The Donald A. Glaser Papers, 1943-2013, Bulk 1949-2003
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8.701 Introduction to Nuclear and Particle Physics, Recitation 19
Massachusetts Institute of Technology Department of Physics Course: 8.701 { Introduction to Nuclear and Particle Physics Term: Fall 2020 Instructor: Markus Klute TA : Tianyu Justin Yang Discussion Problems from recitation on December 1st, 2020 Problem 1: Bubble Chamber Carl David Anderson discovered positrons in cosmic rays. The picture below shows a cloud chamber image produced by Anderson in 1931. The cloud chamber is positioned in a magnetic field of 1:5 T with field lines pointing into the plane of the paper. A cosmic ray particle enters the chamber from below and leaves a circular track. There is a 6 mm thick lead plate in the cloud chamber visible as a horizontal line. The radius of curvature is 15:5 cm before and 5:3 cm after the passage through the lead plate. 1 Figure 1: Cloud-chamber image of a positron. This image is in the public domain. a) Estimate the momentum of the particle before and after the passage through the lead plate. What is the charge of the particle? b) Compare the energy loss during the passage through the lead plate for a proton, a pions, and an electron. For the energy loss calculation, you can use the approximate Bethe formula below and assume constant energy loss. dE Z 1 m γ2 β2 c2 = −4 π N r2 m c2 z 2 ·· ln e (1) A e e 2 dX Ion A β I Explain why this is sufficient to exclude the proton and pion hypothesis. The con- 23 −1 −12 A s stants in the equation are NA = 6; 022 × 10 mol , 0 = 8; 85 × 10 V m , me = e2 511 keV, re = 2 , Z = 82, A = 207, and I = 820 eV, the ionisation energy in (4 π0)me c lead. -
Cloud Chamber Experiment
Cloud chamber experiment Teachers notes Adapted from “Science, Society and America’s Nuclear Waste – Ionising Radiation” by US Department of Energy, July 1995. Page 1 of 8 Adapted from “Science, Society and America’s Nuclear Waste – Ionising Radiation” by US Department of Energy, July 1995. Page 1 of 8 Purpose: The Cloud Chamber experiment illustrates that though radiation cannot be detected with the senses, it is possible to observe the result of radioactive decay. Concepts: 1. Radiation cannot be detected directly by using our senses, but can be indirectly detected. Duration of Lesson: One 50-minute class period. Objectives: As a result of the participation in the Cloud Chamber experience, the student will be able to: 1. Describe that as charged particles pass through the chamber, they leave an observable track much like the vapour train of a jet plane; and 2. Conclude that what he/she has observed is the result of radioactive decay. Optional Objectives: 1. Through measurement of tracks in the Cloud Chamber, the student will be able to determine which type of radiation travels furthest from its source. 2. By holding a strong magnet next to the Cloud Chamber, the student will be able to deduce what effect, if any, a magnet has on radiation. 3. By wrapping the source alternatively in paper, aluminium foil, plastic wrap and cloth, the student will be able to conclude what effect, if any, shielding has on radiation. Skills: Drawing conclusions, measuring, note-taking, observing, deductive reasoning, working in groups. Vocabulary: Alpha particle, beta particle, gamma ray. Materials: Activity Sheets The Cloud Chamber Background Notes Safe Use of Dry Ice Cloud Chamber Suggested Procedure: Adapted from “Science, Society and America’s Nuclear Waste – Ionising Radiation” by US Department of Energy, July 1995. -
Date: To: September 22, 1 997 Mr Ian Johnston©
