Decay scheme of 67Ga

Area of Science:

• Nuclear Physics
• Radiochemistry
• Atomic and Molecular Physics

Background:

• Gallium-67 (67Ga) decay data evaluations show uncertainty regarding a direct electron-capture (EC) branch to the ground state of Zinc-67 (67Zn).
• Accurate decay schemes are crucial for applications in nuclear medicine and physics.

Purpose of the Study:

• To resolve the uncertainty surrounding the existence and magnitude of the direct EC branch from 67Ga to the 67Zn ground state.
• To propose consistent decay parameter values for 67Ga.

Main Methods:

• Review of existing 67Ga decay data from various evaluations.
• Analysis of conversion electron intensities from the 93 keV transition using coincidence counting techniques.
• Application of stringent decay scheme restrictions based on experimental measurements.

Main Results:

• Measurements of conversion electron intensity strongly suggest a non-zero ground-state branch.
• Proposed decay parameter values are consistent with available experimental data.
• An electron-capture branching ratio to the 67Zn ground state of (4.01 ± 0.27)% is indicated.

Conclusions:

• The existence of a direct electron-capture branch from 67Ga to the 67Zn ground state is confirmed.
• The proposed branching ratio provides a more accurate understanding of 67Ga decay.
• This finding refines nuclear decay models and has implications for 67Ga applications.