Evolution of clustering structure through the momentum distributions in Be-108 isotopes
Abstract
We investigate the evolution of clustering structure through the momentum distributions in the Be-108 isotopes. The nucleon dynamics within the intercluster antisymmetrization are discussed via the momentum distribution of a Brink type α -α wave function. For the state with a small α -α distance, we observe a significant depression with a dip structure at zero momentum and an enhanced tail in a relatively higher momentum region. In addition, we find the "cluster structure" in the intrinsic frame of momentum space, which is complementary to its significant α -cluster dissolution in the coordinate space because of the strong antisymmetrization. For the physical Be-108 isotopes, the Tohsaki-Horiuchi-Schuck-Röpke (THSR) wave functions are adopted. The evolution from the dilute clustering state to the compact one is demonstrated by a successive depression at zero momentum of nucleon distribution for the two α clusters within Be-108 isotopes. For the compact 10Be nucleus, the momentum distribution of all nucleons shows significant depression at zero momentum with a dip structure, which is found to be contributed by both the intercluster antisymmetrization and the p -orbit occupation of the valence neutrons. This study proposes a new window for the investigations of the α -clustering effects via the low-momentum components of nuclei, which is expected to be extended to the heavier nuclear clustering states.
- Publication:
-
Physical Review C
- Pub Date:
- June 2020
- DOI:
- 10.1103/PhysRevC.101.064307
- arXiv:
- arXiv:2005.04409
- Bibcode:
- 2020PhRvC.101f4307L
- Keywords:
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- Nuclear Theory
- E-Print:
- 7 pages, 6 figures, under review in PRC