22-SEP-1997 16:36 NOBELSTIFTELSEN 4& 8 6603847 SID 01 NOBELSTIFTELSEN The Nobel Foundation TELEFAX Date: September 22, 1 997 To: Mr Ian Johnston© Company: Executive Office of the Secretary-General Fax no: 0091-2129633511 From: The Nobel Foundation Total number of pages: olO MESSAGE DearMrJohnstone, With reference to your fax and to our telephone conversation, I am enclosing the address list of all Nobel Prize laureates. Yours sincerely, Ingr BergstrSm Mailing address: Bos StU S-102 45 Stockholm. Sweden Strat itddrtSMi Suircfatan 14 Teleptelrtts: (-MB S) 663 » 20 Fsuc (*-«>!) «W Jg 47 22-SEP-1997 16:36 NOBELSTIFTELSEN 46 B S603847 SID 02 22-SEP-1997 16:35 NOBELSTIFTELSEN 46 8 6603847 SID 03 Professor Willis E, Lamb Jr Prof. Aleksandre M. Prokhorov Dr. Leo EsaJki 848 North Norris Avenue Russian Academy of Sciences University of Tsukuba TUCSON, AZ 857 19 Leninskii Prospect 14 Tsukuba USA MSOCOWV71 Ibaraki Ru s s I a 305 Japan 59* c>io Dr. Tsung Dao Lee Professor Hans A. Bethe Professor Antony Hewlsh Department of Physics Cornell University Cavendish Laboratory Columbia University ITHACA, NY 14853 University of Cambridge 538 West I20th Street USA CAMBRIDGE CB3 OHE NEW YORK, NY 10027 England USA S96 014 S ' Dr. Chen Ning Yang Professor Murray Gell-Mann ^ Professor Aage Bohr The Institute for Department of Physics Niels Bohr Institutet Theoretical Physics California Institute of Technology Blegdamsvej 17 State University of New York PASADENA, CA91125 DK-2100 KOPENHAMN 0 STONY BROOK, NY 11794 USA D anni ark USA 595 600 613 Professor Owen Chamberlain Professor Louis Neel ' Professor Ben Mottelson 6068 Margarldo Drive Membre de rinstitute Nordita OAKLAND, CA 946 IS 15 Rue Marcel-Allegot Blegdamsvej 17 USA F-92190 MEUDON-BELLEVUE DK-2100 KOPENHAMN 0 Frankrike D an m ar k 599 615 Professor Donald A. -
Particle Detectors Lecture Notes
Lecture Notes Heidelberg, Summer Term 2011 The Physics of Particle Detectors Hans-Christian Schultz-Coulon Kirchhoff-Institut für Physik Introduction Historical Developments Historical Development γ-rays First 1896 Detection of α-, β- and γ-rays 1896 β-rays Image of Becquerel's photographic plate which has been An x-ray picture taken by Wilhelm Röntgen of Albert von fogged by exposure to radiation from a uranium salt. Kölliker's hand at a public lecture on 23 January 1896. Historical Development Rutherford's scattering experiment Microscope + Scintillating ZnS screen Schematic view of Rutherford experiment 1911 Rutherford's original experimental setup Historical Development Detection of cosmic rays [Hess 1912; Nobel prize 1936] ! "# Electrometer Cylinder from Wulf [2 cm diameter] Mirror Strings Microscope Natrium ! !""#$%&'()*+,-)./0)1&$23456/)78096$/'9::9098)1912 $%&!'()*+,-.%!/0&1.)%21331&10!,0%))0!%42%!56784210462!1(,!9624,10462,:177%&!(2;! '()*+,-.%2!<=%4*1;%2%)%:0&67%0%&!;1&>!Victor F. Hess before his 1912 balloon flight in Austria during which he discovered cosmic rays. ?40! @4)*%! ;%&! /0%)),-.&1(8%! A! )1,,%2! ,4-.!;4%!BC;%2!;%,!D)%:0&67%0%&,!(7!;4%! EC2F,1-.,%!;%,!/0&1.)%21331&10,!;&%.%2G!(7!%42%!*H&!;4%!A8)%,(2F!FH2,04F%!I6,40462! %42,0%))%2! J(! :K22%2>! L10&4(7! =4&;! M%&=%2;%0G! (7! ;4%! E(*0! 47! 922%&%2! ;%,! 9624,10462,M6)(7%2!M62!B%(-.04F:%40!*&%4!J(!.1)0%2>! $%&!422%&%G!:)%42%&%!<N)42;%&!;4%20!;%&!O8%&3&H*(2F!;%&!9,6)10462!;%,!P%&C0%,>!'4&;!%&! H8%&! ;4%! BC;%2! F%,%2:0G! ,6! M%&&42F%&0! ,4-.!;1,!1:04M%!9624,10462,M6)(7%2!1(*!;%2! -
Types of Radiation: the Patterns They Produce in a Cloud Chamber
430 THEAMERICAN BIOLOGY TEACHER the National Bureau of Standards available from No. 51, Radiological Monitoring Methods and the Superintendent of Documents, Government Instruments, $.20. Printing Office, Washington 25, D. C., at the prices No. 69, Maximum Permissible Body Burdens and indicated. Maximum Permissible concentrations of No. 42, Safe Handling of Radioactive Isotopes, Radionucleides in Air and in Water for $.20 Occupational Exposure, $.35. No. 48, Control and Removal of Radioactive No. 80, A Manual of Radioactivity Procedures, Contamination in Laboratories, $.15. $.50. Types of Radiation-the PatternsThey Produce in a CloudChamber Downloaded from http://online.ucpress.edu/abt/article-pdf/27/6/430/21573/4441004.pdf by guest on 28 September 2021 * C. T. Lange, ClaytonHigh School, Clayton,Missouri, and Glen Farrell,Holt, Rinehartand Winston,San Francisco,California A description of the practical uses of a cloud chamber is followed by the instructions for the building and use of an inexpensive cloud chamber in the classroom. Introduction a biologist, yet we can use it to help build a Every minute of the day, whether we basic understanding of the nature and prop- realize it or not, we are being pelted by an erties of ionizing radiations. The cloud invisible stream of very high energy particles chamber was the tool which Rutherford used known as cosmic rays. The number of these to study transmutation of one element to striking our body is about one thousand per another. He observed that nitrogen atoms minute. We also are being subjected to the under alpha particle bombardment were alpha, beta, and gamma radiations from changed into oxygen and hydrogen. -
