The climate of the United Kingdom is temperate and oceanic, with no severe cold in winter and no scorching heat in summer, but there is slightly more rain throughout the year.

No wonder the gentlemen in suits and top hats walking the streets either hold a sdick or an umbrella in their hands.

This is not the same as the subtropical monsoon climate of the sea, and it is a very novel life experience for the old lady of the Chen family who has just come to Europe.

There is no annoying rainy season, no more annoying typhoons, and the temperature in summer is hot, but there is no heat like the sea of Tatsumi.

- Not to mention that the food in the UK is not so good, but in terms of temperature and humidity in the summer, it is a little more suitable than before.

However, this is for the Chen family, who have always lived at the eastern tip of the Eurasian continent, and for the British people who have lived on the island for generations, including Chen Muwu, who has become accustomed to living here, the British summer is still very hot.

In Cambridgeshire, the soothing sections of the River Cam and under the willow trees on the banks are crowded with locals and school-students who come to swim and escape the heat.

The willow tree knew it, and it also chirped non-stop.

Chen Muwu, the acting director of the Cavendish Laboratory, "hid in a small building and became a unity, managing his winter, summer, spring and autumn".

He also deliberately closed the heavy curtains of his laboratory, leaving only a lamp in front of the camera that captured the pictures of the cloud chamber, quietly waiting for the neutrons to come.

The cloud chamber, which was improved by Black a few years ago, can take many pictures per minute.

At that time, Blackett had a contradiction between taking too many photos and not seeing photos quickly, so he came to Chen Muwu for help with a bunch of photos of the cloud room.

And that time, Chen Muwu did not fail in his mission, and successfully found the traces of artificial nuclear transmutation recorded for the first time from one of those many photos.

Now that Chen Muwu is taking photos, the more he will enjoy the pain of looking at the photos.

Because no matter how many photos were taken, this time there was no Blackett who helped to see the photos, and there was no Kapitsa, and he had to do all the work by himself.

Therefore, Chen Muwu felt that he should take a few fewer photos at first, so as not to sigh when he faced a few stacks of photographic negatives piled high.

Hopefully, he will be able to get into the mood and no longer need to fine-tune the experimental device, including the acceleration voltage, and directly find the photo of the proton he wants.

Because the light in the laboratory was very dim, Chen Muwu did not go to any darkroom, but directly separated an area inside, so that the photos of the cloud room could be taken and washed at any time.

After the first batch of photographic negatives were washed out, Chen Muwu couldn't wait to quickly look for and examine them one by one.

The good news is that in the first batch of photos, there is already a downward spiral trajectory.

According to the direction of the magnetic field, the particle belt corresponding to this trajectory should be positively charged.

However, where there is good news, there is often bad news.

Bad news, or for Chen Muwu, it doesn't seem to be bad news.

All in all, there is not only one trajectory of spiral shrinkage, and they all shrink in exactly the same direction.

In other words, he found two different positively charged particles in one of his own cloud chamber photonegatives.

Judging by the thickness of the trajectory, one has a large mass and the other has a small mass.

There is no need to look closely, let alone hold a ruler and pen and paper to measure and calculate the charge-to-mass ratio of these two positively charged particles.

Director Chen was only slightly puzzled for a second or two, and he figured out what these two things were.

The one with the most mass is, of course, the proton he is looking for, that is, the thing that the neutron bombards the paraffin block, and bombards it.

As long as there is this proton, it can be shown that Chen Muwu has successfully bombarded the neutron from the boron crystal with the accelerated alpha particles.

That is, he has successfully accomplished his set goal and mastered the means to be able to "accidentally" bombard neutrons in the future.

And the one with the small mass, is-

Positron.

Boron has two isotopes that are stable in nature, boron-10 and boron-11, with the former being 20% abundant and the latter 80%.

Bombarding both isotopes with alpha particles produces neutrons, but the other products in this nuclear reaction are somewhat different.

