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Categoría: Física Experimental de Alta Energía

CCTVal´s particle physicists publish in the prestigious Science magazine

The Science magazine´s publication called “Momentum sharing in imbalanced fermi systems” has among the main authors the Santa Maria University scientists, William Brooks and Hayk Hakobyan. This work proves that the links formed between nucleons are stronger among proton-neutron pairs than the ones formed between neutron-neutron and proton-proton.

The Science magazine´s publication called “Momentum sharing in imbalanced fermi systems” has among the main authors the Santa Maria University scientists, William Brooks and Hayk Hakobyan. This work proves that the links formed between nucleons are stronger among proton-neutron pairs than the ones formed between neutron-neutron and proton-proton.

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The data collected in Jefferson Lab´s CLAS experiment was used to realize this study that now has William Brooks and Hayk Hakobyan as two of the nine main authors, two professors from the Federico Santa Maria Technical University and researchers from the Scientific and Technological Center of Valparaiso (CCTVal), both experimental particle physicists. This experiment consisted of a system of simultaneous electron bombardment over a target of very light atomic nucleons (for example, deuterium) and very heavy atomic nucleons (lead or iron).

These new results come from experimental data analysis carried out since 2010, and contrary to what was expected, it demonstrates that in heavy nucleons, protons have in average bigger movements (Fermi momentum) than neutrons.

This discovery is important all on its own, but it will also help understand other phenomena, like the interaction between nucleons in ultra-cold gasses, or in the structure of the neutron stars, since the atomic composition that occurs in these systems are similar to the ones of the very heavy nucleons analyzed in this experiment.

The inclusion of this publication in Science magazine, with the tile of “Momentum sharing in imbalanced fermi systems”, shows the importance of the results shed from this scientific study. Science magazine is highly regarded in the field of science given its high impact factor that according to Thompson ISI, it was 31,477 for 2013, distancing itself from the average reached by other renowned scientific magazines ( usually of 4 to 7 points).

On the other hand, the work done by professors Brooks and Hakobyan has resulted in the participation of the High Energy Laboratory from CCTVal, also known as Silab, in a world-class experiment like CLAS. Currently the CLAS detector is under renovation and both researchers together with the engineer, Juan Vega and other members from the Silab Laboratory are working in a new design and construction of a prototype for the experimental target of said detector, which will allow to improve collision measurement with higher energies and new conditions, like the exposure to a high magnetic field, for the prompt refinement of the experiment that shed the data for this important scientific publication in Science magazine.

Escrito por 20 · Nov · 2014

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