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Is the nuclear spin-orbit interaction changing with neutron excess?
J P Schiffer1, S J Freeman, J A Caggiano
1Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Physical Review Letters
|June 1, 2004
Summary
Nuclear spin-orbit interaction decreases with neutron excess in tin isotopes. Spectroscopic factors for single-particle orbitals remain constant, supporting this trend and indicating changes in nuclear structure.
Area of Science:
- Nuclear Physics
- Atomic Physics
- Quantum Mechanics
Background:
- The Z=50 closed proton shell and N=82 core are crucial in nuclear structure.
- Single-particle orbitals outside closed shells exhibit unique energy characteristics.
- Neutron excess influences nuclear properties, including spin-orbit interactions.
Purpose of the Study:
- To investigate the energy differences of specific single-particle orbitals in tin isotopes.
- To determine the role of neutron excess in nuclear spin-orbit interactions.
- To confirm the single-particle nature of h(11/2) and g(7/2) orbitals.
Main Methods:
- Measurement of the Sn(alpha,t) reaction for stable even tin isotopes.
- Analysis of spectroscopic factors for h(11/2) and g(7/2) orbitals.
- Comparison of energy trends with theoretical models of nuclear spin-orbit interaction.
Main Results:
- Spectroscopic factors for h(11/2) and g(7/2) orbitals are constant across tin isotopes.
- The energy difference between these orbitals increases with neutron excess.
- Observed energy trends are consistent with a decreasing nuclear spin-orbit interaction.
Conclusions:
- The study confirms the single-particle nature of the investigated orbitals.
- Results indicate a weakening of the nuclear spin-orbit interaction with increasing neutron number.
- A similar trend is observed for neutron single-particle states outside the N=82 core.