| 1. |
- Borysiuk, Maciek, et al.
(author)
-
Hydrogen analysis and profiling with a position sensitive detector
- 2013
-
In: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - : Elsevier BV. - 0168-583X. ; 306, s. 49-53
-
Journal article (peer-reviewed)abstract
- The double sided silicon strip detector (DSSSD) is a segmented silicon detector commonly used in the fields of high energy physics and nuclear physics. This type of detector is used for analysis of reactions produced by charged particles. This makes it well suited for a number of analytical methods commonly used in ion beam analysis (IBA), such as Rutherford Backscattering (RBS) and elastic recoil detection (ERDA). One such detector was installed and tested at Lund Ion Beam Analysis Facility (LIBAF) recently. This is a modification to the existing setup used to measure hydrogen concentrations and depth profiles. When completed it will be used primarily for geological applications. Exact knowledge of the hydrogen content is important in a number of fields, but high enough accuracy can be difficult to achieve with most methods. In IBA normally some variant of ERDA, such as the proton-proton (p-p) coincidence method is used. We describe how the p-p coincidence technique was optimized to get the most out of our experimental setup. Previously this type of spectroscopy has been performed with two detector channels. In the present setup we expand that number from 2 to 96 channels, 64 on the front and 32 on the back of the detector. The intersecting strips give 2048 distinct detector elements or 1024 possible coincidences as dictated by the reaction kinematics. This increase in complexity requires a more detailed data analysis but it rewards us with higher sensitivity and a better background suppression. (C) 2013 Elsevier B.V. All rights reserved.
|
|
| 2. |
- Borysiuk, Maciek, et al.
(author)
-
Optimization of O-18 measurement using NRA for studies of isotopic content in fossil meteorites
- 2011
-
In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. - : Elsevier BV. - 0168-583X. ; 269:20, s. 2229-2232
-
Conference paper (peer-reviewed)abstract
- In this work, we discuss the possibility of a new approach to measuring oxygen isotope ratios in fossil meteorite samples, specifically one based on nuclear reaction analysis (NRA). Variations of oxygen ratios within meteoritic chromite grains can help to determine the type of meteorite to which the grains originally belonged. In this work, we have evaluated the possibility to use the reaction O-18(p, alpha)N-15 just above the 846 keV resonance to estimate the relative oxygen-18 content in a number of test samples. Another technique has to be employed for oxygen-16 measurements. A large area segmented silicon detector is used to detect the produced alpha particles. Results of the experimental O-18 measurements for a number of samples including four extraterrestrial chromite grains are presented and compared with SIMNRA simulations. The advantage of a segmented silicon detector in the form of inherent pile-up suppression can be clearly seen in the current work. (C) 2011 Elsevier B.V. All rights reserved.
|
|
| 3. |
- Golubev, Pavel, et al.
(author)
-
First results from the Lund NMP particle detector system
- 2009
-
In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. - : Elsevier BV. - 0168-583X. ; 267:12-13, s. 2065-2068
-
Conference paper (peer-reviewed)abstract
- The design and first results from a Double Sided Silicon Strip Detector (DSSSD) recently installed at the Lund Nuclear Microprobe facility (NMP) are presented. The detector has 64 sector strips and 32 ring strips, which in combination give more than 2000 detector cells, each with characteristics comparable with a standard surface barrier detector (SBD). The detector has been tested both with radioactive sources and with different ion beams and energies. The most striking features are the high rate virtually pile-up free operation and also the possibility of detailed measurement of angular distributions. (C) 2009 Elsevier B.V. All rights reserved.
|
|
| 4. |
- Ros, Linus, et al.
(author)
-
Measurement of hydrogen isotopes, D/H-ratio in thin samples
- 2013
-
In: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - : Elsevier BV. - 0168-583X. ; 306, s. 54-58
-
Journal article (peer-reviewed)abstract
- In this paper we present an investigation of to perform simultaneous measurements of the D/H-ratio by coincidence measurements using proton-proton scattering and proton-deuteron scattering or deuteron-deuteron scattering and deuteron-proton scattering. This is performed with the use of a double sided silicon strip detector (DSSSD), which provides both position information and energy information. The different approaches are evaluated by measurements on deuterated polyethylene targets with known D/H-ratios. Signals from both deuterium and hydrogen were observed during measurements and the best results were achieved with a beam of deuterons. (C) 2013 Elsevier B.V. All rights reserved.
|
|
