Nuclear Glossary
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Glossary Derived From: Human Research Program Integrated Research Plan, Revision A, (January 2009)
Glossary derived from: Human Research Program Integrated Research Plan, Revision A, (January 2009). National Aeronautics and Space Administration, Johnson Space Center, Houston, Texas 77058, pages 232-280. Report No. 153: Information Needed to Make Radiation Protection Recommendations for Space Missions Beyond Low-Earth Orbit (2006). National Council on Radiation Protection and Measurements, pages 309-318. Reprinted with permission of the National Council on Radiation Protection and Measurements, http://NCRPonline.org . Managing Space Radiation Risk in the New Era of Space Exploration (2008). Committee on the Evaluation of Radiation Shielding for Space Exploration, National Research Council. National Academies Press, pages 111-118. -A- AAPM: American Association of Physicists in Medicine. absolute risk: Expression of excess risk due to exposure as the arithmetic difference between the risk among those exposed and that obtaining in the absence of exposure. absorbed dose (D): Average amount of energy imparted by ionizing particles to a unit mass of irradiated material in a volume sufficiently small to disregard variations in the radiation field but sufficiently large to average over statistical fluctuations in energy deposition, and where energy imparted is the difference between energy entering the volume and energy leaving the volume. The same dose has different consequences depending on the type of radiation delivered. Unit: gray (Gy), equivalent to 1 J/kg. ACE: Advanced Composition Explorer Mission, launched in 1997 and orbiting the L1 libration point to sample energetic particles arriving from the Sun and interstellar and galactic sources. It also provides continuous coverage of solar wind parameters and solar energetic particle intensities (space weather). When reporting space weather, it can provide an advance warning (about one hour) of geomagnetic storms that can overload power grids, disrupt communications on Earth, and present a hazard to astronauts. -
Harry Moseley: Numbering the Elements
MYSTERY OF MATTER: SEARCH FOR THE ELEMENTS 5. Harry Moseley: Numbering the Elements Dmitri Mendeleev (identified on screen) works on the Periodic Table, writes down the atomic weights of the elements. NARR: Previously on The Mystery of Matter… HISTORIAN MICHAEL GORDIN VO He figures out something rather extraordinary about the elements. DMITRI MENDELEEV, partly in VO The eye is immediately struck by a pattern within the horizontal rows and the vertical columns. Mendeleev’s first table morphs into the familiar modern Periodic Table. AUTHOR ERIC SCERRI VO He found an absolutely fundamental principle of nature. Humphry Davy (identified on screen) performs an experiment with his voltaic pile. HISTORIAN DAVID KNIGHT VO Somehow the particles of matter have to be glued together to form molecules. What Davy has had is a big idea. Perhaps electricity could be this kind of glue. Marie Curie (identified on screen) sits down at the spectroscope and peers into the eyepiece. NARR: The spectroscope kicked off a whole new round in the discovery of elements. The spectra of four elements appear on screen, along with their names. PHYSICIST DAVID KAISER VO It’s almost like each element has its own bar code. Marie and Pierre enter their lab at night and see vials of radium glowing on the shelves. MARIE TO PIERRE Don’t light the lamps! Look! 1 MYSTERY OF MATTER: SEARCH FOR THE ELEMENTS PHYSICIST DAVID KAISER VO Radioactivity was a sign that the atom itself was unstable. It could break apart. Marie and Pierre look in wonder at their radiant element. NARR: Scientists now had a pressing new question to answer: What’s inside the atom? Fade to black ANNOUNCER: Major funding for The Mystery of Matter: Search for the Elements was provided by the National Science Foundation, where discoveries begin. -
Discovery of the Isotopes with Z<= 10
