Charge transfer and ionisation by intermediate-energy heavy ions

Area of Science:

• Atomic and Molecular Physics
• Radiation Biology
• Biophysics

Background:

• Heavy ion microbeam studies require accurate cross-section data for mammalian cell response.
• Partially 'dressed' ions, common at low energies, have rare interaction data, hindering accurate energy deposition simulations.
• Monte Carlo track structure simulations need comprehensive databases of ionisation and charge transfer cross sections.

Purpose of the Study:

• To measure total and differential ionisation cross sections for heavy ions interacting with tissue constituents.
• To provide essential data for Monte Carlo simulations of energy deposition and cellular damage.
• To investigate multiple ionisation and charge transfer processes prevalent in heavy ion interactions.

Main Methods:

• Utilizing the recoil ion time-of-flight method to measure total ionisation cross sections.
• Initiating measurements of differential ionisation cross sections for detailed track structure simulations.
• Conducting experiments at East Carolina University to gather cross-section data.

Main Results:

• Measurements of differential, total, and multiple ionisation cross sections are described.
• Electron capture and loss cross sections for C(+) ions at specific energies are presented.
• Data provides crucial input for refining Monte Carlo simulations of ion-matter interactions.

Conclusions:

• Accurate cross-section data for partially dressed heavy ions is vital for understanding cellular radiation damage.
• The recoil ion time-of-flight method is effective for measuring multiple ionisation and charge transfer cross sections.
• Ongoing measurements will enhance the predictive power of radiation transport simulations in biological systems.