358 results on '"Pulse shape analysis"'
Search Results
2. Pulse shape discrimination of CLYC, CLLBC and EJ-276 with SiPM readout.
- Author
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Seitz, Bjoern, Bennett, David, and Thomson, Frank
- Subjects
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NEUTRONS , *SOLID state detectors , *GAMMA rays , *SCINTILLATION counters , *ALGORITHMS - Abstract
Solid state detectors for the detection of thermal and fast neutrons find widespread applications. They often operate in a high gamma-radiation field or are required to discriminate between gamma-radiation and neutrons. Organic and in-organic scintillation materials are proposed as detector materials. These materials often exhibit different pulse shapes in their light output, which allows a variety of pulse shape analysis (PSA) techniques to be used to distinguish the two species of radiation. The current maturity of silicon based single photon counters (SiPM) provides a viable visible photon detector alternative to conventional vacuum based photo multiplier tubes (PMT). However, their impact on PSA has not been deeply studied. Three solid state scintillation materials, CLYC, CLLBC and EJ-276 are coupled to an array of SiPM and exposed to neutron and gamma radiation. Their response is characterized using a variety of PSA algorithms and quantified in a Figure of Merit. Conventional charge comparison algorithms perform well for all materials, while a Fourier component analysis shows particular strength for the in-organic materials tested. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
3. Brain blood flow pulse analysis may help to recognize individuals who suffer from hydrocephalus.
- Author
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Ziółkowski, Arkadiusz, Kasprowicz, Magdalena, Czosnyka, Marek, and Czosnyka, Zofia
- Subjects
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BLOOD flow , *TRANSCRANIAL Doppler ultrasonography , *CEREBRAL circulation , *RECEIVER operating characteristic curves , *HYDROCEPHALUS - Abstract
Background: Normal pressure hydrocephalus (NPH) is often associated with altered cerebral blood flow. Recent research with the use of the ultrasonic method suggests specific changes in the shape of cardiac-related cerebral arterial blood volume (CaBV) pulses in NPH patients. Our study aims to provide a quantitative analysis of the shape of CaBV pulses, estimated based on transcranial Doppler ultrasonography (TCD) in NPH patients and healthy individuals. Methods: The CaBV pulses were estimated using TCD cerebral blood flow velocity signals recorded from probable NPH adults and age-matched healthy individuals at rest. The shape of the CaBV pulses was compared to a triangular shape with 27 similarity parameters calculated for every reliable CaBV pulse and compared between patients and volunteers. The diagnostic accuracy of the most prominent parameter for NPH classification was evaluated using the area under the receiver operating characteristic curve (AUC). Results: The similarity parameters were calculated for 31 probable NPH patients (age: 59 years (IQR: 47, 67 years), 14 females) and 23 healthy volunteers (age: 54 years (IQR: 43, 61 years), 18 females). Eighteen of 27 parameters were different between healthy individuals and NPH patients (p < 0.05). The most prominent differences were found for the ascending slope of the CaBV pulse with the AUC equal to 0.87 (95% confidence interval: 0.77, 0.97, p < 0.001). Conclusions: The findings suggest that in NPH, the ascending slope of the CaBV pulse had a slower rise, was more like a straight line, and generally was less convex than in volunteers. Prospective research is required to verify the clinical utility of these findings. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
4. Quantitative analysis of similarity between cerebral arterial blood volume and intracranial pressure pulse waveforms during intracranial pressure plateau waves
- Author
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Arkadiusz Ziółkowski, Magdalena Kasprowicz, Agnieszka Kazimierska, and Marek Czosnyka
- Subjects
Intracranial pressure ,Cerebral blood flow velocity ,Transcranial Doppler ,Morphological analysis ,Pulse shape analysis ,Brain blood circulation ,Neurology. Diseases of the nervous system ,RC346-429 - Abstract
Introduction: Both intracranial pressure (ICP) and cerebral arterial blood volume (CaBV) have a pulsatile character related to the cardiac cycle. The evolution of the shape of ICP pulses under increasing ICP or decreasing intracranial compliance is well documented. Nevertheless, the exact origin of the alterations in the ICP morphology remains unclear. Research question: Does ICP pulse waveform become similar to non-invasively estimated CaBV pulse during ICP plateau waves. Material and methods: A total of 15 plateau waves recorded in 15 traumatic brain injured patients were analyzed. CaBV pulse waveforms were calculated using global cerebral blood flow model from transcranial Doppler cerebral blood flow velocity (CBFV) signals. The difference index (DI) was used to quantify the similarity between ICP and CaBV waveforms. DI was calculated as the sum of absolute sample-by-sample differences between ICP and CaBV waveforms, representing the area between the pulses. Results: ICP increased (19.4 mm Hg [Q1–Q3: 18.2–23.4 mm Hg] vs. 42.7 mm Hg [Q1–Q3: 36.5–45.1 mm Hg], p
- Published
- 2024
- Full Text
- View/download PDF
5. Development of a High Sampling Rate Data Acquisition System Working in a High Pulse Count Rate Region for Radiation Diagnostics in Nuclear Fusion Plasma Research.
- Author
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Ogawa, Kunihiro, Sangaroon, Siriyaporn, Liao, Long Yong, Takada, Eiji, and Isobe, Mitsutaka
- Subjects
DATA acquisition systems ,PLASMA diagnostics ,NUCLEAR fusion ,PLASMA confinement devices ,NUCLEAR energy ,MAGNETIC confinement ,TRANSCRANIAL magnetic stimulation - Abstract
In this study, a high sampling rate data acquisition system with the ability to provide timestamp, pulse shape information, and waveform simultaneously under a sub megahertz pulse counting rate was developed for radiation diagnostics for magnetic confinement nuclear fusion plasma research. The testing of the data acquisition system under the high pulse counting rate condition using real signals was performed in an accelerator-based deuterium-deuterium fusion neutron source (Fast Neutron Source) at the Japan Atomic Energy Agency. We found that the pulse counts acquired by the system linearly increased up to 6 × 10
5 cps, and the count loss at 106 cps was estimated to be ~10%. The data acquisition system was applied to deuterium-deuterium neutron profile diagnostics in the deuterium gas operation of a helical-type magnetic confinement plasma device, called the Large Helical Device, to observe the radial profile of neutron emissivity for the first time in a three-dimensional magnetic confinement fusion device. Time-resolved measurements of the deuterium-deuterium fusion emission profile were performed. The experimentally observed radial neutron emission profile was consistent with numerical predictions based on the orbit-following models using experimental data. The data acquisition system was shown to have the desired performance. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
