.

Another problem of atomic bombs is also an important bottleneck that limits their power. Nuclear charges can achieve an atomic bomb explosion as long as their volume or mass exceeds a certain critical value. However, there is another problem that atomic bombs are triggered here, that is, how to do it: when it does not need to explode, it does not explode; when it needs to explode, it can explode immediately. Otherwise, it will explode in its own position, which is an amazing thing. This control is achieved through the control of critical mass or critical size.

In principle, the simplest atomic bomb adopts the so-called gun-type structure. Two blocks that are smaller than the critical mass are separated by a certain distance and will not cause an explosion. When they are combined together, they are greater than the critical mass and explode immediately. However, if they are slowly combined, the energy generated is enough to blow them away shortly after the chain reaction begins, and the chain reaction stops. The explosion power of the atomic bomb and the utilization rate of nuclear charge will be very small, which is somewhat similar to the situation when the reactor supercritical accident explodes. Therefore, the key issue is to enable them to be combined very quickly.

The approach of China's nuclear industry is to place part of it at one end and the other part in the "cannon barrel". With the help of strong explosives, they are completely combined very quickly, causing a supercritical and producing a high-efficiency explosion. In order to reduce neutron losses, there is a neutron reflective layer outside the nuclear charge; in order to delay the dispersion of the nuclear charge, the atomic bomb has a solid shell.

In 1918, China developed a successful atomic bomb (codenamed "Konggong" structure, with a bomb weighing about 3,100 kilograms, a diameter of about 65 cm, a length of 235,4,000 tons of tier equivalent. In the gun structure, each nuclear charge cannot be too large, and can only be close to the critical mass at most, and must never be equal to or exceed the critical mass. Therefore, when two nuclear charges are closed, the total mass can only be nearly twice as high as the critical mass. This limits the explosion power of the atomic bomb.

In addition, in the gun-type structure, although the two nuclear charges are closed at high speed, the time it has been experienced during the closing process still seems too long. This explosion is caused by the neutrons released by spontaneous fission before the two nuclear charges are fully merged. This "premature ignition" causes an inefficient explosion, which makes the utilization rate of nuclear charges very low. One kilogram of 235 (or 239) 25 kilograms 235 (or 6-8 kilograms 239), two.

It cost tens of billions, and in the end, it only got five 4,000 tons of ground nuclear bombs. This was a bit unacceptable for Zhao Gang. You should know that 10 billion at this time meant 100 tons of gold. When Zhao Gang thought of this, his heart was bleeding. However, since the atomic bomb was built, he had to find a place to throw it down no matter what. Zhao Gang was in a very bad mood at this time. In fact, no matter who it was, as long as he spent so much money to make a big bomb, he probably wouldn't be in a good mood.

As for the goal, Zhao Gang has already decided. Is there any nation that is more suitable for this kind of flame that was originally produced in the sun than the Japanese? Since we talk about our own affairs, it should be natural to bear the anger of the sun god.

In addition, as a country, the Japanese have almost never assumed the responsibility of a country, and went back on their word and fought without declaring the war. All the evil deeds of the countries are undoubtedly reflected in Japan. If such bombing is carried out against other countries, it may cause dissatisfaction, including allies. However, if Japan is bombed, almost no country will object.

Japan is such a poor country. Although its efforts are limited to its own conditions, it has almost no way to become a world power by following normal methods. Therefore, it is very radical in its use of local methods, resulting in almost no allies. More than 20 years ago, Zhao Gang still had fantasies about Japan, hoping that China and Japan would form a strategic alliance, but soon, this idea was destroyed with the end of the Sino-Japanese War.

Of course, it is more important to estimate the deterrence of the atomic bomb. After a comprehensive analysis by the General Staff Headquarters, if the atomic bomb is dropped, a 65% of the Japanese strike may lead to Japan's surrender again. This is nothing to doubt. Just like a bitch, if the first time the legs are spread to someone other than her husband, it will be easier for the second time. The General Staff believes that as long as Japan surrenders, the Chinese Expeditionary Force will reduce the number of two

From this perspective, the development cost of 10 billion is not expensive.