Track Cosmic Rays in a Cloud Chamber 1 Track Cosmic Rays in a Cloud Chamber
Track Cosmic Rays in a Cloud Chamber 1 Track Cosmic Rays in a Cloud Chamber A cloud chamber is a tool that reveals the path of cosmic rays or other energetic charged particles. Because it permits us to measure the track of these particles in three dimensions, even when they are deflected by magnetic fields, the cloud chamber was important in research during the 1930's that started our exploration of the nature of cosmic rays and fundamental particles. For example, in 1932 Carl Anderson discovered the positron in photographs of cosmic rays through cloud chambers. The positron is the antiparticle for an electron, and it is equally well described as an electron traveling backward in time! Anderson won the Nobel Prize for this in 1936, and a year later he discovered the muon, the electron's heavy cousin. Showers of cosmic rays produced in the cascade from the primary's interaction with the atmosphere contain electrons, positrons, and muons. How They Work The early cloud chambers were pulsed. Water or some other condensible gas in a closed chamber was suddenly cooled by expanding it rapidly. This produced a supersaturated vapor, but when charged particles passed through it, a cloud would form along the particle track if the conditions were just right. By 1950 a diffusion cloud chamber was developed which operated continuously. It is simple to make and operate, and for several years it was used to investigate fundamental particles and cosmic rays. Our diffusion cloud chamber is a replica of this design. It is a an insulated metal box about 15 inches on a side. -
JUAN MANUEL 2016 NOBEL PEACE PRIZE RECIPIENT Culture Friendship Justice
Friendship Volume 135, № 1 Character Culture JUAN MANUEL SANTOS 2016 NOBEL PEACE PRIZE RECIPIENT Justice LETTER FROM THE PRESIDENT Dear Brothers, It is an honor and a privilege as your president to have the challenges us and, perhaps, makes us question our own opportunity to share my message with you in each edition strongly held beliefs. But it also serves to open our minds of the Quarterly. I generally try to align my comments and our hearts to our fellow neighbor. It has to start with specific items highlighted in each publication. This with a desire to listen, to understand, and to be tolerant time, however, I want to return to the theme “living our of different points of view and a desire to be reasonable, Principles,” which I touched upon in a previous article. As patient and respectful.” you may recall, I attempted to outline and describe how Kelly concludes that it is the diversity of Southwest’s utilization of the Four Founding Principles could help people and “treating others like you would want to be undergraduates make good decisions and build better treated” that has made the organization successful. In a men. It occurred to me that the application of our values similar way, Stephen Covey’s widely read “Seven Habits of to undergraduates only is too limiting. These Principles are Highly Effective People” takes a “values-based” approach to indeed critical for each of us at this particularly turbulent organizational success. time in our society. For DU to be a successful organization, we too, must As I was flying back recently from the Delta Upsilon be able to work effectively with our varied constituents: International Fraternity Board of Directors meeting in undergraduates, parents, alumni, higher education Arizona, I glanced through the February 2017 edition professionals, etc. -
Muonium Gravity Seminar Wichita-6-17
