From Quarks to the Bomb
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1 Research Introductions - November 10, 2010 p. From Quarks to the Bomb Basic Science Science Policy Jerry Gilfoyle, University of Richmond
2 Research Introductions - November 10, 2010 p. From Quarks to the Bomb Basic Science Science Policy Jerry Gilfoyle, University of Richmond Outline: 1. Hunting for Quarks: Motivation and Method 2. Nuclear Non-proliferation: Science Meets Politics 3. Science and Policy Careers
3 Research Introductions - November 10, 2010 p. Hunting for Quarks - What Do We Know? From the Edge of the Universe to m 10 7 m the Earth to... hominids to m m the Atom to... the nucleus to... Protons and are made of quarks m neutrons...
4 The Periodic Chart Research Introductions - November 10, 2010 p.
5 Research Introductions - November 10, 2010 p. What Do We Know? The Universe is made of quarks and leptons and the force carriers. The atomic nucleus is made of protons (uud) and neutrons (udd) bound by the strong force. The quarks are confined inside the protons and neutrons. Protons and neutrons are NOT confined.
6 Research Introductions - November 10, 2010 p. What Do We Know? The Universe is made of quarks and leptons and the force carriers. The atomic nucleus is made of protons (uud) and neutrons (udd) bound by the strong force. The quarks are confined inside the protons and neutrons. Protons and neutrons are NOT confined.
7 Research Introductions - November 10, 2010 p. What is the Force? Quantum chromodynamics (QCD) gets the force among quarks and gluons right at high energy (Nobel Prize in 2004). 3 tons The hadronic model uses protons and neutrons (nucleons) to describe data at low energy. This strong force is the residual force between quarks. Potential Energy n-p Separation
8 Research Introductions - November 10, 2010 p. How Well Do We Know It? QCD works real goood! (B.Abbott, et al., Phys. Rev. Lett., 86, 1707 (2001)). pp jets transverse energy effective target area So does the hadronic model (L.C.Alexa, et al., Phys. Rev. Lett., 82, 1374 (1999)). ed e d 4-momentum transfer squared
9 Research Introductions - November 10, 2010 p. What Don t We Know? Matter comes in pairs of quarks or triplets. We are made mostly of the triplets (protons and neutrons). More than 99% of our mass is in nucleons. The proton is 2 ups + 1 down; the neutron is 1 up + 2 downs. How much does the proton weigh?
10 Research Introductions - November 10, 2010 p. What Don t We Know? Matter comes in pairs of quarks or triplets. We are made mostly of the triplets (protons and neutrons). More than 99% of our mass is in nucleons. The proton is 2 ups + 1 down; the neutron is 1 up + 2 downs. How much does the proton weigh? m p = 2m up + m down = 2(0.002 GeV/c 2 ) GeV/c 2
11 Research Introductions - November 10, 2010 p. What Don t We Know? Matter comes in pairs of quarks or triplets. We are made mostly of the triplets (protons and neutrons). More than 99% of our mass is in nucleons. The proton is 2 ups + 1 down; the neutron is 1 up + 2 downs. How much does the proton weigh? m p = 2m up + m down = 2(0.002 GeV/c 2 ) GeV/c 2 = GeV/c 2 OOOPS!!!????
