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  • richardmitnick 2:48 pm on February 7, 2019 Permalink | Reply
    Tags: A massive leap forward in nuclear physics, Lise Meitner, Nuclear fission, , , She was excluded from the victory celebration [The Nobel Prize] because she was a Jewish woman, , Today Lise Meitner remains obscure and largely forgotten   

    From The Conversation: “Lise Meitner — the forgotten woman of nuclear physics who deserved a Nobel Prize” 

    Conversation
    From The Conversation

    February 7, 2019
    Timothy J. Jorgensen

    Nuclear fission – the physical process by which very large atoms like uranium split into pairs of smaller atoms – is what makes nuclear bombs and nuclear power plants possible. But for many years, physicists believed it energetically impossible for atoms as large as uranium (atomic mass = 235 or 238) to be split into two.

    That all changed on Feb. 11, 1939, with a letter to the editor of Nature – a premier international scientific journal – that described exactly how such a thing could occur and even named it fission. In that letter, physicist Lise Meitner, with the assistance of her young nephew Otto Frisch, provided a physical explanation of how nuclear fission could happen.

    It was a massive leap forward in nuclear physics, but today Lise Meitner remains obscure and largely forgotten.

    3
    Lise Meitner (7 November 1878 – 27 October 1968) Smithsonian Institution

    She was excluded from the victory celebration because she was a Jewish woman. Her story is a sad one.

    What happens when you split an atom

    Meitner based her fission argument on the “liquid droplet model” of nuclear structure – a model that likened the forces that hold the atomic nucleus together to the surface tension that gives a water droplet its structure.

    She noted that the surface tension of an atomic nucleus weakens as the charge of the nucleus increases, and could even approach zero tension if the nuclear charge was very high, as is the case for uranium (charge = 92+). The lack of sufficient nuclear surface tension would then allow the nucleus to split into two fragments when struck by a neutron – a chargeless subatomic particle – with each fragment carrying away very high levels of kinetic energy. Meisner remarked: “The whole ‘fission’ process can thus be described in an essentially classical [physics] way.” Just that simple, right?

    Meitner went further to explain how her scientific colleagues had gotten it wrong. When scientists bombarded uranium with neutrons, they believed the uranium nucleus, rather than splitting, captured some neutrons. These captured neutrons were then converted into positively charged protons and thus transformed the uranium into the incrementally larger elements on the periodic table of elements – the so-called “transuranium,” or beyond uranium, elements.

    Some people were skeptical that neutron bombardment could produce transuranium elements, including Irene Joliot-Curie – Marie Curie’s daughter – and Meitner. Joliot-Curie had found that one of these new alleged transuranium elements actually behaved chemically just like radium, the element her mother had discovered. Joliot-Curie suggested that it might be just radium (atomic mass = 226) – an element somewhat smaller than uranium – that was coming from the neutron-bombarded uranium.

    Meitner had an alternative explanation. She thought that, rather than radium, the element in question might actually be barium – an element with a chemistry very similar to radium. The issue of radium versus barium was very important to Meitner because barium (atomic mass = 139) was a possible fission product according to her split uranium theory, but radium was not – it was too big (atomic mass = 226).

    7
    When a neutron bombards a uranium atom, the uranium nucleus splits into two different smaller nuclei. Stefan-Xp/Wikimedia Commons, CC BY-SA

    Meitner urged her chemist colleague Otto Hahn to try to further purify the uranium bombardment samples and assess whether they were, in fact, made up of radium or its chemical cousin barium. Hahn complied, and he found that Meitner was correct: the element in the sample was indeed barium, not radium. Hahn’s finding suggested that the uranium nucleus had split into pieces – becoming two different elements with smaller nuclei – just as Meitner had suspected.

    As a Jewish woman, Meitner was left behind

    Meitner should have been the hero of the day, and the physicists and chemists should have jointly published their findings and waited to receive the world’s accolades for their discovery of nuclear fission. But unfortunately, that’s not what happened.

    Meitner had two difficulties: She was a Jew living as an exile in Sweden because of the Jewish persecution going on in Nazi Germany, and she was a woman. She might have overcome either one of these obstacles to scientific success, but both proved insurmountable.