Antimatter Gravity MICE-U.S. Plans withDaniel Muons M. Kaplan US Spokesperson, MICE Collaboration Daniel M. Kaplan Physics Seminar WichitaMuTAC State Review Univ. June Fermilab16, 2017 16–17 March, 2006 Outline • Dramatis Personae • A Bit of History - antimatter, the baryon asymmetry of the universe, and all that... • The Ideas, The Issues, The Opportunities • Required R&D • Conclusions Our story’s a bit complicated, so please bear with me! ...and stop me if you have a question! D. M. Kaplan, IIT An#ma&er Gravity Seminar 2/41 Matter & Energy • After many decades of experimentation with subatomic particles, we now know whatDramatis everything is made of... Personae Baryons & antibaryons : p== uud & p uud ΛΛ==uds & uds ... Mesons : K00== ds & K ds B00== db & B db B+ == ub & B− ub ... ∓ ∓ ∓ Leptons : e , µ , τ , ν’s D. M. Kaplan, IIT An#ma&er Gravity Seminar 3/41 Matter & Energy • After many decades of experimentation with subatomic particles, we now know whatDramatis everything is made of... Personae “Imperfect mirror” Baryons & antibaryons : Antip== uud & p uud ΛΛ==uds & uds ... Mesons : Anti K00== ds & K ds B00== db & B db Anti B+ == ub & B− ub ... Antimatter Leptons : e∓, µ∓, τ∓, ν’s • And, don’t forget: antimatter and matter annihilate on contact D. M. Kaplan, IIT An#ma&er Gravity Seminar 3/41 Outline • Dramatis Personae ➡ • A Bit of History - antimatter, the baryon asymmetry of the universe, and all that... • The Ideas, The Issues, The Opportunities • Muonium Gravity Experiment • Required R&D • Conclusions D. M. Kaplan, IIT An#ma&er Gravity Seminar 4/41 Our story begins with.. -
Cloud Chambers Nuclear Chemistry SCIENTIFIC
Cloud Chambers Nuclear Chemistry SCIENTIFIC Introduction Condensation trails in a cloud chamber provide evidence of the passage of charged radioactive particles. Concepts • Radioactivity • Radioactive decay Materials Cloud chamber Beral-type pipet or medicine dropper Blotting paper viewer Strong light source (projector or flashlight) Radioactive source (lantern mantle) Dry ice, flat, 6 × 6 Ethyl alcohol, denatured Safety Precautions This activity requires the use of hazardous components and/or has the potential for hazardous reactions. The radiation level produced by the radioactive source is very low (less than 0.1 µCi). Therefore, no special safety precautions need to be taken. However, it is still recommended that you wash your hands after handling the mantles and avoid inhaling mantle dust. Dry ice should be handled only with insulated gloves. Ethyl alcohol is toxic by ingestion and poses a fire hazard. Wear chemical splash goggles while performing the demonstration. Please review current Safety Data Sheets for additional safety, handling, and disposal information. Procedure 1. Using the Beral-type pipet or medicine dropper, soak the blotting paper inside the chamber with the ethyl alcohol. Add enough ethyl alcohol so that there is a thin layer on the bottom of the chamber. 2. Place the lid on the chamber. 3. Place the cloud chamber on a flat piece of dry ice. 4. Partially insert the radioactive source (the The Cloud Chamber lantern mantle) into the hole in the side Cloud Chamber Window of the cloud chamber. This can be done Light by pushing the white side of the lantern Chamber Lid mantle through the hole with your hands. -
Modern Physics, the Nature of the Interaction Between Particles Is Carried a Step Further
44.1 Some Properties of Nuclei 1385 are the same, apart from the additional repulsive Coulomb force for the proton– U(r ) (MeV) proton interaction. 40 Evidence for the limited range of nuclear forces comes from scattering experi- n–p system ments and from studies of nuclear binding energies. The short range of the nuclear 20 force is shown in the neutron–proton (n–p) potential energy plot of Figure 44.3a 0 r (fm) obtained by scattering neutrons from a target containing hydrogen. The depth of 1 567432 8 the n–p potential energy well is 40 to 50 MeV, and there is a strong repulsive com- Ϫ20 ponent that prevents the nucleons from approaching much closer than 0.4 fm. Ϫ40 The nuclear force does not affect electrons, enabling energetic electrons to serve as point-like probes of nuclei. The charge independence of the nuclear force also Ϫ60 means that the main difference between the n–p and p–p interactions is that the a p–p potential energy consists of a superposition of nuclear and Coulomb interactions as shown in Figure 44.3b. At distances less than 2 fm, both p–p and n–p potential The difference in the two curves energies are nearly identical, but for distances of 2 fm or greater, the p–p potential is due to the large Coulomb has a positive energy barrier with a maximum at 4 fm. repulsion in the case of the proton–proton interaction. The existence of the nuclear force results in approximately 270 stable nuclei; hundreds of other nuclei have been observed, but they are unstable. -