After being bombarded with alpha particles and boron-10, a neutron is produced, followed by a nitrogen-13.

Nitrogen-13 is an unstable isotope of nitrogen with a half-life of less than ten minutes, and then undergoes a positive beta decay, releasing a positron that becomes stable carbon-13.

This is where the positron comes from.

The neutron is a proton shot out of paraffin wax and contains an energy of 5.7 megaelectron volts.

In the positive beta decay, nitrogen-13 releases positrons with an energy of 1.2 trillion electron volts.

Although it seems that the positron and the proton are several times different in energy, the rest mass of the two of them is also quite different.

If we substitute Einstein's relativistic mass-energy equation, in fact, the speed between the two is basically not that different, and when compared with the speed of light, it is basically the difference of a few decimal places.

Even if the positron decayed by nitrogen-13 may have to pass through or bypass the paraffin block blocking it before it can enter the cloud chamber and be recorded by the camera, the probability will be much lower than that of protons.

But who made Chen Muwu the chosen one, in this experiment, not only shot neutrons from boron-10, "punched" positrons, but also made two newly generated new particles happen to directly or indirectly enter the cloud chamber and be recorded on photographic negatives.

In that original space-time, the positron was first observed at the California Institute of Technology by Zhao Zhongyao, a Chinese physicist who studied with Nobel laureate Milligan.

However, he did not pay attention to and carefully analyze the results at that time, so he missed the discovery of the positron.

However, Zhao's work was not without contribution, and he inspired his younger brother Anderson, who was doing experiments in the same laboratory as him, and allowed Anderson to find the shadow of the positron for the first time two years later, in 1932 – the same year Chadwick discovered the neutron – from the trail left by cosmic rays in the cloud chamber.

Unlike Chen Muwu this time, Anderson found the positron directly from the cosmic rays, and he will also find the μ in the cosmic rays in the future.

Chen Muwu was completely unexpected, bombarding boron-10 with alpha particles to obtain neutrons, and also obtained nitrogen-13, which can produce positive beta decay.

Nuclear physics, which can be said to have been founded in 1911, after the gold leaf experiment, Rutherford proposed the atomic nucleus model, which proposed the existence of atomic nuclei.

Later, he also used alpha particles to bombard nitrogen nuclei and discovered one of the materials that make up the nucleus, protons.

But the turning point in nuclear physics occurred indisputably in 1932.

This was the year in which the first isotope of hydrogen, deuterium, was found, another substance in the nucleus of an atom, and a strangely anomalous positively charged electron was found.

However, in the current time and space, deuterium had already been discovered by Chen Muwu two years ago in the David-Faraday laboratory under the old Prague under low temperature conditions.

Two years later, he found the neutron and the positron at the same time.

Originally, the three important discoveries of nuclear physics in 1932 are now all owned by Chen Muwu himself.

Deuterium was discovered after Chen Muwu won the Nobel Prize in Physics, so it doesn't matter if Sweden doesn't award him the Nobel Prize in Chemistry again, I don't know if he will make up for it in the future.

But the two discoveries of neutrons and positrons, each of which are at the level of a physics prize.

The 1935 Prize in Physics was given to neutrons, and the following year, in 1936, it was positrons.

However, these two discoveries in nuclear physics have led to more than just two physics awards.

In the second half of 1932, the positron was discovered, verifying the existence of the positron predicted by Dirac's own equation, and the 1933 Nobel Prize jury awarded the Nobel Prizes in 1932 and 1933 to Heisenberg, Schrödinger and Dirac respectively.

That's four Nobel Prizes, five golden medals!

Chen Muwu felt that when he "discovered" neutrons and positrons in the future, the Royal Swedish Academy of Sciences, even if he was reluctant, would definitely have to consider awarding Chen Muwu his second Nobel Prize medal.

But it is very likely that the three feats of "neutron discovery", "positron discovery" and "proposing quantum mechanical equations and predicting the existence of positrons" will be pinched together, and he will only be awarded a medal once, just like Chen Muwu did when he won the Nobel Prize for the first time.