    5
    Lise Meitner and Otto Hahn in Berlin, 1913.

    Meitner had been working as Hahn’s academic equal when they were on the faculty of the Kaiser Wilhelm Institute in Berlin together. By all accounts they were close colleagues and friends for many years. When the Nazis took over, however, Meitner was forced to leave Germany. She took a position in Stockholm, and continued to work on nuclear issues with Hahn and his junior colleague Fritz Strassmann through regular correspondence. This working relationship, though not ideal, was still highly productive. The barium discovery was the latest fruit of that collaboration.

    Nuclear fission – the physical process by which very large atoms like uranium split into pairs of smaller atoms – is what makes nuclear bombs and nuclear power plants possible. But for many years, physicists believed it energetically impossible for atoms as large as uranium (atomic mass = 235 or 238) to be split into two.

    That all changed on Feb. 11, 1939, with a letter to the editor of Nature – a premier international scientific journal – that described exactly how such a thing could occur and even named it fission. In that letter, physicist Lise Meitner, with the assistance of her young nephew Otto Frisch, provided a physical explanation of how nuclear fission could happen.

    It was a massive leap forward in nuclear physics, but today Lise Meitner remains obscure and largely forgotten. She was excluded from the victory celebration because she was a Jewish woman. Her story is a sad one.
    What happens when you split an atom

    Meitner based her fission argument on the “liquid droplet model” of nuclear structure – a model that likened the forces that hold the atomic nucleus together to the surface tension that gives a water droplet its structure.

    She noted that the surface tension of an atomic nucleus weakens as the charge of the nucleus increases, and could even approach zero tension if the nuclear charge was very high, as is the case for uranium (charge = 92+). The lack of sufficient nuclear surface tension would then allow the nucleus to split into two fragments when struck by a neutron – a chargeless subatomic particle – with each fragment carrying away very high levels of kinetic energy. Meisner remarked: “The whole ‘fission’ process can thus be described in an essentially classical [physics] way.” Just that simple, right?

    Meitner went further to explain how her scientific colleagues had gotten it wrong. When scientists bombarded uranium with neutrons, they believed the uranium nucleus, rather than splitting, captured some neutrons. These captured neutrons were then converted into positively charged protons and thus transformed the uranium into the incrementally larger elements on the periodic table of elements – the so-called “transuranium,” or beyond uranium, elements.

    Some people were skeptical that neutron bombardment could produce transuranium elements, including Irene Joliot-Curie – Marie Curie’s daughter – and Meitner. Joliot-Curie had found that one of these new alleged transuranium elements actually behaved chemically just like radium, the element her mother had discovered. Joliot-Curie suggested that it might be just radium (atomic mass = 226) – an element somewhat smaller than uranium – that was coming from the neutron-bombarded uranium.

    Meitner had an alternative explanation. She thought that, rather than radium, the element in question might actually be barium – an element with a chemistry very similar to radium. The issue of radium versus barium was very important to Meitner because barium (atomic mass = 139) was a possible fission product according to her split uranium theory, but radium was not – it was too big (atomic mass = 226).
    When a neutron bombards a uranium atom, the uranium nucleus splits into two different smaller nuclei. Stefan-Xp/Wikimedia Commons, CC BY-SA

    Meitner urged her chemist colleague Otto Hahn to try to further purify the uranium bombardment samples and assess whether they were, in fact, made up of radium or its chemical cousin barium. Hahn complied, and he found that Meitner was correct: the element in the sample was indeed barium, not radium. Hahn’s finding suggested that the uranium nucleus had split into pieces – becoming two different elements with smaller nuclei – just as Meitner had suspected.
    As a Jewish woman, Meitner was left behind

    Meitner should have been the hero of the day, and the physicists and chemists should have jointly published their findings and waited to receive the world’s accolades for their discovery of nuclear fission. But unfortunately, that’s not what happened.

    Meitner had two difficulties: She was a Jew living as an exile in Sweden because of the Jewish persecution going on in Nazi Germany, and she was a woman. She might have overcome either one of these obstacles to scientific success, but both proved insurmountable.

