We are developing a new nuclear database for muon-induced nuclear reactions (muon nuclear data, muND). The database will consist of following four sub-libraries. Outline of the muon nuclear data is found in our publication.
When a negatively charged muon stops in matter, it forms a highly-excited atomic state with the nucleus, known as a muonic atom. The excited muonic atom promptly cascades down to the atomic ground (1s) state by emitting Auger electrons and muonic X rays. Currently X-ray spectra of several targets are availlable in JINR's Mesoroentgen Spectra Catalogue. The energy of muonic X-ray can be calculated by Mudirac code.
The muon in the muonic atom at the 1s state decays via two processes: decay-in-orbit and nuclear muon capture. The lifetime of the muonic atom is an inverse of the muon nuclear capture rate. Most of previous investigations were summarized in T. Suzuki et al., Phys. Rev. C 35, 2212.
The muon nuclear capture reaction populates the excited nucleus, which decays via particle emissions, such as neutron, proton, deuteron, and alphas. Currently very limited spectra have been measured so far. We have developed new charged particle detection system ( Kawase et al., Nucl. Instrum Methods A1059, 168984 (2024)), and start systematic measurements of energy spectra of charged particles.
Production branching ratios of the reaction residues were mesured mainly activation method and prompt γ-ray measurements. We have developed new method of in-beam activation for measurement of short-lived radio-isotopes with the activation method (M. Niikura et al., Phys. Rev. C 109, 014328 (2024)). Several mearuements using this method are on-going.
Update informations.
RIKEN Nishina Center
Researcher
JAEA
Researcher
RAL-ISIS
Researcher
JAEA
Researcher
RAL-ISIS
Researcher
KEK
Accociate professor
Kyushu Univ.
Assistant professor
RIKEN Nishina Center
Researcher
Kyushu Univ.
Accociate professor
Univ. of Tokyo
PhD student
Osaka Univ.
Assistant proffesor
Kyushu Univ.
Professor
JAEA
Researcher
© Copyright Transmutation data research group, RIKEN Nishina Center All Rights Reserved