The failed Japanese nuclear weapons program and the F-Go operation

During the Second World War, several nations followed the development of nuclear weapons, with the Japanese Empire often overlooked. Despite considerable resources and scientific competence, the Japanese armed forces’ plan to construct a nuclear bomb failed. The reasons for this were diverse and ranged from internal rivalries between the armed forcesup to serious material shortages. A detailed review of these historical events reveals not only the technical challenges, but also the structural problems within the Japanese military.

The Japanese Navy’s parallel research efforts

The failure of the Ni-Go project did not mean the end of Japanese nuclear weapons efforts. The Japanese forces had not concentrated all resources on a single research direction as a precaution. Parallel to other initiatives, Bunsaku Arakatsu and the Shipbuilding Office worked intensively on the development of nuclear weapons. These parallel structures shouldIncrease chances of success and minimize the risk of a complete failure.

The scientific authority of Professor Arakatsu

Bunsaku Arakatsu is considered one of Japan’s most influential nuclear physicists in this era and was only surpassed by Yoshio Nishina. According to all available information, Arakatsu was the ideal candidate for this demanding task. Like his colleague Nishina, Professor Arakatsu also completed a university degree in Europe in the 1920s. First he studied at the BerlinerUniversity as a student and later friend of Albert Einstein. He then continued his training at the Technical University in Zurich and finished it at the Cavendish Laboratory in Cambridge. In addition to his work on the decay of light nuclei, Arakatsu constructed his own functioning cyclotron in nineteen hundred and forty-one.

The search for alternative energy sources for the Kriegsmarine

The Japanese Navy initially dealt with nuclear energy, which at the time represented a young and esoteric science. They wanted to find out if this technology could provide a useful source of energy for warships and other naval vehicles. After the fatal oil embargo on Japan, the Navy urgently needed a replacement for petroleum. A fateful oneArticles which first lieutenant Murata in the journal Nitrocellulose aroused the Navy’s interest in the development of nuclear weapons. This initiative then went into the nuclear energy project of the shipbuilding office. This is not to be confused with the short-lived committee commissioned by the National Research Council and an independent operation of the Navyrepresented.

Conscious confidentiality within the research structures

The committee, to which Nishina herself also belonged, was deliberately not initiated into the Naval operation. As a result, he did not learn anything about Arakatsu’s research project for two years. The shipbuilding office’s project was officially revived in May nineteen hundred and forty-three. This happened shortly after the Ministry’s Foreign Intelligence Service agents had credible information aboutthe rapid progress of the nuclear weapons program of the United States. When all questions were clarified, Arakatsu and his team at Kyoto University received a considerable amount as an advance. In other reports, the team was even given an even higher sum, which was significantly more than the modest financing that the team was content with two years earlierhad to.

The designation and methodology of the F-Go project

The operation was officially referred to as an F-GO project. Similar to the designation of Nishina’s project, it is questionable what the F in F-Go stood for. Some sources claim that F is fluoride as in uranium hexafluoride. Others think the F is the abbreviation for splitting. In contrast to the Ni-Go project’s thermal diffusion method, the F-GO project relied on centrifuges forgaseous uranium. Arakatsu’s team believed this method would be more suitable for isotope separation of uranium-235.

The hierarchy and the scientists involved

Arakatsu was directly under-admiral Nitta Shigeru and Lieutenant Kitagawa Tetsuzo. It remains unclear to what extent Murata was involved after the project was resumed. In the university laboratory, Arakatsu’s closest associate was a young and bright master’s student named Sakae Shimuzu, who was twenty-five years younger than his mentor. Other remarkable members of ArakatsusTeam were later Nobel Prize winners and Nishina’s former student Doctor Yukawa. The Riken researcher Doctor Asao Sugimoto also belonged to the team. Doctor Minoru Kobayashi, an expert on particle physics and theoretical physics at the University of Osaka, was also involved. In addition, Doctor Shoichi Sakata, who for the Sakata model named after him, the PMNS matrix,Two-Meson theory and the much-vaunted work on theoretical physics was known.