    Meitner had been working as Hahn’s academic equal when they were on the faculty of the Kaiser Wilhelm Institute in Berlin together. By all accounts they were close colleagues and friends for many years. When the Nazis took over, however, Meitner was forced to leave Germany. She took a position in Stockholm, and continued to work on nuclear issues with Hahn and his junior colleague Fritz Strassmann through regular correspondence. This working relationship, though not ideal, was still highly productive. The barium discovery was the latest fruit of that collaboration.

    Yet when it came time to publish, Hahn knew that including a Jewish woman on the paper would cost him his career in Germany. So he published without her, falsely claiming that the discovery was based solely on insights gleaned from his own chemical purification work, and that any physical insight contributed by Meitner played an insignificant role. All this despite the fact he wouldn’t have even thought to isolate barium from his samples had Meitner not directed him to do so.

    Hahn had trouble explaining his own findings, though. In his paper, he put forth no plausible mechanism as to how uranium atoms had split into barium atoms. But Meitner had the explanation. So a few weeks later, Meitner wrote her famous fission letter to the editor, ironically explaining the mechanism of “Hahn’s discovery.”

    Even that didn’t help her situation. The Nobel Committee awarded the 1944 Nobel Prize in Chemistry “for the discovery of the fission of heavy nuclei” to Hahn alone. Paradoxically, the word “fission” never appeared in Hahn’s original publication, as Meitner had been the first to coin the term in the letter published afterward.

    A controversy has raged about the discovery of nuclear fission ever since, with critics claiming it represents one of the worst examples of blatant racism and sexism by the Nobel committee. Unlike another prominent female nuclear physicist whose career preceded her – Marie Curie – Meitner’s contributions to nuclear physics were never recognized by the Nobel committee. She has been totally left out in the cold, and remains unknown to most of the public.

    6
    Meitner received the Enrico Fermi Award in 1966. Her nephew Otto Frisch is on the left. IAEA, CC BY-SA

    After the war, Meitner remained in Stockholm and became a Swedish citizen. Later in life, she decided to let bygones be bygones. She reconnected with Hahn, and the two octogenarians resumed their friendship. Although the Nobel committee never acknowledged its mistake, the slight to Meitner was partly mitigated in 1966 when the U.S. Department of Energy jointly awarded her, Hahn and Strassmann its prestigious Enrico Fermi Award “for pioneering research in the naturally occurring radioactivities and extensive experimental studies leading to the discovery of fission.” The two-decade late recognition came just in time for Meitner. She and Hahn died within months of each other in 1968; they were both 89 years old.

    See the full article here .

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  • richardmitnick 11:15 am on July 9, 2017 Permalink | Reply
    Tags: , , Lise Meitner, , UC Berkeley Nuclear Research Center,   

    Brought Forward by Larry Zamick, Rutgers Physics From UC Berkeley Nuclear Research Center: Women in STEM – Lise Meitner 

    UC Berkeley

    UC Berkeley Nuclear Research Center

    1
    Lise Meitner

    Lise Meitner [3] (7 November 1878 – 27 October 1968) was an Austrian, later Swedish, physicist who worked on radioactivity and nuclear physics. [4] Meitner was part of the team that discovered nuclear fission, an achievement for which her colleague Otto Hahn was awarded the Nobel Prize.[5] Meitner is often mentioned as one of the most glaring examples of women’s scientific achievement overlooked by the Nobel committee.[6][7][8] A 1997 Physics Today study concluded that Meitner’s omission was “a rare instance in which personal negative opinions apparently led to the exclusion of a deserving scientist” from the Nobel.[9] Element 109, Meitnerium, is named in her honour.[10][11][12].

