Book summary “Superheavy”: summary

Introduction

You live in a world defined by the periodic table, yet the ultimate limits of matter remain hidden beyond the natural elements. You might assume that chemistry is a finished puzzle where every building block was discovered centuries ago. The reality is that modern scientists constantly push beyond nature to manufacture artificial elements that vanish in fractions of a second. Kit Chapman tells this story in Superheavy, chronicling the extreme physics, high-stakes Cold War rivalries, and human ambition driving the creation of new matter.

The race to discover superheavy elements reveals the triumphs, scientific frauds, and theoretical limits of modern chemistry.

The book guides you through six distinct phases of atomic discovery, moving from early nuclear fission to modern element factories. You will explore how researchers reshaped the periodic table, survived priority disputes, and hunted for the elusive island of stability. Along the way, the narrative answers several key questions about the nature of matter:

• How do physicists force reluctant atoms to fuse into heavier elements?
• What drove bitter Cold War rivals to race for periodic table supremacy?
• How did science survive infamous fabrication scandals in laboratories?
• Where does the periodic table finally end?

1. Foundations of Atomic Physics and Nuclear Fission

Modern chemistry began in the 1787 year when Antoine Lavoisier moved away from the ancient four-element Greek model. His work enabled Dmitri Mendeleev to organize the periodic table in the 1869 year by ordering elements by atomic weight and leaving intentional gaps.

Modern chemistry and atomic physics emerged from foundational discoveries regarding the nucleus, neutron bombardment, and nuclear fission.

Ernest Rutherford discovered the nucleus in the 1911 year and found protons in the 1919 year. James Chadwick subsequently isolated the neutron in the 1932 year to explain isotopes and atomic mass. Together, protons, neutrons, and electrons formed the definitive modern picture of the atom.

James Chadwick worked for ten days straight, sleeping only three hours a night, to successfully find the elusive neutron.

Enrico Fermi bypassed the need for expensive particle accelerators by bombarding targets with uncharged neutrons during the 1934 year of Fermi's neutron experiments. Because neutrons carry no electrical charge, they avoid electrostatic repulsion from the positively charged nucleus, known as the Coulomb barrier.

Fermi and his Via Panisperna Boys used a home-made neutron source to bombard uranium. They mistakenly believed they had created transuranic elements 93 and 94 when they had actually caused nuclear fission.

Fermi ran down the corridor in a frantic race to check his samples and later leaped into an institute fish pond after discovering that water slowed down neutrons effectively.

Lise Meitner and Otto Frisch correctly interpreted Otto Hahn's anomalous barium results as nuclear fission during the 1938 year of the discovery of nuclear fission and Kristallnacht. Meitner used the liquid drop model of the nucleus to explain how excess energy causes a heavy nucleus to deform into a dumbbell shape and snap apart.

Otto Hahn sent a letter to Lise Meitner asking for a fantastic explanation because he kept producing barium instead of element 93. This discovery upended Fermi's claims of transuranic elements and transformed nuclear physics into a race to build atomic weapons.

2. The Actinide Concept and Post-War Discoveries

Glenn Seaborg revolutionized heavy element classification and launched decades of transuranium element synthesis.

Using cyclotrons to bombard uranium and performing delicate chemical separations in Room 307 of Gilman Hall, Glenn Seaborg, Joseph Kennedy, and Arthur Wahl proved that element 94 was fissile and even more effective than uranium-235. You can understand a cyclotron as a giant gun that uses electric fields and powerful magnets to fire charged particles at extreme speeds, making it possible to smash atomic nuclei. A cyclotron fires charged particles in a spiral path inside semi-circular electrodes called dees. A giant magnet creates a Lorentz force that bends the particle track, while reversing polarity speeds the particles up with every completed loop until they hit a target.

On the night of 21 February 1941 during a wild storm, Arthur Wahl completed chemical tests in the attic space to confirm element 94, which was named plutonium.

Writer Alvin Schwartz inadvertently triggered an FBI visit in April 1945 after writing a Superman comic strip where the hero entered an atom smasher, having copied technical details directly from a 1935 Popular Mechanics article about Ernest Lawrence's cyclotron. The comic strip featured electrons moving at 100 million miles per hour with three million volts. Lawrence's actual 1932 device had a diameter of 69cm (27in) and an energy capacity of 4.8 million electron volts (MeV). Lawrence later built a 150cm (60in) wide cyclotron that won him the Nobel Prize, with 46 staff members sitting on the magnet in 1939.