Discovery of the Isotopes with Z ≤ 10 M. Thoennessen∗ National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA Abstract A total of 126 isotopes with Z ≤ 10 have been identified to date. The discovery of these isotopes which includes the observation of unbound nuclei, is discussed. For each isotope a brief summary of the first refereed publication, including the production and identification method, is presented. arXiv:1009.2737v1 [nucl-ex] 14 Sep 2010 ∗Corresponding author. Email address: [email protected] (M. Thoennessen) Preprint submitted to Atomic Data and Nuclear Data Tables May 29, 2018 Contents 1. Introduction . 2 2. Discovery of Isotopes with Z ≤ 10........................................................................ 2 2.1. Z=0 ........................................................................................... 3 2.2. Hydrogen . 5 2.3. Helium .......................................................................................... 7 2.4. Lithium ......................................................................................... 9 2.5. Beryllium . 11 2.6. Boron ........................................................................................... 13 2.7. Carbon.......................................................................................... 15 2.8. Nitrogen . 18 2.9. Oxygen.......................................................................................... 21 2.10. Fluorine . 24 2.11. Neon........................................................................................... -
Cherenkov Radiation
TheThe CherenkovCherenkov effecteffect A charged particle traveling in a dielectric medium with n>1 radiates Cherenkov radiation B Wave front if its velocity is larger than the C phase velocity of light v>c/n or > 1/n (threshold) A β Charged particle The emission is due to an asymmetric polarization of the medium in front and at the rear of the particle, giving rise to a varying electric dipole momentum. dN Some of the particle energy is convertedγ = 491into light. A coherent wave front is dx generated moving at velocity v at an angle Θc If the media is transparent the Cherenkov light can be detected. If the particle is ultra-relativistic β~1 Θc = const and has max value c t AB n 1 cosθc = = = In water Θc = 43˚, in ice 41AC˚ βct βn 37 TheThe CherenkovCherenkov effecteffect The intensity of the Cherenkov radiation (number of photons per unit length of particle path and per unit of wave length) 2 2 2 2 2 Number of photons/L and radiation d N 4π z e 1 2πz 2 = 2 1 − 2 2 = 2 α sin ΘC Wavelength depends on charge dxdλ hcλ n β λ and velocity of particle 2πe2 α = Since the intensity is proportional to hc 1/λ2 short wavelengths dominate dN Using light detectors (photomultipliers)γ = sensitive491 in 400-700 nm for an ideally 100% efficient detector in the visibledx € 2 dNγ λ2 d Nγ 2 2 λ2 dλ 2 2 11 1 22 2 d 2 z sin 2 z sin 490393 zz sinsinΘc photons / cm = ∫ λ = π α ΘC ∫ 2 = π α ΘC 2 −− 2 = α ΘC λ1 λ1 dx dxdλ λ λλ1 λ2 d 2 N d 2 N dλ λ2 d 2 N = = dxdE dxdλ dE 2πhc dxdλ Energy loss is about 104 less hc 2πhc than 2 MeV/cm in water from € -
Photofission Cross Sections of 238U and 235U from 5.0 Mev to 8.0 Mev Robert Andrew Anderl Iowa State University
Iowa State University Capstones, Theses and Retrospective Theses and Dissertations Dissertations 1972 Photofission cross sections of 238U and 235U from 5.0 MeV to 8.0 MeV Robert Andrew Anderl Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/rtd Part of the Nuclear Commons, and the Oil, Gas, and Energy Commons Recommended Citation Anderl, Robert Andrew, "Photofission cross sections of 238U and 235U from 5.0 MeV to 8.0 MeV " (1972). Retrospective Theses and Dissertations. 4715. https://lib.dr.iastate.edu/rtd/4715 This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Retrospective Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. INFORMATION TO USERS This dissertation was produced from a microfilm copy of the original document. While the most advanced technological means to photograph and reproduce this document have been used, the quality is heavily dependent upon the quality of the original submitted. The following explanation of techniques is provided to help you understand markings or patterns which may appear on this reproduction, 1. The sign or "target" for pages apparently lacking from the document photographed is "Missing Page(s)". If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting thru an image and duplicating adjacent pages to insure you complete continuity, 2. -