The rare encounters between the competitors

Although Arakatsu and Nishina pursued common goals, they met strangely enough only a few times. One of these rare personal encounters took place in the late nineteen hundred forty-three. Arakatsu and other high-ranking personalities in the department visited the Riken. They wanted to admire the impeccable new facilities in the recently built building forty-nine. Shortly afterArakatsu and Nishina retreated to a corner of the lead. They exchanged a brief exchange of isotope separation of uranium.

The rivalry between the army and the navy hampers progress

Internal disputes within the armed forces, especially the deeply rooted tensions between the army and the Navy, undoubtedly hampered the progress of the Japanese atomic bomb project. Only in the autumn nineteen-four-four did the two partial forces put aside their differences. They joined forces to look at the Empire’s nuclear knowledgeadvance. In order to initiate the long-awaited alliance between the two weapons, the Army and Navy technology committee was established. Captain Mitsui, who co-founded the first version of the F-Go project, was commissioned to plan this cooperation in general.

The difficult cooperation between the armed forces

To the chagrin of all the researchers involved, the cooperation was anything but smooth from then on. The army and the Navy were not in agreement on budget issues, investigation techniques and research priorities, among other things. But finally, after more than a year of unattended negotiations, the divided parties agreed on a compromise. in springNineteen hundred forty-five, the naval officials admitted that the research conducted at the Riken was more extensive. They acknowledged that the knowledge and technical skills of the staff were higher than those of the University of Kyoto. The Navy and thus also Arakatsu’s team agreed to join Nishina’s team for the second fiddleplay. While Arakatsu’s team would continue their own studies on centrifuges, it should give Riken researchers a priority if necessary.

The distraction by side tasks delays research

Distracted by the side projects that the Riken scientists constantly assigned to them, Arakatsu’s team found it difficult to even create the basis for their research on centrifugal separation. This method is also known as ultracentrifugation. The work progressed with difficulty, but Arakatsu eventually presented the first draft of his plans for an ultracentrifugedone. This should work at sixty thousand revolutions per minute.

The technical functioning of the ultracentrifugation

Basically, centrifuges can be used to enrich uranium for reactors or to produce weapons-grade uranium. In the process, gaseous uranium hexafluoride is directed into a high-speed rotating ultracentrifuge. The heavier uranium atoms migrate to the machine’s periphery, while the lighter prefer to migrate towards their axis. theUranomats located near the axis and those that are further away are pumped separately and directed to another centrifuge. To achieve significant enrichment, the gas must pass through thousands of centrifuges arranged in cascades. Nowadays the production units can be quite small and the energy requirement is reasonable. he isfifty times lower than gas diffusion. For uranium enriched to ninety percent, used to make atomic bombs, it is necessary to continue enrichment well beyond the four percent required for reactor fuels.

The team’s scientific publications

In a treatise entitled Ultracentrifugal Separation, written by Shimuzu and published in November nineteen hundred forty-four, the team’s arguments for this method were further elaborated. The experiments of the team for enriching uranium-235 and isotope separation were documented therein.

The procurement of heavy water from Korea

As the Manhattan project’s intelligence committee reported in later years, the F-GO researchers allegedly secured an average of twenty grams of water per month from the Korean hydropower company in Hungnam. The work, founded by Jun Noguchi in the year nineteen hundred and twenty-six, first produced electrolytic ammonia for fertilizers. sometime inIn the following decade, it set up a heavy-water production facility, which was a by-product of ammonia.

The search for uranium ores in China

In the mid-1940s, the Japanese Navy also organized a series of independent missions to China. They wanted to expand or at least fill up the uranium ore stocks of Arakatsu and the Navy. When mining efforts were unsuccessful, the Japanese officers resorted to uranium oxide from the Chinese Navy’s supplies in Shanghai. Inventories were also usedChinese ceramic factories. Reports show that Lieutenant Miroshi Ishiwatari was chosen to guide the search for uranium oxide specifically for the F-GO project between March and May, nineteen-four. The uranium ores collected during this search were then delivered to the Kyoto University’s laboratory. There they were from the F-GO team by Doctor Kumura Kiichiinvestigated.

