Magnetic Dipole Transitions Drive Low-Energy Enhancement in 70Zn

The low-energy enhancement observed in the gamma-ray strength function of the atomic nucleus 70Zn is attributed to magnetic dipole transitions occurring between its nuclear states. This finding clarifies a long-standing question regarding the underlying mechanism responsible for this specific nuclear property.

The research, published online on July 15, 2026, in the journal Nature, utilized advanced spectroscopic techniques to analyze the decay patterns and energy levels within 70Zn. By meticulously measuring the emitted gamma rays and their energies, scientists were able to identify the specific types of transitions that contribute to the observed enhancement. The study's findings indicate that these magnetic dipole transitions are the dominant factor, outweighing other potential contributions such as electric quadrupole transitions.

Understanding the gamma-ray strength function is crucial for nuclear physics, as it influences various nuclear processes, including those relevant to nucleosynthesis in stars and the design of nuclear reactors. The specific characteristics of 70Zn's enhancement provide a valuable case study for refining theoretical models of nuclear structure and reactions. The precise nature of these magnetic dipole transitions offers insights into the collective behavior of nucleons within the nucleus at low excitation energies.

This detailed characterization of the low-energy enhancement in 70Zn contributes to a broader understanding of nuclear astrophysics and the fundamental forces governing atomic nuclei. The research team's work provides a concrete example of how specific transition types can significantly impact nuclear properties, offering a benchmark for future investigations into similar phenomena in other isotopes and elements.