Why our Universe was bone and how it developed into the present state?
Since its birth at the Big Bang, the Universe has experienced various drastic events.
Because the Universe is not a stable object, we have to understand and explain the present state as a consequence of dynamical processes the Universe has experienced.
Though many events in the History of the Universe have been clarified, many pieces are still missing to understand our Universe today.
Toward this goal, the center has established the following four research divisions:
- 2024/03/15 Workshop by the Division of Elementary Particles
TCHoU Workshop of AY 2023 on Particle Physics, organized by the Division of Elementary Particles, is held as follows. This workshop is free to access. Talks are given in Japanese.
- Date: March 15 (Fri), 2024 13:30-18:00
- Venue: B118, Natural Sci. Bldg. B, Univ. Tsukuba
- Program:
-
Contact: Asso.Prof. Y. Takeuchi
- 2024/01/19 HoU seminar
- Date: Jan. 19, 2024 (fri) 13:15-15:30
- Venue: B118, Natural Sci. Bldg. B, Univ. Tsukuba
- Speaker1: Tsutomu Mibe (KEK, Inst. Particle and Nuclear Studies)
- Title1: "Achievement through cooling and acceleration! New Experiment to Accurately Measure Muon g-2 and EDM"
- The anomalous magnetic moment (g-2) and electric dipole moment (EDM) of muons are powerful means of studying unknown particle physics laws, as they can manifest physics phenomena beyond the Standard Model through quantum effects. In conventional measurement methods, the quality of the muon beam constitutes a significant systematic error, and there is a demand to improve this for the next-generation experiments significantly. We have achieved an extremely low emittance "ultracold muon beam" by cooling and accelerating muons, introducing a new experimental approach that eliminates traditional limitations. This allows for the precise measurement of the anomalous magnetic moment (g-2) and electric dipole moment (EDM) of muons. In this seminar, we will provide an overview of the recent developments surrounding g-2 and introduce the preparation status of the experiment.
- Speaker2: Takayuki Yamazaki (KEK, Inst. Particle and Nuclear Studies)
- Title2: "The Past and Future of the J-PARC Muon H-Line"
- At the J-PARC high-intensity proton accelerator facility in Tokai Village, Ibaraki Prefecture, a high-intensity proton beam with an energy of 3 GeV and a beam power of 1 MW is irradiated onto a graphite target. The muons generated by the decay of charged pions produced in nuclear fragmentation reactions are utilized for a wide range of research, spanning from material science to particle physics. The J-PARC Muon Science Experimental Facility, which started operating its first beamline (D-line) in September 2008, expanded with the addition of the U-line in 2012, the S-line in 2017, and the H-line in 2022, each providing distinct muon beams. The H-line introduced in this seminar is a beamline where the world's highest-intensity positive and negative pulse muons are available. In the experimental area at the first branching point (H1 area), fundamental physics experiments requiring high-intensity muon beams, such as precision spectroscopy of muonium (a hydrogen-like atom composed of a positive muon and an electron) and exploration experiments of muon-electron conversion processes, are conducted. Furthermore, the construction of the second branching point in the H-line is underway to generate an "ultracold muon beam" with extremely low emittance through muon cooling and reacceleration. This ultracold muon beam is not only applicable to muon g-2/EDM experiments but is also used in the transmission-type muon microscope (TμM), enabling the observation of thick samples. In this seminar, we will provide an overview of the J-PARC Muon H-line, its construction history, and prospects for the future.
- Number of participants: on-site 17 + online 6
Contact: Assi.Prof. T. Iida
- 2023/12/18 TCHoU Research Member Meeting / Activity and Achievement Reports
We had a research workshop to share achievements, exchanging activities and future projects for all members of TCHoU.
- Date: 27 June 2023 (mon) 9:00-17:00
- Venue: B114, Natural Science Bldg. B, Univ. Tsukuba
- Program:
- Click on the title for presentation slides.
- Number of participants: about 30
Contact: Prof. S. Esumi
- 2023/11/29 HoU seminar
- Date: Nov. 29, 2023 (wed) 13:30-14:30
- Venue: B118, Natural Sci. Bldg. B, Univ. Tsukuba
- Speaker: Baltasar Vila-Vilaro (ALMA Observatory)
- Title1: "Properties of the ISM of Spiral Galaxies along the Hubble Sequence"
- The properties of the atomic and molecular ISM of normal spiral galaxies along the Hubble sequence will be reviewed. Special emphasis will be placed on trends of some specific tracers of the molecular ISM as a function of Hubble type, and their implications. Results of several recent single-dish surveys of the molecular ISM in nearby spiral galaxies will be presented.