The remote valleys of Tennessee were selected during World War II to house the massive industrial infrastructure needed to produce fissile materials for the atomic bomb. Chosen for its isolation, abundant hydroelectric power, and rail access, the Clinton Engineer Works rapidly transformed into a secret city housing 75,000 people. Homesteaders in villages like Scarboro and Wheat were given as little as six weeks to evacuate their homes as the U.S. Army took over a 27km or 17 miles stretch of land where families previously survived on $100 a year. The site featured massive installations such as the K-25 gaseous diffusion plant, Y-12 electromagnetic separation tracks, and the X-10 graphite reactor designed by Enrico Fermi to mass-produce plutonium.

Glenn Seaborg and Stanley Thompson pioneered ultramicrochemistry to safely separate and weigh microscopic quantities of plutonium-239 for the atomic bomb. Working behind lead brick barriers using mirrors and hair-thin quartz balances, the Chicago team developed separation processes using bismuth phosphate to extract plutonium. When a worker gripped a test tube too tightly and broke it in his palm, Seaborg personally collected about 1mg of plutonium from the scientist's hands using chemical extraction.

Glenn Seaborg revolutionized chemistry in 1944 by proposing that heavy elements like actinium, thorium, protactinium, uranium, and the transuranium elements form a second rare-earth-like series called actinides, placed below the lanthanides. Up until Seaborg's epiphany, heavy elements were placed incorrectly in the main periodic table as transition metals. Using his actinide theory, Seaborg's team at Berkeley successfully bombarded a plutonium target with helium ions in the 60-inch cyclotron on July 8, 1944, detecting strange alpha particles that proved the existence of elements 95 and 96.

Stanley Thompson, Al Ghiorso, and Glenn Seaborg successfully synthesized elements 97 and 98 by bombarding microscopic targets of americium and curium with helium ions in the cyclotron. On December 19, 1949, a target containing just 7mg of americium produced element 97, causing Seaborg's heart rate to spike so severely that doctors hospitalized him under suspicion of a heart attack. Using 8mg of curium, they produced a total yield of 5,000 atoms of element 98 on February 9, 1950.

Glenn Seaborg and Edwin McMillan were awarded the 1951 Nobel Prize in Chemistry for their discoveries in the chemistry of the transuranium elements. The award brought a financial windfall of $16,000, equivalent to $158,000. During the Nobel banquet, Seaborg attempted to answer King Gustaf VI Adolf's toast in his parents' native Swedish, only to discover the next day that his working-class immigrant upbringing had left him with a thick dialect that shocked the royal audience.

3. Thermonuclear Debris and Atom-at-a-Time Science

The hunt for higher elements expanded into thermonuclear bomb test debris and rapid chemical isolation techniques.

Air Force pilots flew jet fighters directly into radioactive mushroom clouds to capture particulate samples using specialized wing filters. Pilots navigated severe turbulence, extreme heat, and radiation fields to collect debris from thermonuclear detonations. Because samplers lacked reserve fuel tanks to accommodate the aerodynamic drag of atmospheric filters, they had to locate aerial tankers or execute difficult low-fuel landings.

During Operation Ivy, 28-year-old Captain Jimmy Robinson flew an F-84 Thunderjet into the Mike hydrogen bomb mushroom cloud, consuming 540kg of fuel per hour. After experiencing severe instrument failure and engine stalling, Robinson ran out of fuel and went down 5.5km north of the runway during a water landing attempt, becoming the first person killed in the hunt for an element.

Debris collected from thermonuclear test clouds underwent specialized acid dissolution and mass spectrography to reveal previously unseen heavy isotopes and elements. Instantaneous neutron fluxes of 10 24 neutrons per cm 2 in the core of the Ivy Mike explosion caused rapid neutron capture, forming stable heavy isotopes like plutonium-244 with an 80 million year half-life. This material was extracted from wing filters using long poles and processed in makeshift tents due to the reactive nature of coral reef debris. Los Alamos and Berkeley labs analyzed filters from the Ivy Mike blast, discovering alpha emissions that led to the identification of elements 99 (einsteinium) and 100 (fermium) from minuscule amounts of material within 9 days of Seaborg hearing about the filter.

The discovery of fermium initially suggested a natural limit to the periodic table due to extreme nuclear instability and spontaneous fission. Physicists observed that nuclei past element 100 became too unstable for beta decay and experienced spontaneous fission disasters, leading early liquid-drop models to predict that no heavier elements could exist. Researchers noted that fermium-259 undergoes a spontaneous fission disaster, breaking apart on its own in about 0.038 milliseconds. Later theoretical models by physicists like John Archibald Wheeler and Richard Feynman expanded these limits using quantum mechanics and electron orbital models, suggesting element 137 as a limit before element 173 crashed into a sea of negative energy particles.

