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Temperature Dependent Deformation

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Deformation-driven p-wave halos at the drip line: 31Ne.

T Nakamura¹, N Kobayashi¹, Y Kondo¹

¹Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan.

Physical Review Letters

|April 29, 2014

Summary

Researchers studied the halo structure of Neon-31 (31Ne) using 1n-removal reactions. The findings reveal a significant p-wave halo component, suggesting halos are common at the neutron drip line.

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Area of Science:

Nuclear Physics
Atomic Physics
Quantum Mechanics

Background:

Understanding the structure of exotic nuclei near the neutron drip line is crucial for nuclear astrophysics and the Standard Model.
The neutron drip line represents the frontier of nuclear existence, where nuclei are loosely bound and may exhibit novel structures like halos.

Purpose of the Study:

To investigate the halo structure of the exotic isotope Neon-31 (31Ne).
To determine the neutron separation energy and spin-parity of 31Ne.
To explore the prevalence of halo structures at the neutron drip line.

Main Methods:

Utilized 1n-removal reactions on Carbon (C) and Lead (Pb) targets.
Analyzed cross sections from nuclear and Coulomb-dominated reactions.
Performed large-scale shell-model calculations for comparison.

Main Results:

Determined a small neutron separation energy for 31Ne: 0.15(-0.10)(+0.16) MeV.
Assigned a spin-parity of 3/2- to 31Ne.
Identified 31Ne as deformed with a significant p-wave halo component.

Conclusions:

The results confirm 31Ne possesses a halo structure, characterized by a significant p-wave component.
The findings suggest that halo nuclei are likely more common at the neutron drip line than previously thought.
This study contributes to our understanding of nuclear structure at the limits of stability.