Precise measurements of the lifetimes of the first excited 2+ states in the stable even-A Sn isotopes 112–124Sn have been performed using the Doppler shift attenuation technique. For the isotopes ...112Sn, 114Sn and 116Sn the E2 transition strengths deduced from the measured lifetimes are in disagreement with the previously reported values and indicate a shallow minimum at N=66. The observed deviation from a maximum at mid-shell is attributed to the obstructive effect of the s1/2 neutron orbital in generating collectivity when near the Fermi level.
For the fabrication of ultra cold neutron detectors a new deposition plant was purchased and assembled in 2006. It was recently decided to equip the system with a more versatile deposition setup and ...complement the already existing 7-hearth electron gun with 4 sputter guns and an ion gun. In addition, the entire vacuum system has been automated to facilitate its operation end exclude handling errors. Additionally it is planned to automate the deposition process to render the fabrication of extremely multilayered (several hundred layers) systems possible.
First testing of the CALIFA Barrel Demonstrator Pietras, B.; Winkel, M.; Alvarez-Pol, H. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
04/2016, Letnik:
814
Journal Article
Recenzirano
Odprti dostop
Advancement of the CALIFA calorimeter project has reached a new milestone with the construction of the first modules of the CALIFA Demonstrator, ultimately to be integrated into the final ...calorimeter. Aspects and methods of detector optimisation will be discussed, along with characterisation using proton beams of 70<Ekin<230MeV at the Bronowice Cyclotron Centre (CCB) in Krakow, Poland. Features such as the support structure, crystal geometry and digital electronics represent the final versions to be employed, enabling a full test of each component׳s performance. A study of caesium iodide quenching over the available proton energy range has been performed, to accompany a method for proton calibration scaled from the measured gamma-ray energies.
AGATA belongs to a new generation of
γ
-ray detector arrays for nuclear spectroscopy at present in its final stage of development. The detectors of these new arrays will be based on 36-fold ...electronically segmented coaxial germanium diodes operated in position sensitive mode.
An in-beam test of the AGATA prototype triple cluster detector was carried out with the purpose of demonstrating the feasibility of such detectors and in order to measure the most sensitive parameters for their overall performance. An inverse kinematics reaction was performed, using a
48
Ti
beam at an energy of 100
MeV, impinging on a deuterated titanium target. The results from the analysis of the experimental data, compared with the predictions of Monte Carlo simulations, give an estimation of the position sensitivity of these detectors of about 5
mm FWHM, consistent with the specifications required.
CALIFA Barrel prototype detector characterisation Pietras, B.; Gascón, M.; Álvarez-Pol, H. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/2013, Letnik:
729
Journal Article
Recenzirano
Well established in the field of scintillator detection, Caesium Iodide remains at the forefront of scintillators for use in modern calorimeters. Recent developments in photosensor technology have ...lead to the production of Large Area Avalanche Photo Diodes (LAAPDs), a huge advancement on traditional photosensors in terms of high internal gain, dynamic range, magnetic field insensitivity, high quantum efficiency and fast recovery time. The R3B physics programme has a number of requirements for its calorimeter, one of the most challenging being the dual functionality as both a calorimeter and a spectrometer. This involves the simultaneous detection of ∼300MeV protons and gamma rays ranging from 0.1 to 20MeV. This scintillator – photosensor coupling provides an excellent solution in this capacity, in part due to the near perfect match of the LAAPD quantum efficiency peak to the light output wavelength of CsI(Tl). Modern detector development is guided by use of Monte Carlo simulations to predict detector performance, nonetheless it is essential to benchmark these simulations against real data taken with prototype detector arrays. Here follows an account of the performance of two such prototypes representing different polar regions of the Barrel section of the forthcoming CALIFA calorimeter. Measurements were taken for gamma–ray energies up to 15.1MeV (Maier-Leibnitz Laboratory, Garching, Germany) and for direct irradiation with a 180MeV proton beam (The Svedberg Laboratoriet, Uppsala, Sweden). Results are discussed in light of complementary GEANT4 simulations.
