Discovering a new aluminum isotope: aluminum -20

Nucleus-20 unknown aluminum was noted for the first time by discovering its decomposition while flying.

Three aluminum -20 proton. Credit image: Xiaodong Xu.

Currently, more than 3,300 nucleids are known, but less than 300 stable and are found naturally. The rest is an unstable nucleus that is subject to radioactive decomposition.

Common dissolution modes, such as decomposition α, β- decomposition, β+, electron capture, radiation, and fission, were discovered by the mid-twentieth century.

Over the past few decades, due to the tremendous development in the experimental facilities of nuclear physics and detection techniques, scientists have discovered many strange decay situations in studying cores away from stability, especially in cores that suffer from neutron deficiency.

In the seventies of the last century, scientists discovered mono -proton radioactivity, where the nuclei is decomposed by the emission of the proton.

In the twenty -first century, a bilateral proton radioactivity was found in the deterioration of some of the very neutron deficiency.

In recent years, it has been observed until rare phenomena of dissolution such as the three, fourth and fifth emissions.

“Aluminum -20 is the lighter of aluminum that has been discovered so far,” said Dr. Xiaong Show, a physicist at the modern institute at the Chinese Academy of Science.

“It is located outside the PROTON line, and it has seven neutrons less than a stable aluminum counterpart.”

Using the decomposition technology on the plane in the GSI Helmholtz Flap for Heavy Eun Research, physicists measured the angular correlation of aluminum decay products.

Through the detailed analysis of the corner relationships, they found that the state of aluminum -20 Earth for the first time through one proton emission to the medium Earth state of magnesium 19, followed by the subsequent decay of the Magnesium -19 condition through simultaneous proton.

Aluminum -20 is the first three -proton emitter that was observed where the nucleus nucleus, which is a proton, is a radioactive nucleus of proton.

The researchers also found that the ingredient energy in the state of aluminum -20 is much smaller than the auxiliary predictions of ISOSPIN, indicating the occurrence of a potential ISOSPIN consistency in aluminum -20 and its NEON -20 mirror partner.

This conclusion is supported by modern theoretical calculations that expect the rotation roll in the case of aluminum -20 from the rotation in the NEON -20 Earth.

“This study provides our understanding of proton emissions phenomena, and provides an insight into the structure and decomposition of cores outside the proton punctuation,” said Dr. Show.

team paper It was published this month in the magazine Physical review messages.

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X.-d. what And others. 2025. Eispin is the most detected in a three -proton emitted decomposition. physics. The priest I wish 135, 022502; Doi: 10.1103/hkmy-yfdk

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