Contact: Assi.Prof. T. Iida
- 2023/11/21 HoU seminar
- Date: Nov. 21, 2023 (tue) 16:00-17:00
- Venue: 1F201, Bldg. 1F of Area 1, Univ. Tsukuba
- Speaker: Prof. Dr. Qiye Shou (Fudan University)
- Title: "Recent activities of the ALICE Shanghai group"
- Joining the LHC-ALICE experiment since 2019, Fudan University (Shanghai group) is one of the four institutes in China. Our current physics interests are primarily on the study of exotic phenomena and matters. In this talk, first I'll generally introduce the group, and then summarize some of the research highlights we have achieved in recent years, including the charge dependent correlations, femtoscopic correlations, and the study of the hypertriton. The future plans to contribute to ALICE and promote collaborations with international colleagues will be discussed as well.
Qiye Shou is a tenured associate professor at Fudan University. He received his Doctor of Science degree in 2015 from the Shanghai Institute of Applied Physics (SINAP). After completing the postdoctoral research at CCNU and serving as an assistant professor at SINAP, he joined Fudan University in 2019. His primary research focuses on heavy-ion collisions, studying the properties of the Quark-Gluon Plasma (QGP), such as anomalous chiral effects, collectivity and exotic particles. He has previously worked on the RHIC-STAR experiment and currently works on the LHC-ALICE, serving as the (deputy) leader of the ALICE Shanghai group, the flow PAG coordinator and the contact person of the China T2 cluster.
Contact: Prof. S. Esumi
- 2023/11/17 HoU seminar
- Date: Nov. 17, 2023 (fri) 13:15-15:00
- Venue: B118, Natural Sci. Bldg. B, Univ. Tsukuba
- Speaker1: Katsuro Nakamura (KEK, Inst. Particle and Nuclear Studies)
- Title1: "Exploring New Physics at the Belle II experiment"
- One of the main goals of the Belle II experiment is to explore new physics beyond the Standard Model of particle physics. The Belle II experiment started full-scale data acquisition 2019 and has already collected 424fb^-1 of data, which have been used for the study of the decays of B mesons, D mesons, tau leptons and the search for the dark sector. This presentation will provide an overview of the Belle II experiment, covering the performance of the detectors and data acquisition, as well as presenting the latest analysis results.
- Speaker2: Takashi Mori (KEK, Accelerator Laboratory)
- Title2: "Challenges of unprecedented beam collision performance with SuperKEKB accelerator"
- SuperKEKB is a collider with a circumference of 3 km, located 11 meters below the ground level. Electrons and positrons are accelerated to the energies of 7 billion and 4 billion electron volts, respectively, in a linear accelerator and they are injected into two circular rings in opposite directions. A figure of merit for accelerator performance is described by “luminosity” (L), the collision frequency of particles. The KEKB accelerator, the accelerator that preceded SuperKEKB, reached the world record of L=2.11×1034cm-2s-1, and the target L of SuperKEKB is 6×1035cm-2s-1. To reach the target value, “nano-beam scheme” was adopted to SuperKEKB for the first time in the world in addition to the beam current increase in design, and extreme fine beam operation has been being performed. In this seminar, we will introduce the general features of SuperKEKB first, and then describe the individual accelerator components and challenges. Furthermore, we will talk about the prospects of the SuperKEKB upgrade.
- Number of participants:about 20
Contact: Assi.Prof. T. Iida
- 2023/11/4-5 Exibition at Campus Festival "Soho-Sai" of Univ. of Tsukuba
An exposition introducing the research activities of the Tomonaga Center was made at the Campus Festival "So-Ho Sai" of the Univ. of Tsukuba.
- Date: 4(Sun)-5(Mon) Nov 2023
- Venue: 3B401, Univ. Tsukuba
- Thema: "Clarification of the History of Universe"
- 2023/10/14 Y. Imamura received Student Presentation Award of the Physical Society of Japan
Master Course student Yuka Imamura, supervised by Asso.Prof. Y. Takeuchi, Dr. K. Hara, and Assi.Prof. K. Nakamura (KEK) (Div. of Elementary Particles), received the Student Presentation Award of the Physical Society of Japan for his presentation at the 78th annual meeting of JPS at Sendai.
- "Research and development of Radiation-Hard LGAD detector"
- 2023/10/14 T. Omori received Student Presentation Award of the Physical Society of Japan
Master Course student Takumi Omori, supervised by Assi.Prof. T. Iida (Div. of Elementary Particles), received the Student Presentation Award of the Physical Society of Japan for his presentation at the 78th annual meeting of JPS at Sendai.
- "Double Beta Decay Search for Gd-160 by PIKACHU Experiment 5 - Development and performance evaluation of the high purity GAGG crystal for PIKACHU experiment -"
See also TSUKUBA JOURNAL of the Univ. Tsukuba.
