The charge state distribution of Si projectiles with energies ranging from 1.78 to 3.93 MeV/u, and initial charge states Sip+(p = 4 - 10), was investigated after traversing a 10μg/cm2 carbon foil.This study was focused on determining the relevant parameters of the outgoing projectile such as the charge state distribution fraction (Fq), the mean charge state (qm), distribution width (w), and asym./skewness parameter (s).These parameters were then compared with predictions from the Fermi gas model and ETACHA4.Notably, a significant disparity was observed between the exptl. measurements and the theor. calculations, with the latter overestimating the former.This overestimation was attributed to non-radiative electron capture (NREC) occurring at the exit surface, influenced by the wake and dynamic screening effects.Understanding and accurately determining the charge state distribution parameters hold immense importance in various scientific applications including in the field of plasma studies, these fractions of charge states are directly utilized to tackle complex problems and facilitate the detection of superheavy ions.Furthermore, these parameters play a vital role in enhancing our understanding of ion behavior, collision dynamics, and plasma characteristics.The insight observed from such parameters may be used to refine the theor. models for accurate predictions and in planning of experiments involving ion interactions.

2025-04-01·Vacuum

Measurement of Arq+ ion induced tungsten M x-ray relative intensity ratio with energy dependence

作者: Swami, D. K. ; Kaur, Sandeep ; Singh, Balwinder ; Karn, R. K.

The measurement of M-shell x-ray production from ₇₄W under energetic highly charged ion (Ar^q+) impact has been reported.The intensity ratios, I_Mk/I_Mαb, (Wherek = ξ,γ,δ,m1,m2) for Tungsten induced by 875-2100 keV Ar^q+(q = 7,8) ions have been measured.These intensity ratios have been compared with estimated intensity ratios based on ECPSSR and ECUSAR models.Significant difference have been observed between measured and estimated intensity ratios.However, no significant effect of the mean charge state or projectile vacancy configuration is found on the theor. intensity ratios.For present measurements, natural ₇₄W targets of ∼ 230μg/cm² thickness, deposited on a very thin carbon backing of 12μg/cm² thickness, have been fabricated in ultra-high vacuum environment by the evaporation method using 8 kW electron beam.The targets have been characterized by X-ray Diffractometry, SEM, and Energy Dispersive X-ray Spectroscopy.The thicknesses of the targets have been measured using the Rutherford Backscattering Spectrometry.

2025-03-01·Physics Letters B

On extraction of ground state deformation parameters from quasielastic and fusion excitation functions

作者: Kumar, Chandra ; Nath, S.

Measurement of back-angle quasielastic scattering around the barrier, in conjunction with coupled-channels calculation, has been reported in recent years to be an effective and sensitive method to determine ground state deformation parameters of nuclei in the sd-shell as well as rare earth regions.Consequently, quasielastic scattering has been proposed to be a promising probe for extraction of ground state deformation parameters of short-lived radioactive nuclei.Theor. investigations of quasielastic scattering and fusion for the system ²⁸Si+¹⁴⁴Sm, within the coupled-channels framework, are reported here.Fusion barrier height distribution is derived from measured fusion excitation function by an analytic method assuming the former to be a multi-Gaussian function.Bayesian analyses are carried out, both for fusion and quasielastic scattering data, to optimally determine quadrupole and hexadecapole deformation parameters of ²⁸Si.The results suggest that extracted values are not free from ambiguities, thus necessitating utmost caution while extracting ground state deformation parameters following this method.

100 项与 Inter University Accelerator Centre 相关的药物交易

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100 项与 Inter University Accelerator Centre 相关的转化医学

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