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Unveiling the intruder deformed 02(+) state in 34Si
1Horia Hulubei National Institute for Physics and Nuclear Engineering, IFIN-HH, Magurele, Romania.
Physical Review Letters
|September 26, 2012
Summary
Researchers studied the 02(+) state in Silicon-34 (34Si) via beta decay of Aluminum-34 (34Al). They determined its properties, revealing a large deformation and weak mixing with the ground state, consistent with advanced shell model calculations.
Area of Science:
- Nuclear Physics
- Atomic Physics
Background:
- The study of exotic nuclei provides insights into nuclear structure and forces.
- Understanding nuclear deformation is crucial for nuclear models.
Purpose of the Study:
- To populate and characterize the 02(+) state in 34Si.
- To investigate the nuclear deformation and mixing properties of excited states in 34Si.
Main Methods:
- Utilized the GANIL-LISE3 facility for nuclear decay studies.
- Employed simultaneous detection of electron-positron pairs for precise measurements.
- Performed shell model calculations with a new SDPF-U-MIX interaction.
Main Results:
- Successfully populated the 02(+) state in 34Si through the beta decay of a 34Al isomer.
- Determined the excitation energy (2719(3) keV) and half-life (19.4(7) ns) of the 02(+) state.
- Deduced a significant electric monopole strength (ρ(2)(E0)=13.0(0.9)×10(-3)) and a large deformation parameter (β=0.29(4)).
Conclusions:
- The 02(+) state in 34Si exhibits a large deformation and weak mixing with the ground state.
- Results are in good agreement with shell model calculations incorporating np-nh excitations across the N=20 shell gap.
- The findings contribute to a deeper understanding of nuclear structure in neutron-rich isotopes.
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