In the original time and space, the physics prize was won in 1931 and 1934 because of the lack of valuable physics discoveries, and now he has gathered these discoveries that could be awarded several times in the future.

How the Nobel Prize in Physics should be awarded in the future, and to whom, now seems to be completely confused.

Alas, whatever, let's talk about it later!

However, speaking of the three young theoretical physicists, who won the award because of the discovery of the positron predicted by Dirac, Chen Muwu remembered that he had predicted the existence of positron under Bohr in Copenhagen.

Chen Muwu was not only ridiculed by Pauli, but also made a bet with this defeated general, saying that as long as the existence of positrons was discovered in the future, Pauli would pay Chen Muwu ten British Sovereign gold coins equivalent to ten pounds.

This money was not a lot of money for Pauli, who was still a student studying with Bohr in Copenhagen at the time.

For Pauli, who is now a professor of physics at the University of Berlin, this is even more insignificant.

It is worthless in Pauli's eyes, and it is even less valuable on Chen Muwu's side.

However, Chen Muwu didn't expect to make a fortune through this gambling contract, he just wanted Pauli to bow his head and admit that he was wrong.

Now that he had thought of this, when he published a paper on the discovery of neutrons and positrons, Chen Muwu must write a letter to Pauli and send it to Berlin, Germany, together with the physics journal where the paper is located.

At that time, the witnesses of the gambling contract were Bohr, Heisenberg and Oppenheimer.

Whether Bohr was biased towards himself as a rising star or one of his smartest students, Pauli, Chen Muwu couldn't say,

But Heisenberg and Oppenheimer are now on their side.

Thinking of the gambling contract and Pauli's Jewish identity, Chen Muwu suddenly smiled, he felt like the Antonio who finally won in "The Merchant of Venice", and Pauli was the villain Charlotte.

Pauli was, of course, a great physicist, but not very good in character.

The more you lower your stature for this kind of person, the more he will gain an inch.

Only by convincing him thoroughly can I make it work for me.

In the near future, the mustaches of a force that had already entered the political arena in Germany would hold their third party congress in Nuremberg.

Then their power would expand rapidly, until they would eventually dominate the whole of Germany.

At that time, instead of letting Pauli run to America in a preconceived sense, it would be better to fool Pauli to Sweden like everyone else.

Chen Muwu was as fast as ever in the experiment, from building the experimental device with equipment to finally taking photos with protons and positrons, it only took a few days.

Now that you've found the results you want, there's no point in continuing the experiment.

Carefully putting away the photographs, Chen Muwu disassembled his devices one by one and put them back in the warehouse of the Cavendish laboratory.

He plans to stay in Cambridge for a while longer, and by the way, write some sci-fi outlines about aliens for Eve.

When Chadwick returned early, he would go to his home in London.

On August 10, 1927, U.S. President Coolidge traveled to Mount Rushmore near Keystone, South Dakota, and delivered a speech from a makeshift podium, praising the contributions of Washington, Jefferson, Lincoln, and Theodore Roosevelt at different times in the United States, and announcing the federal government's support for the statues of four U.S. presidents carved on Mount Rushmore on Mount Rushmore.

At the end of the speech, Coolidge handed the sculptor Gezen Bogram a set of drill bits, who climbed to the top of the hill and drilled the first hole above Washington's head.

On the same day, the French Chamber of Deputies voted to repeal a previous law.

This law used to stipulate that if a French woman married a foreigner, she would automatically be deprived of French citizenship.

This law prevented French women from marrying Chinese laborers in France after the First World War, but many preferred to renounce French citizenship in favor of marrying Chinese laborers.

This law was repealed, and it was still inadvertently beneficial to Chen Muwu, so that after next year's wedding, Eve would not change her nationality to Poland, or simply take Nansen's passport.

Also on this day, Chen Muwu received a letter from China.

The letter was postmarked with the name of an institution, the National Government Graduate School.

(End of chapter)