Ernest Rutherford

Brightwater

Ernest Rutherford was born on 30 August 1871 in Brightwater, a small settlement near Nelson on New Zealand's South Island. His father James had come from Perth in Scotland. His mother Martha was a schoolteacher from Hornchurch in Essex. They had twelve children. Ernest was the fourth, and the second son.

James Rutherford was a farmer and flax miller. The family was not wealthy, but Martha insisted on education. She taught in local schools and made sure her children understood what books were for. Ernest was sharp from the start. He won a scholarship to Nelson College, arriving in 1887 and becoming head boy in 1889. From there he won another scholarship to Canterbury College in Christchurch, part of the University of New Zealand, where he arrived in 1890.

Canterbury was where the ambition caught fire. He took his BA in 1892, his MA in Mathematics and Physical Science in 1893, and his BSc in Chemistry and Geology in 1894. He was working on the magnetic properties of iron exposed to high-frequency electrical discharges, building his own equipment, pushing at the edges of what was known. He applied for the 1851 Exhibition Scholarship, a research fellowship funded by the profits of the Great Exhibition, intended to bring the best minds from across the British Empire to study in England.

He didn't get it. The scholarship went to another candidate. Then that candidate withdrew, and the offer passed to Rutherford. According to the story that has followed him ever since, he was digging potatoes on the family farm in Brightwater when the telegram arrived. He threw down the spade. "That's the last potato I'll ever dig," he said. He was 23. He was going to Cambridge.

The Cavendish and Montreal

Rutherford arrived at Trinity College, Cambridge in 1895. He was among the first research students admitted under new rules that allowed graduates from other universities to study there. Before that, you had to have a Cambridge degree to do research at Cambridge. The older members of the college were not always welcoming to these "aliens," as they were called. Rutherford was a colonial farmer's son with a New Zealand accent and mud on his reputation before he'd started. He didn't care.

He worked at the Cavendish Laboratory under J.J. Thomson, who two years later would discover the electron and change physics forever. Rutherford's early work was on radio waves. He built a detector that could pick up signals at half a mile, briefly holding the distance record before Guglielmo Marconi overtook him. But it was Thomson's work on the ionisation of gases by X-rays that pulled Rutherford towards the questions that would define his life. What were atoms made of? What held them together? What happened when they fell apart?

In 1898, he left Cambridge for McGill University in Montreal, taking up the Macdonald Chair of Physics. He was 27. Over the next nine years at McGill, he did the work that won him the Nobel Prize. He identified and named alpha and beta radiation in 1899. Working with the chemist Frederick Soddy, he showed that radioactive decay was the spontaneous transmutation of one element into another, a process that released enormous energy. He discovered the concept of radioactive half-life. He named the gamma ray in 1903. He was mapping the invisible architecture of the atom, piece by piece, and he was doing it faster than anyone else in the world.

In 1900, he married Mary Newton in Christchurch during a trip back to New Zealand. Their daughter Eileen was born the following year. In 1907, he received an offer he had been hoping for. The chair of physics at the Victoria University of Manchester was vacant. He took it. He was heading back to England, to the city where everything would happen.

Manchester

Rutherford arrived in Manchester in 1907 as Langworthy Professor of Physics. He was 35. He already had a reputation. The Nobel Prize in Chemistry was announced the following year, in 1908, awarded for his work on radioactive disintegration done at McGill. He found the honour amusing. He was a physicist, not a chemist. At the Nobel banquet he joked that he had observed many transformations in his work with radioactivity, but none as rapid as his own transmutation from physicist to chemist.

The Manchester physics department became, under Rutherford, one of the most important laboratories in the history of science. He ran it the way he ran everything: loud, fast, relentless, and generous. He had a booming voice. He sang "Onward, Christian Soldiers" in the corridors. He attracted brilliant people and gave them room to work. What they did in that building over the next twelve years changed how we understand the physical world.

The first great Manchester experiment came in 1909. Rutherford set Hans Geiger and Ernest Marsden, a 20-year-old undergraduate, to work firing alpha particles at a thin sheet of gold foil. The expectation, based on J.J. Thomson's "plum pudding" model of the atom, was that the particles would pass straight through with only slight deflection. The atom, according to Thomson, was a ball of positive charge with electrons embedded in it like plums in a pudding. Alpha particles should sail through.

Most of them did. But some bounced back. A small number came back at angles greater than 90 degrees. Some came almost straight back the way they had come. Rutherford described the result later in a line that has become one of the most quoted in physics: "It was quite the most incredible event that has ever happened to me in my life. It was almost as incredible as if you fired a 15-inch shell at a piece of tissue paper and it came back and hit you."

