Search NASAโŒ• Search
Home/Archive/DOE OSTI

DOE OSTI ยท 3001787

Improved Tensor Current Limit from 8 B ๐›ฝ Decay Including New Recoil-Order Calculations

Longfellow, B.ยทGallant, A. T.ยทSargsyan, G. H.ยทBurkey, M. T.ยทHirsh, T. Y.ยทSavard, G.ยทScielzo, N. D.ยทVarriano, L.ยทBrodeur, M.ยทBurdette, D. P.ยทClark, J. A.ยทLascar, D.ยทLauney, K. D.ยทMueller, P.ยทRay, D.ยทSharma, K. S.ยทValverde, A. A.ยทWilson, G. L.ยทYan, X. L.
View original source โ†—Read source document โ†—Export metadata โ†“

Abstract

A precision measurement of the ๐›ฝ + decay of 8 B was performed using the Beta-decay Paul Trap to determine the ๐›ฝโˆ’๐œˆ angular correlation coefficient ๐‘Ž ๐›ฝโข๐œˆ . The experimental results were combined with new ab initio symmetry-adapted no-core shell-model calculations to yield the second-most precise measurement from Gamow-Teller decays, ๐‘Ž ๐›ฝโข๐œˆ = โˆ’0.3345 ยฑ 0.001โข9 stat ยฑ 0.002โข1 syst . This value agrees with the standard model value of โˆ’1/3 and improves uncertainties in 8 B by nearly a factor of 2. By combining results from 8 B and 8 Li , a tight limit on tensor current coupling to right-handed neutrinos was obtained. A recent global evaluation of all other precision ๐›ฝ decay studies suggested a nonzero value for right-handed neutrino coupling in contradiction with the standard model at just above 3โข๐œŽ. Finally, the present results are of comparable sensitivity and do not support this finding.

Explore related subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICSPhysics - Nuclear physics and radiation physicsab initio calculationsbeta decaynuclear tests of fundamental interactionsradioactive beamstrapped ions

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Longfellow, B., Gallant, A. T., Sargsyan, G. H., Burkey, M. T., Hirsh, T. Y., Savard, G., Scielzo, N. D., Varriano, L., Brodeur, M., Burdette, D. P., Clark, J. A., Lascar, D., Launey, K. D., Mueller, P., Ray, D., Sharma, K. S., Valverde, A. A., Wilson, G. L., Yan, X. L.. 2024-04-03. Improved Tensor Current Limit from 8 B ๐›ฝ Decay Including New Recoil-Order Calculations. https://doi.org/10.1103/physrevlett.132.142502

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

DOE OSTI2026

Design-informed neutronics assessment of long-lived fission product transmutation in a tokamak fusion reactor blanket

This study presents a neutronics-based assessment of the feasibility and viability of transmuting six major long-lived fission products (LLFPs) from light-water reactors, namely 99 Tc, 129 I, 79 Se, 93 Zr, 126 Sn, and 135 Cs, within the blanket region of a tokamak fusion reactor, using the MIT ARC design as a concrete fusion configuration. Monte Carlo neutronics simulations were performed to evaluate LLFP transmutation and to compare the results with a reference boiling water reactor (BWR). The results indicate that transmutation of all six LLFPs is neutronics-feasible in fusion reactors, with transmutation half-lives significantly shorter than their natural decay half-lives. For elemental targets, transmutation of 135 Cs, 126 Sn, and 93 Zr was found potentially viable, as the net mass transmuted exceeded that achievable in the reference BWR under identical target volume and irradiation time. When isotopically separated targets were considered, transmutation of 126 Sn and 93 Zr appeared potentially viable. A parametric study demonstrated that plasma geometry modifications can enhance local neutron flux, increasing the transmuted 93 Zr mass by approximately 33% and reducing the transmutation half-life from approximately 240 years to 180 years. Repositioning the target and adjusting material layer thickness reduced the transmutation half-life of 93 Zr to 67 years and increased the net mass transmuted by a factor of 50. Furthermore, these results demonstrate that fusion reactors can enable LLFP transmutation beyond the practical limits of thermal fission reactors and highlight the critical role of reactor and blanket design optimization. Engineering and fuel-cycle considerations required for deployment are beyond the scope of this neutronics-focused study.

73 NUCLEAR PHYSICS AND RADIATION PHYSICSโ†—
DOE OSTI2026

A hybrid Monte Carlo-deterministic second moment method with efficient variance reduction

In this work, we present a hybrid method that combines Monte Carlo with deterministic finite element methods to solve a linear Boltzmann transport equation. Our hybrid method runs orders of magnitude faster than Monte Carlo, without sacrificing accuracy, for a proxy problem from radiative transfer that contains both optically-thick and optically-thin material. We believe that this is the first demonstration of a hybrid Second Moment Method in more than one spatial dimension, the first to consider more than one material, and the first to use variance reduction. Our variance reduction approach arises from an asymptotic analysis in which we show that the magnitude of the scattering source grows without bound. We transform the problem to compute the deviation of the radiation intensity from isotropy. The magnitude of the source in the transformed problem is bounded, and the quality of the hybrid method solution is dramatically improved by a substantial reduction in the variance.

73 NUCLEAR PHYSICS AND RADIATION PHYSICSโ†—