Making element 101 required revolutionary techniques involving high-intensity accelerator beams, recoiling targets, and rapid transport chemistry. Because reaction cross sections dropped dramatically for heavier elements, Al Ghiorso increased cyclotron beam intensity a hundredfold to work with 3 billion atoms of einsteinium.

To isolate mendelevium, you follow specific experimental steps:

• Mount the target facing backward relative to the beam line so that newly synthesized atoms recoil onto a secondary catcher foil.
• Replace and collect the catcher foil periodically without disturbing the primary target or beam line.
• Dissolve the catcher foil rapidly in acid and perform chemical separation to isolate the desired element before it decays.

Al Ghiorso and Gregory Choppin rushed a test tube containing dissolved catcher foil in a supercharged Volkswagen Beetle from the Berkeley accelerator to Stanley Thompson's lab on 19 February 1955, famously triggering the laboratory's fire alarm with the alpha detector after confirming 17 atoms.

Collaborations using low-budget cyclotrons and plastic catcher nets competed with major American laboratories to synthesize and claim new elements. A joint team of scientists at the Nobel Institute for Physics in Stockholm used carbon ion beams on curium targets, bombarding 6 different targets for 30 minutes during a 1957 experiment, using plastic catchers that could be burned away. Their announcement of element 102 as nobelium sparked a fierce naming dispute and skepticism from Berkeley researchers who doubted their low-yield data.

4. Cold War Rivalry and the Transfermium Wars

Bitter priority disputes and Cold War politics between Berkeley and Dubna complicated the discovery of elements 102 through 108.

The discovery of elements 102 through 108 sparked the transfermium wars, a bitter priority dispute between the Berkeley and Dubna laboratories fueled by Cold War politics and differing experimental standards. While the US team relied on identifying precise alpha decay chains, the Soviet team at Dubna prioritized spontaneous fission signatures. Disagreements over data interpretation and naming rights resulted in rival periodic tables with competing names for elements 102, 103, 104, and 105. The Soviet team named element 104 after Igor Kurchatov, while Berkeley insisted on naming it rutherfordium.

Georgy Flerov recruited a young, inexperienced Armenian engineer named Yuri Oganessian to help lead the Soviet superheavy element program, forming a remarkably successful scientific partnership. During their initial job interview, Flerov bypassed physics entirely and asked Oganessian about his interests in sport, theatre, and music before hiring him. The Joint Institute for Nuclear Research was established in Dubna, a dedicated Russian science hub or naukograd, to create a nuclear research center capable of rivaling Berkeley. The Joint Institute for Nuclear Research sits in Dubna, a town featuring a 25m-tall statue of Lenin and seven laboratories dedicated to different areas of nuclear science.

Seeking element 102 by tracking daughter fermium atoms using a moving belt detector system called Hades, Al Ghiorso experienced a catastrophic pressure failure. Vic Viola was subjected to a six-month collection protocol where health physicists provided him a lunch pail to collect his waste following a 1959 radioactive accident that cost $58,500 and dispersed radioactive dust across 1,500m2 of the HILAC building.

The International Union of Pure and Applied Chemistry established the Transfermium Working Group in 1986 to objectively decide priority and naming rights for disputed superheavy elements. In 1991 the TWG released its official ruling on elements 101 through 109, sharing credit for several disputed elements between Berkeley and JINR while assigning others to GSI, requiring a minimum lifetime of 10^-14 seconds for an officially recognized nuclide. In 1993 Al Ghiorso received a phone call from the New York Times informing him that the TWG rulings officially credited him with discovering 11 elements, breaking an 185-year-old record previously held by British chemist Humphry Davy.

Following the intense conflicts of the Transfermium Wars, IUPAC established strict, formalized guidelines in 2016 governing how new chemical elements must be named. Fans petitioned for element 115 to be named lemmium after the late rock singer Lemmy of Motörhead, but the 157,438 supporters failed because a rock musician does not qualify under IUPAC categories.

When you propose an element name, you must follow these rules:

• Ensure the proposed element name ends in -ium, -ine, or -on depending on its chemical family.
• Select the element name exclusively from one of five categories: a scientist, a property, a mineral, a place, or a mythical creature.
• Verify that the name has not been used previously for any other chemical element.
• Submit the provisional name for public consultation to ensure it has no negative or offensive connotations across global languages.

5. The Island of Stability and Cold Fusion

Chemistry textbooks describe elements with predictable properties, but standard physics struggles when you examine the heaviest nuclei. Beyond known realms, nuclear forces face intense repulsion from crowded protons.

