Homi J. Bhabha

• 1. Introduction

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  "I am burning with a desire to do physics." A student at Cambridge wrote those words to his father, and he meant every one of them. The student was Homi Jehangir Bhabha, the Indian theoretical physicist who is widely credited as the father of the Indian nuclear programme. His life ran along two tracks that rarely meet in a single person. One was rigorous science. The other was a devotion to music, painting and design that he never abandoned. How did a young man who begged to be left alone with physics end up advising a prime minister on atomic energy? Why did he build a strategy unlike the one any other country followed? And what did a man who spoke of peaceful power really think about the bomb? The answers begin in a wealthy household in Bombay, where the first signs of a scientist and an artist appeared side by side.

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• 2. Between Art and Engineering

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  At seventeen, Homi Bhabha's self-portrait won second place at the Bombay Art Society's exhibition, one of the most prestigious shows in the city. He had been born on the 30th of October 1909 into a wealthy Parsi family. His father, Jehangir Hormusji Bhabha, was a well-known lawyer. His mother, Meherbai Framji Panday, was a granddaughter of Sir Dinshaw Maneckji Petit. The boy was named Hormusji after his paternal grandfather, who served as Inspector-General of Education in Mysore. His early schooling came at Mumbai's Cathedral and John Connon School.

  Music filled the house. His paternal aunt, Meherbai Tata, owned a collection of Western classical records that included Beethoven, Mozart, Haydn and Schubert. Bhabha, his brother and a cousin made a ritual of playing them on the gramophone. He also took special violin and piano lessons, while the artist Jehangir Lalkala tutored him in sketching and painting.

  Science arrived through toys. Meccano sets could hold him for hours, and he preferred inventing his own models to following the booklets. By fifteen he had studied general relativity. He also spent time at the home of his uncle Dorabji Tata, chairman of the Tata Group and then one of the wealthiest men in India. There the boy overheard Dorabji talking with independence leaders such as Mahatma Gandhi and Motilal Nehru. He also heard business talk about steel, heavy chemicals and hydroelectric power. John Cockcroft later remarked that such conversations should have inspired a career as a scientific organizer.

  Bhabha passed the Senior Cambridge Examination with honours at fifteen but was too young to enter a college abroad. So he enrolled at Elphinstone College. In 1927 he moved to the Royal Institute of Science, where he sat through a public lecture by Arthur Compton. Compton would win the Nobel Prize in physics the following year for his 1923 discovery of the Compton effect. Bhabha later said that the lecture was where he first heard of cosmic rays, the subject of his future research.

  The next year he joined Gonville and Caius College at Cambridge, because his father and Dorabji insisted. They planned a degree in mechanical engineering, followed by a return to India as a metallurgist at the Tata Steel mills in Jamshedpur. His father relented and agreed to pay for mathematics instead, on one condition. Bhabha had to earn first class honours in the Mechanical Tripos. He sat that examination in June 1930 and the Mathematics Tripos two years later, passing both with first class honours.

  Cambridge also gave him room for everything else. He coxed his college boat in races and designed the cover of the college magazine, the Caian. He built sets for a student staging of Calderón's play Life is a Dream and for Mozart's Idomeneo, both put on by the Cambridge Musical Society. The English artist and critic Roger Fry praised his sketches, and Bhabha seriously considered becoming an artist. Then the work under way at the Cavendish Laboratory pulled him toward theoretical physics. When he registered as a research student in mathematics, he settled on the name Homi Jehangir Bhabha, which he kept for the rest of his life.

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• 3. Particles and Prizes

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  Electron-positron scattering carries Bhabha's name today, thanks to a calculation he published in the Proceedings of the Royal Society in 1935. It was the first time anyone worked out the cross-section for that process. He did his doctoral work at the Cavendish Laboratory under Ralph Fowler, in a building that was then the centre of several breakthroughs. James Chadwick had discovered the neutron. John Cockcroft and Ernest Walton had transmuted lithium with high-energy protons. Francis Aston had discovered chemical isotopes, and Patrick Blackett and Giuseppe Occhialini had used cloud chambers to show gamma radiation producing electron pairs and showers.

