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Itahashi Lab (Nuclear Experiment)
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A nuclear experiment research group that explores the origin of matter in the universe through mesons and double beta decay.
AboutAbout the lab
Approaching the origin of matter through mesons and double beta decay
The Itahashi Group is a group within the Nuclear Experiment Lab. Through experiments using mesons, double beta decay, and more, it investigates the origin of the matter that makes up the universe.
The Nuclear Experiment Lab uses accelerators to create unstable nuclei and pionic atoms that do not exist in nature, and studies the properties of atomic nuclei.
The Itahashi Group has a hadron spectroscopy subgroup, which uses mesons to study the origin of the mass of matter and the structure of the vacuum, and an elementary particle and nuclear spectroscopy subgroup, which studies double beta decay and related topics.
The lab's website presents the group together with the Kawabata Group as the "Nuclear Experiment Lab."
Key terms
- chiral symmetry
- One of the symmetries studied in meson research. Experiments using pions showed that it is spontaneously broken in the present vacuum.
- Majorana particle
- A particle that is identical to its antiparticle. If the neutrino is one, particle-number conservation is violated.
- neutrinoless double beta decay
- A decay that occurs if the neutrino is a Majorana particle. Searching for it makes it possible to test the violation of particle-number conservation.
NewsLab news
Professor Itahashi's review article "Probing the Vacuum Structure of the Strong Interaction with Pions" was published in the journal of the Physical Society of Japan
Results from a project researcher's doctoral dissertation were published in Phys. Rev. Lett. and announced in a press release
Results from the doctoral dissertation of a lab alumnus (the binding energy of the hypertriton) were published in Phys. Lett. B
ResearchResearch themes
The Itahashi Group aims to elucidate the origin of the matter that makes up the universe through research using mesons and through elementary particle and nuclear spectroscopy research such as double beta decay. The lab's website presents it together with the Kawabata Group's research; this page covers this group's research.
*Illustrative imageExploring the Origin of Mass and the Structure of the Vacuum with Mesons
The lab studies quantum states in which a meson is bound to an atomic nucleus, measuring changes in the meson's mass and in its interaction with the nucleus. Using the pion, it obtained the world's first experimental result showing that chiral symmetry is spontaneously broken in the present vacuum.
*Illustrative imageProbing the Violation of Particle-Number Conservation with Double Beta Decay
If the neutrino is a Majorana particle, particle-number conservation is violated, and this can be tested by searching for neutrinoless double beta decay. The lab aims to discover a process that does not conserve particle number, using the CANDLES detector at the Kamioka underground laboratory.
MembersFaculty
The Nuclear Experiment Lab, to which the Itahashi Group belongs, consists of faculty, doctoral, master's, and undergraduate students, technical assistants, secretaries, and collaborators.As of 2026
- ProfessorKenta Itahashi
- Associate ProfessorSei Yoshida
- Assistant ProfessorSuguru Shimizu
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “ZEUS-Detektor 3D-Grafik” DESY-Kommunikation / CC BY-SA 4.0 (cropped)
- Exploring the Origin of Mass and the Structure of the Vacuum with Mesons: “K meson decay” Reculet / CC BY-SA 4.0 (cropped)
- Probing the Violation of Particle-Number Conservation with Double Beta Decay: “Schematic of the main JUNO detector” JUNO Collaboration: Angel Abusleme, Thomas Adam, Shakeel Ahmad, Rizwan Ahmed, Sebastiano Aiello, Muhammad Akram, Abid Aleem, Tsagkarakis Alexandros, Fengpeng An, Qi An, Giuseppe Andronico, Nikolay Anfimov, Vito Antonelli, Tatiana Antoshkina, Burin Asavapibhop, João Pedro Athayde Marcondes de André, Didier Auguste, Weidong Bai, Nikita Balashov, Wander Baldini, Andrea Barresi, Davide Basilico, Eric Baussan, Marco Bellato, Antonio Bergnoli, Thilo Birkenfeld, Sylvie Blin, David Blum, Simon Blyth, Anastasia Bolshakova, Mathieu Bongrand, Clément Bordereau, Dominique Breton, Augusto Brigatti, Riccardo Brugnera, Riccardo Bruno, Antonio Budano, Jose Busto, Ilya Butorov, Anatael Cabrera, Barbara Caccianiga, Hao Cai, Xiao Cai, Yanke Cai, Zhiyan Cai, Riccardo Callegari, Antonio Cammi, Agustin Campeny, Chuanya Cao, Guofu Cao, Jun Cao, Rossella Caruso, Cédric Cerna, Chi Chan, Jinfan Chang, Yun Chang, Guoming Chen, Pingping Chen, Po-An Chen, Shaomin Chen, Xurong Chen, Yixue Chen, Yu Chen, Zhiyuan Chen, Zikang Chen, Jie Cheng, Yaping Cheng, Yu Chin Cheng, Alexey Chetverikov, Davide Chiesa, Pietro Chimenti, Artem Chukanov, Gérard Claverie, Catia Clementi, Barbara Clerbaux, Selma Conforti Di Lorenzo, Daniele Corti, Flavio Dal Corso, Olivia Dalager, Christophe De La Taille, Zhi Deng, Ziyan Deng, Wilfried Depnering, Marco Diaz, Xuefeng Ding, Yayun Ding, Bayu Dirgantara, Sergey Dmitrievsky, Tadeas Dohnal, Dmitry Dolzhikov, Georgy Donchenko, Jianmeng Dong, Evgeny Doroshkevich, Marcos Dracos, Frédéric Druillole, Ran Du, Shuxian Du, Stefano Dusini, Martin Dvorak et al. (506 additional authors not shown) / CC BY 4.0 (cropped)
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