Theoretical magic numbers and cold fusion techniques unlocked the synthesis of heavier elements beyond the sea of instability.

Maria Goeppert Mayer and Hans Jensen published papers on the nuclear shell model in 1949. They used spin-orbit coupling to explain that filled shells create tighter binding and higher stability. When protons or neutrons fill these shells completely, they reach magic numbers of enhanced stability.

Maria Goeppert Mayer explained spin-orbit coupling by comparing nucleons to waltzers in a ballroom, where moving in coordinated directions minimizes required energy.

Researchers realized that creating a nucleus with a magic number of protons or neutrons would bypass the rapid radioactive decay typically seen in heavier elements. Theorists calculated that element 114 with 184 neutrons would be doubly magic. Glenn Seaborg and Georgy Flerov drew playful cartoons of element pioneers sailing off the end of the peninsula of stability to find the magic island.

Scientists scoured deep-sea manganese nodules, salt mines, subterranean tunnels, meteorites, and ocean brine, using neutron multiplicity counters and fission-track analyses. Despite detection limits reaching unprecedented precision, no natural superheavy elements were reliably discovered.

The Berkeley team set up neutron multiplicity counters inside a 250-metre deep tunnel dug by the Bay Area Rapid Transit system between Berkeley and Orinda.

Darleane Hoffman proved that trace amounts of primordial plutonium-244, heavier than uranium, survived from the formation of the Earth. By processing large amounts of pre-Cambrian bastnäsite ore containing high concentrations of cerium oxide, Hoffman isolated a minuscule sample of primordial plutonium using advanced mass spectrometry.

Darleane Hoffman obtained waste material from the Molybdenum Corporation of America and shipped her extracted sample to General Electric in New York for mass spectrometer analysis. In 1971, Hoffman proved the existence of natural plutonium-244, detecting 8 femtograms of plutonium in the 4.6 million years old pre-Cambrian bastnäsite rock.

Yuri Oganessian pioneered cold fusion as a reaction technique that required significantly less excitation energy, enabling the synthesis of heavier elements. By firing projectiles of similar size to heavy targets such as lead or bismuth, the microscopic corrections in mass act as a heat sink that steals excitation energy away from the newly formed compound nucleus.

While Georgy Flerov was on holiday in Siberia, Oganessian assembled his team and bombarded a lead target with argon ions, successfully creating a fermium isotope with a 1.1-second half-life in 1973.

The German laboratory GSI achieved breakthrough element discoveries by pioneering a cold fusion technique using heavy ion beams. While Berkeley and Dubna focused on traditional hot fusion, GSI utilized the Universal Linear Accelerator and the Separator for Heavy Ion Reaction Products to shoot beams like titanium, chromium, and iron into heavy targets, successfully producing elements 107, 108, and 109.

Between 12 and 17 February 1981, Münzenberg's team bombarded a bismuth target with titanium and observed decay chains for element 105, followed shortly by creating elements 107, 108, and 109 using chromium and iron beams.

6. Scientific Fraud and Completing the Seventh Row

Overcoming scientific fraud and extreme logistical hurdles enabled international collaborations to finalize the seventh row of the periodic table.

Victor Ninov perpetrated a major scientific fraud at Berkeley by fabricating data to falsely claim the discovery of element 118 in 1999 and 2001. Ninov used his custom analysis program Goosy to systematically alter background events and manually insert fabricated alpha decay chains into raw data files. Independent checks by other researchers and labs failed to reproduce the results, leading to a full internal investigation and Ninov's dismissal for scientific misconduct in 2002.

When Berkeley attempted to repeat the experiment, the decay chains vanished, and an audit of original data tapes revealed that the published events had been copy-pasted into text editors by Ninov. A theoretical cross section predicted by Robert Smolańczuk for element 118 was 670 picobarns, while only two fakes were uncovered out of 34 chains analyzed in GSI files.

The Dubna-Livermore collaboration successfully advanced hot fusion using calcium-48 beams, eventually leading to the independent confirmation of element 114 by Berkeley. By combining Russian and American expertise and utilizing a neutron-rich calcium-48 beam, the collaboration produced elements 114, 116, and 118 with extended half-lives. Berkeley researchers later independently confirmed the Dubna-Livermore data by calibrating their equipment to the reported energies.

In March 2009 at an American Chemical Society meeting, Ken Gregorich announced that Berkeley had just confirmed the discovery of element 114, effectively ending the legacy of the transfermium wars. The experiment produced an element 114 atom with 176 neutrons, falling 8 shy of the magic 184. The Livermore nuclear science programme included 235 scientists.

