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Lifetime Measurements and Triple Coexisting Band Structure in ^{43}S.

T Mijatović¹, N Kobayashi¹, H Iwasaki^1,2

¹National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.

Physical Review Letters

|July 21, 2018

Summary

This summary is machine-generated.

New measurements on the neutron-rich sulfur-43 nucleus reveal three coexisting bands near the ground state. This finding challenges the N=28 shell closure in neutron-rich isotopes.

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Area of Science:

Nuclear Physics
Atomic and Molecular Physics

Background:

Investigating excited states in neutron-rich nuclei provides insights into nuclear structure and shell closures.
The N=28 shell closure is a key feature in nuclear physics, but its stability in exotic nuclei is under scrutiny.

Purpose of the Study:

To perform lifetime measurements of excited states in the neutron-rich nucleus ^{43}S.
To investigate the nuclear structure and the stability of the N=28 shell closure in this exotic isotope.

Main Methods:

Utilized the recoil-distance method with fast rare-isotope beams.
Employed the Gamma-Ray Energy Tracking In-beam Nuclear Array (GRETINA) for precise measurements.
Analyzed γγ coincidences and lifetime data to resolve excited states.

Main Results:

Resolved a doublet of (3/2^{-}) and (5/2^{-}) states at low excitation energies in ^{43}S.
Identified evidence for three coexisting bands near the ground state, including a prolate-deformed ground state band, an isomeric band with 1f_{7/2}^{-1} character, and a newly discovered excited band.
Observed consistency between experimental data and theoretical calculations (π(sd)-ν(pf) shell model and antisymmetrized molecular dynamics).

Conclusions:

The experimental findings support the existence of multiple coexisting configurations in ^{43}S.
The results provide further evidence for the collapse of the N=28 shell closure in neutron-rich nuclei, indicating a significant deviation from the expected nuclear landscape.