Researchers collaborate to better understand the weak nuclear force

يتعاون الباحثون لفهم القوة النووية الضعيفة بشكل أفضل

Radial planar cross-sectional view of BPT showing a typical tertiary event. attributed to him: physical review messages (2022). DOI: 10.1103/ PhysRevLett.128.2202502

The weak nuclear force is not currently fully understood, despite it being one of the four fundamental forces of nature. in a pair of physical review messages In the articles, a multi-institutional team, including theorists and specialists from Louisiana State University, Lawrence Livermore National Laboratory, Argonne National Laboratory and other institutions are working closely together to test physics beyond the “Standard Model” through high-resolution measurements of beta-nuclear decay.

By loading ions of lithium-8, an exotic heavy isotope of lithium with a half-life of less than one second, into an ion trap, the experimental team was able to detect the energy and directions of particles emitted in the beta decay of lithium-8 produced using the ATLAS accelerator at Argonne National Laboratory. Put it in an ion trap. The different underlying mechanisms of the weak nuclear force will give rise to distinct energy and angle distributions, which the team determined with unparalleled precision.

Recent calculations had to be performed using the symmetry-adapted ab initio nonnuclear chance model, which was developed at Louisiana State University, to account for normally negligible effects that are 100 times smaller than the dominant decay contributions. However, since the experiments have achieved remarkable accuracy, it is now required to confront the regular uncertainty of such hard-to-measure corrections.

In their paper, “The effect of agglomeration on 8Li Beta Decay and Recoil Form Factors,” LSU-led collaboration sets unprecedented limitations on recoil corrections in β-decay. 8Li, by identifying a strong relationship between them and 8Ground-case four-way torque in large-scale beginner calculations.

The results are necessary to improve the sensitivity of high-resolution experiments that probe weak interaction theory and test physics outside the Standard Model. Dr. Gregor Sargsyan led theoretical developments when he was holding his Ph.D. A student at LSU, he is currently a postdoctoral researcher at Lawrence Livermore National Laboratory (LLNL).

In “Improving the limit on tensor currents in the weak interaction of 8Li Decay, “Researchers provide the most accurate measurement of tensor currents in a low-energy regime by examining the correlation of β−¯ν between trapped 8Lithium ions with a beta decay urine trap. The results were found to be consistent with the Standard Model’s prediction, ruling out some potential sources of “new” physics and setting a standard for accurate measurements of this kind.

“This has important implications for understanding the physics of the tensor current contribution to the weak interaction,” said LSU assistant professor Alexis Mercenne. “So far, the data has favored only vector and axial vector couplings in the electroweak Lagrangian, but it has been suggested that other non-variable interactions such as tensor, scalar, and quasipulative, can arise in extensions of the Standard Model.”

“These are fantastic results – the level of theoretical accuracy reached in ab initio theory outside of lighter cores is unprecedented, and opens the way for new, high-accuracy predictions in atomic nuclei “Rooted in first principles,” Associate Professor Christina Looney said.

“In addition, no one expected these theoretical developments to reveal a new state in the 8Be nucleus that had not yet been measured. This nucleus is known to be difficult to model due to its cluster structure and group affinities, but becomes feasible for computations in the ab initiation framework of an adaptive non-basic shell model. with symmetry.”

The excitement of modern nuclear physics lies in its interdisciplinary nature and the use of a wide range of techniques and tools. LSU has experimental and theoretical research groups in nuclear physics, with strong links to high energy Physics and Astrophysics/Space Science groups. The main focus of the experimental and theoretical groups is in the field of low-energy nuclear structure and interactions, including the study of far from stable nuclei and applications in astrophysics.

more information:
GH Sargsyan et al, Effect of aggregation on Li8 dissolution and regression factors, physical review messages (2022). DOI: 10.1103/ PhysRevLett.128.2202503

MT Burkey et al., Optimizing the limit on tensor currents in the weak interaction of Li8β Decay, physical review messages (2022). DOI: 10.1103/ PhysRevLett.128.2202502

the quote: Researchers collaborate to better understand the weak nuclear force (2022, November 1) Retrieved on November 2, 2022 from

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