Fine structure of beta decay end point spectrum

Samina S. Masood, Salah Nasri, Joseph Schechter

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


We note that the fine structure at the end point region of the beta decay spectrum is now essentially known using neutrino oscillation data, if the mass of one neutrino is specified. This may help to identify the effects of nonzero neutrino masses in future experiments. We also give a compact description of the entire range of allowed neutrino masses as a function of the third neutrino mass, m3. A three neutrino assumption is being made. An exact treatment of phase space kinematics is used, in contrast to the conventional approximate formula. This work is independent of theoretical models; however, additional restrictions due to the assumption of a "complementary ansatz" for the neutrino mass matrix are also discussed. The ansatz implies that the values of the three neutrino masses should approximately be able to form a triangle. It is noted that most of the presently allowed neutrino mass sets have this triangular property.

Original languageEnglish
Pages (from-to)517-531
Number of pages15
JournalInternational Journal of Modern Physics A
Issue number3
Publication statusPublished - Jan 30 2006
Externally publishedYes


  • Complementary ansatz
  • Neutrino masses
  • Neutrino oscillation constraints
  • Tritium beta decay

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics


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