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- https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Physics_II_(2212)/11%3A__Nuclear_Physics/11.04%3A_Nuclear_ReactionsThe positron 01e is emitted with the neutrino ν, and the neutron remains in the nucleus. (Like β− decay, the positron does not precede the decay but is produced in the decay.) For...The positron 01e is emitted with the neutrino ν, and the neutron remains in the nucleus. (Like β− decay, the positron does not precede the decay but is produced in the decay.) For an isolated proton, this process is impossible because the neutron is heavier than the proton.
- https://phys.libretexts.org/Bookshelves/Nuclear_and_Particle_Physics/Nuclear_and_Particle_Physics_(Walet)/04%3A_Nuclear_Models/4.04%3A_Barrier_PenetrationTo understand quantum mechanical tunnelling in fission it makes sense to look at the simplest fission process: the emission of a He nucleus, so called α radiation
- https://phys.libretexts.org/Bookshelves/College_Physics/College_Physics_1e_(OpenStax)/31%3A_Radioactivity_and_Nuclear_Physics/31.04%3A_Nuclear_Decay_and_Conservation_LawsNuclear decay has provided an amazing window into the realm of the very small. Nuclear decay gave the first indication of the connection between mass and energy, and it revealed the existence of two o...Nuclear decay has provided an amazing window into the realm of the very small. Nuclear decay gave the first indication of the connection between mass and energy, and it revealed the existence of two of the four basic forces in nature. In this section, we explore the major modes of nuclear decay; and, like those who first explored them, we will discover evidence of previously unknown particles and conservation laws.
- https://phys.libretexts.org/Bookshelves/Nuclear_and_Particle_Physics/Introduction_to_Applied_Nuclear_Physics_(Cappellaro)/03%3A_Radioactive_Decay_Part_I/3.03%3A_Alpha_DecaySince the final state is known to have an energy Qα=4.3 MeV, we will take this energy to be as well the initial energy of the two particles in the potential well (we assume tha...Since the final state is known to have an energy Qα=4.3 MeV, we will take this energy to be as well the initial energy of the two particles in the potential well (we assume that Qα=E since Q is the kinetic energy while the potential energy is zero).
- https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/12%3A__Nuclear_Physics/12.05%3A_Nuclear_ReactionsEarly experiments revealed three types of nuclear “rays” or radiation: alpha (α) rays, beta (β) rays, and gamma (γ) rays. These three types of radiation are differentiated by their ability to pen...Early experiments revealed three types of nuclear “rays” or radiation: alpha (α) rays, beta (β) rays, and gamma (γ) rays. These three types of radiation are differentiated by their ability to penetrate matter. Alpha radiation is barely able to pass through a thin sheet of paper. Beta radiation can penetrate aluminum to a depth of about 3 mm, and gamma radiation can penetrate lead to a depth of 2 or more centimeters.
- https://phys.libretexts.org/Bookshelves/Modern_Physics/Spiral_Modern_Physics_(D'Alessandris)/7%3A_Nuclear_Physics/7.3%3A_Alpha_and_Beta_DecayIf we can determine the activity of the sample (the number of decays per second), the product of activity and Q will be the power of the sample. The overall energy of the nucleus would be reduced (and...If we can determine the activity of the sample (the number of decays per second), the product of activity and Q will be the power of the sample. The overall energy of the nucleus would be reduced (and its stability increased) if the “stray” neutron at the top of the neutron well could somehow transform itself into a proton and jump down to the lower energy state in the proton well.
- https://phys.libretexts.org/Bookshelves/Modern_Physics/Spiral_Modern_Physics_(D'Alessandris)/7%3A_Nuclear_Physics/7.A%3A_Alpha_Decay_(Project)The radioactive process known as alpha decay involves the tunneling of an alpha particle (a bound state of two protons and two neutrons) through the Coulomb barrier to escape the nuclear potential.
- https://phys.libretexts.org/Bookshelves/University_Physics/University_Physics_(OpenStax)/University_Physics_III_-_Optics_and_Modern_Physics_(OpenStax)/10%3A__Nuclear_Physics/10.05%3A_Nuclear_ReactionsEarly experiments revealed three types of nuclear “rays” or radiation: alpha (α) rays, beta (β) rays, and gamma (γ) rays. These three types of radiation are differentiated by their ability to pen...Early experiments revealed three types of nuclear “rays” or radiation: alpha (α) rays, beta (β) rays, and gamma (γ) rays. These three types of radiation are differentiated by their ability to penetrate matter. Alpha radiation is barely able to pass through a thin sheet of paper. Beta radiation can penetrate aluminum to a depth of about 3 mm, and gamma radiation can penetrate lead to a depth of 2 or more centimeters.
- https://phys.libretexts.org/Courses/Bowdoin_College/Phys1140%3A_Introductory_Physics_II%3A_Part_2/07%3A__Nuclear_Physics/7.05%3A_Nuclear_ReactionsEarly experiments revealed three types of nuclear “rays” or radiation: alpha (α) rays, beta (β) rays, and gamma (γ) rays. These three types of radiation are differentiated by their ability to pen...Early experiments revealed three types of nuclear “rays” or radiation: alpha (α) rays, beta (β) rays, and gamma (γ) rays. These three types of radiation are differentiated by their ability to penetrate matter. Alpha radiation is barely able to pass through a thin sheet of paper. Beta radiation can penetrate aluminum to a depth of about 3 mm, and gamma radiation can penetrate lead to a depth of 2 or more centimeters.
- https://phys.libretexts.org/Bookshelves/Quantum_Mechanics/Quantum_Mechanics_(Fowler)/03%3A_Mostly_1-D_Quantum_Mechanics/3.03%3A_Energy-Time_Uncertainty_PrincipleThe momentum-position uncertainty principle Δp⋅Δx≥ℏ has an energy-time analog, ΔE⋅Δt≥ℏ. Evidently, though, this must be a different kind of relationship to the momentum-position one, because t is no...The momentum-position uncertainty principle Δp⋅Δx≥ℏ has an energy-time analog, ΔE⋅Δt≥ℏ. Evidently, though, this must be a different kind of relationship to the momentum-position one, because t is not a dynamical variable, so this can’t have anything to do with non-commutation. To illustrate the meaning of the equation Δ E⋅Δ t≥ℏ, let us reconsider α-decay,
