Quantum time scales in alpha tunneling

Abstract

The theoretical treatment of alpha decay by Gamow is revisited by investigating the quantum time scales in tunneling. The time spent by an alpha particle in front of the barrier and traversing it before escape is evaluated using microscopic alpha nucleus potentials. The half-life of a nucleus is shown to correspond to the time spent by the alpha knocking in front of the barrier. Calculations for medium and super heavy nuclei show that from a multitude of available tunneling time definitions, the transmission dwell time gives the bulk of the lifetime of the decaying state, in most cases.

LaTex, 1 figure, new comments and references added

References in corpus (12)

• alpha-nucleus potentials, alpha-decay half-lives, and shell closures for superheavy nuclei
• Critical view of WKB decay widths
• Systematics of proton emission
• Evidence for Symplectic Symmetry in Ab Initio No-Core Shell Model Results for Light Nuclei
• Modified two-potential approach to tunneling problems
• Microscopic calculation of half lives of spherical proton emitters
• Super-allowed alpha-decay above doubly-magic 100Sn and properties of 104Te = 100Sn otimes alpha
• Quantum reflection and dwell times of metastable states
• Nuclear Structure Calculations and Modern Nucleon-Nucleon Potentials
• Roles of proton-neutron interactions in alpha-like four-nucleon correlations
• Shell-model study of spectroscopies and isospin structures in odd-odd $N=Z$ nuclei employing realistic \emph{NN} potentials
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Cited by in corpus (18)

• Timescales of tunneling decay of a localized state
• Salecker-Wigner-Peres clock and average tunneling times
• Critical view of nonlocal nuclear potentials in alpha decay
• Signature of the N=126 shell closure in dwell times of alpha-particle tunneling
• Pairing gaps and Fermi energies at scission for 296Lv alpha-decay
• Dynamically Assisted Tunneling in the Floquet Picture
• Weak value of Dwell time for Quantum Dissipative spin-1/2 System
• Different manifestations of S-matrix poles
• Time in dissipative tunneling: subtleties and applications
• Spin dynamics in tunneling decay of a metastable state
• Tunneling times and bremsstrahlung in alpha decay
• Gravitational Collapse via Wheeler-DeWitt Equation
• Interference effects in tunnelling of "cat" wave packet states
• Wheeler-DeWitt equation and the late gravitational collapse: effects of factor ordering and the tunneling scenario
• Electron interaction with the environment in tunnel ionization
• Dynamically assisted tunneling in the impulse regime
• Quantum Gravity Corrections to the Mean Field Theory of Nucleons
• Three body dwell time