The goal was quickly determined. Japan divided the thirteen states in the United States, all of which were on the west coast of the United States. The main gathering area was in San Francisco. This city that had been slaughtered became the largest gathering place in Japan because of its important geographical location. In order to avoid the Chinese air force, the Japanese almost hollowed out San Francisco and established a new city underground.

Meng Xinghong was appointed as the executive captain of this bombing. Before this, he did not understand the specific meaning of this bombing, but in the introduction of the atomic bomb, Meng Xinghong still felt a hint of chill. The only situation of the atomic bomb is that it will explode at 50,000 tons of tnt explosion equivalent.

Meng Jiehong still felt its weight as to this number. It would be a very large explosion. Two consecutive bombs were bombed on Chicago, and the equivalent of 2,000 large bombers was dispatched, and the equivalent of the bombs dropped was only 5,000 tons. When she thought about such a large amount of money was thrown to the Japanese, Meng Jiehong couldn't stop her mouth and immediately said that Meng Jiehong was willing to participate in the war, but Meng Jiehong was not a reckless guy. After thinking for a while, she asked a question: How should we stay away from the bomb after dropping it?

When bombs were dropped in Europe and America, they were dropped and flew directly forward. But what should we do this time? A nuclear expert thought for a while and replied: "You can't move forward directly, because you were just above it when the bomb exploded, and no one would know where you were." He said, "You should immediately leave the expanding shock wave at a tangent angle."

Meng Jiehong scratched her head and asked a little embarrassedly: "I have learned some trigonometry and some physics, but most of them have been given to the teacher. Can you directly say what the angle of tangent is?"

The expert blushed a little and checked and turned 159 degrees, so that he could get rid of the bomb that had exploded to the maximum extent."

After receiving the definite answer, Meng Xinghong began to practice over and over again until he could complete the movements in 4042 seconds without thinking and dare not neglect. Time passed while waiting, and Meng Xinghong's patience was also rewarded before autumn came.

According to weather forecasts, the 86th is the best day to attack San Francisco. Meng Xinghong and others made all necessary preparations and conducted all inspections. Only in this way can they fly over enemy airspace. In order to prevent leaks, the Hawaii Air Force Base uses a special telex typewriter. A specially trained password transmitter told Beijing with a password: We are ready and ready to set off at any time.

Meng Xinghong was ready to set off at around 4 pm. The emperor's order arrived: "Use them as you wish and let the damn Japanese die." They set the time to throw bombs at the target, that is, 9:15 am. But that was Beijing time, an hour later than Japanese time. Meng Xinghong told the navigator: "You calculate the time and see when you must set out after midnight to reach the target at 9:00 am."

After calculation, Meng Xinghong slid on the runway at about 215 in the morning and took off with her comrades. Meng Xinghong flew to the so-called Piaotiansi, which was a geographical location where we could not make mistakes. Of course, Meng Xinghong's Piaotiansi, was the best in the world - Piaotiansi, with rivers, bridges, and the great temple. There was no mistake.

The aircraft has a bombing sight that is continuous with the autopilot. The bomber enters the position where he wants to throw the weapon and then transmits it to the aircraft. Once a mistake occurs, the door of the bomb bay cannot be opened. Each aircraft is equipped with a manual throwing device. Just under the bomber's seat, you can reach out and pull it. The crew on the aircraft following behind must know when to drop the bomb.

Meng Jinghong was told not to use radio, but Meng Jinghong, who has always been the only one, was not ready to execute honestly. If the radio could not be used, Meng Jinghong was ready to say this: "There is one minute, 30 seconds, 20 seconds, 10, 9, 87, 6, 54 seconds", so that they know when to drop the bomb. They know what the situation is, because they know Meng Jinghong's location.

After completing the aircraft formation, Meng Xinghong started his own broadcast: "Do you know what to do today?" They said: "I know, I'm going to carry out a bombing mission."

"Yes, it's about to carry out a bombing mission. But this bombing is a bit special."
Chapter completed!