R-Process: Observations, Theory, Experiment
r-process: observations, theory, experiment H. Schatz Michigan State University National Superconducting Cyclotron Laboratory Joint Institute for Nuclear Astrophysics 1. Observations: do we need s,r,p-process and LEPP? 2. r-process (and LEPP?) models 3. r-process experiments SNR 0103-72.6 Credit: NASA/CXC/PSU/S.Park et al. Origin of the heavy elements in the solar system s-process: secondary • nuclei can be studied Æ reliable calculations • site identified • understood? Not quite … r-process: primary • most nuclei out of reach • site unknown p-process: secondary (except for νp-process) Æ Look for metal poor`stars (Pagel, Fig 6.8) To learn about the r-process Heavy elements in Metal Poor Halo Stars CS22892-052 (Sneden et al. 2003, Cowan) 2 1 + solar r CS 22892-052 ) H / X CS22892-052 ( g o red (K) giant oldl stars - formed before e located in halo Galaxyc was mixed n distance: 4.7 kpc theya preserve local d mass ~0.8 M_sol n pollutionu from individual b [Fe/H]= −3.0 nucleosynthesisa events [Dy/Fe]= +1.7 recall: element number[X/Y]=log(X/Y)-log(X/Y)solar What does it mean: for heavy r-process? For light r-process? • stellar abundances show r-process • process is not universal • process is universal • or second process exists (not visible in this star) Conclusions depend on s-process Look at residuals: Star – solar r Solar – s-process – p-process s-processSimmerer from Simmerer (Cowan et etal.) al. /Lodders (Cowan et al.) s-processTravaglio/Lodders from Travaglio et al. -0.50 -0.50 -1.00 -1.00 -1.50 -1.50 log e log e -2.00 -2.00 -2.50 -2.50 30 40 50 60 70 80 90 30 40 50 60 70 80 90 Element number Element number ÆÆNeedNeed reliable reliable s-process s-process (models (models and and nu nuclearclear data, data, incl. -
Uses of Isotopic Neutron Sources in Elemental Analysis Applications
EG0600081 3rd Conference on Nuclear & Particle Physics (NUPPAC 01) 20 - 24 Oct., 2001 Cairo, Egypt USES OF ISOTOPIC NEUTRON SOURCES IN ELEMENTAL ANALYSIS APPLICATIONS A. M. Hassan Department of Reactor Physics Reactors Division, Nuclear Research Centre, Atomic Energy Authority. Cairo-Egypt. ABSTRACT The extensive development and applications on the uses of isotopic neutron in the field of elemental analysis of complex samples are largely occurred within the past 30 years. Such sources are used extensively to measure instantaneously, simultaneously and nondestruclively, the major, minor and trace elements in different materials. The low residual activity, bulk sample analysis and high accuracy for short lived elements are improved. Also, the portable isotopic neutron sources, offer a wide range of industrial and field applications. In this talk, a review on the theoretical basis and design considerations of different facilities using several isotopic neutron sources for elemental analysis of different materials is given. INTRODUCTION In principle there are two ways to use neutrons for elemental and isotopic abundance analysis in samples. One is the neutron activation analysis which we call it the "off-line" where the neutron - induced radioactivity is observed after the end of irradiation. The other one we call it the "on-line" where the capture gamma-rays is observed during the neutron bombardment. Actually, the sequence of events occurring during the most common type of nuclear reaction used in this analysis namely the neutron capture or (n, gamma) reaction, is well known for the people working in this field. The neutron interacts with the target nucleus via a non-elastic collision, a compound nucleus forms in an excited state. -
Radiation and Radioactivity Quantified? Do You Think of These “People” When I Say RADIATION? Do You Think of These Things As Well?
