Nuclear Science Seminar Speaker Schedule Sign Up

Current Schedule

Speaker = Dr. Julian Kahlbow of Lawrence Berkeley National Laboratory

Host = Revel, Aldric revel@frib.msu.edu

When = 2025-04-23 Wednesday 15:30

Where = FRIB 1300

Please feel free to sign up below, but note that some slots may need to be re-assigned to accommodate those with a specific need to meet the speaker. If this happens, the Admin or Speaker Host will reach out to you via email.

Title = Magicity vs Superfluidity, and the structure of extremely neutron-rich O & F isotopes

Abstract

The atomic nucleus is an intricate, strongly-interacting quantum many-body system with fascinating structure rooted in Quantum Chromodynamics. The shell model has been a successful cornerstone describing effectively nuclear structure and predicting magic numbers. However, in extremely neutron-rich nuclei, nuclear structure undergoes significant changes with often surprising effects due to neutron excess and weak binding. One particularly interesting region is around the isotope 28O. In this talk, I will discuss nuclear structure studies of neutron-rich Fluorine isotopes using high-resolution invariant-mass spectroscopy at the SAMURAI setup at RIBF/RIKEN (Japan). We measured the isotope 30F for the first time, confirming the breakdown of the neutron magic number N = 20. Based on shell-model calculations this causes a superfluid behavior. This finding leads to new questions about neutron correlations in a low-density environment, similar to conditions in the crust of neutron stars.

Relevant background with commentary from Dr. Kahlbow:

• My seminar will be based on and mainly discuss the following paper: Magicity versus Superfluidity around 28O viewed from the Study of 30F. We measured 30F in invariant-mass spectroscopy and concluded on nuclear structure in this region, providing proof for Island of Inversion behavior, and discuss superfluidity in extremely neutron-rich systems like 28O and 29F.
• Depending on what you prefer as an introduction to the broader topic, the experiment, invariant-mass spectroscopy, and nuclear structure for neutron-rich F and O isotopes in the Island of Inversion, alternatively you might use the following Nature paper. It may be an easier read, and actually uses data from the same experiment that I'll discuss: First observation of 28O
• As a precursor for nuclear structure of neutron-rich F isotopes and Island of Inversion experiments, you could also use Aldric's work on 28F. Again from the same experiment: Extending the Southern Shore of the Island of Inversion to 28F
• And this paper here is more like a summary article that links the F structure to halo systems, and is a very easy read: The 29F nucleus as a lighthouse on the coast of the island of inversion