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Chapter 43: Q2P (page 1331)

The nuclide238Np requires4.2 MeVfor fission. To remove a neutron from this nuclide requires an energy expenditure of 5.0 MeV. Isfissionable by thermal neutrons?

Short Answer

Expert verified

The 237Npis fissionable by thermal neutrons.

Step by step solution

01

A concept and identification of given data:

The energy required for the fission of a nuclide varies with the number of the nucleon in the nuclide or the mass number of that nuclide.

The energy required for the fission of 238Npis E1=4.2MeV.

The energy required for the fission of 237Npis E2=5MeV.

02

Whether Np-237 is fissionable by thermal neutrons:

The mass number of 238Npis 237Npand energy required for fission is 4.2 MeV. The mass number of 237Np is 237 and energy required for fission is 5 Me V which is more than the energy required for fission of 238Npso the 237Npis fissionable by thermal neutrons.

Hence, the 237Npis fissionable by thermal neutrons.

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Most popular questions from this chapter

A nuclear reactor is operating at a certain power level, with its multiplication factor k adjusted to unity. If the control rods are used to reduce the power output of the reactor to 25% of its former value, is the multiplication factor now a little less than unity, substantially less than unity, or still equal to unity?

Verify that the fusion of1.0 kgof deuterium by the reaction2H+2H→3He+n(Q=+3.27MeV)could keep a100 Wlamp burning for2.5×104y.

(a) – (d) Complete the following table, which refers to the generalized fission reaction

U+n→X+Y+bn235

Figure 43-15 shows an early proposal for a hydrogen bomb. The fusion fuel is deuterium,H2. The high temperature and particle density needed for fusion are provided by an atomic bomb “trigger” that involves a U235orPu239fission fuel arranged to impress an imploding, compressive shock wave on the deuterium. The fusion reaction is

52H→3He+4He+1H+2n

(a) Calculate Q for the fusion reaction. For needed atomic masses, see Problem 42. (b) Calculate the rating (see Problem 16) of the fusion part of the bomb if it contains 500 kg of deuterium, 30.0% of which undergoes fusion.

Question: A 66 kiloton atomic bomb is fueled with pure U235(Fig. 43-14), 4.0%of which actually undergoes fission. (a) What is the mass of the uranium in the bomb? (It is not 66 kilotons—that is the amount of released energy specified in terms of the mass of TNT required to produce the same amount of energy.) (b) How many primary fission fragments are produced? (c) How many fission neutrons generated are released to the environment? (On average, each fission produces 2.5 neutrons.)
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