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J. J. Sakurai

J. J. Sakurai is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand J. J. Sakurai rather than just read about it. In short: Jun John Sakurai (桜井 純, Sakurai Jun; January 31, 1933 – November 1, 1982) was a Japanese–American theoretical particle physicist. While a graduate student at Cornell University, Sakurai independently discovered the V-A theory of weak interactions.

J. J. Sakurai — main illustration
J. J. Sakurai — illustration

Key takeaways

  • J. J. Sakurai belongs to physics; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect J. J. Sakurai to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of J. J. Sakurai from memory before moving on to harder problems.

Reference excerpt

Jun John Sakurai (桜井 純, Sakurai Jun; January 31, 1933 – November 1, 1982) was a Japanese–American theoretical particle physicist. While a graduate student at Cornell University, Sakurai independently discovered the V-A theory of weak interactions. He authored the popular graduate text Modern Quantum Mechanics (1985, published posthumously) and other texts such as Invariance Principles and Elementary Particles (1964) and Advanced Quantum Mechanics (1967).

Life and career J. J. Sakurai was born in Tokyo in 1933 and moved to the United States when he was a high school student. He studied physics at Harvard and Cornell, where he proposed his theory of weak interactions. After receiving his PhD from Cornell in 1958 he joined the faculty at University of Chicago, becoming a full professor in 1964. In 1970, Sakurai moved to the University of California, Los Angeles. As a graduate student, he proposed the V−A theory of weak interactions, independently of Robert Marshak, George Sudarshan, Richard Feynman, and Murray Gell-Mann. In 1960, he published a paper on the theory of strong interactions based on Abelian and non-Abelian (Yang-Mills) gauge invariance. In that paper, he also pioneered the vector meson dominance model of hadron dynamics. Sakurai died from an aneurysm in 1982 during a visit to CERN.

Textbooks In addition to his published papers, Sakurai authored several textbooks. These include Invariance Principles and Elementary Particles (1964), Advanced Quantum Mechanics (1967), and Modern Quantum Mechanics. The third volume was left unfinished due to Sakurai's sudden death in 1982, but was later edited and completed with the help of his wife, Noriko Sakurai, and colleague San Fu Tuan. Modern Quantum Mechanics is probably his most well known book and is still widely used for graduate studies today.

Sakurai Prize In 1984 the family and friends of J. J. Sakurai endowed a prize for theoretical physicists in his honor. The goal of the prize as stated on the APS website is to encourage outstanding work in the field of particle theory. Recipients receive a $10,000 grant, an allowance for travel to the ceremony, and a certificate citing their contributions to particle physics.

See also

Sakurai Prize

References

Further reading Sakurai, J. J, and Jim Napolitano. Modern Quantum Mechanics. 2nd ed., Cambridge University Press, 2017. ISBN 978-1108422413. Townsend, John S. A Modern Approach to Quantum Mechanics. 2nd ed., University Science Books, 2012. ISBN 978-1891389788.

External links

University of California: In Memoriam, 1985 Scientific publications of J. J. Sakurai on INSPIRE-HEP

Illustrations

J. J. Sakurai illustration

Worked examples

Example 1 — a first encounter with J. J. Sakurai

Start with the simplest possible case. Write down what J. J. Sakurai claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to J. J. Sakurai before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about J. J. Sakurai ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of J. J. Sakurai

In research
J. J. Sakurai appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses J. J. Sakurai in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
J. J. Sakurai is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1933 births, 1982 deaths, 20th-century American physicists, so understanding it makes those chapters shorter.
In everyday life
Look for J. J. Sakurai outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study J. J. Sakurai in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what J. J. Sakurai means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain J. J. Sakurai out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is J. J. Sakurai in simple terms?

Jun John Sakurai (桜井 純, Sakurai Jun; January 31, 1933 – November 1, 1982) was a Japanese–American theoretical particle physicist. While a graduate student at Cornell University, Sakurai independently discovered the V-A theory of weak interactions.

Why does J. J. Sakurai matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study J. J. Sakurai?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on J. J. Sakurai.

Tags

  • 1933 births
  • 1982 deaths
  • 20th-century American physicists
  • American academics of Japanese descent
  • American particle physicists
  • American scientists of Asian descent
  • Cornell University alumni
  • Harvard University alumni
  • Japanese emigrants to the United States
  • Japanese particle physicists
  • People associated with CERN
  • Scientists from New York (state)

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