FY2022
Quantum Beam Application Research B03 Seminar
(39th RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Dr. KANDA, Sohtaro (Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK-IMSS)) |
| Title: | 「ミュオン原子の分光によるパリティ非保存効果の観測に向けた動的過程の研究」 (Study of dynamical processes of muonic atom toward observation of parity nonconservation effects)」 |
| Language: | Japanese (Presentation slides in English) |
| Date: | Nobember 11, 2022, 11:00 |
| Venue: | RIKEN Wako Campus RIBF Bldg. & online |
| URL: | (Jpn) https://indico2.riken.jp/event/4267/ |
Quantum Beam Application Research B03 Seminar
(38th RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Professor WU, Yuntao (Shanghai Institute of Ceramics, Chinese Academy of Sciences) |
| Title: | “Development of 6Li-loaded halide scintillators toward neutron detection” |
| Language: | English |
| Date: | September 2, 2022, 14:00 |
| Venue: | zoom |
| URL: | (Eng) https://indico2.riken.jp/event/4217/ |
| Abstract: |
Neutron detectors are widely used in the field of fundamental
research, homeland security and oil well logging. In recent
years, because the most common 3He proportional
counters for thermal neutron detection are in short supply,
it is urgent to search for alternatives. Inorganic
scintillating crystals containing 6Li that have a large
capturing cross-section of thermal neutrons have been
extensively studied, and regarded as promising candidates of
replacing 3He proportional counters for neutron
detection. Quite a few high performance halide scintillating
crystals for neutron detection have been discovered and
developed, such as LiI:Eu, and elpasolite-structured crystals
like Cs2LiYCl6:Ce (CLYC) and
CsLiLaBr6:Ce (CLLB). Although
6LiI:Eu has high detection efficiency for thermal neutron, it
is difficult to handle due to its extremely high
hygroscopicity. CLYC and CLLB are capable of detecting and
discriminating γ-ray and neutron, but not ease of scaling up
due to incongruent melting nature. In this talk, I will
introduce three kinds of novel inorganic scintillators
developed in SICCAS: 1) 3 inch
NaI:Tl, 6Li single crystals
with decent gamma spectroscopy and n/γ discrimination
performance; 2) 6Li-loaded zero-dimensional perovskite
crystals with a compelling combination of a high stability
against moisture and oxygen, high light yield under gamma and
neutron irradiation, and a good neutron-gamma discrimination
capability; 3) self-assembled eutectics with tunable
microstructures toward neutron imaging. (Taken from the above web site) |
Quantum Beam Application Research A02 & B02
Joint Seminar
(36th RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Dr. TOYAMA, Yuichi (Muon Science and Engineering Research Center, Chubu University) |
| Title: | 「ピクセル型半導体検出器 MiniPIX の応用可能性 〜J-PARC におけるミュオン触媒核融合実験を中心に〜 (Applications of the pixel-type semiconductor detector MiniPIX—Focusing on muon-catalyzed fusion experiments at J-PARC)」 |
| Language: | Japanese |
| Date: | Augutst 29, 2022 (Mon.), 14:00–15:30 |
| Venue: | Hybrid (Online/Room 745, Science Complex B, Graduate School of Science, Tohoku University) |
Quantum Beam Application Research B03 Seminar
(37th RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Dr. FUKUCHI, Tomonori (RIKEN Center for Biosystems Dynamics ResearchLaboratory for Pathophysiological and Health Science) |
| Title: | 「多チャンネル検出器によるガンマ線直線偏光の測定 (Measurement of gamma-ray linear polarization with a multi-channel detector)」 |
| Language: | Japanese (Presentation slides in English) |
| Date: | August 3, 2022, 10:30 |
| Venue: | zoom |
| URL: | (Jpn) https://indico2.riken.jp/event/4174/ |
Quantum Beam Application Research A01 & B03
Joint Seminar
(36th RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Dr. KUMA, Susumu (Atomic, Molecular & Optical Physics Laboratory, RIKEN Cluster for Pioneering Research) |
| Title: | 「ナノ量子液滴における微視的超流動 (Microscopic superfluidity in quantum nanodroplets)」 |
| Language: | Japanese (Presentation slides in English) |
| Date: | May 27, 2022, 10:30 |
| Venue: | Hybrid (Online/RIKEN RIBF Bldg. Room 203) |
| URL: | (Jpn) https://indico2.riken.jp/event/4138/ |