Welcome To RadTown USA •Click to Explore RadTown USA • Click on any location in RadTown USA and find out about radiation sources or uses at that location. The Alpha, Beta, Gammas of Nuclear Education March 2nd, 2014 Fundamentals of Ionizing Radiation Debra N Thrall, PhD Executive Director Albert I Pierce Foundation Radiation Fundamentals What is radiation? Where does it come from? How does it interact with matter? What is radioactivity? What are fission and fusion? How are radiation and radioactivity quantified? Do you think of these “people” when I say RADIATION? Do you think of these things as well? • Food • Space • Utilities • Consumer Products • Medicine Brief History of the Atom • 500 BC Democritus Atom • Long time (Romans Dark Ages) • 1808 AD Dalton Plum Pudding • 1911 Rutherford Nucleus • 1913 Bohr Orbits • 1920’s Many People Quantum Mechanics Rutherford’s Gold Foil Experiment The Design 1. Bombard positively charged alpha particles into thin gold foil. 2. Use fluorescent screen to detect particles as they exit the gold foil. 3. Use angle of deflection to determine interior of the atom. So, What is an Atom? • Atoms are made up of protons, neutrons & electrons • Protons: + charge p+ • Neutrons: no charge n0 • Electrons: - charge e- • Atoms want to have a stable energy level • This translates to having no net charge • # protons = # electrons Mass of an Atom • Masses • Proton: 1.000000 amu • Neutron: 1.000000 amu • Electron: 0.000549 amu (Translates to 1.2 lbs/1 ton ~ a kitten on an elephant!) • The mass of an atom is approximately -
Two-Proton Radioactivity 2
Two-proton radioactivity Bertram Blank ‡ and Marek P loszajczak † ‡ Centre d’Etudes Nucl´eaires de Bordeaux-Gradignan - Universit´eBordeaux I - CNRS/IN2P3, Chemin du Solarium, B.P. 120, 33175 Gradignan Cedex, France † Grand Acc´el´erateur National d’Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, BP 55027, 14076 Caen Cedex 05, France Abstract. In the first part of this review, experimental results which lead to the discovery of two-proton radioactivity are examined. Beyond two-proton emission from nuclear ground states, we also discuss experimental studies of two-proton emission from excited states populated either by nuclear β decay or by inelastic reactions. In the second part, we review the modern theory of two-proton radioactivity. An outlook to future experimental studies and theoretical developments will conclude this review. PACS numbers: 23.50.+z, 21.10.Tg, 21.60.-n, 24.10.-i Submitted to: Rep. Prog. Phys. Version: 17 December 2013 arXiv:0709.3797v2 [nucl-ex] 23 Apr 2008 Two-proton radioactivity 2 1. Introduction Atomic nuclei are made of two distinct particles, the protons and the neutrons. These nucleons constitute more than 99.95% of the mass of an atom. In order to form a stable atomic nucleus, a subtle equilibrium between the number of protons and neutrons has to be respected. This condition is fulfilled for 259 different combinations of protons and neutrons. These nuclei can be found on Earth. In addition, 26 nuclei form a quasi stable configuration, i.e. they decay with a half-life comparable or longer than the age of the Earth and are therefore still present on Earth. -
Correlated Neutron Emission in Fission
Correlated neutron emission in fission S. Lemaire , P. Talou , T. Kawano , D. G. Madland and M. B. Chadwick ¡ Nuclear Physics group, Los Alamos National Laboratory, Los Alamos, NM, 87545 Abstract. We have implemented a Monte-Carlo simulation of the fission fragments statistical decay by sequential neutron emission. Within this approach, we calculate both the center-of-mass and laboratory prompt neutron energy spectra, the ¢ prompt neutron multiplicity distribution P ν £ , and the average total number of emitted neutrons as a function of the mass of ¢ the fission fragment ν¯ A £ . Two assumptions for partitioning the total available excitation energy among the light and heavy fragments are considered. Preliminary results are reported for the neutron-induced fission of 235U (at 0.53 MeV neutron energy) and for the spontaneous fission of 252Cf. INTRODUCTION Methodology In this work, we extend the Los Alamos model [1] by A Monte Carlo approach allows to follow in detail any implementing a Monte-Carlo simulation of the statistical reaction chain and to record the result in a history-type decay (Weisskopf-Ewing) of the fission fragments (FF) file, which basically mimics the results of an experiment. by sequential neutron emission. This approach leads to a We first sample the FF mass and charge distributions, much more detailed picture of the decay process and var- and pick a pair of light and heavy nuclei that will then de- ious physical quantities can then be assessed: the center- cay by emitting zero, one or several neutrons. This decay of-mass and laboratory prompt neutron energy spectrum sequence is governed by neutrons emission probabilities ¤ ¤ ¥ N en ¥ , the prompt neutron multiplicity distribution P n , at different temperatures of the compound nucleus and the average number of emitted neutrons as a function of by the energies of the emitted neutrons. -
