A research group led by Tohoku University, the High Energy Accelerator Research Organization (KEK), and the Japan Atomic Energy Agency (JAEA) has discovered that the basic property of symmetry, which adds special particles to the nucleus, is greatly disrupted.There is a possibility that the nature of the "nuclear force" that connects the protons and neutrons that make up the atomic nucleus can be elucidated.

 Atomic nuclei are made up of protons and neutrons that stick together with a very strong attractive force called nuclear force.This force is still a mystery, so it is not completely understood why protons and neutrons gather to form an atomic nucleus.There is a particle called a lambda particle as a clue to solve this mystery.I discovered that when I put lambda particles in the nucleus, a phenomenon that has never been confirmed before occurs.

 The properties of an atomic nucleus, such as its mass and internal structure, are determined by the number of protons and neutrons contained in it.It is known that nuclei in which the number of positively charged protons and the number of uncharged neutrons are exchanged have a property called "charge symmetry" in which non-charged properties are very similar.This is because the nuclear forces acting on protons and neutrons are the same, so the total amount of acting force does not change even if the numbers of each are exchanged.This was thought to be the same in the presence of lambda particles.However, when the lambda particle exists inside the nucleus, it was discovered that the mass of the one in which the numbers of protons and neutrons are exchanged is different.I don't know the reason yet, but it is expected to be the key to unraveling the whole picture of nuclear force.

 We learn in junior high school that atomic nuclei are made up of protons and neutrons, but it may be surprising that there are still things we do not know.If this mystery can be solved, it may be possible to answer the question of why atomic nuclei exist in this universe.

Tohoku University

Create excellent research results that will be the source of innovation, and develop talented human resources who will lead the next generation

Tohoku University has a rich culture and humanity based on the tradition of "research first principle" since its opening, the idea of ​​"opening the door" and the spirit of "respect for practical science", and is a phenomenon of human beings, society and nature. In response to this, human resources with the ability to carry out intellectual exploration with a "scientific mind", demonstrating their expertise in various fields from an international perspective and leading […]

University Journal Online Editorial Department

This is the online editorial department of the university journal.
Articles are written by editorial staff who have a high level of knowledge and interest in universities and education.
For inquiries and opinions regarding the content of articles, etc. hereThank you.