---
title: "Groundbreaking Achievement in Particle Physics: Positron Trapped for Months"
url: https://newscentral.site/groundbreaking-achievement-in-particle-physics-positron-trapped/
language: en
publisher: "News Central Site"
section: "Science"
published: 2026-10-21T15:00:00.000Z
updated: 2026-10-21T17:26:37.695Z
id: 6f3bdfde-481c-46fd-a5cb-1b97f7a6870d
source: "New Scientist https://www.newscientist.com/article/2594955-a-single-antimatter-particle-was-held-in-a-trap-for-months/?utm_campaign=RSS|NSNS&utm_content=home&utm_medium=RSS&utm_source=NSNS"
attribution: "Link to https://newscentral.site/groundbreaking-achievement-in-particle-physics-positron-trapped/ and name News Central Site when you quote or summarize this story."
---

# Groundbreaking Achievement in Particle Physics: Positron Trapped for Months

Physicists at Northwestern University have successfully trapped a single positron for an extended period of time, allowing them to study its behavior and properties.

Physicists have made a groundbreaking achievement by capturing and containing a single positron for an extended period of time in a laboratory in Illinois.

The positron is the antimatter counterpart of the electron, sharing the same mass but with opposite electric charge. However, due to their rarity and tendency to quickly annihilate when encountering electrons, studying positrons has been extremely challenging.

Researchers at Northwestern University have developed a method to trap a positron for months on end, allowing them to collect valuable data on its behavior and properties. This breakthrough is expected to provide new insights into the standard model of particle physics.

The team obtained the positron from the decay of a radioactive isotope of sodium, which emits these particles as it decays. To control the positrons, they were placed in a special refrigerator to slow them down and reduce their energy levels.

By studying the behavior of this trapped positron, scientists may be able to resolve one of the biggest problems with our current understanding of physical reality.

To confine the positrons, researchers directed them through a tungsten crystal, which slowed them down further.

Although some positrons were annihilated as they passed through the crystal, others emerged unscathed and continued on their journey.

The positrons were then guided into an empty refrigerated chamber where electronic components generated electromagnetic fields that acted as invisible walls to trap a single incoming positron.

By confining the positron in this way, the researchers were able to keep it trapped for months, a feat previously thought impossible due to its elusive nature.

A crucial aspect of maintaining the trap was keeping the chamber at a precise temperature, just tenths of a degree above absolute zero.

The team led by Gabrielse is now focused on measuring a crucial property of the positron - its magnetic moment. This value quantifies how the particle responds to magnetic fields and could provide valuable insights into the fundamental differences between matter and antimatter.

Comparing the magnetic moments of electrons and positrons would allow researchers to probe the properties of these antiparticles with unprecedented precision. As it stands, the standard model predicts that matter and antimatter should have identical magnetic moments, but this theory has a notable shortcoming - it fails to explain why our universe is predominantly made up of matter.

The standard model's shortcomings are evident in its inability to account for the creation of equal amounts of matter and antimatter at the beginning of the universe. If the theory were correct, one would expect that all matter should have been annihilated by now, leaving behind nothing but energy. However, our existence suggests that something is amiss.

The team hopes that a difference in magnetic moments between electrons and positrons could be a key to unlocking the mystery of why we have a universe at all. If successful, their research aims to provide valuable data within the next year, potentially shedding light on an unknown mechanism that resulted in our matter-filled universe.

---
Source: [New Scientist](https://www.newscientist.com/article/2594955-a-single-antimatter-particle-was-held-in-a-trap-for-months/?utm_campaign=RSS|NSNS&utm_content=home&utm_medium=RSS&utm_source=NSNS)  
Published by News Central Site: https://newscentral.site/groundbreaking-achievement-in-particle-physics-positron-trapped/