Quantum Beam Application Research B03 Seminar
(35th RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Dr. YONEDA, Hiroki (RIKEN Nishina Center for Accelerator-Based Science) |
| Title: | 「コンプトン望遠鏡によるMeVガンマ線宇宙観測 (Observations of the MeV gamma-ray universe with Compton telescopes)」 |
| Language: | Japanese (Presentation slides in English) |
| Date: | April 27, 2022, 13:30 |
| Venue: | zoom |
| URL: | (Jpn) https://indico2.riken.jp/event/4105/ |
FY2021
Quantum Beam Application Research B03 Seminar
(34th RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Professor. TANIGAKI, Minoru (Kyoto University) |
| Title: | 「RI プローブによるウルトラファインバブルの内部圧力測定の試み (Internal pressure measurement of ultra fine bubbles using RI probe)」 |
| Language: | Japanese (Presentation slides in English) |
| Date: | September 22, 2021, 13:30 |
| Venue: | zoom |
| URL: | (Jpn) https://indico2.riken.jp/event/3860/ |
Quantum Beam Application Research B03 Seminar
(33rd RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Professor. ZHENG, Xu-Guang (Saga University) |
| Title: | 「水酸塩化物系における強誘電性/水素・重水素ダイナミックスと応力発光材料におけるミュオン実験 (Ferroelectricity/hydrogen･deuterium dynamics in hydroxyl salts and muon experiments on stress-luminescent materialFerroelectricity/hydrogen･deuterium dynamics in hydroxyl salts and muon experiments on stress-luminescent material)」 |
| Language: | Japanese |
| Date: | July 15, 2021, 10:30 |
| Venue: | zoom |
| URL: | (Jpn) https://indico2.riken.jp/event/3794/ |
FY2020
Quantum Beam Application Research B03 Seminar
(32nd RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Professor. SHIKANO, Yutaka (Keio University) |
| Title: | 「弱測定の基礎と応用 (Fundamentals and applications of weak measurement)」 |
| Language: | Japanese |
| Date: | February 4, 2021, 10:30 |
| Venue: | zoom |
| URL: | (Jpn) https://indico2.riken.jp/event/3662/ |
Quantum Beam Application Research A02 Seminar
(Tohoku University Experimental Nuclear and Particle Physics Seminar)
| Speaker: | Prof. OKADA, Shinji (Chubu University) |
| Title: | 「超伝導転移端センサーが拓く量子ビーム実験 (Quantum beam experiments pioneered by superconducting transition edge sensor)」 |
| Language: | Japanese |
| Date: | January 8, 2021, 14:40–16:10 |
| Venue: | zoom |
Quantum Beam Application Research B03 Seminar
(31st RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Dr. LASSEN, Jens (TRIUMF) |
| Title: | “Radioactive ion beams at TRIUMF using the resonance ionization laser ion source” |
| Language: | English |
| Date: | September 2, 2020, 13:30 |
| Venue: | zoom |
| URL: | (Eng) https://indico2.riken.jp/event/3469/ |
| Abstract: |
TRIUMF Canada's particle accelerator centre—formerly known
as Canada's National Laboratory for Nuclear and Particle
Physics currently operates a radioactive ion beam (RIB)
facility called ISAC. This isotope separator and accelerator
facility uses up to 100 μA of 480 MeV protons as a driver on
thick targets to produce radioactive isotopes. These isotopes
are ionized, extracted, mass separated and delivered directly
to experiments as low energy beams. Alternatively, the RIB
can be post accelerated by conventional accelerators to
medium energies (<1.8 MeV/u), or by a set of
superconducting linacs to high energy (<16.5 MeV/u). There is a current facility expansion under way, that aims at turning the RIB program into a true multi user facility, to allow better utilization of the detectors and facilities installed at ISAC. This upgrade will add a photofission target station, and later a second proton target station, to eventually allow the delivery of up to 3 independent RIB's to experiments. I will concentrate on the current RIB production and TRILIS, the TRIUMF resonant ionization laser ion source. In a typical operating year from April-December about 3000h of high intensity RIB beam delivery is achieved. About 70% of these high intensity RIB beam delivery involves the laser ion source. On average isotopes from 13 different elements are scheduled for the laser ion source - therefore operational aspects, as well as developments towards higher intensities, greater variety of elements laser ionized and increased beam purity will be discussed. TRILIS only uses solid state lasers. Since the fist laser ionized beam in 2004, ionization schemes for more than 40 different elements have been developed and isotopes of these have been delivered. As laser resonance ionization is the only element selective ionization method also “in source” laser spectroscopy will be discussed. The talk will end with an outlook into the future, multi beam RIB operation scenario. (Taken from the above web site) |