Recent Developments in Radioactive Charged-Particle Emissions
Recent developments in radioactive charged-particle emissions and related phenomena Chong Qi, Roberto Liotta, Ramon Wyss Department of Physics, Royal Institute of Technology (KTH), SE-10691 Stockholm, Sweden October 19, 2018 Abstract The advent and intensive use of new detector technologies as well as radioactive ion beam facilities have opened up possibilities to investigate alpha, proton and cluster decays of highly unstable nuclei. This article provides a review of the current status of our understanding of clustering and the corresponding radioactive particle decay process in atomic nuclei. We put alpha decay in the context of charged-particle emissions which also include one- and two-proton emissions as well as heavy cluster decay. The experimental as well as the theoretical advances achieved recently in these fields are presented. Emphasis is given to the recent discoveries of charged-particle decays from proton-rich nuclei around the proton drip line. Those decay measurements have shown to provide an important probe for studying the structure of the nuclei involved. Developments on the theoretical side in nuclear many-body theories and supercomputing facilities have also made substantial progress, enabling one to study the nuclear clusterization and decays within a microscopic and consistent framework. We report on properties induced by the nuclear interaction acting in the nuclear medium, like the pairing interaction, which have been uncovered by studying the microscopic structure of clusters. The competition between cluster formations as compared to the corresponding alpha-particle formation are included. In the review we also describe the search for super-heavy nuclei connected by chains of alpha and other radioactive particle decays. -
Nuclear Fusion Enhances Cancer Cell Killing Efficacy in a Protontherapy Model
Nuclear fusion enhances cancer cell killing efficacy in a protontherapy model GAP Cirrone*, L Manti, D Margarone, L Giuffrida, A. Picciotto, G. Cuttone, G. Korn, V. Marchese, G. Milluzzo, G. Petringa, F. Perozziello, F. Romano, V. Scuderi * Corresponding author Abstract Protontherapy is hadrontherapy’s fastest-growing modality and a pillar in the battle against cancer. Hadrontherapy’s superiority lies in its inverted depth-dose profile, hence tumour-confined irradiation. Protons, however, lack distinct radiobiological advantages over photons or electrons. Higher LET (Linear Energy Transfer) 12C-ions can overcome cancer radioresistance: DNA lesion complexity increases with LET, resulting in efficient cell killing, i.e. higher Relative Biological Effectiveness (RBE). However, economic and radiobiological issues hamper 12C-ion clinical amenability. Thus, enhancing proton RBE is desirable. To this end, we exploited the p + 11Bà3a reaction to generate high-LET alpha particles with a clinical proton beam. To maximize the reaction rate, we used sodium borocaptate (BSH) with natural boron content. Boron-Neutron Capture Therapy (BNCT) uses 10B-enriched BSH for neutron irradiation-triggered alpha-particles. We recorded significantly increased cellular lethality and chromosome aberration complexity. A strategy combining protontherapy’s ballistic precision with the higher RBE promised by BNCT and 12C-ion therapy is thus demonstrated. 1 The urgent need for radical radiotherapy research to achieve improved tumour control in the context of reducing the risk of normal tissue toxicity and late-occurring sequelae, has driven the fast- growing development of cancer treatment by accelerated beams of charged particles (hadrontherapy) in recent decades (1). This appears to be particularly true for protontherapy, which has emerged as the most-rapidly expanding hadrontherapy approach, totalling over 100,000 patients treated thus far worldwide (2).