6. Peak appearance time in pulse waveforms of intracranial pressure and cerebral blood flow velocity.
- Author
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Ziółkowski, Arkadiusz, Pudełko, Agata, Kazimierska, Agnieszka, Uryga, Agnieszka, Czosnyka, Zofia, Kasprowicz, Magdalena, and Czosnyka, Marek
- Subjects
CEREBRAL circulation ,INTRACRANIAL pressure ,FLOW velocity ,BLOOD pressure ,BRAIN injuries - Abstract
The shape of the pulse waveforms of intracranial pressure (ICP) and cerebral blood flow velocity (CBFV) typically contains three characteristic peaks. It was reported that alterations in cerebral hemodynamics may influence the shape of the pulse waveforms by changing peaks' configuration. However, the changes in peak appearance time (PAT) in ICP and CBFV pulses are only described superficially. We analyzed retrospectively ICP and CBFV signals recorded in traumatic brain injury patients during decrease in ICP induced by hypocapnia (n = 11) and rise in ICP during episodes of ICP plateau waves (n = 8). All three peaks were manually annotated in over 48 thousand individual pulses. The changes in PAT were compared between periods of vasoconstriction (expected during hypocapnia) and vasodilation (expected during ICP plateau waves) and their corresponding baselines. Correlation coefficient (r
S ) analysis between mean ICP and mean PATs was performed in each individual recording. Vasodilation prolonged PAT of the first peaks of ICP and CBFV pulses and the third peak of CBFV pulse. It also accelerated PAT of the third peak of ICP pulse. In contrast, vasoconstriction shortened appearance time of the first peaks of ICP and CBFV pulses and the second peak of ICP pulses. Analysis of individual recordings demonstrated positive association between changes in PAT of all three peaks in the CBFV pulse and mean ICP (rS range: 0.32--0.79 for significant correlations). Further study is needed to test whether PAT of the CBFV pulse may serve as an indicator of changes in ICP--this may open a perspective for non-invasive monitoring of alterations in mean ICP. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
7. Peak appearance time in pulse waveforms of intracranial pressure and cerebral blood flow velocity
- Author
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Arkadiusz Ziółkowski, Agata Pudełko, Agnieszka Kazimierska, Agnieszka Uryga, Zofia Czosnyka, Magdalena Kasprowicz, and Marek Czosnyka
- Subjects
transcranial Doppler ,cerebral blood flow velocity ,morphological analysis ,pulse shape analysis ,traumatic brain injury ,intracranial pressure ,Physiology ,QP1-981 - Abstract
The shape of the pulse waveforms of intracranial pressure (ICP) and cerebral blood flow velocity (CBFV) typically contains three characteristic peaks. It was reported that alterations in cerebral hemodynamics may influence the shape of the pulse waveforms by changing peaks’ configuration. However, the changes in peak appearance time (PAT) in ICP and CBFV pulses are only described superficially. We analyzed retrospectively ICP and CBFV signals recorded in traumatic brain injury patients during decrease in ICP induced by hypocapnia (n = 11) and rise in ICP during episodes of ICP plateau waves (n = 8). All three peaks were manually annotated in over 48 thousand individual pulses. The changes in PAT were compared between periods of vasoconstriction (expected during hypocapnia) and vasodilation (expected during ICP plateau waves) and their corresponding baselines. Correlation coefficient (rS) analysis between mean ICP and mean PATs was performed in each individual recording. Vasodilation prolonged PAT of the first peaks of ICP and CBFV pulses and the third peak of CBFV pulse. It also accelerated PAT of the third peak of ICP pulse. In contrast, vasoconstriction shortened appearance time of the first peaks of ICP and CBFV pulses and the second peak of ICP pulses. Analysis of individual recordings demonstrated positive association between changes in PAT of all three peaks in the CBFV pulse and mean ICP (rS range: 0.32–0.79 for significant correlations). Further study is needed to test whether PAT of the CBFV pulse may serve as an indicator of changes in ICP–this may open a perspective for non-invasive monitoring of alterations in mean ICP.
- Published
- 2023
- Full Text
- View/download PDF
8. Anomalous X-ray pulse responses in MAPbBr3 single crystal-based detectors.
- Author
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Park, Beomjun, Ko, Juyoung, Byun, Jangwon, Pandey, Sandeep, and Lee, Man-Jong
- Subjects
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DETECTORS , *X-ray imaging , *X-rays , *CHARGE carriers , *SINGLE crystals , *CARRIER density - Abstract
Organic-inorganic perovskite single crystals (SCs) are considered promising semiconductors for high-sensitivity X-ray detectors because of their strong X-ray interaction, low-temperature processability, and excellent properties such as long diffusion length, low defect density, and long carrier lifetime. However, the specific pulse response of MAPbBr 3 SC-based X-ray detectors frequently exhibits a tail and over/undershoots at several conditions, which degrades the X-ray image quality; however, no detailed analysis of these characteristics has been reported thus far. For high-resolution X-ray imaging, it is necessary to obtain an ideal pulse response that is free of tails and over/undershoots. In this study, we investigated the specific X-ray responses of solution-grown MAPbBr 3 SC-based X-ray detectors under various externally applied voltages. Based on the study on charge carrier dynamics, we analyzed the origin of the tail and over/undershoots in X-ray pulse response shapes. We theoretically verified that the unideal pulse response in perovskite SC-based X-ray detectors is attributed to the defect states inherent in perovskite SCs. • X-ray responses of MAPbBr 3 single-crystal detectors with different electrodes are investigated. • The specific pulse responses of the detectors show tail and over/undershoots. • Tail and overshoots can be interpreted as de-trapping and trapping, respectively, on shallow traps. • Undershoot is caused by diffusion currents due to the internal fields and unoccupied vacancies. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
9. Scanning of a Double-Sided Germanium Strip Detector.
- Author
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Sharma, Arzoo, Palit, R., Kojouharov, I., Gerl, J., Gorska-Ott, M., Schaffner, H., Habermann, T., Saha, S., Das, Biswajit, Dey, P., Donthi, R., Naidu, B.S., Mandal, S., and Singh, Pushpendra P.
- Subjects
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SCANNING systems , *DETECTORS , *GAMMA rays , *ANNIHILATION reactions , *IONS - Abstract
This work presents the results from the characterization of a Position-Sensitive Planar Germanium (PSPGe) detector. The PSPGe detector is a double-sided orthogonal strip detector consisting of 10x10 electrical segmentation along the horizontal and vertical directions. The characterization was performed using the coincidence setup between the PSPGe detector and the well-characterized scanning system employing the positron annihilation correlation principle. The scanning system consists of a Position Sensitive Detector (PSD) and 22Na positron source. The main objective of this study is to deploy PSPGe detector for future decay experiments at the Facility for Antiproton and Ion Research (FAIR), Germany. The measurements have been performed to find the depth of gamma-ray interaction in the planar segmented detector. The 2-Dimensional image obtained from the PSD has been used to find the depth of gamma-ray interaction in the planar strip detector using pulse shape analysis. In addition, the sensitivity of PSPGe detector has been investigated by calculating the rise-time from pulse shapes for the front and back strips of the detector. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
10. Quantitative analysis of similarity between cerebral arterial blood volume and intracranial pressure pulse waveforms during intracranial pressure plateau waves.
- Author
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Ziółkowski A, Kasprowicz M, Kazimierska A, and Czosnyka M
- Abstract
Introduction: Both intracranial pressure (ICP) and cerebral arterial blood volume (C
a BV) have a pulsatile character related to the cardiac cycle. The evolution of the shape of ICP pulses under increasing ICP or decreasing intracranial compliance is well documented. Nevertheless, the exact origin of the alterations in the ICP morphology remains unclear., Research Question: Does ICP pulse waveform become similar to non-invasively estimated Ca BV pulse during ICP plateau waves., Material and Methods: A total of 15 plateau waves recorded in 15 traumatic brain injured patients were analyzed. Ca BV pulse waveforms were calculated using global cerebral blood flow model from transcranial Doppler cerebral blood flow velocity (CBFV) signals. The difference index (DI) was used to quantify the similarity between ICP and Ca BV waveforms. DI was calculated as the sum of absolute sample-by-sample differences between ICP and Ca BV waveforms, representing the area between the pulses., Results: ICP increased (19.4 mm Hg [Q1-Q3: 18.2-23.4 mm Hg] vs. 42.7 mm Hg [Q1-Q3: 36.5-45.1 mm Hg], p < 0.001) while CBFV decreased (44.2 cm/s [Q1-Q3: 34.8-69.5 cm/s] vs. 32.9 cm/s [Q1-Q3: 24.7-68.2 cm/s], p = 0.002) during plateau waves. DI was smaller during the plateau waves (20.4 [Q1-Q3: 15.74-23.0]) compared to the baselines (26.3 [Q1-Q3: 24.2-34.7], p < 0.001)., Discussion and Conclusion: The area between corresponding ICP and Ca BV pulse waveforms decreased during the plateau waves which suggests they became similar in shape. Ca BV may play a significant role in determining the shape of ICP pulses during the plateau waves and might be a driving force in formulating ICP elevation., Competing Interests: The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Arkadiusz Ziolkowski reports financial support was provided by National Science Centre Poland. Magdalena Kasprowicz reports financial support was provided by National Science Centre Poland. Agnieszka Kazimierska reports financial support was provided by National Science Centre Poland. Marek Czosnyka reports financial support was provided by European Regional Development Fund. Marek Czosnyka reports support was provided by National Institute for Health and Care Research , Cambridge. Marek Czosnyka has patent licensed to Part of the licensing fee of ICM + software., (© 2024 The Authors.)- Published
- 2024
- Full Text
- View/download PDF
11. Effect of large-angle incidence on particle identification performance for light-charged ([formula omitted]) particles by pulse shape analysis with a pad-type nTD silicon detector.