12 Research Introductions - November 10, 2010 p. What s Up? Or Down? The strong force produces an intense field that stores a huge amount of energy. Remember the 3 tons. That intense, high-energy field has mass! E = mc 2 We know the missing mass is in there, but don t yet have a working theory. Maybe soon (after the 12 GeV Upgrade at Jefferson Lab)! n /µ M n G D G Blue - CLAS6 Green - Previous World Data Black - CLAS12 anticipated Anticipated Statistical uncertainties only Miller Guidal et al. Cloet et al :19:52 Q (GeV ) 2 2
13 Research Introductions - November 10, 2010 p. How Do We See Inside a Nucleus? High-energy electrons can throw a diffraction pattern when they shine on atomic nuclei. Jefferson Lab Need a big accelerator! And a big detector! And lots of help. CLAS
14 Research Introductions - November 10, 2010 p. How Do We See Inside a Nucleus? High-energy electrons can throw a diffraction pattern when they shine on atomic nuclei. Jefferson Lab Need a big accelerator! And a big detector! And lots of help. CLAS
15 Research Introductions - November 10, 2010 p. How Do We See Inside a Nucleus? High-energy electrons can throw a diffraction pattern when they shine on atomic nuclei. Jefferson Lab Need a big accelerator! And a big detector! And lots of help. CLAS
16 Research Introductions - November 10, 2010 p. How Do We See Inside a Nucleus? High-energy electrons can throw a diffraction pattern when they shine on atomic nuclei. Jefferson Lab Need a big accelerator! And a big detector! And lots of help. CLAS
17 Research Introductions - November 10, 2010 p. How Do We See Inside a Nucleus? High-energy electrons can throw a diffraction pattern when they shine on atomic nuclei. Jefferson Lab Need a big accelerator! And a big detector! And lots of help. CLAS
18 A CLAS Event Electromagnetic Calorimeters Cerenkov Counters Drift Chambers Scintillators Drift chambers - Charged particle trajectories. Scintillators - Light produced by particles. Cerenkovs - Separate electrons from pions. Calorimeters - Energy. Research Introductions - November 10, 2010 p. 1
19 A CLAS Event Electromagnetic Calorimeters Cerenkov Counters The work at JLab has sparked a REVOLUTION in our understanding of matter! Drift Chambers Scintillators Drift chambers - Charged particle trajectories. Scintillators - Light produced by particles. Cerenkovs - Separate electrons from pions. Calorimeters - Energy. Research Introductions - November 10, 2010 p. 1
20 Research Introductions - November 10, 2010 p. 1 Basic Science - Why should YOU pay for it? 1. Over the last 100 years, at least 50% of the growth in our standard of living is due to technological change. 2. Technological spinoffs: NMR MRI, WWW, transistors, computers, Production of trained scientists, engineers, technicians.... all from basic physics research.
21 Research Introductions - November 10, 2010 p. 1 Basic Science - Why should YOU pay for it? 1. Over the last 100 years, at least 50% of the growth in our standard of living is due to technological change. 2. Technological spinoffs: NMR MRI, WWW, transistors, computers, Production of trained scientists, engineers, technicians.... all from basic physics research. In Paris in 1783 Benjamin Franklin watched with amazement one of the first hot-air balloon flights. The following exchange was said to occur. Questioner to Franklin: Sir, what s the use of flying in the air? Ben Franklin s answer: Sir, what s the use of a newborn baby?
22 Research Introductions - November 10, 2010 p. 1 Putting the Genie Back in the Bottle: The Science of Nuclear Non-Proliferation Jerry Gilfoyle Physics Department, University of Richmond, Virginia Outline: 1. Nuclear Weapons The Comprehensive Test Ban Treaty. 3. Testing The Test Ban Treaty. 4. Why should you care? and Conclusions.
23 Research Introductions - November 10, 2010 p. 1 Nuclear Weapons Fission and Fusion Fissile materials ( 235 U, 239 Pu) release enormous energies. As each nucleus splits, it emits 2 or so neutrons plus lots of energy 180 MeV). If density is high, a chain reaction will cause other fissions in a self-propagating process. A Chain Reaction 235 U nuclei neutrons As a fission bomb explodes deuterium and tritium can fuse releasing neutrons and even more energy; 2 H + 3 H 4 He + n MeV. Only about 8 kg of plutonium or 25 kg of highly-enriched uranium (HEU) is needed is needed to produce a weapon.
24 Research Introductions - November 10, 2010 p. 1 Nuclear Weapons Basic Weapons Designs A uranium, gun-type nuclear weapon - High explosive pushes highly-enriched uranium at high speed down the gun tube and into the other piece of active material. The density increases enough to sustain the chain reaction. A two-stage, thermonuclear weapon. - High explosive crushes the plutonium primary to a density where fission can occur. The uranium and plutonium in the secondary burn and increase the temperature until fusion starts. The energy released by the fusion reaction raises the temperature even higher and burns more of the fission fuel. Propellant Plutonium Tamper High Explosive Primary Gun Tube Active Material Tamper Uranium Tamper Plutonium Secondary Fusion Fuel Nuclear fireball 1 ms after detonation (Tumbler Snapper). The fireball is about 20 m across.
25 Research Introductions - November 10, 2010 p. 1 Nuclear Weapons Effects Energy released in the form of light, heat and blast. Blast 40-50% of total energy. Thermal radiation 30-50% of total energy. Ionizing radiation 5% of total energy. Residual radiation 5-10% of total energy. Figure shows effect of 15 kiloton bomb (about the size of the Hiroshima bomb) exploded over the Gottwald Science Center.
26 Research Introductions - November 10, 2010 p. 1 Nuclear Weapons Effects Energy released in the form of light, heat and blast. Blast 40-50% of total energy. Thermal radiation 30-50% of total energy. Ionizing radiation 5% of total energy. Residual radiation 5-10% of total energy. Figure shows effect of 15 kiloton bomb (about the size of the Hiroshima bomb) exploded over the Gottwald Science Center.