    Meitner was born into a Jewish family as the third of eight children in Vienna, 2nd district (Leopoldstadt). Her father, Philipp Meitner,[13] was one of the first Jewish lawyers in Austria.[8] She was born on 7 November 1878. She shortened her name from Elise to Lise.[2][14] The birth register of Vienna’s Jewish community lists Meitner as being born on 17 November 1878, but all other documents list it as 7 November, which is what she used.[1] As an adult, she converted to Christianity, following Lutheranism,[1][15] and being baptized in 1908.[16]

    Scientific career

    Inspired by her teacher, physicist Ludwig Boltzmann, Meitner studied physics and became the second woman to obtain a doctoral degree in physics at the University of Vienna in 1905 (“Wärmeleitung im inhomogenen Körper”).[8] Women were not allowed to attend institutions of higher education in those days, but thanks to support from her parents, she was able to obtain private higher education, which she completed in 1901 with an “externe Matura” examination at the Akademisches Gymnasium. Following the doctoral degree, she rejected an offer to work in a gas lamp factory. Encouraged by her father and backed by his financial support, she went to Berlin. Max Planck allowed her to attend his lectures, an unusual gesture by Planck, who until then had rejected any women wanting to attend his lectures. After one year, Meitner became Planck’s assistant. During the first years she worked together with chemist Otto Hahn and discovered with him several new isotopes. In 1909 she presented two papers on beta-radiation.

    In 1912 the research group Hahn-Meitner moved to the newly founded Kaiser-Wilhelm-Institut (KWI) in Berlin-Dahlem, south west in Berlin. She worked without salary as a “guest” in Hahn’s department of Radiochemistry. It was not until 1913, at 35 years old and following an offer to go to Prague as associate professor, that she got a permanent position at KWI.

    In the first part of World War I, she served as a nurse handling X-ray equipment. She returned to Berlin and her research in 1916, but not without inner struggle. She felt in a way ashamed of wanting to continue her research efforts when thinking about the pain and suffering of the victims of war and their medical and emotional needs.[17]

    2
    Lise Meitner and Otto Hahn in their laboratory. Wikepedia

    In 1917, she and Hahn discovered the first long-lived isotope of the element protactinium, for which she was awarded the Leibniz Medal by the Berlin Academy of Sciences. That year, Meitner was given her own physics section at the Kaiser Wilhelm Institute for Chemistry.[8]

    In 1922, she discovered the cause, known as the Auger effect, of the emission from surfaces of electrons with ‘signature’ energies.[18] The effect is named for Pierre Victor Auger, a French scientist who independently discovered the effect in 1923.[19]

    In 1926, Meitner became the first woman in Germany to assume a post of full professor in physics, at the University of Berlin. There she undertook the research program in nuclear physics which eventually led to her co-discovery of nuclear fission in 1939, after she had left Berlin. She was praised by Albert Einstein as the “German Marie Curie”.[8][20][21]

    In 1930, Meitner taught a seminar on nuclear physics and chemistry with Leó Szilárd. With the discovery of the neutron in the early 1930s, speculation arose in the scientific community that it might be possible to create elements heavier than uranium (atomic number 92) in the laboratory. A scientific race began between Ernest Rutherford in Britain, Irène Joliot-Curie in France, Enrico Fermi in Italy, and the Meitner-Hahn team in Berlin. At the time, all concerned believed that this was abstract research for the probable honour of a Nobel prize. None suspected that this research would culminate in nuclear weapons.

    When Adolf Hitler came to power in 1933, Meitner was acting director of the Institute for Chemistry. Although she was protected by her Austrian citizenship, all other Jewish scientists, including her nephew Otto Frisch, Fritz Haber, Leó Szilárd and many other eminent figures, were dismissed or forced to resign from their posts. Most of them emigrated from Germany. Her response was to say nothing and bury herself in her work; she later acknowledged, in 1946, that “It was not only stupid but also very wrong that I did not leave at once.”[22]

    After the Anschluss, her situation became desperate. In July 1938, Meitner, with help from the Dutch physicists Dirk Coster and Adriaan Fokker, escaped to the Netherlands. She was forced to travel under cover to the Dutch border, where Coster persuaded German immigration officers that she had permission to travel to the Netherlands. She reached safety, though without her possessions. Meitner later said that she left Germany forever with 10 marks in her purse. Before she left, Otto Hahn had given her a diamond ring he had inherited from his mother: this was to be used to bribe the frontier guards if required. It was not required, and Meitner’s nephew’s wife later wore it.