Producing superheavy elements like element 117 required procuring rare berkelium targets through painstaking international cooperation and high-security transport. Because berkelium has no commercial use, it is only produced as a byproduct of californium. Following years of persistence by Joe Hamilton, Oak Ridge produced 22 milligrams of berkelium during a californium campaign in 2008.

The berkelium sample was shipped on a Delta flight to Moscow, but missing documentation and customs interference forced it to make multiple Atlantic crossings—totaling 25,000 air miles—before arriving safely. The sample had a half-life of 327 days.

The Dubna-led collaboration successfully synthesized and confirmed elements 115, 117, and 118, filling the final gaps of the seventh row of the periodic table. After bombarding the berkelium target with a calcium-48 beam for 150 days, the Dubna-Livermore team announced the discovery of element 117, known as tennessine, in 2010. Subsequent experiments in 2012 inadvertently hit rogue spots of californium that had beta-decayed from berkelium, yielding an atom of element 118, or oganesson.

During the 2012 repetition of the element 117 experiment, a small amount of berkelium target beta-decayed into californium, resulting in the creation of an atom of element 118. The team announced 6 atoms of element 117 in April 2010, which had a half-life of 50 milliseconds. The effort involved 72 scientists across 6 institutions led by Yuri Oganessian, while IUPAC officially credited them with discovering elements 115, 117, and 118 in 2015.

Japan's RIKEN research institute achieved a century-long national dream by discovering element 113, named nihonium. Led by Kōsuke Morita, the RIKEN team used a linear accelerator called RILAC to bombard bismuth targets with zinc ions via cold fusion over thousands of hours of beam time to successfully synthesize element 113.

Kōsuke Morita visited local shrines and prayed during the experiment, placing exactly 113 yen as an offering to the gods. The discovery required 50 RIKEN scientists to spend 553 days of cumulative beam time, costing $3 million in electricity.

To overcome the plummeting cross-sections of titanium-50 beams, JINR in Dubna constructed the DC-280 cyclotron, known as the Superheavy Element Factory. Because titanium-50 yields lower cross-sections than calcium-48 when targeting new elements like 119 and 120, the Dubna team built a new cyclotron that is ten times more powerful in beam intensity and offers precise energy variation. This machine is designed to scale up production from a single atom a month to quantities that allow actual chemical investigation.

Nikolay Aksenov recalled the extreme logistical challenge of transporting the massive 1,100-tonne main magnet from Ukraine on a train through a conflict zone while hearing gunfire at the end of the phone line. The new facility projects a production rate of 100 atoms a day for lighter species.

Conclusion

The pursuit of superheavy elements unifies quantum mechanics, international diplomacy, and extreme engineering into a single quest to define the borders of matter. You now see how foundational nuclear physics, cold war rivalries, and theoretical islands of stability culminate in a complete seventh row of the periodic table.

Applying these lessons requires you to navigate rigorous scientific standards and collaborative frameworks.

1. Verify every anomalous signal independently through cross-facility replication before claiming a new discovery.
2. Separate your experimental data from theoretical bias by adhering to strict statistical thresholds for rare decay chains.
3. Respect international nomenclature protocols to resolve naming disputes through objective and transparent arbitration.
4. Design your detectors to operate on atom-at-a-time scales by utilizing rapid chemical separation and recoil techniques.
5. Anticipate relativistic effects when predicting the chemical behavior of elements at the extreme edge of the periodic table.

10 Key Ideas

1. Modern chemistry and atomic physics emerged from foundational discoveries regarding the nucleus, neutron bombardment, and nuclear fission.
2. Glenn Seaborg revolutionized heavy element classification and launched decades of transuranium element synthesis.
3. The hunt for higher elements expanded into thermonuclear bomb test debris and rapid chemical isolation techniques.
4. Bitter priority disputes and Cold War politics between Berkeley and Dubna complicated the discovery of elements 102 through 108.
5. Theoretical magic numbers and cold fusion techniques unlocked the synthesis of heavier elements beyond the sea of instability.
6. Overcoming scientific fraud and extreme logistical hurdles enabled international collaborations to finalize the seventh row of the periodic table.
7. Dmitri Mendeleev organized the periodic table by atomic weight, while Glenn Seaborg later introduced the actinide concept to properly classify heavy elements below the lanthanides.
8. The Transfermium Wars exposed intense international rivalries and naming disputes between American and Soviet laboratories racing to discover elements beyond fermium.
9. Theoretical physicists used quantum mechanics and nuclear shell models to predict an elusive island of stability driven by magic numbers of protons and neutrons.
10. Instances of severe scientific misconduct, such as fabricated data regarding element 118, demonstrated the critical need for independent cross-facility replication.