Probing the Single-Particle Character of Rotational States in ^{19}F Using a Short-Lived Isomeric Beam.

Area of Science:

• Nuclear Physics
• Atomic Structure
• Quantum Mechanics

Background:

• Understanding the structure of atomic nuclei is crucial in nuclear physics.
• Investigating the properties of excited nuclear states provides insights into nuclear forces and models.
• Rotational bands in nuclei offer a window into collective behavior and single-particle excitations.

Purpose of the Study:

• To investigate the ground-state rotational band of Fluorine-19 (19F).
• To study the single-particle nature of the 13/2+ band-terminating state in 19F.
• To validate nuclear structure models through experimental data.

Main Methods:

• Utilized a beam containing both the isomeric (162 ns) and ground (109.77 min) states of Fluorine-18 (18F) in inverse kinematics.
• Performed a neutron transfer reaction (deuteron, proton) or (d,p) to probe 19F states.
• Analyzed spectroscopic strengths to determine the nature of nuclear states.

Main Results:

• Experimental spectroscopic strengths confirmed the single-particle character of the 13/2+ band-terminating state in 19F.
• The study successfully probed members of the ground-state rotational band in 19F.
• The results align well with shell-model calculations.

Conclusions:

• The findings reinforce the concept of single-particle-collective duality in nuclear structure descriptions.
• The study validates the predictive power of shell-model calculations within the sd shell.
• This research contributes to a deeper understanding of nuclear behavior and theoretical models.