  Travel widened his circle. In 1932 a Rouse Ball travelling studentship took him to Copenhagen, Zurich and Utrecht. Niels Bohr's institute in Copenhagen was a major hub of theoretical physics. In Zurich, in July 1933, Bhabha wrote his first paper with Wolfgang Pauli, and it appeared in the Zeitschrift fur Physik that October. At Utrecht he visited Hans Kramers, who studied how electromagnetic waves interact with matter. That same year an Isaac Newton scholarship, which he held for three years, paid for time with Enrico Fermi at the Institute of Physics in Rome.

  The discovery of the positron in 1932, together with Dirac's hole theory, had helped create the field of high-energy physics. Bhabha made it the focus of his career and published more than fifty papers on it. He also played a key role in the early development of quantum electrodynamics. His doctorate arrived in 1935, for a thesis titled "On cosmic radiation and the creation and annihilation of positrons and electrons".

  In 1937 he and Walter Heitler wrote a paper on fast electrons and cosmic showers. It described how primary cosmic rays from space strike the upper atmosphere and produce the particles seen at ground level. They estimated the number of electrons in the cascade at different altitudes, and the numbers matched shower observations made a few years earlier by Bruno Rossi and Pierre Victor Auger. They also proposed that the penetrating part of cosmic radiation consisted of "heavy electrons", most of which "must have masses nearer to hundred times the electron mass". Seth Neddermeyer and Carl David Anderson independently reached similar conclusions.

  At that time, observers often confused muons with mesons. Heitler drew Bhabha's attention to Hideki Yukawa's 1935 paper on the meson, and Bhabha realized the heavy electron was the particle Yukawa had postulated. In a 1939 note to Nature he argued for the name "meson", true to its Greek roots, rather than Anderson's "mesotron". He also concluded that watching mesons would offer a simple experimental check on the time dilation predicted by Albert Einstein's theory of relativity.

  Recognition followed over the decades. Cambridge's Philosophical Society gave him the Hopkins Prize in 1948. He was nominated for the Nobel Prize for Physics in 1951 and again each year from 1953 to 1956. India awarded him the Padma Bhushan, its third-highest civilian honour, in 1954. He became a Foreign Honorary Fellow of the American Academy of Arts and Sciences in 1958 and served as President of the International Union of Pure and Applied Physics from 1960 to 1963. Nine universities gave him honorary doctorates, beginning with Patna in 1944 and ending with Padova in 1961.

  In 1939 a Royal Society grant offered him a place in P. M. S. Blackett's laboratory in Manchester. World War II broke out before he could take it up.

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• 4. Choosing India

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  C. V. Raman, a Nobel laureate, headed the Indian Institute of Science in Bengaluru, and he gave Bhabha a post as reader in physics. Bhabha had been in India for his annual vacation when the war began, and the institute became his base. In 1940 the Sir Dorabji Tata Trust backed his experimental cosmic ray research with a grant. He became a Fellow of the Royal Society in 1941 and the first Indian to receive the Adams Prize in 1942. At the 1941 meeting of the Indian Academy of Sciences, Raman introduced the 32-year-old as "the modern equivalent of Leonardo da Vinci". On the 20th of January 1942, Bhabha formally accepted a professorship and the leadership of the Cosmic Ray Research Unit. During those years he also worked with the mathematician B. S. Madhava Rao on equations for particles of higher spin. Physicists now call part of that work the Bhabha-Madhavarao theory.

  For a while he treated India as a waiting room. In 1940 he still described himself as "at present" in the physics department at Bangalore. In 1941 he told Robert Millikan he hoped the war would end soon, so that scientists could return to purely scientific activity under better conditions. Millikan could not invite him to Caltech, and wartime financial limits kept Wolfgang Pauli from bringing him to Princeton. Meanwhile, in Bengaluru, he met Vikram and Mrinalini Sarabhai in a group interested in Indian culture. Tours around the country deepened his regard for Indian architecture and art. By 1944 he wrote that, with proper appreciation and financial support, "it is one's duty to stay in one's own country."

  The turning point came in 1943, when he wrote to J. R. D. Tata about founding an institute for fundamental research. Tata replied that if Bhabha and his scientific friends produced concrete proposals backed by a sound case, the Sir Dorabji Tata Trust would probably respond. Bhabha told the astrophysicist Subrahmanyan Chandrasekhar that he wanted to "bring together as many outstanding scientists as possible". In March 1944 he sent a proposal to Sir Sorab Saklavata, chairman of the trust. He argued that India had capable physicists scattered across the country, and that a school of pure research would lift applied work in industry as well. He added that once nuclear energy was producing power, perhaps a couple of decades later, India would find its experts at home.

