Decay properties of 2.05-h ₉₅²⁴⁵Am

Area of Science:

• Nuclear Physics
• Radiochemistry
• Radioactive Decay Studies

Background:

• The beta-minus (β-) decay of Americium-245 (Am-245) is a key process in understanding nuclear structure.
• Previous studies on the Am-245 decay scheme provided foundational data but required further refinement.
• High-purity, mass-separated sources are crucial for accurate radioactive decay measurements.

Purpose of the Study:

• To re-analyze historical gamma-ray spectroscopic data from the beta decay of Am-245.
• To identify previously unobserved weak gamma rays emitted during the decay process.
• To deduce and extend the nuclear decay scheme of Am-245 to Curium-245 (Cm-245).

Main Methods:

• Utilized gamma-ray spectroscopy measurements conducted in the early 1970s.
• Employed a co-axial Germanium-Lithium-drifted (Ge(Li)) detector for high-resolution gamma-ray detection.
• Analyzed data from a chemically and isotopically pure, mass-separated Am-245 source.

Main Results:

• Several previously unidentified weak gamma rays associated with the Cm-245 daughter nucleus were detected.
• The analysis provided new insights into the energy levels and transitions within Cm-245.
• The deduced decay scheme represents an extension and refinement of the existing Am-245 decay model.

Conclusions:

• The re-analysis of historical data significantly enhances the understanding of the Am-245 decay process.
• The identified gamma rays and extended decay scheme contribute valuable information to nuclear structure models.
• This work highlights the enduring value of well-characterized historical spectroscopic data in nuclear physics research.