A user-friendly fully digital TDPAC-spectrometer

Jager, M. F.; Iwig, K.; Butz, T.

doi:10.1007/s10751-010-0201-8

Cited by 9 publications

(20 citation statements)

References 6 publications

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“…The toluene fraction thus contains only the endofullerenes alongwith pure fullerene molecules. Toluene was evaporated to get the dried endofullerene fraction which was then counted on the TDPAC setup [19] …”

Section: Methodsmentioning

confidence: 99%

Perturbed Angular Correlation Study of the Static and Dynamic Aspects of Cadmium and Mercury Atoms Inside and Attached to a C₆₀ Fullerene Cage

Das

Guin

Banerjee

et al. 2014

Zeitschrift Für Naturforschung A

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30 keV 111m Cd and 50 keV 199m Hg beams from ISOLDE were used to implant on preformed targets of C 60 with a thickness of 1 mg cm −2 . Endofullerene compounds, viz. 111m Cd@C 60 and 199m Hg@C 60 formed during implantation were separated by filtration through micropore filter paper followed by solvent extraction. Dried samples of the endofullerene compounds were counted for the time differential perturbed angular correlation (TDPAC) measurement using the coincidence of the 151 -245 keV cascade of 111m Cd and the 374 -158 keV cascade of 199m Hg on a six LaBr 3 (Ce) detector system coupled with digital electronics. The results for 111m Cd@C 60 indicate a single static component (27%) and a fast relaxing component (73%), the latter implying that the cadmium atom moves rapidly inside the cage at room temperature. The quadrupole interaction frequency and asymmetry parameter of the cadmium atom occupying the static site in C 60 are ω Q = 8.21(36) Mrad s −1 and η = 0.41(9), respectively. The fast relaxation constant is 0.0031(4) ns −1 . Similarly, mercury atoms also exhibit a single static and a fast component. The static site has a quadrupole frequency ω Q = 283.0(12.4) Mrad s −1 and η = 0 with a fraction of 30%. The fast relaxation constant is 0.045(8) ns −1 with a fraction of 70%, very similar to that of cadmium.

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Section: Methodsmentioning

confidence: 99%

Perturbed Angular Correlation Study of the Static and Dynamic Aspects of Cadmium and Mercury Atoms Inside and Attached to a C₆₀ Fullerene Cage

Das

Guin

Banerjee

et al. 2014

Zeitschrift Für Naturforschung A

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“…More recently, a concerted programme has been undertaken to digitize these analogue setups to take advantage of the increase in computational and electronic capability since the design of the original PAC setups in the early 1970s. Such setups are routinely used for experiments in both 4-and 6-detector configurations [32][33][34]. In addition, BaF 2 detectors are now being replaced by LaBr 3 and CeBr 3 , allowing for a considerable increase in the energy resolution, with good time resolution, and the number of isotopes which can be exploited for PAC.…”

Section: Perturbed Angular Correlationmentioning

confidence: 99%

The solid state physics programme at ISOLDE: recent developments and perspectives

Johnston

Schell

Correia

et al. 2017

J. Phys. G: Nucl. Part. Phys.

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Solid state physics (SSP) research at ISOLDE has been running since the mid-1970s and accounts for about 10%–15% of the overall physics programme. ISOLDE is the world flagship for the on-line production of exotic radioactive isotopes, with high yields, high elemental selectivity and isotopic purity. Consequently, it hosts a panoply of state-of-the-art nuclear techniques which apply nuclear methods to research on life sciences, material science and bio-chemical physics. The ease of detecting radioactivity—<1 ppm concentrations—is one of the features which distinguishes the use of radioisotopes for materials science research. The manner in which nuclear momenta of excited nuclear states interact with their local electronic and magnetic environment, or how charged emitted particles interact with the crystalline lattices allow the determination of the location, its action and the role of the selected impurity element at the nanoscopic state. ISOLDE offers an unrivalled range of available radioactive elements and this is attracting an increasing user community in the field of nuclear SSP research and brings together a community of materials scientists and specialists in nuclear solid state techniques. This article describes the current status of this programme along with recent illustrative results, predicting a bright future for these unique research methods and collaborations.

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“…2 in Ref. 8, it is possible to implement a customized circuit for filtering, pulse detection, energy data, and timestamp calculation.…”

Section: B Fpga Environmentmentioning

confidence: 99%

“…Figure 2 in Ref. 8 shows the energy spectrum mode with a γ -spectrum of 137 Cs inside the spectrometer histogram.…”

Section: Spectrometer Softwarementioning

confidence: 99%

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A compact digital time differential perturbed angular correlation-spectrometer using field programmable gate arrays and various timestamp algorithms

Jager

Iwig²,

Butz

2011

Review of Scientific Instruments

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A user-friendly fully digital time differential perturbed angular correlation (TDPAC)-spectrometer with six detectors and fast digitizers using field programmable gate arrays (FPGA) is described and performance data are given. The new spectrometer has an online data analysis feature, a compact size, and a time resolution such as conventional analog spectrometers. Its calculation intensive part was implemented inside the digitizer. This gives the possibility to change parameters (energy windows, constant fraction trigger delay) and see their influence immediately in the γ-γ correlation diagrams. Tests were performed which showed that the time resolution using a (60)Co source with energy window set at 1.17 MeV and 1.33 MeV is 265 ps with LaBr(3)(Ce) scintillators and 254 ps with BaF(2) scintillators. A true constant fraction algorithm turned out to be slightly better than the constant fraction of amplitude method. The spectrometer performance was tested with a TDPAC measurement using a (44)Ti in rutile source and a positron lifetime measurement using (22)Na. The maximum possible data rate of the spectrometer is 1.1 × 10(6) γ quanta per detector and second.

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A user-friendly fully digital TDPAC-spectrometer

Abstract: A user-friendly fully digital TDPAC-spectrometer with six detectors and fast digitizers using Field Programmable Gate Arrays is described and performance data are given.

Cited by 9 publications

References 6 publications

Perturbed Angular Correlation Study of the Static and Dynamic Aspects of Cadmium and Mercury Atoms Inside and Attached to a C₆₀ Fullerene Cage

Perturbed Angular Correlation Study of the Static and Dynamic Aspects of Cadmium and Mercury Atoms Inside and Attached to a C₆₀ Fullerene Cage

The solid state physics programme at ISOLDE: recent developments and perspectives

A compact digital time differential perturbed angular correlation-spectrometer using field programmable gate arrays and various timestamp algorithms

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A user-friendly fully digital TDPAC-spectrometer

Abstract: A user-friendly fully digital TDPAC-spectrometer with six detectors and fast digitizers using Field Programmable Gate Arrays is described and performance data are given.

Cited by 9 publications

References 6 publications

Perturbed Angular Correlation Study of the Static and Dynamic Aspects of Cadmium and Mercury Atoms Inside and Attached to a C60 Fullerene Cage

Perturbed Angular Correlation Study of the Static and Dynamic Aspects of Cadmium and Mercury Atoms Inside and Attached to a C60 Fullerene Cage

The solid state physics programme at ISOLDE: recent developments and perspectives

A compact digital time differential perturbed angular correlation-spectrometer using field programmable gate arrays and various timestamp algorithms

Contact Info

Product

Resources

About

Perturbed Angular Correlation Study of the Static and Dynamic Aspects of Cadmium and Mercury Atoms Inside and Attached to a C₆₀ Fullerene Cage

Perturbed Angular Correlation Study of the Static and Dynamic Aspects of Cadmium and Mercury Atoms Inside and Attached to a C₆₀ Fullerene Cage