- 2023/09/29 HoU seminar
- Date: Sept. 29, 2023 (fri) 13:45-15:15
- Venue: B114, Natural Sci. Bldg. B, Univ. Tsukuba
- Speaker: Sotaro Kanda (KEK)
- Title: "Precise measurements using muons: from spectroscopy to interferometry"
- The muon is a subatomic particle classified as a second-generation charged lepton, possessing the same charge, -e, and spin 1/2 as an electron. It is 200 times heavier than an electron and is an unstable particle decaying with an average lifetime of 2.2 microseconds. While it is applied as a local magnetic probe in materials and life science, its intrinsic properties are an intriguing subject of particle physics. In pursuing physics beyond the Standard Model, precise measurements and searches of rare processes involving muons have yielded important results. A significant factor behind this is the improvement in beam intensity due to advancements in accelerator technology. The pulsed muon beam at J-PARC MLF MUSE achieves the world's highest intensity, enabling numerous experiments previously deemed challenging. Precision measurements using a high-intensity pulsed beam require improvement in particle detectors and beam cooling techniques. This talk will discuss muon precision measurements using high-intensity beams, specifically the spectroscopy of atomic systems involving muons, a new measurement of the muon lifetime, and muonium interferometry with beam cooling.
- Number of participants:about 20
Contact: Assi.Prof. T. Iida
- 2023/09/28 Tomonaga Center Intanational Workshop "Origin and Evolution of the Universe, Matter and Life"
The international workshops was held as an event commemorating the 50th anniversary of University of Tsukuba. In addition to introducing the activities of the center, we invited people who are active in related fields in Japan and overseas to give lectures.
- Date: Sept. 28, 2023 (thu) 09:30-17:00
- Venue: International Conference Room, University Hall, University of Tsukuba
- URL: https://hep-www.px.tsukuba.ac.jp/TCHoU/symposium2023/
- Program: (Click on the title for presentation slides.)
- Number of participants: 47
Contact: Prof. N. Kuno
- 2023/09/20 Assi. Prof. Hashimoto made a press release on the most distant cluster of primordial galaxies
Assistant Professor Takuya Hashimoto (Division of the Antarctic Astronomy) held a press conference ”The Strongest Tag Team of the James Webb Space Telescope and ALMA Telescope Succeeded in Capturing the Most Distant Cluster of Primordial Galaxies” at the 2023 Fall Meeting of the Astronomical Society of Japan.
For more details, see the press release article and a web announcement of the Univ. of Tsukuba.
- 2023/08/08 N. Suzuki received Excellent Poster Award of SMART2023
Doctor Course student Naoki Suzuki, supervised by Assi.Prof. T. Iida (Div. of Elementary Particles), received the Excellent Poster Award at SMART2023, in which developments and applications of radiation detectors are discussed.
See also TSUKUBA JOURNAL of the Univ. Tsukuba.
- 2023/08/03 HoU seminar
- Date: Aug. 3, 2023 (thu) 15:15-16:30
- Venue: B114, Natural Sci. Bldg. B, Univ. Tsukuba
- Speaker: Masao YOSHINO (Tohoku Univ.)
- Title: "Radiation detectors and radiation imaging using single-crystal scintillators"
- Scintillators convert radiation into UV to visible light. They play an essential role as sensor heads in radiation detectors in underground particle experiments and in the field of high-energy physics. This talk focuses in particular on inorganic scintillator single crystals, such as oxides and halides, and describes the scintillation properties imparted by their crystal growth methods and growth processes. Furthermore, the latest trends in scintillation detectors in recent years will be discussed.
- Number of participants: about 20
Contact: Assi.Prof. T. Iida
- 2023/07/08 Tanabata Lecture of Astronomy
Lectures by astronomers will be held near Tanabata Day. The state-of-the-art research content will be explained in an easy-to-understand manner to the general public. (in Japanese)
Click on the poster for details.
- Date: 9 July 13:30-16:30
- Venue: Tsukuba International Congress Center EPOCHAL, Conference room 101
- Program:
13:30- | |
Toshiki Saito | (National Astronomical Observatory of Japan) |
All galaxies are a lion at home and a mouse abroad ~The true appearance of the galaxy revealed by large radio telescope~ |
15:00- | |
Hidenobu Yajima | (Univ. Tsukuba) |
Histroy of universe approaching with super computer |
16:30 | |
| End |
|
- Target: General public (junior high school students and above)
- Participation fee: Free (max. 130 people)
Contact: Prof. N. Kuno (TEL: 029-853-5080, e-mail: kuno.nario.gt [at] u.tsukuba.ac.jp)
- 2023/07/06 Assi.Prof. Iida received "2023 Japan Isotope Association Incentive Award"
As announced by our news of 2023/03/03, Takashi Iida, Assistant Professor at TCHoU, received the 2023 Japan Isotope Association Incentive Award on 6 July at the 60th meeting of the Japan Isotope Association for his contribution to the advancement of particle science through the development of detection methods for weak radiation.
Title: "Advancement of Detection System for the Study of Extremely Rare Decays of 48Ca"
See also TSUKUBA JOURNAL of the Univ. Tsukuba.
- Visit [Archive] for previous news and announcements.