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Kawase, Shoichiro, Murota, Takuya, Fukuda, Hiroya, Oishi, Masaya, Kawata, Teppei, Kitafuji, Kentaro, Manabe, Seiya, Watanabe, Yukinobu, Nishibata, Hiroki, Go, Shintaro, Kai, Tamito, Nagata, Yuto, Muto, Taiga, Ishibashi, Yuichi, Niikura, Megumi, Suzuki, Daisuke, Matsuzaki, Teiichiro, Ishida, Katsuhiko, Mizuno, Rurie, and Kitamura, Noritaka
- Subjects
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SILICON detectors , *PARTICLE detectors , *WAVE analysis , *PARTICLE beams , *DETECTORS , *VISUAL discrimination - Abstract
In recent years, particle discrimination methods based on digital waveform analysis techniques for neutron-transmutation-doped silicon (nTD-Si) detectors have become widely used for the identification of low-energy charged particles. Although the particle discrimination capability of this method has been well demonstrated for small incident angles, the particle discrimination performance may be affected by changes in the detector response when the detector is moved closer to the charged particle source and the incident position distribution and incident angle distribution to the detector become wide. In this study, we performed a beam test for particle discrimination in light-charged (Z ≤ 2) particles using the digital waveform analysis method with a pad-type nTD-Si detector and investigated the dependence of the performance of the particle discrimination on the incident position and incident angle. As the incident angle increased, a decrease in the maximum current was observed, which was sufficient to affect the performance of the particle discrimination. This decrease can be expressed as a function of the penetration depth of the charged particles into the detector, which varies for each nuclide. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
12. Pulse Shape Analysis of Si Detector Signals from Fission Fragments using the LOHENGRIN Spectrometer
- Abstract
Nuclear physics experiments typically involve the collection and analysis of detector signals produced by the interaction of subatomic particles with matter to deduce various quantities. When heavy ions are involved, Si Detector signals are distorted by the formation of a plasma-like cloud from the interaction between the heavy ions and the detector material. The signal amplitude is reduced and delayed, two effects known as Pulse Height Defect (PHD) and Plasma Delay Time (PDT). A recent experiment was performed at the Institut Laue-Langevin(ILL) experimental nuclear reactor facility in Grenoble, using the LOHENGRIN mass spectrometer, to study these walk effects. The purpose of this project is to use a subset of the data to perform pulse shape analysis and develop a parametrization of the pulse waveform in order to better understand the PDT and PHD and how the pulses are affected. Initially, the PDT and PHD are estimated for masses 90, 100, 130 and 143 u using already established methods. The pulse waveforms are then investigated and a suitable parametrization of the pulse waveform is developed. The region around the pulse onset, which is important in extracting the timing characteristics of the pulse, is found to be described rather well by the Landau function. The Landau function parameters are further investigated and correlations with pulse shape characteristics are discussed. Finally, this novel parametrization is used as an alternative approach to estimate the PDT for the same masses as initially. Comparisons between the two methods indicate that the PDT is actually a combined effect of the physical plasma delay and the walk effects introduced by the underlying triggering routine that is used during offline analysis.
- Published
- 2023
13. Pulse Shape Analysis of Si Detector Signals from Fission Fragments using the LOHENGRIN Spectrometer
- Abstract
Nuclear physics experiments typically involve the collection and analysis of detector signals produced by the interaction of subatomic particles with matter to deduce various quantities. When heavy ions are involved, Si Detector signals are distorted by the formation of a plasma-like cloud from the interaction between the heavy ions and the detector material. The signal amplitude is reduced and delayed, two effects known as Pulse Height Defect (PHD) and Plasma Delay Time (PDT). A recent experiment was performed at the Institut Laue-Langevin(ILL) experimental nuclear reactor facility in Grenoble, using the LOHENGRIN mass spectrometer, to study these walk effects. The purpose of this project is to use a subset of the data to perform pulse shape analysis and develop a parametrization of the pulse waveform in order to better understand the PDT and PHD and how the pulses are affected. Initially, the PDT and PHD are estimated for masses 90, 100, 130 and 143 u using already established methods. The pulse waveforms are then investigated and a suitable parametrization of the pulse waveform is developed. The region around the pulse onset, which is important in extracting the timing characteristics of the pulse, is found to be described rather well by the Landau function. The Landau function parameters are further investigated and correlations with pulse shape characteristics are discussed. Finally, this novel parametrization is used as an alternative approach to estimate the PDT for the same masses as initially. Comparisons between the two methods indicate that the PDT is actually a combined effect of the physical plasma delay and the walk effects introduced by the underlying triggering routine that is used during offline analysis.
- Published
- 2023
14. Conceptual design of the AGATA 2 pi array at LNL
- Abstract
The Advanced GAmma Tracking Array (AGATA) has been installed at Laboratori Nazionali di Legnaro (LNL), Italy. In this installation, AGATA will consist, at the beginning, of 13 AGATA triple clusters (ATCs) with an angular coverage of 1n,and progressively the number of ATCs will increase up to a 2 pi angular coverage. This setup will exploit both stable and radioactive ion beams delivered by the Tandem-PIAVE-ALPI accelerator complex and the SPES facility. The new implementation of AGATA at LNL will be used in two different configurations, firstly one coupled to the PRISMA large-acceptance magnetic spectrometer and lately a second one at Zero Degrees, along the beam line. These two configurations will allow us to cover a broad physics program, using different reaction mechanisms, such as Coulomb excitation, fusion-evaporation, transfer and fission at energies close to the Coulomb barrier. These setups have been designed to be coupled with a large variety of complementary detectors such as charged particle detectors, neutron detectors, heavy-ion detectors, high-energy gamma-ray arrays, cryogenic and gasjet targets and the plunger device for lifetime measurements. We present in this paper the conceptual design, characteristics and performance figures of this implementation of AGATA at LNL.
- Published
- 2023
- Full Text
- View/download PDF
15. [formula omitted]-ray tracking with AGATA: A new perspective for spectroscopy at radioactive ion beam facilities.
- Author
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Reiter, P.
