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PHY3708 101/3 Question5 Using the wrmi-empirical mass formula (SEMF), estimate the binding energy per ucleon for 10B AL MCo and 2 Question 1 A sealed box was found which stated to have contained an alloy composed of two metals A and B. These metals are radioactive, with half eual parts respectively and when the container was opened it was found to contain c B. Deduce the age of the alloy. lives of 12 years and 18 years. 0.53 kg of A and 2.20 kg of Question 2 Knowing that the height of the Coulomb barrier is given by b barrier for a-emission for the nuclei s°Ca, 112Sn and 22Th the energy of the a-particle are 6.5 MeV, 4 MeV and 8.3 MeV, respectively, calculate the corre- (a) calculate the height of the Coulom sponding half-lives. Question 3 figure below. The 2.9 MeV level then decays into 2 alpha-particles with a half-live of 10-22s. The Li ground state has a half-life of 0.85 s and decays to the 2.9 MeV level in Be as shown in the 15 Mev 2 2.9 Mev 2α Ground State Be (a) What is the parity of the 2.9 MeV level in sBe? Give your reasoning (b) Why is the half-l life of the Be 2.9 MeV level so much smaller than the half life of the Li ground state? (c) Where in energy, with respect to the neutron capture? Why? e ground state, would you Question 4 The ground state of Br has j J(178.1 keV). List the the state and the first two excited states have(26.92 keV) and e possible γ-transitions between these levels and estimate the lifetime of -transitio 13

Answer 1

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