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Localizing the Shape Transition in Neutron-Deficient Selenium.

J Henderson¹, C Y Wu¹, J Ash^2,3

¹Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

Physical Review Letters

|September 8, 2018

Summary

This summary is machine-generated.

Neutron-deficient selenium isotopes shift shape from prolate to oblate. This study measured the quadrupole moment of selenium-72, finding the shape transition occurs later, at selenium-70.

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Published on: October 21, 2018

Area of Science:

Nuclear physics
Atomic nuclei structure
Quantum mechanics

Background:

Neutron-deficient selenium isotopes exhibit shape transitions.
Models predict a shift from prolate to oblate deformation near the N=Z line.
The exact transition point and its sensitivity to spin are not well-understood.

Purpose of the Study:

To experimentally determine the shape transition point in neutron-deficient selenium isotopes.
To measure the spectroscopic quadrupole moment of the first-excited state in selenium-72.
To investigate the influence of low spin on nuclear shape evolution.

Main Methods:

Safe Coulomb excitation technique.
Utilized a rare-isotope beam at the National Superconducting Cyclotron Laboratory.
Measured the quadrupole moment of the first-excited 2+ state in selenium-72.

Main Results:

Demonstrated a negative spectroscopic quadrupole moment for the first-excited 2+ state in selenium-72.
Indicated that the shape transition from prolate to oblate deformation does not occur until selenium-70.
Provided the first low-energy Coulomb excitation measurement using a reaccelerated rare-isotope beam.

Conclusions:

The low-spin shape change in neutron-deficient selenium isotopes is delayed until selenium-70.
Experimental data refines theoretical models of nuclear shape evolution.
Highlights the sensitivity of nuclear shape to isotopic composition.