- Subjects
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RADIOACTIVE nuclear beams , *ION beams , *NUCLEAR structure , *DIGITAL electronics , *GERMANIUM detectors , *PENNING trap mass spectrometry - Abstract
The Advanced GAmma Tracking Array (AGATA) is a next generation high-resolution γ -ray spectrometer for nuclear structure studies based on the principle of γ -ray tracking. It is built from high-fold segmented germanium detectors which will operate in position-sensitive mode by employing digital electronics and pulse-shape decomposition algorithms. The unique combination of highest detection efficiency and position sensitivity allows spectroscopic studies with instable ion beams of lowest intensity. The first implementation of the array consisted of five AGATA modules; it was operated at INFN Legnaro. A larger array of AGATA modules was used at GSI for experiments with unstable ion beams at relativistic energies. At the moment the spectrometer is hosted by GANIL. In the near future AGATA will be employed at the leading infrastructures for nuclear structure studies in Europe. The presentation will illustrate the potential of the novel gamma-ray tracking method by physics cases from the different exploitation sites. Perspectives and opportunities for γ -ray spectroscopy at future radioactive ion beam facilities are presented and discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
16. Thermal Neutron Detection by Entrapping 6LiF Nanodiamonds in Siloxane Scintillators
- Author
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Degerlier, M., Carturan, S., Marchi, T., Dalla Palma, M., Gramegna, F., Maggioni, G., Cinausero, M., Quaranta, A., Polychroniadis, E.K., editor, Oral, Ahmet Yavuz, editor, and Ozer, Mehmet, editor
- Published
- 2015
- Full Text
- View/download PDF
17. Conceptual design of the AGATA 2π array at LNL
- Author
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J.J. Valiente-Dobón, R. Menegazzo, A. Goasduff, D. Agguiaro, P. Aguilera, F. Angelini, M. Balogh, D. Bazzacco, J. Benito, G. Benzoni, N. Bez, M. Bolognesi, S. Bottoni, D. Brugnara, S. Carollo, P. Cocconi, A. Cogo, J. Collado, F.C.L. Crespi, A. Ertoprak, R. Escudeiro, F. Galtarossa, E.R. Gamba, A. Gambalonga, B. Góngora Servín, A. Gottardo, A. Gozzelino, M. Gulmini, Z. Huang, T. Marchi, D. Mengoni, P. Modanese, D.R. Napoli, J. Pellumaj, R.M. Pérez-Vidal, S. Pigliapoco, E. Pilotto, L. Ramina, M. Rampazzo, W. Raniero, M. Rebeschini, K. Rezynkina, D. Rosso, M. Scarcioffolo, D. Scarpa, M. Sedlák, R. Smith, N. Toniolo, F. Veronese, V. Volpe, L. Zago, I. Zanon, G. Zhang, R. Abels, M.L. Allegrini, C. Aufranc, G. Baulieu, C. Belkhiria, M. Benettoni, D. Benini, M. Bentley, M. Biasotto, M. Blaizot, J. Blasco Miquel, C. Boiano, A. Boston, H. Boston, A. Boujrad, P. Bourgault, A. Bracco, S. Brambilla, I. Burrows, F. Camera, S. Capra, A. Capsoni, R. Cash, J.V. Civera, E. Clément, S. Coelli, M. Cordwell, L. Corradi, S. Coudert, G. De Angelis, L. De Ruvo, G. Debras, M. Del Fabbro, J. Diklić, N. Dosme, G. Duchene, B. Duclos, J. Dudouet, J. Eberth, S. Elloumi, C. Everett, S. Fantinel, M. Fillinger, E. Fioretto, C. Fransen, A. Gadea, L. Gibelin, V. González, J. Goupil, C. Görgen, A. Grant, K. Green, J. Ha, T. Hartnett, K. Henseler, H. Hess, R. Hirsch, C. Houarner, J. Jacob, T. Joannem, D.S. Judson, N. Karkour, M. Karolak, M. Kebbiri, J. Kieffer, M. Labiche, X. Lafay, P. Le Jeannic, A. Lefevre, E. Legay, F. Legruel, S. Lenzi, S. Leoni, D. Linget, M. Liptrot, A. López-Martens, A. Lotodé, L. Manara, L. Ménager, T. Mijatović, B. Million, A. Minarello, G. Montagnoli, P. Morrall, I. Mullacrane, J. Nyberg, G. Philippon, M. Polettini, F. Popieul, A. Pullia, F. Recchia, P. Reiter, G. Richardt, M. Rocchini, A. Roger, F. Saillant, E. Sanchis, Md.S.R. Laskar, G. Secci, M.-H. Sigward, J. Simpson, N. Solenne, F. Spee, A.M. Stefanini, O. Stézowski, S. Szilner, N. Templeton, Ch. Theisen, S. Thiel, F. Tomasi, S. Tzvetkov, D. Vigano, E. Viscione, O. Wieland, K. Wimmer, G. Wittwer, M. Zielińska, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
AGATA spectrometer ,DANTE detector ,EUCLIDES detector ,LNL facility ,Plunger device ,PRISMA spectrometer ,Pulse shape analysis ,TRACE detector ,γ-ray tracking ,Nuclear and High Energy Physics ,Settore FIS/04 - Fisica Nucleare e Subnucleare ,ray tracking ,[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,Instrumentation - Abstract
International audience; The Advanced GAmma Tracking Array (AGATA) has been installed at Laboratori Nazionali di Legnaro (LNL), Italy. In this installation, AGATA will consist, at the beginning, of 13 AGATA triple clusters (ATCs) with an angular coverage of 1π, and progressively the number of ATCs will increase up to a 2π angular coverage. This setup will exploit both stable and radioactive ion beams delivered by the Tandem–PIAVE-ALPI accelerator complex and the SPES facility. The new implementation of AGATA at LNL will be used in two different configurations, firstly one coupled to the PRISMA large-acceptance magnetic spectrometer and lately a second one at Zero Degrees, along the beam line. These two configurations will allow us to cover a broad physics program, using different reaction mechanisms, such as Coulomb excitation, fusion-evaporation, transfer and fission at energies close to the Coulomb barrier. These setups have been designed to be coupled with a large variety of complementary detectors such as charged particle detectors, neutron detectors, heavy-ion detectors, high-energy γ-ray arrays, cryogenic and gasjet targets and the plunger device for lifetime measurements. We present in this paper the conceptual design, characteristics and performance figures of this implementation of AGATA at LNL.
- Published
- 2023
18. Nuclear fragment identification with [formula omitted]E-E telescopes exploiting silicon carbide detectors.
- Author
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Ciampi, C., Pasquali, G., Altana, C., Bini, M., Boscardin, M., Calcagno, L., Casini, G., Cirrone, G.A.P., Fazzi, A., Giove, D., Gorini, G., Labate, L., La Via, F., Lanzalone, G., Litrico, G., Muoio, A., Ottanelli, P., Poggi, G., Puglia, S.M.R., and Rebai, M.
- Subjects
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SILICON carbide , *NUCLEAR fragmentation , *NUCLEAR reactions , *SILICON detectors , *TELESCOPES - Abstract
Abstract A study of the response of three Δ E-E telescopes to fragments produced in nuclear interactions at 40 AMeV is presented. All the employed telescopes feature silicon carbide (SiC) detectors for at least one detection stage. Two identification methods have been used and their performance discussed: the Δ E-E technique and the Pulse Shape Analysis technique (for identification of nuclear fragments stopped in a single SiC layer). Identification capabilities similar to those obtained with the best available silicon detectors have been found for the SiC detector prototypes studied in this work. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
19. Development of pulse shape analysis for noise reduction in Si-based neutron detectors.
- Author
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Mauri, G., Mariotti, M., Casinini, F., Sacchetti, F., and Petrillo, C.
