Experimental evidence for cluster structures in light and medium weight nuclei

Journal Article · Sat Nov 05 00:00:00 EST 1960 · Nuclear Phys.

DOI:https://doi.org/10.1016/0029-5582(60)90046-8· OSTI ID:4097136

Sheline, R K; Wildermuth, K

The assumption in accordance with the cluster model is that nuclei may be considered to be composed of clusters (single nucleons, H², He³, H³, He⁴. etc.). Comparison of cluster model predictions and experimental level schemes s 1>s⁶, F¹⁹, Ne²⁰ Ca⁴⁰, and Sc⁴³. It is shown that comparisons between the spectra of certain pairs of nuclei are particularly relevant from the viewpoint of the cluster model. Comparisons of the spectra of the following pairs of nuclei are made: N¹⁵, O¹⁷, F¹⁹ Ne²⁰ K⁴⁰ Ca⁴¹. and Sc⁴³ Ti⁴⁴. In addition, the cluster model predicts levels of parity different from the ground state. The relative position of these nuclei are compared in nuclei in which the smallest cluster is varied from a single nucleon to larger clusters. This model further predicts that immediately after double closed-shell structures, nuclei with H³ or He³ clusters (e.g., F¹⁹ will exhibit a strong decrease in this excitation energy. The negative parity states and first 0⁺ states in alpha -particle nuclei should decrease with increasing atomic number. These predicted systematics agree with the limited experimental data which are available but suggest the need for considerable additional data to further test the predictions. These results indicate substructures which are often more important than shell-model structures.

• Research Organization: Florida State Univ., Tallahassee
• NSA Number: NSA-15-010009
• OSTI ID: 4097136
• Journal Information: Nuclear Phys., Vol. Vol: 21; Other Information: Orig. Receipt Date: 31-DEC-61
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ALPHA PARTICLES
BERYLLIUM 7
BINDING ENERGY
CALCIUM 40
CALCIUM 41
CARBON 12
CLUSTER MODEL
DEUTERONS
ENERGY LEVELS
EXCITATION
FLUORINE 19
GAMMA RADIATION
HELIUM 3
LITHIUM 7
MASS
NEON 20
NITROGEN 16
NUCLEAR MODELS
NUCLEAR STRUCTURE
NUCLEAR THEORY
OXYGEN 16
OXYGEN 17
PARITY
POTASSIUM 40
SCANDIUM 43
SHELL MODELS
SPECTRA
SPIN
TITANIUM 44
TRITONS