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Halo structure of (14)Be.
M Labiche1, N A Orr, F M Marqués
1Laboratoire de Physique Corpusculaire, ISMRA et Université de Caen, France.
Physical Review Letters
|February 15, 2001
Summary
The study investigated the two-neutron halo nucleus Beryllium-14 using kinematically complete measurements. Findings suggest a significant 2s(1/2) admixture in its wave function, indicating exotic nuclear structure.
Area of Science:
- Nuclear Physics
- Exotic Nuclei Research
- Quantum Chromodynamics
Background:
- The two-neutron halo nucleus Beryllium-14 (14Be) presents a unique system for studying nuclear structure.
- Understanding the wave function of halo nuclei is crucial for nuclear astrophysics and fundamental physics.
Purpose of the Study:
- To investigate the structure of the two-neutron halo nucleus 14Be.
- To determine the contributions of electromagnetic dissociation (EMD) and probe the wave function's composition.
Main Methods:
- Kinematically complete measurement of 14Be dissociation fragments (12Be and neutrons) at 35 MeV/nucleon.
- Measurement of two-neutron removal cross sections, neutron angular distributions, and invariant mass spectra.
- Analysis of electromagnetic dissociation (EMD) contributions and comparison with three-body model calculations.
Main Results:
- Two-neutron removal cross sections and angular distributions were measured.
- Invariant mass spectra revealed enhanced strength near the threshold for electromagnetic dissociation.
- Comparison with three-body models suggests a large nu(2s(1/2))(2) admixture in the 14Be halo wave function.
Conclusions:
- The results support a significant 2s(1/2) component in the 14Be halo wave function.
- The observed EMD spectrum is consistent with a nonresonant soft-dipole excitation mechanism.