  The trustees accepted the proposal in April 1944. The Tata Institute of Fundamental Research began in June 1945, first within the cosmic ray unit in Bengaluru. By October it had moved to Bombay, whose government had shown interest in becoming a joint founder. The institute started with 6,000 square feet in the bungalow where Bhabha was born, and he made his office the very room of his birth. Inaugurating the Bombay premises in December 1945, the Governor, Sir John Colville, said he could not imagine "a better combination for progress" than great wealth, individual initiative and government support. In 1948 the institute moved into the old buildings of the Royal Yacht Club.

  Its former director M. G. K. Menon recalled that the budget grew by about 30 percent a year over the first decade and about 15 percent a year over the second. Bhabha himself had stopped publishing scientific papers by 1954, though he kept up a stream of administrative work to expand the place. A cosmic ray group under Bernard Peters became the first to identify K minus strange particles. Bhabha remained director until his death in 1966. Some research groups in nuclear chemistry and metallurgy were later moved to Trombay, where they became the foundation of a very different and much larger enterprise.

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• 5. The Thorium Strategy

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  On the 26th of April 1948, Bhabha wrote to Prime Minister Jawaharlal Nehru that atomic energy should be run by a very small, high-powered body of about three people. It would hold executive power and answer directly to the Prime Minister. The Atomic Energy Commission was established on the 10th of August 1948, and Nehru named Bhabha its first chairman. S. S. Bhatnagar and K. S. Krishnan were the other two members. Nehru ruled that the commission's workings were state secrets. He feared that others would gain from the research before India did, and that partner countries would refuse to cooperate if results became public.

  The scholar George Perkovich observed that this secrecy left the bond between the two men as the only real check on the programme. Instead of being watchful, it was friendly. Bhabha, twenty years younger, wrote to "Dear Bhai", meaning Dear Brother, and Nehru answered with "My dear Homi". Indira Gandhi recalled that her father always made time for Bhabha, whose talk offered Nehru warm moments that a politician rarely finds.

  In 1954 Bhabha asked the government for a new laboratory devoted to technology development, since the work had outgrown the Tata Institute. About 1200 acres at Trombay were acquired from the Bombay Government, and the Atomic Energy Establishment, Trombay began functioning that year. Bhabha also became secretary of the new Department of Atomic Energy, which answered directly to the Prime Minister. H. N. Sethna later said that before that date the commission had only surveyed radioactive minerals and built plants to process monazite. It had also done limited work in electronics and the chemical analysis of minerals. With the department in place, Bhabha set priorities with great independence, and through the 1950s and early 1960s Parliament and the public barely debated nuclear policy.

  His boldest idea was to build India's future on thorium. He presented it in November 1954 at a New Delhi conference on peaceful atomic energy, and the government formally adopted it in 1958 as the three-stage programme. Bhabha reasoned that India held over 500,000 tons of readily extractable thorium, while its known uranium reserves were less than a tenth of that. Reactors burning natural uranium would come first and yield plutonium. A second generation would use that plutonium to make power while turning thorium into uranium-233. The third generation would be breeders. No other country shaped its programme around thorium.

  The hardware followed. In 1952 the government-owned Indian Rare Earths Limited was set up to extract rare earths and thorium from the monazite sands of Kerala, with Bhabha as a director. In August 1956 the one-megawatt "swimming-pool" research reactor APSARA started up, making India the first Asian country besides the Soviet Union with a reactor. Britain's atomic energy authority supplied the fuel, and Bhabha secured good terms partly through his friendship with Cockcroft. That year India and Canada also agreed to build a heavy-water research reactor at Trombay, and Bhabha's friendship with W. B. Lewis, who headed Canada's atomic energy agency, helped close the deal. Named CIRUS, it went critical on the 10th of July 1960. At forty megawatts it was the highest-output reactor in Asia, and it became India's first source of plutonium. It also served as the prototype for the CANDU design.

  A heavy water plant at Nangal, producing 14 metric tonnes per year, began operating on the 2nd of August 1962 to supply CIRUS. In July 1958 Bhabha decided to build a plutonium reprocessing plant at Trombay. Construction of the Phoenix plant began in 1961 and finished in mid-1964. Together with CIRUS it produced India's first weapons-grade plutonium.