FY2019
Quantum Beam Application Research B03 Seminar
(30th RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Dr. YAMASHITA, Daiki (Quantum Optoelectronics Research Team, RIKEN Center for Advanced Photonics) |
| Title: | “Er-implanted silica lasers based on Si nanobeam cavities” |
| Language: | Japanese |
| Date: | February 27, 2020, 13:30 |
| Venue: | Room 210, RIKEN Nishina Memorial Bldg. |
| URL: | (Eng) https://indico2.riken.jp/event/3356/ |
| Abstract: |
Silicon (Si) photonics is a promising technology for
integrating optical and electronic components onto a single
microchip, which utilizes standard semiconductor
processes. Various key elements such as waveguides,
demultiplexers, modulators, and photodetectors have already
been integrated on chips. In comparison, the development of
practical Si-based lasers has been very challenging, because
Si has an indirect band gap, which results in low light
emission efficiency. In the last half a century, numerous
studies have been made to increase light emission from
Si. Among such studies, erbium (Er) ion doping has been found
to generate radiative transitions around 1.5 mm optical
communication wavelength. Nevertheless, light emission from
Er-doped Si at room-temperature is too weak to achieve lasing
operation. To overcome the problem, light emission has thus
focused on the use of SiO2 as a host material for doping Er
ions and microcavities with high-qulity (Q) factor to enhance
light emissions. The Er-implanted silica lasers have been
demonstrated by using high-Q toroidal cavities and
microdisk cavities. These achievements are important
steps towards practical Si-based lasers, however, these
device fabrication seem to be difficult in terms of
connections to waveguides and etching conditions. Moreover,
due to the small emission cross section of Er at 1.55 mm (
s = 4×10–21 cm2), lasing
operation requires cavities with Q >
1×105. Therefore, more robust device and
fabrication designs are desirable. Here, we propose the Er-implanted silica lasers based on Si nanobeam cavities. We utilize photonic crystal (PC) nanobeam cavities to enhance light emission from Er ions. PC nanobeam cavities have the advantages of high-Q factor (∼1×105) and ultrasmall mode volume (0.02 (λ/n)3, λ wavelength, n: refractive index), which can further improve the performance through the Purcell effect that accelerates the radiative decay into the cavity mode. The device design and laser operation principles are explained in the following. The devices are fabricated from silicon-on-insulator wafers and Er ions are implanted into the buried oxide layer. The Er ions are excited by external excitation laser and the generated light is coupled to the nanobeam cavity designed on the top Si layer. The light emission is enhanced in the nanobeam cavity and lasing begins. Using finite difference time domain simulations, we design cavities that enable efficient coupling to Er ions light emission and calculate lasing threshold conditions with two types of nanobeam cavities. This work is supported in part by MIC (SCOPE 191503001), MEXT (Nanotechnology Platform) and RIKEN (Incentive Research Project). Simulations are performed by HOKUSAI at RIKEN. (Taken from the above web site) |
Quantum Beam Application Research B03 Seminar
(29th RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Dr. AOKI, Takatoshi (The University of Tokyo) |
| Title: | 「極低温 Fr 原子を用いたパリティ非保存効果誘起の光シフトの研究： 標準模型を超えた新物理と核のアナポールモーメント (Study of light shift induced by parity-nonconservation effect using ultracold Fr atoms: new physics beyond the Standard Model and nuclear anapole moment)」 |
