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The mass of 22Mg
M Mukherjee1, A Kellerbauer, D Beck
1GSI, Planckstrasse 1, 64291 Darmstadt, Germany.
Physical Review Letters
|November 5, 2004
Summary
Precise mass measurements of 22Mg, 21Na, and 22Na were conducted. These findings aid in testing the conserved-vector-current hypothesis and understanding nova explosions.
Area of Science:
- Nuclear Physics
- Astrophysics
Background:
- Precise mass measurements are crucial for nuclear structure and reactions.
- Superallowed beta decays offer insights into fundamental symmetries.
- Nova explosions involve nuclear reactions that are difficult to model accurately.
Purpose of the Study:
- To perform high-precision mass measurements of 22Mg, 21Na, and 22Na.
- To obtain a comparative half-life (Ft value) for the superallowed beta decay of 22Mg.
- To determine the resonance energy for the 21Na proton capture reaction.
Main Methods:
- Utilized the ISOLTRAP Penning trap mass spectrometer at CERN.
- Achieved relative precision better than 1.5 x 10(-8).
- Measured mass excesses for 22Mg, 21Na, and 22Na.
Main Results:
- Mass excesses determined: D(22Mg)=-399.92(27) keV, D(21Na)=-2184.71(21) keV, D(22Na)=-5181.56(16) keV.
- A comparative half-life for 22Mg beta decay was obtained.
- The resonance energy for 21Na proton capture was independently determined.
Conclusions:
- The results provide a new Ft value for 22Mg, aiding tests of the conserved-vector-current hypothesis.
- Independent determination of the 21Na proton capture resonance energy allows for improved comparisons with nova explosion models.
- High-precision mass spectrometry is vital for advancing nuclear physics and astrophysics research.