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Nuclear and High Energy Physics II

Session chair: Kurosawa , Shunsuke (Tohoku University, New Industry Creation Hatchery Cente, Sendai, Japan); Miyoshi , Toshinobu (High Energy Accelerator Research Organization (KEK), Tsukuba, Japan)
Shortcut: N-30
Date: Thursday, 21 October, 2021, 11:45 AM - 1:45 PM
Room: NSS - 4
Session type: NSS Session


Click on an contribution to preview the abstract content.

11:45 AM N-30-01

An innovative neutron spectrometer for the characterization of complex neutron fields (#66)

P. Casolaro1, I. Mateu1, L. Mercolli1, A. Pola2, D. Rastelli3, P. Scampoli1, 4, S. Braccini1

1 University of Bern, Albert Einstein Center for Fundamental Physics (AEC), Laboratory for High Energy Physics (LHEP), Bern, Switzerland
2 Politecnico di Milano, Dipartimento di Energia, Milano, Italy
3 Raylab s.r.l., Caravaggio (BG), Italy
4 University of Napoli Federico II, Department of Physics “Ettore Pancini”, Napoli, Italy


This work presents the first measurements performed with an innovative neutron spectrometer in the context of a medical cyclotron, namely the IBA 18/18 HC in operation at the Bern University Hospital (Inselspital). The aim was to test the capabilities and performances of this new spectrometer in view of the realization of a neutron beam facility exploiting the external beam line of the Bern cyclotron. The spectrometer, named DIAMON (Direction-aware Isotropic and Active neutron MONitor with spectrometric capabilities) allows for real time spectroscopy of neutron fields from thermal to fast energies. It relies on a series of silicon detectors. The spectral response, the directionality of the neutron fields as well as the dosimetric information are provided in real-time by means of a high-level graphical user interface. Neutron beams were produced by the interaction of 18 MeV protons with several selected materials. The measured neutron fluence rate was found to be linear with respect to the beam current up to 105 neutrons/(cm2·s). Furthermore, the DIAMON’s response was found to be in agreement, within the experimental uncertainties, with the LB 6411 Neutron Dose Rate Probe, a well-established neutron detector. DIAMON was also successfully employed for the measurement of the neutron energy spectrum generated during routine production of 18F for Positron Emission Tomography applications. The results show the potential of DIAMON in the characterization of complex neutron fields such as those produced in a medical cyclotron for radioisotope production.

AcknowledgmentThis work was partially funded by the Swiss National Science Foundation (SNSF) (Grant CRSII5_180352).
Keywords: Neutrons, energy spectrum, cyclotrons, radiation monitoring
12:00 PM N-30-02

3D-printed scintillators with inorganic powders for detection of ionizing radiation (#396)

T. Sibilieva1, A. Boyarintsev1, B. Grinyov1, T. Nepokupnaya1, P. Zhmurin1, S. Berns2, S. Hugon2, U. Kose3, A. De Roeck3, D. Sgalaberna3

1 Institute for Scintillation Materials NAS of Ukraine, Kharkiv, Ukraine
2 HEIG-VD (Haute Ecole d'Ingegnerie et de Gestion du Canton de Vaude), Yverdon-les-Bains, Switzerland
3 3 CERN (European Organization for Nuclear Research), Geneva, Switzerland


As we have shown recently, plastic scintillators based on polystyrene with characteristics comparable with the standard production techniques were made using FDM 3D printing technology. The reflector for 3D printing was also developed, which made it possible to create complex structures such as arrays.
Current interest in 3D printing is the creation of multicomponent systems combining organic and inorganic scintillators in one detector. The development of 3D printing of inorganic scintillation layers will allow mobile creation of thin layer detectors for registration of alpha beta particles,  low-gamma and soft x-ray radiation.
The compositions of scintillation filaments based on ZnSe:Al, GOS:Pr,  GaGG:Ce and CsI:Tl powders for 3D printing using FDM technology have been developed and optimized. Composite scintillators were printed using these filaments and measured.
Composite scintillators based on ZnSe:Al for detection of alpha and beta particles have been obtained. Scintillation filaments with 50-75 weight % of  ZnSe:Al powder were made using PS, ABS, SBS, and PMMA plastics as binder medium.
Films for X-ray imaging, effective for registration of soft X-ray radiation (20 - 90 keV), were obtained on the basis of ZnSe:Al, GOS:Pr,  GaGG:Ce and CsI:Tl powders.
The best results for samples with ZnSe:Al powder were obtained with PS and PMMA plastics as the binder medium. The relative light output under alpha and beta irradiation for theese samples is reached 85-90% from industrial samples.
Spatial resolution for 0.15 mm thick 3D-printed composite films base on ZnSe:Al, GOS:Pr, GaGG:Ce or CsI:Tl powders were form 3.15 lp/mm and to 3.35 lp/mm. Obtained results are in good correlation with the data for industrial samples.

