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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

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Mirror energy differences at large isospin studied through direct two-nucleon knockout.

P J Davies¹, M A Bentley, T W Henry

¹Department of Physics, University of York, Heslington, York, United Kingdom. paul.davies@york.ac.uk

Physical Review Letters

|September 3, 2013

Summary

This study presents the first spectroscopy of excited states in Nickel-52 and Cobalt-51 nuclei. Findings reveal that both electromagnetic and unknown isospin nonconserving interactions are necessary to explain observed energy differences.

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Area of Science:

Nuclear Physics
Spectroscopy
Nuclear Structure

Background:

Investigating excited states in nuclei provides insights into nuclear structure and forces.
Isobaric analogue states offer a unique probe for studying isospin symmetry and its breaking.
Nickel and Cobalt isotopes are crucial for understanding nuclear shell evolution.

Purpose of the Study:

To perform the first spectroscopy of excited states in Nickel-52 and Cobalt-51.
To interpret mirror energy differences in terms of isospin nonconserving effects.
To compare experimental data with large-scale shell-model calculations.

Main Methods:

Utilizing a highly selective two-neutron knockout reaction for nuclear excitation.
Performing precise spectroscopic measurements of excited states.
Employing large-scale shell-model calculations for theoretical comparison.

Main Results:

Successfully obtained the first spectroscopy of excited states in 52Ni and 51Co.
Observed mirror energy differences between isobaric analogue states.
Experimental data necessitates the inclusion of both electromagnetic and additional isospin nonconserving interactions for J=2 couplings.

Conclusions:

The study provides compelling evidence for the necessity of both electromagnetic and an unknown isospin nonconserving interaction.
These interactions are crucial for accurately describing the observed nuclear properties.
Further investigation is needed to identify the origin of the additional isospin nonconserving interaction.