•Prototypes corresponding to different sections of the forthcoming CALIFA Barrel calorimeter were tested.•The response to both high energy gamma rays and high energy protons was observed.•This response was reproduced by use of R3BROOT simulations, the geometry extrapolated to predict performance of the complete calorimeter.•Effects such as energy straggling of wrapping material and light cross-talk were additionally measured experimentally and investigated by use of simulations.
The method of pulse-shape analysis (PSA) for particle identification (PID) was applied to a double-sided silicon strip detector (DSSD) with a strip pitch of
300
μ
m
. We present the results of test ...measurements with particles from the reactions of a 70
MeV
12C beam impinging on a mylar target. Good separation between protons and alpha particles down to 3
MeV has been obtained when excluding the interstrip events of the DSSD from the analysis.
4D Tomography for neutron depth profiling applications Neagu, R.; Golenev, S.; Werner, L. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
August 2024, 2024-08-00, Letnik:
1065
Journal Article
Recenzirano
Odprti dostop
High-rate Neutron Depth Profiling (NDP) is a very efficient and precise probe for studying the evolution of lithium concentration in thin-layer structures, e.g., battery electrodes. NDP is typically ...limited to a one-dimensional depth analysis summed over the profile area covered by the neutron beam. We developed a detector system based on double-sided silicon strip detectors (DSSSD) with extremely thin and homogeneous entrance windows to provide a new quality of NDP measurements in 3+1 dimensions for the N4DP instrument at the FRM II in Garching, Germany. Using the 6Li(n, α)3H reaction in an experiment conducted at the research reactor in Delft, we achieved a lateral position resolution down to ∼100μm and an energy resolution with FWHM≈10keV for the triton particles at energies of 2.7MeV. High-resolution 3D pictures with a contrast uncertainty <10% per pixel can be achieved faster than 1 picture per minute. This rate can be adjusted individually for each experiment by sacrificing granularity in the position measurement.
HI-TREX—A highly integrated transfer setup at REX-(HIE)ISOLDE Berner, C.; Werner, L.; Gernhäuser, R. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
01/2021, Letnik:
987
Journal Article
Recenzirano
Transfer reactions are a unique tool to populate and probe the structure of nuclei. Due to its unprecedented capabilities in producing and accelerating exotic nuclei, the HIE-ISOLDE facility at CERN ...provides an excellent opportunity for transfer experiments using radioactive ion beams. We present the concept, layout and prototype measurements with the newly developed HI-TREX particle detection setup, optimized for an efficacious investigation of transfer reactions. A special focus is put on the electronics developments utilizing the custom made, FPGA based GEAR platform for reading the data from the SKIROC2 ASICs. We present performance measurements of the readout and show results from a heavy-ion beam experiment at the Munich tandem accelerator facility MLL.
The cold neutron guide of the Prompt Gamma Activation Analysis (PGAA) instrument (Revay et al. 2015) at the Heinz Maier-Leibnitz Zentrum (MLZ) provides an excellent opportunity for neutron depth ...profiling (NDP) due to its high collimated neutron flux. We present the concept, layout and first measurements with the new N4DP facility set-up at this beamline. A special focus is put on background analysis and instrument characterization. We present measurements of a NIST reference sample and of boron-containing float glasses which are used for neutron optical waveguides. We give an outlook concerning the ongoing development of position-resolved NDP using silicon microstrip detectors.
The cluster-knockout reaction project, ONOKORO, has been launched to elucidate the formation mechanism of clusters in atomic nuclei. For the inverse-kinetics cluster-knockout reaction experiments, a ...new detector array is under development to measure energies and angles of light ions emitted in the reactions. The silicon tracker tracks the particles with good angular and energy-loss resolutions. A performance test of the silicon strip detectors with a thickness of 100μm and a strip width of 100μm was performed using prototype silicon detectors. The mono-energetic proton and α-particle beams were irradiated on the silicon detectors. The energy-loss spectra in silicon detectors showed a good signal-to-noise ratio. The threshold level for signal detection is seven sigma of noise level. Their dynamic ranges were optimized wide enough to detect charge number Z= 1 and Z= 2 ions emitted in the cluster-knockout reactions.
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