Keywords: 3D printing, additive manufactured, composite scintillators
12:15 PM N-30-03

i-TED: Compton Imaging and Machine-Learning techniques for enhanced sensitivity neutron capture time-of-flight measurements (#462)

J. Lerendegui-Marco1, V. Babiano-Suárez1, J. Balibrea-Correa1, L. Caballero1, D. Calvo1, C. Domingo-Pardo1, I. Ladarescu1

1 Instituto de Física Corpuscular, Valencia, Spain


i-TED is an innovative detection system which exploits Compton imaging techniques to achieve a superior signal-to-background ratio in  time-of-flight (n,γ) cross-section measurements. This work presents the first experimental proof-of-concept of the background rejection with i-TED carried out at CERN n_TOF using an early i-TED demonstrator. Two state-of-the-art C6D6 detectors were also used to benchmark the performance of i-TED. The i-TED prototype built for this study shows a factor of∼3 higher detection sensitivity than C6D6 detectors in the∼10 keV neutron-energy range of astrophysical interest. This contribution explores also the perspectives of further enhancement in performance attainable with the final i-TED array consisting of twenty position-sensitive detectors and new analysis methodologies based on Machine-Learning techniques. The latter provide higher (n,γ) detection efficiency and similar enhancement in the sensitivity than the analytical method based on the Compton scattering law.

AcknowledgmentThis work was supported by the European Research Council (ERC) underthe ERC Consolidator Grant project HYMNS (No. 681740), the SpanishMICINN under grants PID2019-104714GB-C21, FPA2017-83946-C2-1-P,FIS2015-71688-ERC, and CSIC under the grant PIE-201750I26.
Keywords: Neutrons, Nuclear measurements, Gamma-raydetectors, Nuclear imaging, Machine learning algorithms
12:30 PM N-30-04

Ultimate performance of the FARCOS detection system (#681)

C. Guazzoni1, 2

1 Politecnico di Milano, Dipartimento di Elettronica, Informazione e Bioingegneria, Milano, Italy
2 INFN, Sezione di Milano, Milano, Italy

on behalf of the FARCOS collaboration


FARCOS is a novel Femtoscope Array for Correlation and Spectroscopy designed to perform studies of two- and multi-particle and Intermediate Mass Fragments (IMFs) correlations in heavy-ion collisions at Fermi energies with stable and radioactive beams. The FARCOS system is a modular assembly of up to 20 telescopes to be used in combination with 4π detectors like the CHIMERA multidetector. This contribution aims at presenting the results of the experimental qualification of the whole FARCOS system with a particular attention on the ultimate achievable energy and time resolution and on their impact on the particle identification capability.


This work is supported by INFN, Istituto Nazionale di Fisica Nucleare in the framework of the NEWCHIM and CHIRONE experiments.

Keywords: hodoscopes, frontend electronics, DSSSD
12:45 PM N-30-05

Neutron-Gamma Correlation Analysis Using the Fission Sphere (FS-3) (#1040)

S. Marin1, M. S. Okar1, I. E. Hernandez1, L. M. Clark1, S. D. Clarke1, S. A. Pozzi1

1 University of Michigan, Nuclear Engineering and Radiological Sciences, Ann Arbor, Michigan, United States of America


We have designed and assembled a new organic scintillator detector array used for the analysis of the properties of the radiation emitted following nuclear fission. The goal of the array is to measure correlated fluctuations in the event-by-event neutron-gamma emission multiplicities and test the validity of theoretical models. To provide an unbiased signal, the system possesses spherical geometrical coverage of the source and its energy acceptance covers most of the neutron-gamma spectra from fission. In the experimental results presented here, we show that the system has excellent neutron-gamma discrimination and can be used to characterize neutron-gamma emission correlations. The particle discrimination is achieved through a combination of pulse-shape analysis and time of flight analysis.