| Language: | Japanese |
| Date: | December 20, 2019, 13:30–15:00 |
| Venue: | Room 203, RIKEN RIBF bldg. |
| URL: | (Jpn) https://indico2.riken.jp/event/3162/ |
Quantum Beam Application Research A01 & B03 Joint Seminar
(28th RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Dr. NAGATA, Yugo (Tokyo University of Science) |
| Title: | 「静周期磁場によるポジトロニウム超微細構造の観測実験 (Observation of positronium hyperfine structure utilizing a static periodic magnetic field)」 |
| Language: | Japanese |
| Date: | November 5, 2019, 13:30–15:00 |
| Venue: | Room 203, RIKEN RIBF bldg. |
| URL: | (Jpn) https://indico2.riken.jp/event/3162/ |
Quantum Beam Application Research A02 Seminar
| Speaker: | Dr. ISHIKAWA, Takatsugu (Research Center for ELectron PHoton Science (ELPH), Tohoku University) |
| Title: | 「GeV 光子ビームラインの整備と光子標識化装置の開発 (Development of a GeV-photon beamline and photon-tagging system)」 |
| Language: | Japanese |
| Date: | August 7, 2019, 10:00 |
| Venue: | Room 745, Science Complex B, Graduate School of Science, Tohoku University |
| URL: | (Jpn) https://lambda.phys.tohoku.ac.jp/QBSeminar20190807/ |
The 40th NCC Young Researchers Seminar
| Speaker: | Dr. TAKEDA, Shin'ichiro (Kavli IPMU, the University of Tokyo) |
| Title: | “The development of a high performance semiconductor SPECT scanner for medical use” |
| Language: | Japanese |
| Date: | August 5, 2019, 17:30 |
| Venue: | Seminar Room 1, Exploratory Oncology Research and National Cancer Center |
| Poster: |
download (PDF)
|
| Abstract: | Currently, radionuclide therapy using alpha emitters is attracting strong attention in the field of oncology and the evaluation of biodistribution of small amount of radionuclides is needed to successfully perform this therapy. As we have been engaged in the development of high performance detectors for cosmic rays by using CdTe semiconductor detectors, we are now considering to translate this technology to medical use. |
Quantum Beam Application Research B03 Seminar
(27th RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Dr. FUJIYAMA, Shigeki (RIKEN Condensed Molecular Materials Laboratory) |
| Title: | 「計算機を活用した固体 NMR の解析法 (Analysis method of solid state NMR using computer)」 |
| Language: | Japanese |
| Date: | July 24, 2019, 13:30–15:00 |
| Venue: | Room 203, RIKEN RIBF bldg. |
| URL: | (Jpn) https://indico2.riken.jp/event/3105/ |
FY2018
Quantum Beam Application Research A02 Seminar
| Speaker: | Prof. FUJIOKA, Hiroyuki (Tokyo Tech) |
| Title: | 「η' 中間子原子核の 実験的研究を通じて η' 中間子の質量の正体に迫る (Elucidation of the mass of η' mesons through experimental study of η' mesons)」 |
| Language: | Japanese |
| Date: | March 29, 2019, 10:30–12:00 |
| Venue: | Room 745, Science Complex B, Graduate School of Science, Tohoku University |
Quantum Beam Application Research B03 Seminar
(26th RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Prof. TANAKA, Minoru (Osaka University) |
| Title: | 「同位体シフトで探る素粒子の新しい相互作用 (A new interaction of elementary particles explored by isotope shift)」 |
| Language: | Japanese |
| Date: | January 24, 2019, 14:00–15:30 |
| Venue: | Room 203, RIKEN RIBF Bldg. |
| URL: | (Jpn) https://indico2.riken.jp/event/2971/ |
Quantum Beam Application Research A02 Seminar
| Date: | December 3 (Mon.), 2018, 10:00–11:30 |
| Venue: | Multi-purpose room, Science Complex C, Graduate School of Science, Tohoku University |
| URL: | (Jpn) https://lambda.phys.tohoku.ac.jp/QBSeminar20181203/index.html (Eng) https://lambda.phys.tohoku.ac.jp/QBSeminar20181203/index_en.html |
| Language: | English |
| Speaker: | Dr. HERRMANN, Philipp (Institut für Kernphysik, Johannes Gutenberg-Universität, Mainz） |
| Title: | “Beam transport line spectrometer setup and systematics” |