- Subjects
- *
NOISE control , *SILICON , *NEUTRON counters , *MICROSTRIP transmission lines , *THERMAL neutrons , *GADOLINIUM - Abstract
Abstract The application of Si sensors coupled to Gd converters as thermal neutron counters is assessed in a series of test experiments on the neutron beam, among which scattering from standard samples. The prototype 1d detector is a Si microstrip sensor directly coupled to natural Gd converter and equipped with standard front-end electronics. The raw scattering data, collected by interfacing the detector with the data acquisition system available at the neutron source, show advantages and limits of this technology when applied to neutron detection. To improve the performances of the Si-based detector by means of an optimized discrimination of the neutron signals from noise and background radiation, a pulse shape analysis method is proposed. The effectiveness of this method is then explored by experimental tests on the neutron beam of two more prototype detectors, namely a PIN diode coupled to 157Gd 2 O 3 converters, and a Silicon photo-multiplier (SiPM) coupled to neutron scintillators. This study is aimed to real time applications and single event storage of the neutron information in time of flight instrumentation. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
20. Evaluation of Eu:LiCAF for neutron detection utilizing SiPMs and portable electronics.
- Author
-
Ford, Michael A., O'Day, Buckley E., McClory, John W., Sharma, Manish K., and Danagoulian, Areg
- Subjects
- *
NEUTRON counters , *LITHIUM compounds , *EUROPIUM , *HELIUM isotopes , *PHOTOMULTIPLIERS , *PORTABLE computers - Abstract
Abstract With the increasing cost and decreasing availability of 3He, there have been many efforts to find alternative neutron detection materials. Lithium calcium aluminum fluoride (LiCAF) enriched to 95% 6Li doped with europium was evaluated here as a replacement material for 3He. Wafers 0.5 cm thick, consisting of LiCAF crystals in a rubberized matrix, were embedded with wavelength shifting fibers (WSF) and mated to silicon photo-multipliers (SiPMs) to measure the photon response in a flux of neutrons from a DD neutron generator. Excellent discrimination was realized between neutrons and gammas, and both pulse-height discrimination and pulse-shape analysis were explored. A Figure of Merit (FoM) of 1.03 was achieved. By applying pulse-shape analysis, a simple neutron count output was generated by utilizing a low-pass filter to suppress fast pulses from the SiPM output and subsequently applying a threshold to the remaining signal. Custom electronics were built to bias the SiPMs, then amplify, filter, discriminate, and digitize the LiCAF/WSF scintillation photons, resulting in a digital pulse that can easily be counted with any microcontroller or field programmable gate array. A significant advantage of LiCAF is that it can be fabricated into any shape/size (when embedded in a rubberized matrix), and the light output and transparency is sufficient to allow for thicker scintillators which enable detection of both thermal and epithermal neutrons. This work demonstrated that Eu:LiCAF is capable of discriminating gammas from neutrons and is a potential replacement material for 3He, especially for nuclear security applications and neutron spectroscopy. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
21. Identification of anomalous fast bulk events in a p-type point-contact germanium detector
- Author
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Li, Ren-Ming-Jie, Liu, Shu-Kui, Lin, Shin-Ted, Yang, Li-Tao, Yue, Qian, Fang, Chang-Hao, Jia, Hai-Tao, Jiang, Xi, Li, Qian-Yun, Liu, Yu, Yan, Yu-Lu, Zhao, Kang-Kang, Zhang, Lei, Tang, Chang-Jian, Xing, Hao-Yang, and Zhu, Jing-Jun
- Published
- 2022
- Full Text
- View/download PDF
22. Cluster in Nuclei: Experimental Perspectives
- Author
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Papka, P., Beck, C., and Beck, Christian, editor
- Published
- 2012
- Full Text
- View/download PDF
23. On the AGATA performances at low γ-ray energies
- Author
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Clément, E, Ljungvall, J, Pérez-Vidal, R, Dudouet, J, Ménager, L, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratori Nazionali di Legnaro (LNL), Istituto Nazionale di Fisica Nucleare (INFN), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), AGATA, and ANR-17-CE31-0026,OASIS,Optimisation d'Agata pour la physique(2017)
- Subjects
[PHYS]Physics [physics] ,AGATA spectrometer γ-ray tracking Pulse Shape Analysis ,AGATA spectrometer ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,γ-ray tracking ,Pulse Shape Analysis - Abstract
The response function of the Advanced GAmma Tracking Array (AGATA) at low energy has been evaluated with γ-ray sources from 20 keV to 1.4 MeV. Particular interest was given to the treatment of γ-ray below 100 keV which interact predominantly by photo-electric effect in the first centimeter of the germanium crystal. The performances are evaluated and improvements to the data processing are proposed.
- Published
- 2022
24. Ultra-fast hadronic calorimetry.
- Author
-
Denisov, Dmitri, Lukić, Strahinja, Mokhov, Nikolai, Striganov, Sergei, and Ujić, Predrag
- Subjects
- *
HADRONIC atoms , *CALORIMETRY , *NUCLEAR physics experiments , *HADRONIC showers , *PROTOTYPES , *PARTICLE beams - Abstract
Calorimeters for particle physics experiments with integration time of a few ns will substantially improve the capability of the experiment to resolve event pileup and to reject backgrounds. In this paper the time development of hadronic showers induced by 30 and 60 GeV positive pions and 120 GeV protons is studied using Monte Carlo simulation and beam tests with a prototype of a sampling steel-scintillator hadronic calorimeter. In the beam tests, scintillator signals induced by hadronic showers in steel are sampled with a period of 0.2 ns and precisely time-aligned in order to study the average signal waveform at various locations with respect to the beam particle impact. Simulations of the same setup are performed using the MARS15 code. Both simulation and test beam results suggest that energy deposition in steel calorimeters develop over a time shorter than 2 ns providing opportunity for ultra-fast calorimetry. Simulation results for an “ideal” calorimeter consisting exclusively of bulk tungsten or copper are presented to establish the lower limit of the signal integration window. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
25. Position resolution simulations for the inverted-coaxial germanium detector, SIGMA.
- Author
-
Wright, J.P., Harkness-Brennan, L.J., Boston, A.J., Judson, D.S., Labiche, M., Nolan, P.J., Page, R.D., Pearce, F., Radford, D.C., Simpson, J., and Unsworth, C.
- Subjects
- *
GERMANIUM detectors , *SEMICONDUCTOR detectors , *X-ray spectroscopy , *NUCLEAR physics , *NUCLEAR energy - Abstract
The SIGMA Germanium detector has the potential to revolutionise γ -ray spectroscopy, providing superior energy and position resolving capabilities compared with current large volume state-of-the-art Germanium detectors. The theoretical position resolution of the detector as a function of γ -ray interaction position has been studied using simulated detector signals. A study of the effects of RMS noise at various energies has been presented with the position resolution ranging from 0.33 mm FWHM at E γ = 1 MeV , to 0.41 mm at E γ = 150 keV. An additional investigation into the effects pulse alignment have on pulse shape analysis and in turn, position resolution has been performed. The theoretical performance of SIGMA operating in an experimental setting is presented for use as a standalone detector and as part of an ancillary system. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
26. Pulse shape discrimination performance of inverted coaxial Ge detectors.
- Author
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Domula, A., Hult, M., Kermaïdic, Y., Marissens, G., Schwingenheuer, B., Wester, T., and Zuber, K.
