| 1. |
- Backlund, Y., et al.
(författare)
-
Micromachining of Silicon for Thermal and Position-Sensitive Nuclear-Detector Applications
- 1989
-
Ingår i: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. - : Elsevier BV. - 0168-9002. ; 279:3, s. 555-559
-
Tidskriftsartikel (refereegranskat)abstract
- As part of a programme aiming at the development of small nuclear radiation detectors, for example thermal detectors and position sensitive mosaic structures of surface barrier type, a technique for micromachining the detector bodies in silicon has been developed. The technique is based on an anisotropic etching property of a solution, mainly consisting of KOH. The etch rate is strongly orientation dependent with a speed in the 〈100〉 direction about 400 times faster than in the 〈111〉 direction. The major steps in the etching procedure are described and some examples of deep etching in Si are shown.
|
|
| 2. |
- Cederkäll, Joakim, et al.
(författare)
-
REX-ISOLDE - experiences from the first year of operation
- 2004
-
Ingår i: Nuclear Physics A. - : Elsevier BV. - 0375-9474. ; 746, s. 17-17
-
Konferensbidrag (refereegranskat)abstract
- The Radioactive beam EXperiment (REX) at CERN-ISOLDE has been commissioned and the first experiments successfully completed during 2002 and 2003. The concept used for post-acceleration has proven to be flexible and the experimental program has therefore been extended during the past year. This paper relays some experiences drawn from using the machine in the current program and also conveys some plans for the future.
|
|
| 3. |
- Kester, O., et al.
(författare)
-
Accelerated radioactive beams from REX-ISOLDE
- 2003
-
Ingår i: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 204, s. 20-20
-
Konferensbidrag (refereegranskat)abstract
- In 2001 the linear accelerator of the Radioactive beam EXperiment (REX-ISOLDE) delivered for the first time accelerated radioactive ion beams, at a beam energy of 2 MeV/u. REX-ISOLDE uses the method of charge-state breeding, in order to enhance the charge state of the ions before injection into the LINAC. Radioactive singly-charged ions from the on-line mass separator ISOLDE are first accumulated in a Penning trap, then charge bred to an A/q
|
|
| 4. |
- Lindroos, Mats, 1961
(författare)
-
Decay Properties and Hyperfine Interactions in Oriented Alpha-, Beta- and Gamma-emitting Nuclei
- 1993
-
Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The hyperfine interaction has often been described as the bridge between atomic physics and nuclear physics. On the one hand it enables us to study important nuclear phenomena which only manifest themselves in the strong internal fields originating from the surrounding electrons and on the other hand it enables us to study properties of the atomic system or of condensed matter using nuclear probes. In this work I will present three different experiments which all have in common that the hyperfine interaction is central for the technique. The issue of lattice sites of francium in iron has been studied with two different techniques, integral Low Temperature Nuclear Orientation (LTNO) and emission channelling. Monte Carlo simulations of the system fitted to the channelling spectra reveal a large fraction of Francium in substitutional sites and hint at a possible complex site distribution. Using a two site model for the LTNO data, a large fraction in high field site, in agreement with the channelling data, is deduced. Furthermore, in parallel to the gamma- and alpha anisotropy measurement on 221Fr, alpha-anisotropy measurements have been performed on 225Ac, 217At and 209Po. Preliminary emission channelling data is also reported for 217At and 209Po. The magnetic dipole moment of the 127,129Sb and 212,213Bi ground states have been measured and compared to results of shell model calculations. The technique of Nuclear Magnetic Resonance on Oriented Nuclei (NMR/ON) has been utilised to measure the magnetic dipole moments of the 127,129Sb ground states and the technique of integral LTNO to measure the moments of the 212,213Bi ground states. Comparison between the shell model particle-core coupling calculations and the measured values hints at a possible systematically very small collective g-factor in these regions. In parallel to the NMR/ON study an integral LTNO experiment was performed on the excited states in 127,129Te. To reach further out from the valley of stability on the chart of nuclides, alternative methods to LTNO for polarisation have to be applied. One such method is the method of Tilted-Foil Polarisation (TFP). Two different studies have been performed aiming to develop the TFP technique for the measurement of ground-state properties of short- lived nuclei. The primary ion-beam from the ISOLDE facility, CERN, was post accelerated to 520 keV with a High Voltage platform to penetrate the tilted foils. Evidence for asymmetry induced by TFP was observed in the shape of a de-coupling curve between the holding field and the internal defect induced quadrupole interaction.
|
|
| 5. |
|
|
| 6. |
- Santoro, V., et al.
(författare)
-
HighNESS conceptual design report: Volume II. the NNBAR experiment.
- 2024
-
Ingår i: Journal of Neutron Research. - 1023-8166 .- 1477-2655. ; 25:3-4, s. 315-406
-
Tidskriftsartikel (refereegranskat)abstract
- A key aim of the HighNESS project for the European Spallation Source is to enable cutting-edge particle physics experiments. This volume presents a conceptual design report for the NNBAR experiment. NNBAR would exploit a new cold lower moderator to make the first search in over thirty years for free neutrons converting to anti-neutrons. The observation of such a baryon-number-violating signature would be of fundamental significance and tackle open questions in modern physics, including the origin of the matter-antimatter asymmetry. This report shows the design of the beamline, supermirror focusing system, magnetic and radiation shielding, and anti-neutron detector necessary for the experiment. A range of simulation programs are employed to quantify the performance of the experiment and show how background can be suppressed. For a search with full background suppression, a sensitivity improvement of three orders of magnitude is expected, as compared with the previous search. Civil engineering studies for the NNBAR beamline are also shown, as is a costing model for the experiment.
|
|