    Meitner was lucky to escape, as Kurt Hess, a chemist who was an avid Nazi, had informed the authorities that she was about to flee. An appointment at the University of Groningen did not come through, and she went instead to Stockholm, where she took up a post at Manne Siegbahn’s laboratory, despite the difficulty caused by Siegbahn’s prejudice against women in science. Here she established a working relationship with Niels Bohr, who travelled regularly between Copenhagen and Stockholm. She continued to correspond with Hahn and other German scientists.[23]

    Nuclear fission

    Hahn and Meitner met privately in Copenhagen in November to plan a new round of experiments, and they subsequently exchanged a series of letters. Hahn and Fritz Strassmann then performed the difficult experiments which isolated the evidence for nuclear fission at his laboratory in Berlin. The surviving correspondence shows that Hahn recognized that fission was the only explanation for the barium, but, baffled by this remarkable conclusion, he wrote to Meitner. The possibility that uranium nuclei might break up under neutron bombardment had been suggested years before, notably by Ida Noddack in 1934. However, by employing the existing “liquid-drop” model of the nucleus,[24] Meitner and Frisch were the first to articulate a theory of how the nucleus of an atom could be split into smaller parts: uranium nuclei had split to form barium and krypton, accompanied by the ejection of several neutrons and a large amount of energy (the latter two products accounting for the loss in mass). She and Frisch had discovered the reason that no stable elements beyond uranium (in atomic number) existed naturally; the electrical repulsion of so many protons overcame the strong nuclear force.[24] Meitner also first realized that Einstein’s famous equation, E = mc2, explained the source of the tremendous releases of energy in nuclear fission, by the conversion of rest mass into kinetic energy, popularly described as the conversion of mass into energy.

    3
    Nuclear fission experimental setup, reconstructed at the Deutsches Museum, Munich. http://blog.nuclearsecrecy.com/tag/vannevar-bush/

    A letter from Bohr, commenting on the fact that the amount of energy released when he bombarded uranium atoms was far larger than had been predicted by calculations based on a non-fissile core, had sparked the above inspiration in December 1938. Hahn claimed that his chemistry had been solely responsible for the discovery, although he had been unable to explain the results.

    It was politically impossible for the exiled Meitner to publish jointly with Hahn in 1939. Hahn and Strassman had sent the manuscript of their paper to Naturwissenschaften in December 1938, reporting they had detected the element barium after bombarding uranium with neutrons;[25] simultaneously, they had communicated their results to Meitner in a letter. Meitner, and her nephew Otto Frisch, correctly interpreted their results as being nuclear fission and published their paper in Nature.[26] Frisch confirmed this experimentally on 13 January 1939.[27]

    Meitner recognized the possibility for a chain reaction of enormous explosive potential. This report had an electrifying effect on the scientific community. Because this could be used as a weapon, and since the knowledge was in German hands, Leó Szilárd, Edward Teller, and Eugene Wigner jumped into action, persuading Albert Einstein, a celebrity, to write President Franklin D. Roosevelt a letter of caution; this led eventually to the establishment several years later of the Manhattan Project. Meitner refused an offer to work on the project at Los Alamos, declaring “I will have nothing to do with a bomb!”[28] Meitner said that Hiroshima had come as a surprise to her, and that she was “sorry that the bomb had to be invented.”[29]

    In Sweden, Meitner was first active at Siegbahn’s Nobel Institute for Physics, and at the Swedish Defence Research Establishment (FOA) and the Royal Institute of Technology in Stockholm, where she had a laboratory and participated in research on R1, Sweden’s first nuclear reactor. In 1947, a personal position was created for Meitner at the University College of Stockholm with the salary of a professor and funding from the Council for Atomic Research.[30]

    Awards and honours

    5
    Meitner with actress Katherine Cornell and physicist Arthur Compton on 6 June 1946, when Meitner and Cornell were receiving awards from the National Conference of Christians and Jews. Wikimedia

    On 15 November 1945 the Royal Swedish Academy of Sciences announced that Hahn had been awarded the 1944 Nobel Prize in Chemistry for the discovery of nuclear fission.[31] Some historians who have documented the history of the discovery of nuclear fission believe Meitner should have been awarded the Nobel Prize with Hahn.[32][33][34]

