Demon School

By convention, the celebration after winning the home championship will last a long time, but Lu Qiujian disappeared from the celebration team of Bayern Munich after the parade. If the official website just announced the news of re-signing with him, I am afraid that Bayern fans We should worry again!

After a season of attention, Bayern fans have adapted to the frequent disappearance of Lu Qiujian. They all guessed that this new favorite of their own team might go to engage in scientific research activities?

This is also the case. Lu Qiujian re-boarded the flight back to Geneva after a short celebration. Before leaving, Magath and Beckenbauer repeatedly told him to remember to report to Istanbul in a few days. .

"There is good news to tell you!" Just back to Cern's office, Dr. Evans rushed over and said, holding a stack of printing paper in his hand.

"Oh? There is a new discovery?" Lu Qiujian looked at the printing paper in his hand and guessed, "Who has published a new article or where has new evidence been found?"

"Discovery from your home country!" Dr. Evans opened the printing paper booth to his desk. "The staff of the Purple Mountain Observatory of the Chinese Academy of Sciences is cooperating with the advanced thin ionization calorimeter of the Antarctic Long Cycle Balloon Project in the United States. The study found evidence of annihilation of dark matter particles! They intend to publish this result in the latest issue of "Nature"! "

"Look!" Lu Qiujian took the printing paper excitedly and found the article titled "Cosmic Electrons Discovering" Super "in the 3000-8000tev Energy Range" written by this Chinese scientist.

International Physics has a variety of methods for detecting dark matter, such as underground laboratory detection, collider detection, satellite detection, and balloon detection.

The Jinping underground laboratory planned by Hua Guo uses 2400 meters of high-purity rock to isolate most cosmic rays, and then uses a 1 meter thick polyethylene gate to block and attract neutrons. A 20 cm thick lead layer is used It is used to shield the external gamma rays; 20 cm thick boron-containing polyethylene is used to absorb the remaining neutrons; 10 cm thick high-purity oxygen-free copper is used to block the gamma rays in lead materials and other external materials, These shielding devices shield almost all the radiation sources that can be imagined. At the core of the laboratory, a 1 kg high-purity germanium experimental detector that directly detects dark matter is wrapped in low-temperature liquid nitrogen. The collision of dark matter and germanium crystals will generate heat. They use this principle to detect dark matter.

In addition to the Jinping underground laboratory, Huaguo also has a dark matter satellite launch plan. It is said that this satellite trophy is named Wukong. It seems that it is trying to search for dark matter with the fire eyes and gold eyes of the mythical legend. This name is not bad. When you want to launch a satellite to detect dark energy in the future, you can then name it Wuen! Doesn't it mean to understand dark energy? Well, can Jinping Underground Laboratory be named Wuxing Mountain according to this naming method! No matter what kind of dark matter particles you are, you won't be able to get to Wuxing Mountain!

The researchers of the Chinese Academy of Sciences used high-altitude balloon detection. The high-altitude detection balloon used in the advanced thin ionization calorimeter (abbreviated) of the Antarctic Long-Cycle Balloon Project in the United States is as large as a football field. The two-ton detector can be lifted. At the same time, due to the unique "whirlwind" in the Antarctic area, the balloon will not be blown far when it reaches 40 kilometers from the ground, and it can be recycled and reused on-site, so it has become a high altitude. An important selection area for balloon detection.

The original main scientific goal was to observe high-energy cosmic rays, and electrons and gamma rays were not included. In 1998, researchers from Huaguo contacted them and proposed equipment to observe high-energy electrons and gamma rays. After many communications, the suggestions of the Chinese researchers were accepted.

Hey, this is the tragedy of your own unconditional! He's going to Antarctica. I have to wait in line for the test time in cern, think about the upcoming work, and then the days of high-energy physicists in China will be much more comfortable than they are now; in the final analysis, it is still a matter of money. The country has money. To build some large-scale basic technology facilities, you can only go to other parts of the world without money! Recently, Huaguo also has plans to build its own high-altitude balloon detector. Maybe the next discovery will be born in Huaguo's own equipment.

The Purple Astronomical Observatory Space Astronomy Laboratory has been working at the international frontier, and has its own method for the exploration of dark matter. After reaching a cooperation agreement, their detectors are shipped to cern for testing. The test results indicate that their detection methods are indeed feasible.

This is why Dr. Evans will get the article in advance. He had dealt with the Purple Mountain Space Astronomy Laboratory long before; after the test, they used three observations, and improved the observer during the observation process. The energy resolution was increased by 2 times, and the background was reduced by 5 Times.

These three observations were successful twice. Once failed because of balloons! In these two successful observations, they collected a large amount of effective data. Through the analysis of these data ~ www.wuxiaspot.com ~ they found that the electron energy spectrum is in the energy range of 3000-8000tev, which has a strong comparison with the theoretical results. "Super", the analysis shows that this "super" may be the product of the annihilation of dark matter particles, and the observation results are in good agreement with the kaluza-particle model (particle mass 6200tev) predicted by the dark matter theory.

"Professor Lars-Bergstrom, a dark matter expert at Stockholm University in Sweden, has also read this article. He believes that the observation data is very consistent with the data collected by the European Pamela Dark Matter Detector! The sum of the positron flow rate, on the other hand, measured the rise of the higher energy range and saw the flow rate drop, so from the measurement results, the current detection results are more like the annihilation of dark matter particles. "Dr. Evans said with excitement , "This is the first evidence that humans have discovered the annihilation of dark matter particles, which greatly promotes the study of dark matter!"

"This is both good news and bad news for me!" Lu Qiujian responded with a smile after reading the article. "The good news is that there is one more piece of evidence for the existence of dark matter! The bad news is the dark matter particles discovered this time. The existing energy range is too high, which is completely beyond the design interval! It seems that there is no direct promotion for my test plan! "

The energy level of is only 14tev, the cut off rice country is only 40tev, and the upcoming China project is only 50-70tev. It is completely impossible to achieve the energy level in this observation data; so how do you use this news? (To be continued.)

Ps: This discovery was actually made in 2008.