27 Research Introductions - November 10, 2010 p. 1 The Comprehensive Test Ban Treaty (CTBT) The CTBT bans all nuclear explosions to limit the proliferation of nuclear weapons. A network of seismological, hydroacoustic, infrasound, and radionuclide sensors will monitor compliance (International Monitoring System or IMS). On-site inspection will be provided to check compliance. The US has signed the CTBT, but not ratified it. 337 monitoring stations planned, 70% in place now.
28 Research Introductions - November 10, 2010 p. 1 Testing the Test Ban Treaty On October 9, 2006 the Democratic People s Republic of Korea detonated a nuclear bomb underground in the vicinity of P unggye in the northeast part of North Korea.
29 Research Introductions - November 10, 2010 p. 1 Testing the Test Ban Treaty On October 9, 2006 the Democratic People s Republic of Korea detonated a nuclear bomb underground in the vicinity of P unggye in the northeast part of North Korea. The seismic signature of the blast was detected by more than 20 IMS seismic monitoring stations. The yield was less than a kiloton (a fizzle?).
30 Research Introductions - November 10, 2010 p. 1 Testing the Test Ban Treaty On October 9, 2006 the Democratic People s Republic of Korea detonated a nuclear bomb underground in the vicinity of P unggye in the northeast part of North Korea. The seismic signature of the blast was detected by more than 20 IMS seismic monitoring stations. The yield was less than a kiloton (a fizzle?). Radioactive xenon nuclei were detected at an IMS station in Yellowknife, NWT, Canada, two weeks after the blast and attributed to the test. Yellowknife P unggye
31 Research Introductions - November 10, 2010 p. 1 Testing the Test Ban Treaty On October 9, 2006 the Democratic People s Republic of Korea detonated a nuclear bomb underground in the vicinity of P unggye in the northeast part of North Korea. The seismic signature of the blast was detected by more than 20 IMS seismic monitoring stations. The yield was less than a kiloton (a fizzle?). Radioactive xenon nuclei were detected at an IMS station in Yellowknife, NWT, Canada, two weeks after the blast and attributed to the test. Yellowknife P unggye How??
32 Research Introductions - November 10, 2010 p. 1 Detecting Radioxenons from Nuclear Tests Radioactive isotopes of xenon are produced in the explosion and none exist in nature. One form 133 Xe decays in about 5 days emitting a β (an electron) and a γ (a quantum of light). Atmospheric gas is collected for many (6) hours and xenon extracted through a series of filters, absorbers, gas chromatograph, etc events every 15 minutes per m 3 of air! Sampling Activated Gas Detection Pump Charcoal Chromatograph System Air Inlet Molecular Sieve Molecular Sieve Xenon is passed into the chamber of a hollow cylinder made of plastic scintillator inserted in a cylindrical hole inside a NaI crystal. Light produced by β and γ particles is detected with photomultiplier tubes and counted. Molecular Sieve
33 Research Introductions - November 10, 2010 p. 1 Getting the Right Gun Background studies of known sources are required to eliminate false positives. Atmospheric transport modeling (ATM) is done to determine the effect of known backgrounds and hypothesized nuclear explosions. Comparison of ATM with background and signal. CRL emissions Consistent with venting about 10% of the 133 Xe.
34 Research Introductions - November 10, 2010 p. 2 Another Test for the Test Ban On May 25, 2009 the North Koreans test again - seismic signature is detected by 61 IMS stations.
35 Research Introductions - November 10, 2010 p. 2 Another Test for the Test Ban On May 25, 2009 the North Koreans test again - seismic signature is detected by 61 IMS stations. No radioxenons are detected at any of the IMS stations!
36 Research Introductions - November 10, 2010 p. 2 Another Test for the Test Ban On May 25, 2009 the North Koreans test again - seismic signature is detected by 61 IMS stations. No radioxenons are detected at any of the IMS stations! What went wrong?
37 Research Introductions - November 10, 2010 p. 2 Another Test for the Test Ban On May 25, 2009 the North Koreans test again - seismic signature is detected by 61 IMS stations. No radioxenons are detected at any of the IMS stations! What went wrong? Did the North Koreans fake it? No signs of that. Was it sealed? : 6 of 335 US tests released radiation. Abundant, public information on containing gases from nuclear blasts.
