Tritium decay in chiral effective field theory
- Old Dominion Univ., Norfolk, VA (United States)
- Univ. of Salento, Lecce (Italy); INFN-Lecce, Lecce (Italy)
- INFN-Pisa, Pisa (Italy)
- INFN-Pisa, Pisa (Italy); Univ. of Pisa, Pisa (Italy)
- 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
Web of Science
Similar Records
Comparative study of -decay based on different similarity-renormalization-group evolved chiral interactions
Local chiral interactions, the tritium Gamow-Teller matrix element, and the three-nucleon contact term