Evidence of Partial Seniority Conservation in the πg_{9/2} Shell for the N=50 Isotones

Area of Science:

• Nuclear physics
• Atomic and molecular physics

Background:

• Understanding nuclear structure and transitions is crucial in nuclear physics.
• Seniority quantum number provides insights into nuclear shell structure.

Purpose of the Study:

• To determine reduced transition probabilities for specific transitions in 90Zr, 92Mo, and 94Ru.
• To investigate the conservation of seniority in the N=50 g9/2 orbital.

Main Methods:

• Utilized multinucleon transfer reactions to probe nuclear states.
• Performed large-scale shell-model calculations using realistic interactions.
• Analyzed extensive lifetime information of nuclear transitions.

Main Results:

• Reduced transition probabilities for 4+1→2+1 and 2+1→0+1 transitions in 92Mo and 94Ru were determined.
• Reduced transition probabilities for 4+1→2+1 and 6+1→4+1 transitions in 90Zr were determined.
• Experimental data were interpreted using shell-model calculations in the f5/2, p3/2, p1/2, and g9/2 proton valence space.

Conclusions:

• Seniority is found to be largely conserved in the first πg9/2 orbital for N=50 nuclei.
• The combination of lifetime data and shell-model calculations was essential for understanding seniority conservation.