The Desperate Deeds of the Japanese Military

In the autumn of nineteen hundred and forty-four, the Japanese military’s confidence in the atomic bomb project began to wane. As the Ni-Go and F-Go teams continued their research, senior officials began experimenting with other forms of unorthodox weapons. In one of the strangest operations, Japanese technicians attached explosive devices to paraffin balloons, which were thenloaded onto military aircraft and dropped over American and Canadian territory. It should come as no surprise that most of the nine thousand dropped balloon bombs turned out to be unexploded. They either fell on the sea or on uninhabited areas or did not detonate at all. Even more bizarre was a suicide bombing involving a submarine and a light aircraftthese were to be loaded with plague infested fleas and were destined for San Diego. Fortunately, the end of the war prevented this plan from ever being carried out.

Wasting resources through pointless side projects

These unusual and impractical side tasks did not help advance Japanese atomic bomb research. Considering how much time, energy and resources have been wasted on these fruitless operations, the extent of the misplanning becomes clear. Sometime between the winter of nineteen forty-four and the beginning of nineteen forty-five, theShipbuilding office provides the F-Go team with an additional three hundred thousand yen in funding. To the chagrin of the office, the stately sum did little to increase the productivity of Arakatsu and his colleagues.

The dwindling motivation in the face of military defeat

As the war drew to a close and the Axis powers hung by a thread, motivation declined day by day. Like the Ni-Go team, the F-Go team had come to terms with the fact that, at best, they were still a decade away from mastering the atomic bomb. They now only did what was necessary to satisfy their superiors. At this timearakatsu, who had only worked out the last details of his design, was seriously behind schedule. He hadn’t even started developing a prototype for his ultracentrifuge. Even if he had started building the first model on time, it would not have been finished until August at the earliest.

The controversial claims about advanced centrifuges

However, an American researcher disagreed. In his opinion, Arakatsu had not only completed his prototype. The F-Go team had therefore reached an agreement with the Hokushine Electric Company, the Tokyo Keiki Electric Company and the engineering firm Sumitomo. It was about building an even bigger ultracentrifuge. This massive machine should be equipped withsensitive carbon fiber brushes and high-performance rotor drums made of rare earth metal alloys. It should be calibrated to rotate at a dizzying speed of one hundred thousand to one hundred and fifty thousand revolutions per minute. If such an order had been placed, this overambitious design would itself havetoday’s standards were unattainable. The most modern centrifuges today can only be operated at a speed of about fifty thousand revolutions per minute.

The last meeting and the end of the project

On the twenty-first of July, nineteen hundred and forty-five, the F-Go researchers and their sponsors met for the last time. During the meeting, Arakatsu’s team shared with his superiors what they and Nishina’s team had known from the beginning. The production of an atomic bomb before the end of the war was simply not possible. Although Arakatsu’s team, even without the financial support of the Navywould continue to contribute to general research on nuclear energy on its own, this admission meant the end. The official announcement of the dissolution of the project a week later sealed the end of the Empire’s nuclear weapons program during the war.

Historical classification and the lessons of failure

The failure of Japan’s nuclear weapons program impressively illustrates how structural problems and lack of resources can cause even ambitious scientific projects to fail. The rivalry between the army and the navy, the inadequate coordination of research efforts and the waste of resources on pointless side projects were decisive factors.In addition, Japan lacked the necessary raw materials and industrial infrastructure to successfully implement such a complex project. The historical documents show that the Japanese scientists did have the necessary theoretical knowledge, but failed due to practical and logistical challenges. These findings are still relevant today for theUnderstanding the limits of military research and development in totalitarian systems.