  Still, India had not generated any nuclear electricity. In 1962 General Electric was hired to build two light water reactors at Tarapur. They ran on enriched uranium, so they sat outside the three-stage plan. The American loan was $80 million at 0.75 percent interest, and Bhabha negotiated that international safeguards would cover only the Tarapur facility. M. R. Srinivasan, a later chairman of the commission, said a seasoned diplomat would have been proud of that result.

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• 6. The Bomb Question

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  In Geneva in 1955, Bhabha presided over the United Nations Conference on the Peaceful Uses of Atomic Energy. A year later the International Atomic Energy Agency's draft statute, dated the 10th of September 1956, would have had plutonium and other special fissionable materials deposited with the agency, which would decide what to release. At a conference on the 27th of September 1956, Bhabha argued that states had an "inalienable right" to produce and hold the fissionable material for their peaceful power programmes. The final statute required only safeguards on materials and reactors. The American chairman Glenn Seaborg recalled that Bhabha was "not easy to argue with" and called him "a very imposing presence".

  Bhabha knew those safeguards were no guarantee. In a speech on the 27th of September 1957 he warned that technically advanced states might take agency help while running separate, unsupervised programmes of their own. In December 1959, worried by a possible Chinese weapons programme, he told a parliamentary committee that India could build nuclear weapons without outside help. In 1960 he told Nehru and the visiting consultant Kenneth Nichols it would take "about a year". A 1964 American State Department intelligence report found no direct evidence of a weapons programme. It added that it was "probably no accident" that everything India had done would suit one if the country ever chose to start.

  A year after Bhabha's death, Cockcroft said in a memorial lecture that Bhabha always followed his government's declared policy against weapons. Yet he thought Bhabha's private attitude "somewhat ambivalent" and believed he wanted India able to make plutonium bombs if the government asked. Menon replied that the reprocessing plant had been misunderstood, since the decision to build it came before the 1962 war with China. In a 2006 interview, P. K. Iyengar, another former chairman, said Bhabha had wanted a nuclear weapons state from the very beginning.

  China's nuclear test on the 16th of October 1964 changed the tone. Bhabha began publicly calling for nuclear explosives, even though in London on the 4th of October he had said he did not expect the decision to be taken. Prime Minister Lal Bahadur Shastri, Nehru's successor, wanted security guarantees from the existing nuclear powers instead. Bhabha's claim that India could build a device in eighteen months was widely accepted, but physicist Raja Ramanna said in 1996 that he did not think it possible. By 1965 Bhabha himself had raised his estimate to at least five years.

  In an All India Radio broadcast a week after the test, Bhabha said a two-megaton explosion would cost about $600,000. Producing the same force with ordinary TNT would cost around $300 million. That figure ignored reactors, reprocessing plants and everything else a weapons programme needs, yet the pro-bomb lobby kept using it. The Hindu nationalist Jana Sangh complained that India had missed its chance to act before China did.

  A six-hour cabinet discussion followed. Swaran Singh and S. K. Patil backed Bhabha, who attended as an observer, and only two ministers opposed him. Shastri authorized him to estimate what an underground explosion would involve. But Shastri was a Gandhian with a strong moral revulsion toward such weapons, and the country faced a food crisis. At a November 1964 meeting of the All India Congress Committee, he put the cost of one bomb at 400 to 500 million rupees, over two hundred times Bhabha's number. He warned that India could not stop at one or two bombs. The Hindustan Times called his success against the majority "nothing short of a miracle". Bhabha answered that his figures came from an American study of peaceful explosions for civil engineering.

  In the Lok Sabha on the 23rd and the 24th of November 1964, speakers generally accepted the eighteen-month timeline. Parliament deferred any decision and moved instead to speed up the technology and know-how that would allow a weapons programme later. Historians see here the start of India's "nuclear option". On the 27th of November the Jana Sangh moved for weapons, and Shastri won a voice vote against it. He then said, for the first time, that India's nonmilitary work would include peaceful "nuclear devices", and he credited Bhabha for the idea. Sethna later said Bhabha got approval for theoretical studies only. Ramanna was blunter in 1997: "An explosion is an explosion, a gun is a gun, whether you shoot at someone or shoot at the ground."

