Stanislaw Ulam

Stanisław UlamStan UlamUlamStanislaw Marcin UlamUlam, S.M.S. M. UlamStanislas UlamStanislav UlamStanislaw M. UlamStanisław M. Ulam
Stanisław Marcin Ulam (13 April 1909 – 13 May 1984) was a Polish scientist in the fields of mathematics and nuclear physics.wikipedia
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Massacre of Lwów professors

Massacre of Lviv professorsMass murder of Polish scientists and writersMassacre of Lvov professors
Within two years, Józef Ulam and the rest of his family were victims of the Holocaust, Hugo Steinhaus was in hiding, Kazimierz Kuratowski was lecturing at the underground university in Warsaw, Włodzimierz Stożek and his two sons had been killed in the massacre of Lwów professors, and the last problem had been recorded in the Scottish Book.

Louse

licePhthirapteranit
Stefan Banach survived the Nazi occupation by feeding lice at Rudolf Weigl's typhus research institute.

Rudolf Weigl

Rudolf Stefan WeiglRudolf Weigl's typhus research instituteWeigl
Stefan Banach survived the Nazi occupation by feeding lice at Rudolf Weigl's typhus research institute.

Mount Holyoke College

Mt. Holyoke CollegeMount HolyokeMount Holyoke Seminary
She had been a French exchange student at Mount Holyoke College, whom he met in Cambridge.

Santa Fe, New Mexico

Santa FeSanta Fe, NMSante Fe
In October, he received an invitation to join an unidentified project near Santa Fe, New Mexico.

Los Alamos National Laboratory

Los AlamosLos Alamos Scientific LaboratoryLANL
The letter was signed by Hans Bethe, who had been appointed as leader of the theoretical division of Los Alamos National Laboratory by Robert Oppenheimer, its scientific director.

Joan Hinton

Joan
On the checkout card, he found the names of his Wisconsin colleagues, Joan Hinton, David Frisch, and Joseph McKibben, all of whom had mysteriously disappeared.

David H. Frisch

David FrischDavid. H. Frisch
On the checkout card, he found the names of his Wisconsin colleagues, Joan Hinton, David Frisch, and Joseph McKibben, all of whom had mysteriously disappeared.

Los Alamos, New Mexico

Los AlamosLos Alamos, NMLos Alamos Micropolitan Statistical Area
A few weeks after Ulam reached Los Alamos in February 1944, the project experienced a crisis.

Emilio Segrè

Emilio G. SegrèEmilio Gino SegrèEmilio Segre
In April, Emilio Segrè discovered that plutonium made in reactors would not work in a gun-type plutonium weapon like the "Thin Man", which was being developed in parallel with a uranium weapon, the "Little Boy" that was dropped on Hiroshima.

Plutonium

Puplutonium-239 239 Pu
In April, Emilio Segrè discovered that plutonium made in reactors would not work in a gun-type plutonium weapon like the "Thin Man", which was being developed in parallel with a uranium weapon, the "Little Boy" that was dropped on Hiroshima.

Nuclear reactor

nuclear reactorsreactorreactors
In April, Emilio Segrè discovered that plutonium made in reactors would not work in a gun-type plutonium weapon like the "Thin Man", which was being developed in parallel with a uranium weapon, the "Little Boy" that was dropped on Hiroshima.

Gun-type fission weapon

gun-typegun-type nuclear weaponearly nuclear weapons
In April, Emilio Segrè discovered that plutonium made in reactors would not work in a gun-type plutonium weapon like the "Thin Man", which was being developed in parallel with a uranium weapon, the "Little Boy" that was dropped on Hiroshima.

Thin Man (nuclear bomb)

Thin ManThin Man nuclear bombMark 2 nuclear bomb
In April, Emilio Segrè discovered that plutonium made in reactors would not work in a gun-type plutonium weapon like the "Thin Man", which was being developed in parallel with a uranium weapon, the "Little Boy" that was dropped on Hiroshima.

Little Boy

Hiroshima bombatomic bombfirst atomic bomb
In April, Emilio Segrè discovered that plutonium made in reactors would not work in a gun-type plutonium weapon like the "Thin Man", which was being developed in parallel with a uranium weapon, the "Little Boy" that was dropped on Hiroshima.

Atomic bombings of Hiroshima and Nagasaki

atomic bombing of HiroshimaHiroshimabombing of Hiroshima
In April, Emilio Segrè discovered that plutonium made in reactors would not work in a gun-type plutonium weapon like the "Thin Man", which was being developed in parallel with a uranium weapon, the "Little Boy" that was dropped on Hiroshima.

Hanford Site

Hanford Nuclear ReservationHanfordHanford nuclear site
This problem threatened to waste an enormous investment in new reactors at the Hanford site and to make slow separation of uranium isotopes the only way to prepare fissile material suitable for use in bombs.

Isotope separation

electromagnetic separationisotopic separationenriched
This problem threatened to waste an enormous investment in new reactors at the Hanford site and to make slow separation of uranium isotopes the only way to prepare fissile material suitable for use in bombs.

Fissile material

fissilefissionablefissile isotope
This problem threatened to waste an enormous investment in new reactors at the Hanford site and to make slow separation of uranium isotopes the only way to prepare fissile material suitable for use in bombs.

George Kistiakowsky

George B. KistiakowskyGeorge Bogdan KistiakowskyGeorge B. Kistiakowski
To respond, Oppenheimer implemented, in August, a sweeping reorganization of the laboratory to focus on development of an implosion-type weapon and appointed George Kistiakowsky head of the implosion department.

Implosion (mechanical process)

implosionimplodedimplode
The basic concept of implosion is to use chemical explosives to crush a chunk of fissile material into a critical mass, where neutron multiplication leads to a nuclear chain reaction, releasing a large amount of energy.

Neutron

neutronsfree neutronn
The basic concept of implosion is to use chemical explosives to crush a chunk of fissile material into a critical mass, where neutron multiplication leads to a nuclear chain reaction, releasing a large amount of energy.

Nuclear chain reaction

chain reactionpredetonationreactivity
The basic concept of implosion is to use chemical explosives to crush a chunk of fissile material into a critical mass, where neutron multiplication leads to a nuclear chain reaction, releasing a large amount of energy.

Seth Neddermeyer

Neddermeyer
Cylindrical implosive configurations had been studied by Seth Neddermeyer, but von Neumann, who had experience with shaped charges used in armor-piercing ammunition, was a vocal advocate of spherical implosion driven by explosive lenses.

Shaped charge

hollow chargeMunroe effectshaped-charge
Cylindrical implosive configurations had been studied by Seth Neddermeyer, but von Neumann, who had experience with shaped charges used in armor-piercing ammunition, was a vocal advocate of spherical implosion driven by explosive lenses.