In particle physics, the weak force is crucial for changing quarks, changing atomic structure, and transmutation of elements. The weak force is the force that causes quarks to transform into different types of quarks or changes the charge of a quark. It is one of the three fundamental forces in the Standard Model of particle physics, i.e. forces that cannot be reduced to smaller forces. In the Standard Model of particle physics, the weak force is carried by subatomic particles called W and Z bosons.

Oak Ridge National Laboratory's Helium-3 Precision Experiment measures the weak force between protons and neutrons by detecting the tiny electrical signals produced when neutrons combine with helium-3 nuclei and then decay. Image credit: Andy Sproles/ORNL, U.S. Department of Energy

Quark transformation and element transformation

The weak force converts protons into neutrons and vice versa by converting quarks into other types of quarks. This is important because this transformation changes atoms from one element to another. A proton contains two up quarks and one down quark. Neutrons contain one up quark and two down quarks. In the nucleus, protons and neutrons are held together by strong forces. In contrast, the weak force neither holds objects together nor pushes them apart. Instead, it changes the "flavor" of a quark, changing it from an up quark to a down quark, or vice versa. By turning quarks into different types of quarks, the weak force turns neutrons into protons and protons into neutrons.

The mechanism of weak interactions and their effects

This change describes a process called "weak interaction." One type of weak interaction is beta decay, which is a type of radioactive decay. One form of beta decay is beta plus decay, which involves the weak force causing a proton to transform into a neutron. This process releases a positron and an electron neutrino. It also reduces an element's atomic number by one, turning it into another element. Therefore, carbon-10 decays into boron-10. Another form of beta decay is beta negative decay, which is the conversion of a neutron into a proton by the weak force. This process produces an electron and an electron utrinino. It also increases the atomic number of an atom by one and likewise transforms it into a different element. For example, carbon-14 becomes nitrogen-14.

Exploring the diversity of weak interactions

In addition to beta decay, scientists have discovered many other types of weak interactions. These weak interactions are either "charged current" interactions or "neutral current" interactions. "Charged-current" interactions change the charge of quarks, while "neutral-current" interactions do not. That's why there are two kinds of bosons: the W boson, which is charged, and the Z boson, which is uncharged.

weak force facts

The weak force is the only fundamental force that violates certain symmetries. You can learn more in this Fermilab video about the weak force:

And learn more about all the forces in this longer Fermilab video:

Read Scientific American's story to learn how scientists understand how strong force is created. At the Department of Energy's Oak Ridge National Laboratory, scientists conduct precise experiments to measure the weak force.

Department of Energy, Office of Science: Contributions to the Standard Model of Particle Physics

The Department of Energy has long supported research into elementary particles and the forces that act on them. Five of the six quarks, one lepton, and all three neutrinos were discovered at what is now the Department of Energy's National Laboratory. Researchers supported by the Department of Energy's Office of Science, often collaborating with scientists around the world, have contributed to Nobel Prize-winning discoveries and refined measurements of the Standard Model.

These efforts continue today. With support from the Department of Energy's Office of Science, scientists conduct experiments to accurately test the Standard Model and further improve measurements of particle properties and their interactions. Theorists work with experimental scientists to develop new ways to explore the Standard Model using particle accelerators and other tools. The research could provide insights into unknown particles and forces related to dark matter, dark energy, and what happened to antimatter after the Big Bang.

Compiled from /ScitechDaily

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