The radioactive isotope 12 7N undergoes b+ decay. The energy released in the decay of one nucleus is 16.316 MeV. What is the mass, in amu, of a neutral 12 7N atom? Give your answer to eight significant figures.
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The radioactive isotope 12 7N undergoes b+ decay. The energy released in the decay of one nucleus is 16.316 MeV. What is the mass, in amu, of a neutral 12 7N atom? Give your answer to eight significant figures.
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- A nucleus of 238 Np captures a thermal neutron to form a nucleus of 239 Np . What is the excitation energy ( to 1 dp ) in MeV for this process ?Uranium (protons = 92, neutrons = 146, atomic mass = 238.050788 u) decays via alpha decay to Thorium (protons = 90, neutrons = 144, atomic mass = 234.043601 u). What is the kinetic energy of the emitted alpha particle? (Hint: Any energy that is not locked up in rest energy of the product nuclei will go to kinetic energy in the alpha particle.) (Hint: the answer is 4.27 MeV)A new element has been created artificially. It is named Elementy McFacium. The most common isotope of McFacium has 153 protons and 277 neutrons. The mass of this isotope of the new element is 402,188.91 MeV/c^2. What is the total mass deficit for the nucleus? Hint: The new element is not made as an ion! Use the mass of hydrogen atoms instead of protons. (Answer in atomic mass units u)
- On absorption of a single neutron, plutonium Pu-239 can undergo fission into xenon Xe-134 plus zirconium Zr-103 plus three neutrons. The masses of these nuclei are, mpu-239 = 239.052 amu, mxe-134 = 133.905 amu, and mzr-103 = 102.927 amu. Calculate the energy given off in this nuclear reaction. Back Alt+Left arrowThe nucleus of a lithium atom is 3 ^ 7 Li and its mass is 7.0160 amu. Calculate the binding energy in MeV. The relevant masses are, for the neutron, 1.0087 amu, and the proton 1.0073 amu. 1 amu is equivalent to 931 MeVOn absorption of a single neutron, plutonium Pu-239 can undergo fission into xenon Xe-134 plus zirconium Zr-103 plus three neutrons. The masses of these nuclei are, mpu-239 = 239.052 amu, mxe-134 = 133.905 amu, and mzr-103 = 102.927 amu. Calculate the energy given off in this nuclear reaction.
- One of the fusion reactions that takes place as a star ages is called the triple alpha process. 3 42He → 126C Calculate the mass defect (in u) and the energy produced (in MeV) each time the reaction takes place.A thorium-228 atom (mass = 228.0287 u) decays to radium-224 (mass = 224.0202 u) through alpha emission (mass 4.0026 u). The equation is shown below. How much energy is released from this reaction? 228Th - 90 224 Ra +He+energy (a) 1.2 MeV (b) 2.4 MeV (c) 4.1 MeV (d) 5.5 MeV