38 Research Introductions - November 10, 2010 p. 2 Another Test for the Test Ban On May 25, 2009 the North Koreans test again - seismic signature is detected by 61 IMS stations. No radioxenons are detected at any of the IMS stations! What went wrong? Did the North Koreans fake it? No signs of that. Was it sealed? : 6 of 335 US tests released radiation. Abundant, public information on containing gases from nuclear blasts. Are seismic sensors enough? J. Medalia, North Korea s 2009 Nuclear Test: Containment, Monitoring, Implications, Congressional Research Service, R41160, April 2, 2010.
39 Research Introductions - November 10, 2010 p. 2 Another Test for the Test Ban On May 25, 2009 the North Koreans test again - seismic signature is detected by 61 IMS stations. No radioxenons The are American detected Geophysical at any of the Union IMS stations! and the Seismological Society of America have stated the IMS What went wrong? will detect all explosions down to 1 kiloton (and much less in some areas) and within a radius of Did the North Koreans fake it? No signs of that. 35 km (October, 2009). Was it sealed? : 6 of 335 US tests released radiation. Abundant, public information on containing gases from nuclear blasts. Are seismic sensors enough? J. Medalia, North Korea s 2009 Nuclear Test: Containment, Monitoring, Implications, Congressional Research Service, R41160, April 2, 2010.
40 Research Introductions - November 10, 2010 p. 2 Why Should You Care? The President is committed to bringing the CTBT to a vote for ratification in the Senate.
41 Research Introductions - November 10, 2010 p. 2 Why Should You Care? The President is committed to bringing the CTBT to a vote for ratification in the Senate.... clandestine nuclear tests could not be verified (by the IMS).... even when Pyongyang declared that it would conduct a nuclear-weapons test and announced where and when it would occur, this monitoring system failed to collect necessary radioactive gases and particulates to prove that a test had occurred. Senator Jon Kyl - R, Arizona: Why We Need to Test Nuclear Weapons, Wall Street Journal, October 20, 2009.
42 Research Introductions - November 10, 2010 p. 2 Why Should You Care? The President is committed to bringing the CTBT to a vote for ratification in the Senate.... clandestine nuclear tests could not be verified (by the IMS).... even when Pyongyang declared that it would conduct a nuclear-weapons test and announced where and when it would occur, this monitoring system failed to collect necessary radioactive gases and particulates to prove that a test had occurred. Senator Jon Kyl - R, Arizona: Why We Need to Test Nuclear Weapons, Wall Street Journal, October 20, The worst-case scenario under a no-ctbt regime poses far bigger threats to U.S. security - sophisticated nuclear weapons in the hands of many more adversaries - than the worst-case scenario of clandestine testing in a CTBT regime, within the constraints posed by the monitoring system. National Academy of Sciences (NAS), Technical Issues Related to the Comprehensive Nuclear-Test-Ban Treaty, Washington, D.C., National Academy Press, 2002, pp. 10.
43 Research Introductions - November 10, 2010 p. 2 Research Opportunities in Nuclear Non-proliferation Congress recently passed the Nuclear Forensics and Attribution Act (Feb, 2010). Creates the National Technical Nuclear Forensics Center within the Domestic Nuclear Detection Office (DNDO) of the Department of Homeland Security (DHS). Establishes fellowships for undergraduates (summer research) and graduate students and awards for their advisors. Examples of DNDO research. Hope College - Cathodoluminescent Signatures of Neutron Irradiation. CUNY - Infrared Studies of CdMgTe as the Material of Choice for Room Temperature Gamma-Ray Detectors Stanford - Improved Transparent Ceramic Fabrication Techniques for Radiological and Nuclear Detectors US National Labs PNNL - Triple Coincidence Radioxenon Detector Office of Defense Nuclear Nonproliferation (part of NNSA).
44 Research Introductions - November 10, 2010 p. 2 So You Want To Do Science? Read! You are likely not trained enough yet to read the scientific literature, but there are abundant sources of books, stories, movies, etc that describe science. A Short History of Nearly Everything by Bill Bryson. Anything by Richard Preston - Hot Zone, First Light, Demon in the Freezer, The Wild Trees Scientific American Do research - here or elsewhere. Summer research fellowships. Summer research/technical jobs in industry, hospitals,... Volunteer in government (state of federal) for specific committees/elected officials that have a scientific component. Non-governmental organizations (NGOs) like Union of Concerned Scientists, Federation of American Scientists,... Read some more. Go to talks at museums, universities, high schools, wherever. Ask questions!!! And then ask some more!!
45 So You Want To Do Science? Research Introductions - November 10, 2010 p. 2
46 So You Want To Do Science? Research Introductions - November 10, 2010 p. 2
47 Research Introductions - November 10, 2010 p. 2 So You Want To Do Science? Some great places to start looking:
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