A Novel Modular Ring Imaging Cherenkov (mRICH) Detector for the Experiments in the Electron-Ion Collider (#1261)
C. - P. Wong1
1 Georgia State University, Physics and Astronomy, Atlanta, Georgia, United States of America
In the proposed Electron-Ion Collider (EIC) experiments, particle identification (PID) of the final state hadrons in the semi-inclusive deep inelastic scattering allows the measurement of flavor-dependent gluon and quarks distributions inside nucleons and nuclei. An EIC PID consortium (eRD14 Collaboration) has been formed for identifying and developing PID detectors using the Ring Imaging Cherenkov (RICH) technique for the EIC experiments. A modular Ring Imaging Cherenkov (mRICH) detector has been designed for particle identification in the momentum coverage from 3 GeV/c to 10 GeV/c. The first prototype of this detector was successfully tested at Fermi National Accelerator Laboratory in April 2016 for verifying the detector working principles. The mRICH detector consists of an aerogel radiator block, a Fresnel lens, a mirror-wall and a photosensor plane. The use of a Fresnel lens results in a sharper Cherenkov ring image and yields a lower uncertainty of single photon measurement. This talk will highlight the mRICH beam test results and the comparison with the results from a Geant4-based detector simulation. A newer prototype design will also be included in this presentation.
Keywords: aerogel, RICH, Cherenkov detector, EIC, particle identification
A study of scintillation efficiency and pulse shape parameter in neutron-argon scattering with the ARIS experiment (#3800)
E. Pantic1, T. N. Jonhson1, P. Agnes2, D. Franco2, Q. Riffard2, C. J. Martoff3, A. W. Watson3, H. Wang4, Y. Wang4, A. Fan4, B. Schlitzer1, C. Giganti5, S. De Cecco5, G. Fiorillo6, B. Rossi6, C. Galbiati7, G. Korga8, A. Renshaw8, A. Tonazzo2, A. Navrer-Agasson5, M. Lebois9, Q. Liqiang9, J. Wilson9, A. Mandarano10, A. Razeto10
1 University of California Davis, Physics, Davis, California, United States of America
(on behalf of ARIS collaboration)
Large liquid argon-based detectors have a unique property among direct dark matter detection technologies of rejecting common radioactive backgrounds by utilizing the scintillation pulse shape. This rejection requires a full understanding of the light yield, charge yield, and scintillation pulse shape for both signal events, modeled by neutron interactions in argon, and background events. The Argon Response Ionization and Scintillation (ARIS) collaboration measured the scintillation light yield and pulse shape parameter of nuclear recoils in argon by subjecting a liquid argon time projection chamber to a beam of neutrons with known energy. We successfully performed a high statistics scan of relevant nuclear recoil energies and electric fields, providing a characterization of signal-like interactions in a liquid argon target in the low energy regime. The present status of the analysis will be presented.
Keywords: liquid argon, light yield, pulse shape, neutron
Extra-Large Silicon Drift Detector (SDD) for scintillator readout system in Rare Event experiment (#3036)
F. Fuschino1, 2, C. Labanti1, 2, R. Campana1, 2, G. Baldazzi3, 2, L. P. Rignanese3, 2, Y. Evangelista4, 5, M. Feroci4, 5, A. G. Vacchi7, 6, A. Rashevsky6, G. Zampa6, N. Zampa6, I. Rashevskaya8, 6, P. Bellutti9, C. Piemonte9, G. Bertuccio10, M. Gandola10, P. Malcovati11, L. Gironi12, 13, M. Sisti12, 13, E. Previtali12, 13, S. Capelli12, 13, M. Beretta12, 13
1 INAF, IASF-Bo, Bologna, Italy
Innovative projects for the rare event searches, such as the neutrinoless double beta decay, require detectors with a 2-3% FWHM level energy resolution in the MeV band. The attempt of this project is to combine scintillating crystals including double beta-decay nuclides with high performing low noise silicon drift detectors (SDDs). To increase the light output of the selected crystals (i.e. CaMoO4, CdWO4,) the system has to be operated at about 120 K; to increase the probability of event detection a large volume system is required. The proposed technique will combine in a single device all the demanding features needed by an ideal experiment looking for rare events, such as relatively simple low cost, mass scalability and powerful background reduction techniques.
For these purposes, in the framework of the ReDSoX Italian collaboration, we developed a custom single cell SDD with an effective area of 900 mm2 to be coupled with 3x3x3 cm3 scintillator crystals.
In this paper we present the laboratory characterization of the first SDD prototype integrated with a ultra low-noise charge sensitive preamplifiers operated in a Liquid Nitrogen cryostat. We discuss the characterization of the scintillator performances taking into account the optical properties of the SDD.
