Triple $$\alpha $$ α Resonances and Possible Link to the Efimov Trimers
| Autor: | Aldo Bonasera, M. Lattuada, S. Tudisco, G. Giuliani, C. Spitaleri, Matko Milin, A. Tumino, R. G. Pizzone |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Nuclear reaction 010308 nuclear & particles physics Nuclear structure 01 natural sciences Atomic and Molecular Physics and Optics Coincidence Formalism (philosophy of mathematics) Quantum mechanics 0103 physical sciences Bound state Nuclear structure nuclear reactions 010306 general physics Beam energy nuclear reactions Excitation |
| Zdroj: | Few-Body Systems. 59 |
| ISSN: | 1432-5411 0177-7963 |
| DOI: | 10.1007/s00601-018-1374-y |
| Popis: | The basic condition for Efimov states is the existence of resonant two-body forces. A system of three particles with resonant two-body interactions may form bound states, the so called Efimov trimers, even when any two of the particles are unable to bind. Inspired by this idea we have analysed a set of data from the $$^6\hbox {Li}+^6\hbox {Li}\rightarrow 3 \alpha $$ reaction measured in a kinematically complete experiment at 3.1 MeV of beam energy, corresponding to 29.6 MeV of excitation energy in $$^{12}\hbox {C}$$ , with the characteristic that the 3 $$\alpha $$ channel is fed by three $$^8\hbox {Be}$$ states in the same event. A strong enhancement in the $$\alpha $$ – $$\alpha $$ coincidence yield is experienced for these events. Evidence of three $$^8\hbox {Be}$$ levels within the same 3 $$\alpha $$ event suggests that one particle is exchanged between the other two. According to quantum mechanics, this is a condition for Efimov states to occur and for which no observation exists yet in nuclei. The hyperspherical formalism for the low-energy three-body problem has been applied to point out the 3 $$\alpha $$ particle correlation. |
| Databáze: | OpenAIRE |
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