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Title: Tritium β decay in chiral effective field theory

Journal Article · · Physical Review C
 [1];  [2];  [3];  [4];  [5];  [3]
  1. Old Dominion Univ., Norfolk, VA (United States)
  2. Univ. of Salento, Lecce (Italy); INFN-Lecce, Lecce (Italy)
  3. INFN-Pisa, Pisa (Italy)
  4. INFN-Pisa, Pisa (Italy); Univ. of Pisa, Pisa (Italy)
  5. Old Dominion Univ., Norfolk, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

We evaluate the Fermi and Gamow-Teller (GT) matrix elements in tritium $$\beta$$-decay by including in the charge-changing weak current the corrections up to one loop recently derived in nuclear chiral effective field theory ($$\chi$$ EFT). The trinucleon wave functions are obtained from hyperspherical-harmonics solutions of the Schroedinger equation with two- and three-nucleon potentials corresponding to either $$\chi$$ EFT (the N3LO/N2LO combination) or meson-exchange phenomenology (the AV18/UIX combination). We find that contributions due to loop corrections in the axial current are, in relative terms, as large as (and in some cases, dominate) those from one-pion exchange, which nominally occur at lower order in the power counting. Furthermore, we also provide values for the low-energy constants multiplying the contact axial current and three-nucleon potential, required to reproduce the experimental GT matrix element and trinucleon binding energies in the N3LO/N2LO and AV18/UIX calculations.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC05-06OR23177
OSTI ID:
1302044
Alternate ID(s):
OSTI ID: 1298338
Report Number(s):
JLAB-THY-16-2233; DOE/OR/23177-3778; arXiv:1605.01620; PRVCAN
Journal Information:
Physical Review C, Vol. 94, Issue 2; ISSN 2469-9985
Publisher:
APSCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 47 works
Citation information provided by
Web of Science

References (43)

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Cited By (7)

Status and future of nuclear matrix elements for neutrinoless double-beta decay: a review journal March 2017
From response functions to cross sections in neutrino scattering off the deuteron and trinucleons journal December 2019
Momentum space treatment of inclusive neutrino scattering off the deuteron and trinucleons journal July 2018
Uncertainties in constraining low-energy constants from 3H $ \beta$β decay journal August 2017
Nuclear matter properties from local chiral interactions with $Δ$ isobar intermediate states text January 2016
Light-nuclei spectra from chiral dynamics text January 2017
Momentum space treatment of inclusive neutrino scattering off the deuteron and trinucleons text January 2018

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