Measurement of ion cascade energies through resolution degradation of alpha particle microcalorimeters
- National Institute of Standards and Technology, 325 Broadway MS 817.03, Boulder, Colorado (United States)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Atomic cascades caused by ions impinging on bulk materials have remained of interest to the scientific community since their discovery by Goldstein in 1902. While considerable effort has been spent describing and, more recently, simulating these cascades, tools that can study individual events are lacking and several aspects of cascade behavior remain poorly known. These aspects include the material energies that determine cascade magnitude and the variation between cascades produced by monoenergetic ions. We have recently developed an alpha particle detector with a thermodynamic resolution near 100 eV full-width-at-half-maximum (FWHM) and an achieved resolution of 1.06 keV FWHM for 5.3 MeV particles. The detector relies on the absorption of particles by a bulk material and a thermal change in a superconducting thermometer. The achieved resolution of this detector provides the highest resolving power of any energy dispersive technique and a factor of 8 improvement over semiconductor detectors. The exquisite resolution can be directly applied to improved measurements of fundamental nuclear decays and nuclear forensics. In addition, we propose that the discrepancy between the thermodynamic and achieved resolution is due to fluctuations in lattice damage caused by ion-induced cascades in the absorber. Hence, this new detector is capable of measuring the kinetic energy converted to lattice damage in individual atomic cascades. This capability allows new measurements of cascade dynamics; for example, we find that the ubiquitous modeling program, SRIM, significantly underestimates the lattice damage caused in bulk tin by 5.3 MeV alpha particles.
- OSTI ID:
- 21476152
- Journal Information:
- Journal of Applied Physics, Vol. 107, Issue 4; Other Information: DOI: 10.1063/1.3309279; (c) 2010 American Institute of Physics; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ALPHA DETECTION
ALPHA PARTICLES
CALORIMETERS
CALORIMETRY
COMPUTERIZED SIMULATION
CRYSTAL LATTICES
ENERGY RESOLUTION
FLUCTUATIONS
IONS
KEV RANGE
KINETIC ENERGY
MEV RANGE
PHYSICAL RADIATION EFFECTS
SEMICONDUCTOR DETECTORS
SUPERCONDUCTING DEVICES
TEMPERATURE MEASUREMENT
CHARGED PARTICLE DETECTION
CHARGED PARTICLES
CRYSTAL STRUCTURE
DETECTION
ENERGY
ENERGY RANGE
IONIZING RADIATIONS
MEASURING INSTRUMENTS
RADIATION DETECTION
RADIATION DETECTORS
RADIATION EFFECTS
RADIATIONS
RESOLUTION
SIMULATION
SORPTION
VARIATIONS