It is the second discovery of a new type of hypernucleus for this group, following on their discovery of the "Nagara Event," and here too, it was confirmed that the force acting between the lambda particles is attractive.
Whereas normal nuclei are made of protons and neutrons, which are composed of up- and down-quarks, Lambda particles resemble nucleons consisting of three quarks but have a "strange-quark", i.e., a 3rd quark.
Therefore, researchers at the Hadron Experimental Facility are artificially creating hypernuclei, in which lambda particles similar to the protons and neutrons comprising the atomic nucleus are inserted into atomic nuclei, and research is being conducted to investigate the nuclear forces acting between the lambda particles and protons/neutrons.
In xi experiments, we captured particle tracks on emulsions just as we did for lambda particles, but this time we increased the number of analytic plates for the images substantially and did a very diligent analysis.
Later, we learned that sigma particles, in contrast to lambda particles, repel atomic nuclei, indicating that they're not likely to be present in neutron stars.
At point A, a hypernucleus with two lambda particles added to a helium nucleus (DH.) is created; one lambda particle then decays at point B, and the other at point C.
At point A, xi particles are bound within an atomic nucleus.Then, two atomic nuclei including lambda particles are created and decay at points B and C. 2.
A地点でグザイが束縛され,ラムダを含む原子核が2つでき,それがB点とC点で崩壊している。
Therefore, in the research, Xi-particles containing two strange quarks produced using accelerator beam were injected into a nuclear emulsion, double strangeness nuclei containing two strange quarks (double-Lambda nuclei or Xi nuclei) generated in the nuclear emulsion were searched for to study the nuclear force between Lambda particles, Xi-particle-nucleon that act inside the double strangeness nuclei.
It is the second discovery of a new type of hypernucleus for this group, following on their discovery of the "Nagara Event," and here too, it was confirmed that the force acting between the lambda particles is attractive.
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