    On a visit to the USA in 1946, she received the honour of “Woman of the Year” by the National Press Club and had dinner with President Harry Truman and others at the National Women’s Press Club. She lectured at Princeton, Harvard and other US universities, and was awarded a number of honorary doctorates. Lise Meitner refused to move back to Germany, and enjoyed retirement and research in Stockholm until her late 80s. She received the Max Planck Medal of the German Physics Society in 1949. Meitner was nominated to receive the prize three times. An even rarer honour was given to her in 1997 when element 109 was named meitnerium in her honour.[8][35][36] Named after Meitner were the Hahn-Meitner Institut in Berlin, craters on the Moon and on Venus, and a main-belt asteroid.

    Meitner was elected a foreign member of the Royal Swedish Academy of Sciences in 1945, and had her status changed to that of a Swedish member in 1951.

    In 1966 Hahn, Fritz Strassmann and Meitner were jointly awarded the Enrico Fermi Award.

    Lise Meitner received 21 scientific honours and awards for her work (including 5 honorary doctorates and membership of many academies). In 1947 she received the Award of the City of Vienna for science. She was the first female member of the scientific class of the Austrian Academy of Sciences. In 2008, the NBC defence school of the Austrian Armed Forces established the “Lise Meitner” award.

    In 1960, Meitner was awarded the Wilhelm Exner Medal and in 1967, the Austrian Decoration for Science and Art.

    Public facilities such as schools and streets were named after her in many cities.

    Later years

    After the war, Meitner, while acknowledging her own moral failing in staying in Germany from 1933 to 1938, was bitterly critical of Hahn and other German scientists who had collaborated with the Nazis and done nothing to protest against the crimes of Hitler’s regime. Referring to the leading German scientist Werner Heisenberg, she said: “Heisenberg and many millions with him should be forced to see these camps and the martyred people.”

    6
    Lise Meitner’s grave in Bramley. Wikipedia

    She wrote to Hahn:

    “You all worked for Nazi Germany. And you tried to offer only a passive resistance. Certainly, to buy off your conscience you helped here and there a persecuted person, but millions of innocent human beings were allowed to be murdered without any kind of protest being uttered … [it is said that] first you betrayed your friends, then your children in that you let them stake their lives on a criminal war – and finally that you betrayed Germany itself, because when the war was already quite hopeless, you did not once arm yourselves against the senseless destruction of Germany.”
    —[37]

    Hahn however wrote in his memoirs that he and Meitner had been lifelong friends.[38]

    Meitner became a Swedish citizen in 1949. She finally decided to retire in 1960 and then moved to the UK where most of her relatives were, although she continued working part-time and giving lectures. A strenuous trip to the United States in 1964 led to Meitner having a heart attack, from which she spent several months recovering. Her physical and mental condition weakened by atherosclerosis, she was unable to travel to the US to receive the Enrico Fermi prize and relatives had to present it to her. After breaking her hip in a fall and suffering several small strokes in 1967, Meitner made a partial recovery, but eventually was weakened to the point where she moved into a Cambridge nursing home. She died on 27 October 1968 at the age of 89. Meitner was not informed of the deaths of Otto Hahn and his wife Edith, as her family believed it would be too much for someone as frail as her to handle.[4] As was her wish, she was buried in the village of Bramley in Hampshire, at St. James parish church, close to her younger brother Walter, who had died in 1964. Her nephew Otto Frisch composed the inscription on her headstone. It reads “Lise Meitner: a physicist who never lost her humanity.”

    References
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    Nuclear energy offers the potential for creating reliable, carbon-free, domestically produced base electricity to meet rising energy demands. A dramatic expansion of nuclear power is already underway internationally, and U.S. domestic expansion of nuclear power is on the verge of becoming a reality. However, longer-term challenges remain in the areas of waste disposition, proliferation of nuclear technologies and materials, fuel resource management and fuel cycle economics. Left unaddressed, these challenges will prevent realization of the full potential of nuclear energy. The degree to which nuclear energy can sustainably meet long-term energy needs will depend on the development of advanced methods and technologies, together with implementation of sound domestic and international policies.

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