- Subjects
- *
NUCLEAR counters , *NEUTRINOLESS double beta decay , *ATOMIC mass , *RADIOACTIVE source strength , *RADIOACTIVE decay - Abstract
We report on the characterization of two inverted coaxial Ge detectors in the context of being employed in future 76 Ge neutrinoless double beta ( 0 ν β β ) decay experiments. It is an advantage that such detectors can be produced with bigger Ge mass as compared to the planar Broad Energy Ge (BEGe) or p-type Point Contact (PPC) detectors that are currently used in the Gerda and Majorana Demonstrator 0 ν β β decay experiments respectively. This will result in a lower background for the search of 0 ν β β decay due to a reduction of detector surface to volume ratio, cables, electronics and holders which are dominating nearby radioactive sources. The measured resolution near the 76 Ge Q-value at 2039 keV is 2.3 keV FWHM and their pulse-shape discrimination of background events are similar to BEGe and PPC detectors. It is concluded that this type of Ge-detector is suitable for usage in 76 Ge 0 ν β β decay experiments. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
27. Bulk and surface event identification in p-type germanium detectors.
- Author
-
Yang, L.T., Li, H.B., Wong, H.T., Agartioglu, M., Chen, J.H., Jia, L.P., Jiang, H., Li, J., Lin, F.K., Lin, S.T., Liu, S.K., Ma, J.L., Sevda, B., Sharma, V., Singh, L., Singh, M.K., Soma, A.K., Sonay, A., Yang, S.W., and Wang, L.
- Subjects
- *
GERMANIUM detectors , *WEAKLY interacting massive particle detectors , *NEUTRINOS , *DARK matter , *SPECTRAL energy distribution - Abstract
The p-type point-contact germanium detectors have been adopted for light dark matter WIMP searches and the studies of low energy neutrino physics. These detectors exhibit anomalous behavior to events located at the surface layer. The previous spectral shape method to identify these surface events from the bulk signals relies on spectral shape assumptions and the use of external calibration sources. We report an improved method in separating them by taking the ratios among different categories of in situ event samples as calibration sources. Data from CDEX-1 and TEXONO experiments are re-examined using the ratio method. Results are shown to be consistent with the spectral shape method. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
28. Time-resolved gamma spectroscopy of single events.
- Author
-
Wolszczak, W. and Dorenbos, P.
- Subjects
- *
TIME-resolved spectroscopy , *SCINTILLATORS , *DIGITAL signal processing , *PHOTONS , *SOLID state physics - Abstract
In this article we present a method of characterizing scintillating materials by digitization of each individual scintillation pulse followed by digital signal processing. With this technique it is possible to measure the pulse shape and the energy of an absorbed gamma photon on an event-by-event basis. In contrast to time-correlated single photon counting technique, the digital approach provides a faster measurement, an active noise suppression, and enables characterization of scintillation pulses simultaneously in two domains: time and energy. We applied this method to study the pulse shape change of a CsI(Tl) scintillator with energy of gamma excitation. We confirmed previously published results and revealed new details of the phenomenon. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
29. Anomaly Detection in a Reactor Coolant Pump Flywheel System via Pulse Shape Analysis.
- Author
-
Gabbar, H., Mba, C., Marchesiello, S., Fasana, A., and Garibaldi, L.
- Subjects
- *
ANOMALY detection (Computer security) , *FLYWHEELS , *SHAPE analysis (Computational geometry) - Abstract
In this study, a method that discriminates between anomalies present or absent in the vibration signal of a flywheel system is developed. First by means of MATLAB and Simulink, a simple flywheel system under different feasible conditions is simulated using equations of motion to capture the dynamic behaviors of the components of the system along their lines of action. The resulting vibration signals obtained from the simulations are combined with varying levels of noise and then subjected to pulse shape analysis (PSA). PSA is a tool that has been mostly used in the field of nuclear engineering, and it is explored and used differently here with the objective of developing a suitable PSA algorithm that can differentiate between vibration signals based on the presence or absence of an anomaly. The algorithm is a time-domain technique with minimal computational time that can be very easily applied. At the end, it is shown that the developed PSA algorithm can identify an anomaly in a vibration signal on the basis of a defined pattern under certain attainable conditions. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
30. Performance test of a position sensitive planar germanium detector for phase-III DESPEC experiments.
- Author
-
Sharma, Arzoo, Palit, R., Habermann, T., Gerl, J., Kojouharov, I., Schaffner, H., Herrmann, P., Wollersheim, H.J., Saha, S., Das, Biswajit, Dey, P., Donthi, R., Naidu, B.S., Mandal, S., and Singh, Pushpendra P.
- Subjects
- *
GERMANIUM detectors , *POSITRON annihilation , *CHARGE carriers , *OPTICAL scanners , *SURFACE charges , *DETECTORS - Abstract
The position sensitivity of a planar segmented double-sided germanium strip detector, with 10 × 10 electrical segmentation in orthogonal directions, has been studied using the coincidence method. The coincidences were set up between an imaging scanner and the PSPGe (Position Sensitive Planar Germanium) detector using a positron source, 22Na, and analyzed by employing the Positron Annihilation Correlation principle. A collimated 241Am source scan was also performed to find position resolution along X and Y axes using low energy gamma-ray source. The primary objective of this work is to study the charge carrier transportation for gamma-ray interactions inside the PSPGe detector. In order to select the electrodes of interest and to obtain the pulse shapes for each event, two-dimensional images have been processed. The net charge induced on the surface of the electrode, calculated using the pulse shape analysis procedure, has been used to profile the position resolution and gamma interaction depth. The present study is an input for the deployment of PSPGe detector in the future decay spectroscopy experiments to be performed at the Facility for Antiproton and Ion Research (FAIR) in Germany. This work investigates the gamma interaction depth by calculating the rise-time of traces stored for each gamma interaction inside the detector volume, providing ≈ 1 mm resolution along the depth. The position resolution of the detector in lateral directions, determined using the amplitude difference of the transient charges, has also been found to be ≈ 1 mm. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
31. Development of digital electronics for the search of SHE nuclei using GARIS-II/III at RIKEN.
- Author
-
Brionnet, P., Grzywacz, R.K., Kaji, D., King, T.T., Niwase, T., Morimoto, K., Rykaczewski, K.P., and Sakai, H.
- Subjects
- *
DIGITAL electronics , *SUPERHEAVY elements , *DATA acquisition systems , *HEAVY elements , *SILICON detectors - Abstract
This work describes the implementation of a digital data acquisition system for the search and study of short-lived isotopes or superheavy elements at the GARIS-III separator at the RIKEN Nishina Center. A reduction to 26 ± 0. 5 keV in the average value of the Full Width at Half Maximum of the alpha spectrum at 7.133 MeV was achieved, combined with a reduction of the dead time of the overall system to around a few tens of nanoseconds for the detection of very fast decay chains. Moreover, we measured a reduction of the background induced by particles crossing the implantation detector using pulse shape analysis techniques. The detail of the optimization and analysis will be presented. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
32. Conceptual design of the AGATA 2[formula omitted] array at LNL.
- Author
-
Valiente-Dobón, J.J., Menegazzo, R., Goasduff, A., Agguiaro, D., Aguilera, P., Angelini, F., Balogh, M., Bazzacco, D., Benito, J., Benzoni, G., Bez, N., Bolognesi, M., Bottoni, S., Brugnara, D., Carollo, S., Cocconi, P., Cogo, A., Collado, J., Crespi, F.C.L., and Ertoprak, A.
