【Seminar @ IOP】April 16, 2025 (Wed.) 15:00_Prof. Jen-Chieh Peng - Inverse Tritium Beta Decay and Relic Neutrinos (fwd)

[Wen-Chen Chang]

---------- Forwarded message ----------
Date: Wed, 9 Apr 2025 08:48:28
From: colloquium-seminar <colloquiu...@phys.sinica.edu.tw>

時 間 (Time): April 16, 2025 (Wed.) 15:00

地 點 (Place): 七樓研討室 7F, P7A Seminar Room

演講者 (Speaker): Prof. Jen-Chieh Peng

所屬機構 (Institute): University of Illinois at Urbana-Champaign

題 目 (Title): Inverse Tritium Beta Decay and Relic Neutrinos

摘 要(Abstract):

Neutrinos in the early Universe decoupled essentially in helicity eigenstates. As they propagate through the Universe,
their helicities could be modified via two effects. First, neutrinos with a finite magnetic moment would rotate their
spins with respect to their momenta as they encounter cosmic magnetic fields, modifying their helicities. Second, the
bending of neutrino's spin by a gravitational field lags the bending of its momentum, again modifying its helicity. We
study both effects and investigate the implications of the helicity modification on the detection of relic neutrinos using
the Inverse Tritium Beta Decay (ITBD) reaction. We find that the ITBD rate depends sensitively on the neutrino mass
hierarchy and on the Dirac or Majorana nature of the neutrinos. We also discuss the concept of Macroscopic Neutrinoless
Double Beta Decay using ITBD as an example. Finally, we discuss the roles of angular momentum conservation in various
processes including ITBD. This talk is based on several recent papers in collaboration with Gordon Baym.

連 結 (Link): https://www.phys.sinica.edu.tw/lecture_detail.php?id=3033&eng=T

演講語言 (Language): in English

接待人 (Host): 吳建宏(Ng, Kin-Wang) 博士

聯絡人 (Contact): 藤末紘三 #27898388

 

 

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