The Federal Government: a Nobel Profession
The Federal Government: A Nobel Profession A Report on Pathbreaking Nobel Laureates in Government 1901 - 2002 INTRODUCTION The Nobel Prize is synonymous with greatness. A list of Nobel Prize winners offers a quick register of the world’s best and brightest, whose accomplishments in literature, economics, medicine, science and peace have enriched the lives of millions. Over the past century, 270 Americans have received the Nobel Prize for innovation and ingenuity. Approximately one-fourth of these distinguished individuals are, or were, federal employees. Their Nobel contributions have resulted in the eradication of polio, the mapping of the human genome, the harnessing of atomic energy, the achievement of peace between nations, and advances in medicine that not only prolong our lives, but “This report should serve improve their quality. as an inspiration and a During Public Employees Recognition Week (May 4-10, 2003), in an effort to recognize and honor the reminder to us all of the ideas and accomplishments of federal workers past and present, the Partnership for Public Service offers innovation and nobility of this report highlighting 50 American Nobel laureates the work civil servants do whose award-winning achievements occurred while they served in government or whose public service every day and its far- work had an impact on their career achievements. They were honored for their contributions in the fields reaching impact.” of Physiology or Medicine, Economic Sciences, and Physics and Chemistry. Also included are five Americans whose work merited the Peace Prize. Despite this legacy of accomplishment, too few Americans see the federal government as an incubator for innovation and discovery. -
From the Executive Director Kathryn Sullivan to Receive Sigma Xi's Mcgovern Award
May-June 2011 · Volume 20, Number 3 Kathryn Sullivan to From the Executive Director Receive Sigma Xi’s McGovern Award Annual Report In my report last year I challenged the membership to consider ormer astronaut the characteristics of successful associations. I suggested that we Kathryn D. emulate what successful associations do that others do not. This FSullivan, the first year as I reflect back on the previous fiscal year, I suggest that we need to go even further. U.S. woman to walk We have intangible assets that could, if converted to tangible outcomes, add to the in space, will receive value of active membership in Sigma Xi. I believe that standing up for high ethical Sigma Xi’s 2011 John standards, encouraging the earlier career scientist and networking with colleagues of diverse disciplines is still very relevant to our professional lives. Membership in Sigma P. McGovern Science Xi still represents recognition for scientific achievements, but the value comes from and Society Award. sharing with companions in zealous research. Since 1984, a highlight of Sigma Xi’s Stronger retention of members through better local programs would benefit the annual meeting has been the McGovern Society in many ways. It appears that we have continued to initiate new members in Lecture, which is made by the recipient of numbers similar to past years but retention has declined significantly. In addition, the the McGovern Medal. Recent recipients source of the new members is moving more and more to the “At-large” category and less and less through the Research/Doctoral chapters. have included oceanographer Sylvia Earle and Nobel laureates Norman Borlaug, Mario While Sigma Xi calls itself a “chapter-based” Society, we have found that only about half of our “active” members are affiliated with chapters in “good standing.” As long Molina and Roald Hoffmann.