Section 2 the nucleus

    • What is the cross-sectional area of a heavy nucleus?

      Interaction cross sections for most nuclei are typically between 10-27and 10-21cm2. To avoid the inconvenience of working with such small numbers, a different unit of area is used the barn, denoted by the symbol b. It is defined to be 10-24 cm2, so that the physical cross-sectional area of a heavy nucleus is about 2 b.

    • How do neutrons interact with nuclei?

      They interact via physical collisions with nuclei (target nuclei). • A neutron might scatter off the nucleus or General 3 combine with the nucleus. • When the neutron combines with a nucleus, some type of particle might be emitted (e.g., proton, alpha particle) and/or a “prompt” gamma ray.

    • What is the cross section for the absorbance of neutrons?

      The cross section for being absorbed is the probability of neutrons being absorbt+ di~ded by the anal atom density (the number of target atoms P& unit area of the layer): @e cross section thus has the dimensions of -, it must be a small flaction of a sqyiye centimeter becausk of the large’number of atoms involved.

    • What is the probability of a single neutron hitting a nucleus?

      The probability of a single neutron hitting one of these nuclei is roughly the ratio of the total target area Ns to the area of the layer A. In other word$ the probability of a single neutron having a collision with a nuckus is Ns/A or (N/A)s, the areal target density timess.

    • [PDF File]Fission Cross Section Theory - T-2

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      LLNL-PRES-734385 3 Outline § Compound nucleus reaction theory • From resonances to Hauser-Feshbach cross-section theory § Fission in the transition state model • A fission model for the Hauser-Feshbach formula § Practical applications • A cross-section code, and some thoughts about evaluations and uncertainty quantification

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    • [PDF File]Interaction of Neutrons with Matter

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      Feb 04, 2011 · 2. Absorb the neutrons • Hydrogenous materials are also very effective at absorbing neutrons - the cross section for neutron capture by H-1 is 0.33 barns. Neutron Shielding 37 • Unfortunately, a difficult to shield 2.2 MeV gamma ray is emitted when H-1 absorbs a neutron. • Boron can be incorporated into the shield – it has a large

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    • Nuclei: Z, N, and A

      the half-life of the nucleus, T 1/2 •Assume an initial number of nuclei, N 0, are present in a sample at t = 0 •At time t = T 1/2, half of the nuclei will have decayed •Leaving half as many nuclei, with the same decay probability, •Number will be cut in …

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    • [PDF File]Section 1 The Nucleus Section 2 Nuclear Decay Section 3 ...

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      Subatomic Physics Section 1 © Houghton Mifflin Harcourt Publishing Company Preview Section 1 The Nucleus Section 2 Nuclear Decay Section 3 Nuclear Reactions

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    • [PDF File]CHAPTER 2 : CELL STRUCTURE AND FUNCTIONS

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      CHAPTER 2 : CELL STRUCTURES AND FUNCTIONS SUBTOPIC: 2.2 Structures and functions: Cell membrane and organelles LEARNING OUTCOMES: a) Show the detailed structures of typical plant and animal cells and state the organelles present. b) Explain the structures and functions of the following organelles : nucleus, rough endoplasmic

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    • [PDF File]Section 7–2 Eukaryotic Cell Structure

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      Nucleus (page 176) 5. What is the function of the nucleus?It is the control center of the cell. 6. What important molecules does the nucleus contain?It contains DNA. 7. The granular material visible within the nucleus is called .chromatin Vacuole Mitochondrion Chloroplast Nucleus Ribosome Section 7–2 Eukaryotic Cell Structure(pages 174–181)

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    • [PDF File]Section 2–1 The Nature of Matter

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      Section 2–1 The Nature of Matter(pages 35–39) This section identifies the three particles that make up atoms. It also explains how atoms of the same element can have a different number of neutrons and describes the two main types of chemical bonds. Atoms (page 35) 1. The basic unit of matter is called a(an) . 2. Describe the nucleus of an atom.

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    • [PDF File]Chapter 2 Section 2 Notes The Nucleus

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      Chapter 2 Section 2 Notes The Nucleus I. Identifying Numbers A. Atomic Number 1. The number of protons in the nucleus of an atom 2. This number never changes without changing the identity of the atom 3. Isotopes are atoms of the same element that have different numbers of neutrons B. Mass Number—the number of Protons plus Neutrons

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    • [PDF File]Chapter 18 NuClear Chemistry

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      the nucleus compared to the size of the atom, and the modern description of the electron. (Section 2.4) Write the definitions for isotope, atomic . number, and mass number. (Chapter 2 . Glossary) Write the definitions for energy, kinetic energy, and potential energy. (Chapter 7 . Glossary.) Write or identify a description of the Law of ...

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    • [PDF File]Section Name Date 1.2 Cells

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      nucleus: The nucleus of the cell controls all the cell’s activities. cytoplasm : This clear, jelly-like fluid holds the organelles of the cell in place. mitochondria : These bean-shaped structures are the energy producers.

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    • [PDF File]CHAPTER Atoms SECTION 2 The Structure of Atoms

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      its nucleus. Therefore, the nucleus of a helium atom has a charge of 2. However, a helium atom also has two electrons. The electrons have a charge of 2. The 2 charge of the electrons balances out the 2 charge of the nucleus. As a result, the helium atom is neutral. Sometimes, atoms can gain or lose electrons. When this happens, an ion forms.

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    • [PDF File]Section 2 The Atom - Travellin

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      Section 2 The Atom Key Concept An atom is made of protons, neutrons, and electrons. Its properties are determined by these particles. What You Will Learn • Protons, neutrons, and electrons make up atoms. • All atoms of a given element have the same number of protons in the nucleus.

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    • [PDF File]Westinghouse Technology Systems Manual Section 2.1 Reactor ...

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      given reaction will occur is defined as the cross section of the nucleus for that specified reaction. More precisely, this measure is referred to as the microscopic

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