- Subjects
- *
CONCEPTUAL design , *PARTICLE detectors , *COULOMB barriers (Nuclear fusion) , *NEUTRON counters , *MAGNETIC spectrometer , *ION beams , *RADIOACTIVE nuclear beams - Abstract
The Advanced GAmma Tracking Array (AGATA) has been installed at Laboratori Nazionali di Legnaro (LNL), Italy. In this installation, AGATA will consist, at the beginning, of 13 AGATA triple clusters (ATCs) with an angular coverage of 1 π , and progressively the number of ATCs will increase up to a 2 π angular coverage. This setup will exploit both stable and radioactive ion beams delivered by the Tandem–PIAVE-ALPI accelerator complex and the SPES facility. The new implementation of AGATA at LNL will be used in two different configurations, firstly one coupled to the PRISMA large-acceptance magnetic spectrometer and lately a second one at Zero Degrees, along the beam line. These two configurations will allow us to cover a broad physics program, using different reaction mechanisms, such as Coulomb excitation, fusion-evaporation, transfer and fission at energies close to the Coulomb barrier. These setups have been designed to be coupled with a large variety of complementary detectors such as charged particle detectors, neutron detectors, heavy-ion detectors, high-energy γ -ray arrays, cryogenic and gasjet targets and the plunger device for lifetime measurements. We present in this paper the conceptual design, characteristics and performance figures of this implementation of AGATA at LNL. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
33. Prospects for the Detection of SUSY Dark Matter
- Author
-
Cline, David B., Klapdor-Kleingrothaus, Hans Volker, editor, and Arnowitt, Richard, editor
- Published
- 2006
- Full Text
- View/download PDF
34. Status of Evidence for Neutrinoless Double Beta Decay
- Author
-
Klapdor-Kleingrothaus, H. V., Dietz, A., Krivosheina, I. V., Klapdor-Kleingrothaus, H. V., editor, and Viollier, R. D., editor
- Published
- 2002
- Full Text
- View/download PDF
35. Dark Matter Results in the MIBETA Experiment
- Author
-
Pirro, Stefano, Alessandrello, Angelo, Brofferio, Chiara, Bucci, Carlo, Cremonesi, Oliviero, Fiorini, Ettore, Giuliani, Andrea, Nucciotti, Angelo, Pavan, Maura, Pessina, Gianluigi, Pobes, Carlos, Previtali, Ezio, Vanzini, Marco, Zanotti, Luigi, and Cline, David B., editor
- Published
- 2001
- Full Text
- View/download PDF
36. Pulse Shape Discrimination and Dark Matter Search with NaI(Tl) Scintillator at the Laboratoire Souterrain de Modane
- Author
-
Gerbier, G., Mallet, J., Mosca, L., Tao, C., and Cline, David B., editor
- Published
- 2001
- Full Text
- View/download PDF
37. Results of the Saclay NaI(Tl) WIMP Search Experiment and Comparison with Other NaI(Tl) Experiments
- Author
-
Gerbier, G., Mallet, J., Mosca, L., Tao, C., and Klapdor-Kleingrothaus, H. V., editor
- Published
- 2001
- Full Text
- View/download PDF
38. Latest Results from the Heidelberg-Moscow Double-Beta-Decay Experiment
- Author
-
Klapdor-Kleingrothaus, H. V., Dietz, A., Baudis, L., Heusser, G., Krivosheina, I. V., Kolb, S., Majorovits, B., Paes, H., Strecker, H., Alexeev, V., Balysh, A., Bakalyarov, A., Belyaev, S. T., Lebedev, V. I., Zhukov, S., and Klapdor-Kleingrothaus, H. V., editor
- Published
- 2001
- Full Text
- View/download PDF
39. Isotopic identification using Pulse Shape Analysis of current signals from silicon detectors: Recent results from the FAZIA collaboration.
- Author
-
Pastore, G., Gruyer, D., Ottanelli, P., Le Neindre, N., Pasquali, G., Alba, R., Barlini, S., Bini, M., Bonnet, E., Borderie, B., Bougault, R., Bruno, M., Casini, G., Chbihi, A., Dell'Aquila, D., Dueñas, J.A., Fabris, D., Francalanza, L., Frankland, J.D., and Gramegna, F.
- Subjects
- *
TELESCOPES , *SILICON detectors , *PULSE shaping (Digital communications) , *SILICON isotopes , *SPLINE theory - Abstract
The FAZIA apparatus exploits Pulse Shape Analysis (PSA) to identify nuclear fragments stopped in the first layer of a Silicon-Silicon-CsI(Tl) detector telescope. In this work, for the first time, we show that the isotopes of fragments having atomic number as high as Z∼20 can be identified. Such a remarkable result has been obtained thanks to a careful construction of the Si detectors and to the use of low noise and high performance digitizing electronics. Moreover, optimized PSA algorithms are needed. This work deals with the choice of the best algorithm for PSA of current signals. A smoothing spline algorithm is demonstrated to give optimal results without requiring too much computational resources. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
40. Simultaneous measurement of neutron-induced fission and capture cross sections for 241Am at neutron energies below fission threshold.
- Author
-
Hirose, K., Nishio, K., Makii, H., Nishinaka, I., Ota, S., Nagayama, T., Tamura, N., Goto, S., Andreyev, A.N., Vermeulen, M.J., Gillespie, S., Barton, C., Kimura, A., Harada, H., Meigo, S., Chiba, S., and Ohtsuki, T.
- Subjects
- *
NEUTRON temperature , *NEUTRON cross sections , *PROTON accelerators , *ORGANIC scintillators , *NUCLEAR fission , *TIME-of-flight spectroscopy - Abstract
Fission and capture reactions were simultaneously measured in the neutron-induced reactions of 241 Am at the spallation neutron facility of the Japan Proton Accelerator Research Complex (J-PARC). Data for the neutron energy range of E n =0.1–20 eV were taken with the TOF method. The fission events were observed by detecting prompt neutrons accompanied by fission using liquid organic scintillators. The capture reaction was measured by detecting γ rays emitted in the deexcitation of the compound nuclei using the same detectors, where the prompt fission neutrons and capture γ rays were separated by a pulse shape analysis. The cross sections were obtained by normalizing the relative yields at the first resonance to evaluations or other experimental data. The ratio of the fission to capture cross sections at each resonance is compared with those from an evaluated nuclear data library and other experimental data. Some differences were found between the present values and the library/literature values at several resonances. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
41. Conceptual design of the AGATA [formula omitted] array at GANIL.
- Author
-
Clément, E., Michelagnoli, C., de France, G., J. Li, H., Lemasson, A., Dejean, C. Barthe, Beuzard, M., Bougault, P., Cacitti, J., Foucher, J.-L., Fremont, G., Gangnant, P., Goupil, J., Houarner, C., Jean, M., Lefevre, A., Legeard, L., Legruel, F., Maugeais, C., and Ménager, L.
- Subjects
- *
HEAVY ions , *NUCLEAR counters , *EXOTIC nuclei , *SPECTROMETERS , *CONCEPTUAL design , *SIMULATION methods & models - Abstract
The Advanced GAmma Tracking Array (AGATA) has been installed at the GANIL facility, Caen-France. This set-up exploits the stable and radioactive heavy-ions beams delivered by the cyclotron accelerator complex of GANIL. Additionally, it benefits from a large palette of ancillary detectors and spectrometers to address in-beam γ-ray spectroscopy of exotic nuclei. The set-up has been designed to couple AGATA with a magnetic spectrometer, charged-particle and neutron detectors, scintillators for the detection of high-energy γ rays and other devices such as a plunger to measure nuclear lifetimes. In this paper, the design and the mechanical characteristics of the set-up are described. Based on simulations, expected performances of the AGATA 1π array are presented. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
42. Sub-voxel identification of gamma-ray interaction positions within a pixelated CZT detector through signal analysis.
- Author
-
Rintoul, E., Brown, H.R., Everett, C.T.A., Green, K., Harkness-Brennan, L.J., Judson, D.S., Wells, D., and Cherlin, A.
