Atomic nucleus excited with laser: A breakthrough after decades (tuwien.at)

Article summary

Researchers have successfully excited the atomic nucleus of thorium using a laser, a breakthrough that could combine classical quantum physics and nuclear physics. This achievement is significant because it allows for the study of nuclear transitions with low energy, which is a rare phenomenon. The experiment used UV-C light at around 140nm to cause the transition, and the energy had to be precisely controlled to achieve the desired result. This discovery could lead to a better understanding of nuclear physics and its relationship to quantum mechanics.

Main themes

• Quantum Physics
• Nuclear Physics
• Laser Technology
• Atomic Nucleus
• Energy Transitions
• Thorium Research

What commenters say

• The term 'classical' in the context of quantum physics refers to non-relativistic quantum mechanics, as opposed to relativistic quantum mechanics which combines quantum mechanics and special relativity.
• The energy of the nuclear transition in thorium is unusually low, and it is not yet fully understood why this is the case, with some attributing it to coincidence and others suggesting it may be related to the properties of the nucleus.
• The experiment's use of UV-C light to excite the atomic nucleus is significant because it allows for the study of nuclear transitions with low energy, which is a rare phenomenon, and some argue that this could lead to a better understanding of nuclear physics and its relationship to quantum mechanics.
• The discovery of the thorium nuclear transition has been confirmed by multiple research groups, which is important for verifying the results and ruling out potential sources of error, such as impurities in the crystals used in the experiment.
• Some commentators argue that the distinction between gamma rays, X-rays, and ultraviolet light is not always clear-cut, and that the thorium nucleus's emission of low-energy gamma rays blurs the line between these categories.
• The long half-life of nuclear transitions, such as the one observed in thorium, is due to the high Q-factor of these transitions, which is reflected in the sharp peak of the energy spectrum and allows for precise measurements.
• The use of relativistic quantum mechanics, which combines quantum mechanics and special relativity, is necessary to fully understand the behavior of particles at high energies, and some argue that this is essential for making progress in nuclear physics.
• The replication of the thorium nuclear transition experiment by multiple research groups is an example of the scientific method in action, where results are verified and validated through independent experimentation and peer review.