymeric Materials

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Accurate stopping power measurements for (0.21–2.68)MeV/u 1H+ and 4He+ ions crossing thin Al foils; extraction of the (I, b) parameters

Cited by 9 publications

References 26 publications

Stopping powers and energy loss straggling for (0.9–3.4) MeV protons in a kapton polyimide thin film

Stopping powers and energy loss straggling for (0.9–3.4) MeV protons in a kapton polyimide thin film

Energy loss of light ions (H+ and He+) in matter: high accuracy measurements and comparison with the FEG model

Energy Loss of Swift Heavy Ions: Fundamentals and Theoretical Formulations

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