| March 24 of 2026 year, 10:30 |
Davydov Yuri Ivanovich
(JINR, Dubna) |
Development of precision wire detectors and installation for muon decay study.
Abstract:
TWIST experiment (TRIUMPH, Vancouver, Canada), aimed to measure
with record accuracy of Michel ρ, δ and Pµ parameters ξ in positive decays
muons. To achieve this goal, it was necessary to create a spectrometer with a high
geometric accuracy and measure the energy of decay positrons with relative
accuracy at a level better than 10-3.
The report examines the methodology for creating wire detectors and
features of the TWIST spectrometer. Data analysis and evaluation methods discussed
systematic errors in determining Michel parameters. Obtained parameters
Michel's accuracy was about an order of magnitude superior to pre-existing results
and entered Particle Data Group data.
|
| March 10 of 2026 year, 10:30 |
Dr. Bing Liu (Head of the p-B Fusion Reaction Group) and
Dr. Zhi Li, Research Engineer, p-B Fusion Reaction Group
(ENN Science & Technology Development Co., Ltd, China) |
Significance and challenges of nuclear spin polarization in proton‑boron fusion.
Abstract:
ENN Energy Research Institute, an affiliate of ENN Group,
has been dedicated to research on spherical torus (ST)
proton-boron (p-¹¹B) fusion energy since 2017. Using two
generations of spherical torus fusion experimental devices
(EXL-50, EXL-50U), ENN has enabled rapid iteration in both
theoretical and engineering fields. This presentation will
highlight recent progress, introduce the concept of achieving
ignition in p-¹¹B fusion with the assistance of nuclear spin
polarization, and analyze the key challenges and difficulties
associated with this approach. In addition, a collaborative
experiment will be proposed to carry out the first measurement
of the polarized p-¹¹B reaction in the low-energy region.
|
| March 3 of 2026 year, 10:30 |
A.P. Serebrov
(NRC Kurchatov institute - PNPI) |
Baryonic and Leptonic Asymmetries of the Universe.
(Presentation)
|
26 February, 2026 year, 14:30,
Joint Seminar HEPD - TPD |
O.Yu. Andreev
(SPBSU & NRC KI - PNPI) |
Bound–bound muon transitions in muonic atoms with electron–positron pair production.
(Presentation)
Video
Abstract:
Bound–bound muon transitions in muonic atoms, accompanied by the production of electron–positron pairs, were studied. It was shown that for ions with a nuclear charge of Z ≥ 24, transitions of bound muons from low-lying excited states to the 1s ground state can lead to the production of electron–positron pairs. It was found that the probability of such transitions for states with nonzero orbital angular momentum is determined primarily by the Breit interaction. It was also shown that, in general, pair production occurs predominantly through the decay of 2p states. Thus, the Breit interaction plays a key role in the process of electron–positron pair production in bound–bound muon transitions. This process opens a unique opportunity to study quantum electrodynamics in strong fields and also represents a little-studied class of non-radiative transitions accompanied by the production of electron-positron pairs.
|
| February 24 of 2026 year, 10:30 |
A.P. Serebrov
(NRC Kurchatov institute - PNPI) |
Precision studies of neutron decay and the need to expand the Standard Model.
(Presentation)
Video
|
| February 17 of 2026 year, 10:30 |
A.A. Dzyuba
(HEPD PNPI, NRC KI) |
LHCb results on measuring CP-impairment effects.
(Presentation)
Video
|