It took him two years to work out what it meant. In 1911, he published the answer. The atom was not a ball of evenly spread charge. It was almost entirely empty space. Nearly all of its mass was concentrated in a tiny, dense core at the centre. His 1911 paper called it the "central charge." Within a year, the word nucleus had taken hold. The electrons orbited far away from it. The reason most alpha particles passed through the gold foil was that there was almost nothing there. The reason a few bounced back was that they had hit the nucleus head-on, and the nucleus, though unimaginably small, was unimaginably dense.

The nuclear model of the atom. Proposed in Manchester. Published from Manchester. The foundation of everything that followed in nuclear physics, from the bomb to the power station to the particle accelerator. All of it started with a sheet of gold foil and a farmer's son who wanted to know what was on the other side.

Splitting the Atom

The Manchester laboratory drew people from across the world. In 1912, a young Danish physicist named Niels Bohr arrived and began working on the implications of Rutherford's nuclear model. If the atom had a nucleus with electrons orbiting it, how did those orbits work? Why didn't the electrons spiral inward and crash? Bohr proposed that electrons could only occupy certain fixed orbits, and that they jumped between them by absorbing or emitting energy. He developed this model in Manchester and published it in 1913. It won him the Nobel Prize in Physics in 1922.

The same year Bohr published, Henry Moseley, another of Rutherford's Manchester researchers, used X-ray spectroscopy to show that the elements should be ordered by atomic number, not atomic weight. It was Moseley's Law, and it reordered the periodic table. Moseley was 25 years old. Two years later he was dead, killed by a sniper at Gallipoli on 10 August 1915. He was 27. The loss was so devastating to British science that the government was afterwards far more careful about letting scientists anywhere near the front. Too late for Moseley.

Rutherford spent part of the war working on anti-submarine detection for the Admiralty, but he kept the Manchester laboratory running. And in 1917, in between the war work, he did the experiment that the homepage card on this website refers to. He bombarded nitrogen gas with alpha particles and detected hydrogen nuclei, which he would later name protons, being ejected. He believed the nitrogen atoms had been disintegrated. It was Patrick Blackett, working under Rutherford at Cambridge in 1925, who confirmed what had actually happened: the nitrogen had been transmuted into oxygen. One element had become another. The first artificial nuclear transmutation in history. The dream of the alchemists, achieved not with potions and furnaces but with physics, in a laboratory in Manchester.

He published the results in 1919. By then he had already accepted the offer to return to Cambridge as Cavendish Professor of Physics, succeeding J.J. Thomson in the same role Thomson had held when Rutherford first walked into the Cavendish as a nervous colonial in 1895. He left Manchester that year. He had been there twelve years. In that time he had discovered the nucleus, mentored Bohr, lost Moseley, and split the atom. No other laboratory in any city in the world had a decade like it.

The Farmer's Son

At Cambridge, Rutherford continued to shape the future. Under his direction at the Cavendish, James Chadwick discovered the neutron in 1932 and won the Nobel Prize. The same year, John Cockcroft and Ernest Walton performed the first fully controlled splitting of an atomic nucleus, using a particle accelerator to break apart lithium. They won the Nobel Prize in 1951. The list of laureates who passed through Rutherford's laboratories, at Manchester and Cambridge combined, is extraordinary. Few if any scientists in history have trained and mentored so many Nobel Prize winners.

The honours accumulated. He was knighted in 1914. He received the Order of Merit in 1925. In 1931, he was raised to the peerage as Baron Rutherford of Nelson, taking his title from the town nearest to the farm where he had dug those last potatoes. He sat in the House of Lords. He advised the government. He was the most famous scientist in the British Empire.

He died on 19 October 1937 in Cambridge, aged 66. On 14 October his hernia had strangulated, but because he was a peer of the realm, protocol required a titled surgeon to operate. They waited roughly a day for Sir Thomas Dunhill to travel from Harley Street. The operation went ahead, but Rutherford never recovered. He died five days later of intestinal paralysis. The man who split the atom, killed by a waiting list of one. He was cremated at Golders Green Crematorium and his ashes were buried in the nave of Westminster Abbey, near Isaac Newton and Lord Kelvin, and not far from Charles Darwin. A farmer's son from Brightwater, lying among the greatest minds in British history.

New Zealand put him on the $100 note, their highest denomination. Element 104 on the periodic table, synthesised long after his death, was named rutherfordium in his honour. But the thing that matters most happened in Manchester. He came to this city in 1907 with a Nobel Prize already in hand and proceeded to do the most important work of his life. He found the nucleus. He split the atom. He built a laboratory that produced more Nobel laureates than most countries. He did it with a booming voice, a spade he had thrown away, and the conviction that if you fired enough particles at enough things, the universe would eventually tell you what it was made of.

A farmer's son from the far side of the world who walked into a Manchester laboratory and changed everything. That's a Manchester legend.