What the study found
The study found that the radius of a proton resonance can coincide with the real-energy radius during an early-time plateau. It also found a nonmonotonic dependence of the complex radius on decay energy and a local increase of the charge radius across the threshold, described as a halolike enhancement.
Why the authors say this matters
The authors say nuclear radius is a fundamental structural observable that informs properties of atomic nuclei and nuclear matter. They also note that charge radii of proton-unbound nuclei are of particular interest because they will soon be approached in laser spectroscopy.
What the researchers tested
The researchers used a complex-energy approach and direct time propagation to investigate the radius of a proton resonance. They studied a proton resonance, including its Gamow resonance form, where the size is described as ill defined in the standard stationary quantum-mechanical description.
What worked and what didn't
The analysis identified an early-time plateau during which the Gamow resonance radius matches the real-energy radius accessible experimentally. The study also demonstrated a nonmonotonic dependence of the complex radius on decay energy and a local increase in charge radius across the threshold. The abstract does not describe any approach that failed.
What to keep in mind
The abstract does not provide detailed numerical results, sample systems, or quantitative uncertainty estimates. It also does not describe limitations beyond noting that the resonance size is ill defined in the standard stationary quantum-mechanical description.
Key points
- A proton resonance radius can match the experimentally accessible real-energy radius during an early-time plateau.
- The complex radius changes nonmonotonically with decay energy.
- The charge radius shows a local increase across the threshold, described as a halolike enhancement.
- The authors used a complex-energy approach and direct time propagation.
- The abstract says nuclear radii are fundamental observables for nuclei and nuclear matter.
Disclosure
- Research title:
- Proton resonance radii show an early-time plateau and threshold increase
- Authors:
- Y. R. Lin, S. M. Wang, W. Nazarewicz
- Institutions:
- Facility for Rare Isotope Beams, Fudan University, Fudan University, Michigan State University
- Publication date:
- 2026-03-03
- DOI:
- 10.1103/zz6w-qgrr
- OpenAlex record:
- View
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