Institute of Physics on Via Panisperna

Institute of Physics on Via Panisperna. The Institute of Physics on Via Panisperna was the physics department of the University of Rome La Sapienza, located on the historic street of Via Panisperna in Rome. Under the leadership of Orso Mario Corbino and the groundbreaking work of Enrico Fermi, it became a world-renowned center for nuclear physics in the 1930s. The institute is most famous for the pioneering experiments of its young research group, which led to the discovery of slow neutrons and the subsequent development of the nuclear reactor.

History and Foundation

The institute’s modern era began in 1926 when Orso Mario Corbino, a prominent physicist and politician, became director of the University of Rome La Sapienza's physics institute. Recognizing the need to revitalize Italian physics, Corbino successfully recruited the young prodigy Enrico Fermi in 1927 to a professorship in theoretical physics. Corbino secured funding and political support, transforming the previously modest laboratory into a leading research facility. The institute’s location in a former monastery on Via Panisperna provided the physical space for this ambitious endeavor. This period coincided with the rise of fascism under Benito Mussolini, whose regime initially supported scientific prestige projects.

The Via Panisperna Boys

The core research team, later nicknamed the "Via Panisperna boys", was a close-knit group of brilliant young scientists assembled by Fermi. The initial members included experimentalist Franco Rasetti, theorist Edoardo Amaldi, and chemist Emilio Segrè. They were later joined by the enigmatic genius Ettore Majorana and other collaborators like Oscar D'Agostino. The group’s informal, collaborative spirit, combined with Fermi’s unparalleled ability to bridge theory and experiment, created an exceptionally productive environment. Their camaraderie was legendary, with Fermi often referred to as "the Pope" due to his perceived infallibility in physics.

Scientific Research and Discoveries

The group’s early work focused on spectroscopy and quantum statistics, but a pivotal shift occurred following the discovery of the neutron by James Chadwick in 1932. The team began bombarding elements with alpha particles from a radon-beryllium source, studying induced radioactivity. In 1934, following work by Irène Joliot-Curie and Frédéric Joliot, they systematically irradiated nearly every element on the periodic table. Their seminal breakthrough came in October 1934 when they discovered that passing neutrons through a moderator like paraffin wax or water dramatically increased their ability to induce radioactivity, a phenomenon they termed the effect of "slow neutrons". This discovery was crucial for the future development of nuclear fission and chain reactions.

Facilities and Equipment

The institute’s laboratories were housed in the old Convent of San Lorenzo in Panisperna. While not as lavishly equipped as some foreign counterparts, the team ingeniously used available resources. Key apparatus included a strong electromagnet for spectroscopic studies and a cloud chamber for particle detection. Their most vital tool was a 1-gram source of radium provided by the Italian National Research Council, which was used to produce neutrons via alpha particle bombardment of beryllium. The workshop skills of Franco Rasetti and the glassblowing expertise of technician Giuseppe Occhialini were instrumental in constructing and maintaining their experimental setups.

Later History and Legacy

The group began to disperse in the late 1930s due to anti-Semitic laws in Italy, which affected Emilio Segrè, and the allure of positions abroad. Enrico Fermi emigrated to the United States in 1938, receiving the Nobel Prize in Physics that year for his work on slow neutrons. The institute’s activities in nuclear physics effectively ended with World War II. However, its legacy was profound: its alumni, particularly Edoardo Amaldi, were foundational in establishing CERN and the European Space Agency. The discoveries made on Via Panisperna directly enabled the Manhattan Project and the dawn of the nuclear age. The original building now houses a museum and the historical archives of the Italian National Institute of Nuclear Physics. Category:Research institutes in Italy Category:Nuclear physics Category:History of physics