AcknowledgmentWe thank Drs. Hausladen and Nattress for providing the radiation source for the experiment. This work was in part supported by the Office of Defense Nuclear Nonproliferation Research & Development (DNN R&D), National Nuclear Security Administration, US Department of Energy. This research was funded in part by the Consortium for Verification Technology under the Department of Energy National Nuclear Security Administration award DE-NA0002534.
Keywords: Fission, Instruments, Organic scintillators
1:00 PM N-30-06

Study of performance of different photodetectors and electrical signal for fast detection in fifty litres CYGNO prototype (LIME). (#1157)

F. Iacoangeli1, D. Pinci1

1 INFN - Istituto Nazionale di Fisica Nucleare, Sezione di Roma, Rome, Italy

on behalf of CYGNO Collaboration


The proposed CYGNO experiment is a one cubic meter, single-phase, gas-only Time Projection Chambers (TPCs) for Directional Dark Matter search. The particularity of CYGNO is the read-out technique based on Micro Pattern Gas Detector (MPGD) amplification of the ionization and on the collection of the yielded visible light by a scientific CMOS camera with a sub-mm position resolution. A corresponding fast light detection, through PMT or SiPM devices, allows reconstructing of the three-dimensional direction of the tracks enabling to distinguish the electron and nuclear recoils. The time performance of the photodetector and the time resolution of the acquisition system directly affects the capability in reconstructing the inclination of tracks. The performance of the different solutions is studied to guide the choice for the final application.  The best PMT and SiPM, among those examined, are installed on LIME, a 50 litres CYGNO prototype.  Optical signals and fast electrical signal of this detector are studied in this work

Keywords: SiPM, CYGNO, ArduSiPM, TPC, GEM
1:15 PM N-30-07

Application of object detection based on deep learning for etch pit analysis on CR-39 detector (#1312)

K. Tashiro1, K. Noto1, Q. M. Rashed Nizam2, N. Yasuda1

1 University of Fukui, Research Institute of Nuclear Engineering, Fukui, Japan
2 University of Chittagong, Department of Physics, Chittagong, Bangladesh


The CR-39 solid-state nuclear track detector has been used to measure nuclear reactions, because of its high charge resolution and the possibility of precise measurement of fragment emission angles. In this experimental system, the CR-39 detector is used not only as a detector but also as a target, and etch pits appear on both the front and back surfaces after chemical etching. Pattern matching method has been used for matching the positions of the etch pits on the front and back surfaces. The method required accurate alignment of the etch pits on the front and back surfaces. We have developed a new methodology for tracing ion track penetration by synthesizing images on both sides of the detector without relying on pattern matching. Object detection based on deep learning was applied to the etch pit analysis on synthesize images. The learning curve, which showing the increase in the percentage of accuracy relative to the number of trainings, has been employed to verify the effectiveness of the etch pit extraction algorithm. The applicability of the method to the measurement of charge changing cross-sections is also discussed.

AcknowledgmentWe thank the Wakasa Wan Energy Research Center personnel for their support during the heavy ion exposure.
Keywords: CR-39 detector, Deep learning, Object detection
1:30 PM N-30-08

Emission angle measurement of multiple fragments on nuclear reaction using CR-39 detector (#1328)

K. Noto1, K. Tashiro1, Q. M. Rashed Nizam2, N. Yasuda1

1 University of Fukui, Research Institute of Nuclear Engineering, Tsuruga, Japan
2 University of Chittagong, Department of Physics, Chittagong, Bangladesh


Measurement of the nuclear reaction cross section of heavy ions has long been used as a means of studying nuclear models. Precise measurements of nuclear reaction cross-sections and fragment angles provide valuable information on nuclear forces. However, there are still significant discrepancies between the cross sections predicted by nuclear models and experimental data. In particular, for the fragment emission angle, the nuclear model has not been able to reproduce the experimental values. Recently, the authors developed the new technology to measure the etch pits on both front and back surfaces of the CR-39 solid-state nuclear track detector (CR-39 detector). This allows us to measure the incident angle of ions and the emission angle of fragments with an accuracy of about 10-4 degree. The purpose of this study is to measure the emission angle of multiple fragments from those images. The etch pit images were analyzed by the PitFit to extract position and size information as ellipse shape opening mouse of etch pit. We measured the emission angles of multiple fragments using these data by estimating the decay point three-dimensionally. The angle measurement accuracy of this method can be estimated to be tanθ = 1/100 (θ ~ 0.5 degree), where it is assumed that the position resolution of the microscopic measurement is about 1 μm and the distance from the decay point to the measurement surface is about 100 μm. The high-precision angular resolution makes it possible to measure nuclear fragments scattered at small angles, and is useful to measure the nuclear reaction cross-sections with fragment angles.


We thank the WERC personnel for their help and support during the heavy ion exposure.

Keywords: CR-39 detector, emission angle measurement

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