  After the 1965 war with Pakistan, pressure for the bomb grew. Bhabha told an interviewer, "The emergency changed nothing. Why should it?" Historians read this as a sign that technology, not policy, was the real constraint. Between 1964 and 1965 he also met US officials in secret, exploring whether the American commission could supply plutonium and device designs under Project Plowshare. The Nuclear Nonproliferation Treaty closed that path. After Bhabha's death, scientists at the Bhabha Atomic Research Centre and the Defence Research and Development Organization began work on the device used in the 1974 Pokhran test.

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• 7. Patron of the Arts

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  Vienna owed its place as home of the International Atomic Energy Agency partly to Bhabha's love of opera. He lobbied for the city because it would let him attend the state opera during agency meetings. His brother Jamshed said the arts were never mere relaxation to him. They were among the most serious pursuits of life, and in Bhabha's own words they were what "made life worth living".

  He kept painting. Abstract works he had made in England during the 1930s hung on the walls of his house. He also collected works by Pablo Picasso and repeatedly invited the painter to visit India. At home he was a key patron of the Progressive Artists' Group, formed in Bombay in 1947 to find new ways of expressing India's post-colonial identity. Its members included F. N. Souza, M. F. Husain, Tyeb Mehta, K. H. Ara and S. H. Raza. Bhabha chose some of their early works for the Tata Institute's collection.

  In 1962 the Institute inaugurated an art gallery designed by Helmuth Bartsch of the Chicago firm Holabird and Root. Few scientific institutions anywhere keep such a collection of contemporary Indian art. It was opened to the public in 2018.

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• 8. Crash and Afterlife

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  On the 24th of January 1966, Air India Flight 101, a Boeing 707-420, flew into terrain near Mont Blanc while trying to land at Geneva Airport. All 106 passengers, Bhabha among them, and 11 crew members died. He was 56. The official explanation was a misunderstanding between Geneva air traffic control and the pilots about the aircraft's position relative to the mountain. At a ceremony of mourning, Prime Minister Indira Gandhi said he had his most creative years ahead of him. She added, "We mourn a great son of India."

  Theories about the crash have multiplied since. One claims the Central Intelligence Agency was involved in crippling India's nuclear programme. In 2013 Gregory Douglas, a journalist the source describes as a conspiracy theorist, forger and holocaust denier, published Conversations with the Crow. He said a former agent named Robert Crowley had told him in telephone calls in 1993 that the agency killed both Bhabha and Shastri in 1966, thirteen days apart, with a bomb in the cargo hold. Conspiracy theorists also point to the death of Vikram Sarabhai, who showed no sign of illness before a heart attack and was cremated without an autopsy. In 2012 an Indian diplomatic bag holding calendars and a personal letter was recovered near the crash site.

  The institutions he left behind carry his name. The Atomic Energy Establishment at Mumbai was renamed the Bhabha Atomic Research Centre. In 1967 the Tata Institute showed an exhibition on his life at the Royal Society, later moved to its auditorium foyer. Indira Gandhi inaugurated the Homi Bhabha Auditorium on the 9th of November 1968. The radio telescope at Ooty, among the world's largest steerable telescopes, was built at his initiative in 1970. The Department of Atomic Energy under his watch gave early funding to the Tata Memorial Hospital, the Indian Cancer Research Centre, the Saha Institute of Nuclear Physics and the Physical Research Laboratory in Ahmedabad. He also helped Vikram Sarabhai set up the Indian National Committee for Space Research. Homi Bhabha Fellowships have been awarded since 1967, and the Homi Bhabha National Institute and the Homi Bhabha Centre for Science Education carry his name.

  He also reached screens. The 2022 web series Rocket Boys, inspired by the lives of Bhabha, Vikram Sarabhai and A. P. J. Abdul Kalam, cast Jim Sarbh as Bhabha, and a second season followed in 2023. The 2025 spy thriller Saare Jahan Se Accha, starring Pratik Gandhi, uses his death in its early plot as the reason for the formation of R&AW.

  Mehrangir, the sprawling colonial bungalow on Malabar Hill where he spent most of his life, passed to his brother Jamshed. Jamshed left the house and its contents to the National Centre for the Performing Arts, which auctioned the property for Rs 372 crores in 2014 to fund the centre. The owner, Smita-Crishna Godrej of the Godrej family, demolished it in June 2016, despite efforts to preserve it as a memorial to Homi Bhabha.

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