| Abstract: | The Mainz Microtron MAMI delivers an electron beam of up to 1.6 GeV. The absolute energy is measured inside the third stage of the accelerator with an accuracy of δEbeam = 160 keV independent of the beam energy, with an energy spread σbeam < 13 keV and long-term drifts of less than 1 keV when stabilized. To obtain an absolute energy measurement within δEbeam ∼ 20 keV uncertainty, a 41, 82°-dipole of the beam-line leading to the spectrometer facility is used as a high-accuracy beam spectrometer. A high-precision field mapping device was developed and a dedicated beam detection system of RF cavity position monitors and YAG:Ce screens was implemented. Therefore the goal was to achieve 10 μT, 10 μm uncertainties in the field mapping and an electron beam deflection angle measurement with δθ/θ < 10–5. In this presentation the results and difficulties will be presented, in regard to providing a well-known incident particle energy for scattering experiments at MAMI. These results will be used to further advance the efforts in measuring the Lambda separation energy at the A1 group at MAMI. Therefore a new Lithium production target is designed and tested. The status of this development will be presented in the second part. |
| Speaker: | Dr. KLAG, Pascal (Institut für Kernphysik, Johannes Gutenberg-Universität, Mainz） |
| Title: | “Revealing experimental instabilities and improvements in the optics for undulator interferometry” |
| Abstract: | We have progressed a new hypernuclear spectroscopy at Mainz Microtron MAMI. To obtain a small systematics with the hypernuclear data, precise beam energy measurement with an accuracy of ∼20 keV is important. We have developed a new technique to measure the beam energy by undulator's radiation. A beamtime has been performed, that was dedicated to systematic effects of the energy measurement by undulator interferometry. The analysis of the data revealed that a combination of the moving stage, optics, the magnetic field and the stabilization of the electron beam acted as sources for deviations from a distortion-free signal. The presentation will cover some of the results. |
| Speaker: | Prof. Dr. ACHENBACH, Patrick (Institut für Kernphysik, Johannes Gutenberg-Universität, Mainz） |
| Title: | “Precision Physics with PRISMA from MAMI to MESA” |
| Abstract: |
PRISMA is an Excellence Cluster in Germany dedicated to research into
basic questions about the nature of the fundamental building blocks
of matter and their importance for the physics of the Universe. The
Cluster is funded by the German Research Foundation (DFG) and the
State of Rhineland Palatinate. PRISMA consists of research groups in
the areas of astroparticle, high-energy, and hadron physics, nuclear
chemistry and precision physics with ultra-cold neutrons and ion
traps. One of the main goals of PRISMA is to realize new key
experiments to study the fundamental forces and limits of the
Standard Model. With MESA —the Mainz Energy-Recovering Superconducting Accelerator— very high electron-beam luminosities on internal targets will be reached at low energies. MESA will be the first accelerator to investigate multiturn energy recovery in a superconducting environment. Several key experiments are currently designed to perform precision determinations of Standard Model parameters, measurements of electromagnetic form factors in electron-proton scattering, searches for new weakly interacting particles, and studies relevant for nuclear astrophysics. (Taken from the above web site) |
Quantum Beam Application Research A02 Seminar
| Speaker: | Dr. HASHIMOTO, Tadashi (Advanced Science Research Center, JAEA) |
| Title: | 「J-PARCのハドロン実験における低温標的の開発 (Development of cryogenic targets for hadron experiments at J-PARC)」 |
| Language: | Japanese |
| Date: | October 12, 2018, 15:00–16:30 |
| Venue: | Multi-purpose room, Science Complex C, Graduate School of Science, Tohoku University |
Quantum Beam Application Research B03 Seminar
(25th RIKEN Nuclear Spectroscopy Lab. Seminar)
| Speaker: | Dr. WATANABE, Shin (ISAS, JAXA) |
| Title: | 「Si/CdTe 半導体コンプトンカメラの開発研究と高感度 MeV ガンマ線観測実現に向けた展望 (R&D research of Si/CdTe semiconductor Compton camera and prospect for realization of high sensitivity MeV-gamma-ray observation)」 |
| Language: | Japanese |
| Date: | September 27, 2018, 13:30–15:00 |
| Venue: | Room 203, RIKEN RIBF Bldg. |
| URL: | (Jpn) https://indico2.riken.jp/event/2868/ |