- Subjects
- *
CADMIUM zinc telluride , *DETECTORS , *CESIUM isotopes - Abstract
Cadmium zinc telluride (CZT) detectors are well suited for use in gamma-imaging applications thanks to their room-temperature operation, excellent energy resolution, and three-dimensional sensitivity to positions of gamma-ray interactions. In many of these applications, the position resolution with which gamma-interactions can be determined is crucial for high quality imaging. Finer pixelisation may provide improved position resolution but at the cost of increased fabrication cost and degradation of spectral performance. This work sets out to instead investigate and quantify the three-dimensional position resolution achievable using pulse shape analysis applied to digital signals, arising from interactions in a CZT detector pixelated into 2 × 2 × 5 mm 3 voxels. The signal response of a 3 × 3 pixel cluster has been characterised as a function of gamma-ray interaction position using collimated 57Co and 137Cs sources. Simple pulse shape analysis algorithms using the transient image and charge collection signals have been developed and applied to achieve a sub-voxel position resolution of better than 0.65 × 0.69 × 1.26 mm 3 at 122 keV and of 1.06 mm through 5 mm depth at 662 keV, not accounting for divergence of the collimated beam used to evaluate performance. Assessment of the contribution of the diverging gamma-beam placed a lower bound on the achievable positions resolution in 5 mm thickness at 122 keV of 290 μ m. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
43. DNA Content Determination
- Author
-
Davies, Derek, Diamond, Rochelle A., editor, and Demaggio, Susan, editor
- Published
- 2000
- Full Text
- View/download PDF
44. Search forNew Physics with Neutrinoless Double β Decay
- Author
-
Klapdor-Kleingrothaus, H. V., Baudis, L., Hellmig, J., Hirsch, M., Kolb, S., Päs, H., Ramachers, Y., Lellouch, Daniel, editor, Mikenberg, Giora, editor, and Rabinovici, Eliezer, editor
- Published
- 1999
- Full Text
- View/download PDF
45. Discovery of the new proton emitter 144Tm
- Author
-
Grzywacz, R., Karny, M., Rykaczewski, K. P., Batchelder, J. C., Bingham, C. R., Fong, D., Gross, C. J., Krolas, W., Mazzocchi, C., Piechaczek, A., Tantawy, M. N., Winger, J. A., Zganjar, E. F., Gross, Carl J., editor, Nazarewicz, Witold, editor, and Rykaczewski, Krzysztof P., editor
- Published
- 2005
- Full Text
- View/download PDF
46. Algorithms of pulse shape analysis for Gammasphere under high count rate conditions.
- Author
-
Begley, L., Zhu, S., Carpenter, M.P., Anderson, J.T., Janssens, R.V.F., Lauritsen, T., McCutchan, E.A., Oberling, M.B., Seweryniak, D., and Wilt, P.
- Subjects
- *
GERMANIUM radiation detectors , *DIGITAL electronics , *ALGORITHMS , *COUNTING , *TRAPEZOIDS - Abstract
The implementation of digital electronics for the multi-detector Gammasphere array has provided an opportunity to perform experiments which exceed the technical capabilities of its analog counterpart. The pulse shape analysis of HPGe detectors is presented for the purpose of determining the γ -ray energy under high-counting rates and short integration times with the aim of improving the data throughput. A revised trapezoidal algorithm is delineated which is able to determine the γ -ray energies during the offline analysis without being constrained by predetermined parameters. The performance of this algorithm is discussed, and compared with that of the analog system. The measured energy resolution meets expectations for operations with high-counting rates and short integration times. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
47. Flow Cytometric Analysis of Nuclear Associated Antigens
- Author
-
Watson, James V. and Jacquemin-Sablon, Alain, editor
- Published
- 1993
- Full Text
- View/download PDF
48. Wilcoxon signed-rank-based technique for the pulse-shape analysis of HPGe detectors.
- Author
-
Martín, S., Quintana, B., and Barrientos, D.
- Subjects
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WILCOXON signed-rank test , *PARTICLE interactions , *GERMANIUM crystallography , *PARTICLE detectors , *SIMULATION methods & models - Abstract
The characterization of the electric response of segmented-contact high-purity germanium detectors requires scanning systems capable of accurately associating each pulse with the position of the interaction that generated it. This process requires an algorithm sensitive to changes above the electronic noise in the pulse shapes produced at different positions, depending on the resolution of the Ge crystal. In this work, a pulse-shape comparison technique based on the Wilcoxon signed-rank test has been developed. It provides a method to distinguish pulses coming from different interaction points in the germanium crystal. Therefore, this technique is a necessary step for building a reliable pulse-shape database that can be used later for the determination of the position of interaction for γ-ray tracking spectrometry devices such as AGATA, GRETA or GERDA. The method was validated by comparison with a χ 2 test using simulated and experimental pulses corresponding to a Broad Energy germanium detector (BEGe). [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
49. Measurement of 222Rn by absorption in plastic scintillators and alpha/beta pulse shape discrimination.
- Author
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Mitev, Krasimir K.
- Subjects
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SCINTILLATORS , *RADIATION absorption , *ALPHA ray detection , *BETA ray detection , *THORON - Abstract
This work demonstrates that common plastic scintillators like BC-400, EJ-200 and SCSF-81 absorb radon and their scintillation pulse decay times are different for alpha- and beta-particles. This allows the application of pulse shape analysis for separation of the pulses of alpha- and beta-particles emitted by the absorbed radon and its progeny. It is shown that after pulse shape discrimination of beta-particles’ pulses, the energy resolution of BC-400 and EJ-200 alpha spectra is sufficient to separate the peaks of 222 Rn, 218 Po and 214 Po and allows 222 Rn measurements that are unaffected by the presence of thoron ( 220 Rn) in the environment. The alpha energy resolution of SCSF-81 in the experiments degrades due to imperfect collection of the light emitted inside the scintillating fibers. The experiments with plastic scintillation microspheres (PSM) confirm previous findings of other researchers that PSM have alpha-/beta-discrimination properties and show suitability for radon measurements. The diffusion length of radon in BC-400 and EJ-200 is determined. The pilot experiments show that the plastic scintillators are suitable for radon-in-soil-gas measurements. Overall, the results of this work suggest that it is possible to develop a new type of radon measurement instruments which employ absorption in plastic scintillators, pulse-shape discrimination and analysis of the alpha spectra. Such instruments can be very compact and can perform continuous, real-time radon measurements and thoron detection. They can find applications in various fields from radiation protection to earth sciences. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
50. Performance of the AGATA γ-ray spectrometer in the PreSPEC set-up at GSI.
- Author
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Lalović, N., Louchart, C., Michelagnoli, C., Perez-Vidal, R.M., Ralet, D., Gerl, J., Rudolph, D., Arici, T., Bazzacco, D., Clément, E., Gadea, A., Kojouharov, I., Korichi, A., Labiche, M., Ljungvall, J., Lopez-Martens, A., Nyberg, J., Pietralla, N., Pietri, S., and Stezowski, O.
- Subjects
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GAMMA ray spectrometer , *NUCLEAR physics , *ALGORITHMS , *GERMANIUM , *NUCLEAR structure - Abstract
In contemporary nuclear physics, the European Advanced GAmma Tracking Array (AGATA) represents a crucial detection system for cutting-edge nuclear structure studies. AGATA consists of highly segmented high-purity germanium crystals and uses the pulse-shape analysis technique to determine both the position and the energy of the γ-ray interaction points in the crystals. It is the tracking algorithms that deploy this information and enable insight into the sequence of interactions, providing information on the full or partial absorption of the γ ray. A series of dedicated performance measurements for an AGATA set-up comprising 21 crystals is described. This set-up was used within the recent PreSPEC–AGATA experimental campaign at the GSI Helmholtzzentrum für Schwerionenforschung. Using the radioactive sources 56 Co, 60 Co and 152 Eu, absolute and normalized efficiencies and the peak-to-total of the array were measured. These quantities are discussed using different data analysis procedures. The quality of the pulse-shape analysis and the tracking algorithm are evaluated. The agreement between the experimental data and the Geant4 simulations is also investigated. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
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