An international research team consisting of the Japan Institute of Physical Chemistry, the Lanzhou Institute of Modern Physics, Chinese Academy of Sciences, and the German Institute for Heavy Ion Nuclear Science has recently used the Heavy Ion Linear Accelerator (RILAC) to shoot calcium at the atomic number 20 (48Ca). The thermonuclear fusion reaction was performed on the helium (248Cm) target of the 96th beam and successfully synthesized the isotopes 292Lv and 293Lv of the atomic number 116. This achievement has taken a step toward exploring the new elements after the atomic number 119. The research results were published in the recently published "Journal of the Japan Physical Society."
The element after the atomic number 104 is called an overweight element and is synthesized by a heavy ion accelerator through a fusion reaction. So far, cold fusion reactions have been used to synthesize super-heavy elements such as No. 108 (Yihei), No. 110 (Yinda), No. 111 (Junlun), No. 112 (Ying Ge), and No. 113 (Taer). To explore the new elements after 119, a joint research team in Russia and the United States is also using thermonuclear fusion reactions for synthetic experiments.
Thermonuclear fusion reactions use a lighter heavy ion (atomic number 10 to 20) to irradiate the lanthanide (atomic number 89 to 103 elements) target to produce nuclear fusion, which is a hot state compound that has higher excitation energy than the cold fusion reaction. Methods for nuclear synthesis of superheavy elements. The number of neutrons released from the composite nucleus is about 3 to 5, although the number of nuclear fission increases, the ultra-heavy nucleus can be synthesized by the cold fusion reaction between the Fengzhongnuclear nucleus.
The team used RILAC to accelerate the calcium beam to 11% of the speed of light, irradiating the target with an average of 5.7 × 10 (12) calcium atoms per second, triggering a fusion reaction, resulting in the successful synthesis of the (epi) isotope 292Lv and Three 293Lv each.
This research is the first step in the study of new elements after the discovery of atomic number 119 using thermal fusion reactions. As the atomic number increases, the formation rate of thermonuclear fusion reactions gradually decreases, and the synthesis of new elements will be more difficult. (Reporter Chen Chao)
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