Keywords: Silicon Drift Detector (SDD), scintillator crystals, Rare Event Search
The Neutron Induced Fission Fragment Tracking Experiment: Cross Section Measurement Results from the Fission Time Projection Chamber (#3253)
N. I. Walsh1
1 Lawrence Livermore National Laboratory, Livermore, California, United States of America
On behalf of the NIFFTE Collaboration
The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) has developed a fission Time Projection Chamber (fissionTPC) for the purpose of precisely measuring fission cross sections. The fissionTPC consists of two gas-filled drift chambers each instrumented with a MICRO-MEsh Gaseous Structure (MICROMEGAS) and almost 3000 conductive pads. To make a precise cross section measurement we take advantage of the fissionTPC's advanced particle identification and tracking. For example, we measure the neutron beam profile and the actinide target uniformity in-situ. In addition, this tracking capability has enabled us to build a detector efficiency model to account for energy loss of fission fragments in the target as a function of target properties and fragment kinematics. Measurements for the U-238 and Pu-239 neutron induced fission cross sections were made recently with data taken at the Los Alamos Neutron Science Center (LANSCE). We will report on the systematic uncertainties of the fissionTPC and our latest fission cross section measurement results.
Keywords: Nuclear physics, nuclear instrumentation
A SiPM-based Detection Module for 1” and 2” LaBr3:Ce Readout for Nuclear Physics Applications (#1990)
G. Cozzi1, 2, L. Buonanno1, P. Busca1, 7, M. Carminati1, 2, C. Fiorini1, 2, G. L. Montagnani1, 2, F. Acerbi3, 4, A. Gola3, 4, G. Paternoster3, 4, C. Piemonte3, 4, V. Regazzoni3, 5, N. Blasi2, F. Camera2, 6, B. Million2
1 Politecnico di Milano, Dipartimento di Elettronica Informazione e Bioingegneria, Milan, Italy
We present a temperature-stabilized SiPM-based gamma-ray detection module, which allows to read large LaBr3:Ce crystals (> 1”), typically adopted in nuclear physics experiments, with the same spectroscopic performances achievable with gold standard PMTs (3 % at 662 keV). High-Density SiPM technology for Near UltraViolet and blue light detection (NUV-HD, Fondazione Bruno Kessler, Italy) were used. These SiPMs show high Photo Detection Efficiency (peak PDE = 45 % at 380 nm) and low Dark Count Rate (DCR < 100 kHz/mm2). The detector prototype has a modular structure based on an array of 5 × 6 SiPMs, each one having an active area of 6 × 6 mm2 and 30 μm microcells. This array is used for 1” scintillator readout and it is foreseen as basic unit for the assembly of larger arrays to read 2” and 3’’ scintillators. Spectroscopic measurements were performed with 1” × 1” and 2” × 2” LaBr3:Ce with 57Co, 133Ba, 137Cs and 60Co calibration sources. An energy resolution of 3.19 ± 0.01 % was achieved at 662 keV with 2” LaBr3:Ce. The same crystal was tested with a PMT showing an energy resolution of 3.07 ± 0.03 % at 662 keV. These results are the closest to PMT standards for large LaBr3:Ce readout at our knowledge and suggest that SiPM technology is currently suitable to be coupled to large, high-resolution scintillators.
Keywords: Nuclear Physics, Cerium doped Lanthanium Bromide (LaBr3:Ce), Gamma-ray Spectroscopy, Silicon PhotoMultiplier (SiPM), PhotoMultiplier Tube (PMT)
Design and Tests of a Detector for 222Rn in Soil-gas Measurements based on 222Rn Absorbing Scintillating Polymers (#2511)
K. K. Mitev1, L. T. Tsankov1, M. G. Mitev2, C. C. H. Dutsov1, S. B. Georgiev1, S. Kolev1, N. Markov3, T. Todorov1
1 Sofia University, Faculty of Physics, Sofia, Bulgaria
This work presents the development and first tests of a detector for continuous 222Rn in soil-gas measurements. It is based on scintillation spectrometry of 222Rn absorbed in scintillating polymers –plastic scintillator foils or plastic scintillation microspheres. The detector consists of an optical chamber optically coupled to a hermetic volume which contains a photomultiplier tube (Hamamatsu R7600U-200), high voltage supply (Hamamatsu C4900-51), multi-channel analyzer (labZY nanoMCA-SP) and an outside board with sensors for pressure, temperature, humidity and an accelerometer. The detector is compact, portable and is designed for 222Rn in soil-gas measurements in boreholes. Pilot laboratory studies of the performance of the detector are presented. They include: pulse-height spectrum characterization and energy resolution study with 239Pu source; counting efficiency study and study of the pulse-height spectrum of a plastic scintillator with 222Rn absorbed in it. The performance of the detector in the laboratory tests indicates that the approach to build a portable scintillation counter for 222Rn in soil-gas measurements in boreholes is feasible.
Keywords: Radon in soil-gas, plastic scintilaltors, countinous monitoring