10,482 research outputs found
Two-Proton Radioactivity with 2p halo in light mass nuclei A1834
Two-proton radioactivity with 2p halo is reported theoretically in light mass
nuclei A 18-34. We predict Mg, Si, S, Ar and
Ca as promising candidates of ground state 2p-radioactivity with
S 0. Observation of extended tail of spatial
charge density distribution, larger charge radius and study of proton single
particle states, Fermi energy and the wave functions indicate 2p halo like
structure which supports direct 2p emission. The Coulomb and centrifugal
barriers in experimentally identified 2p unbound Si show a quasi-bound
state that ensures enough life time for such experimental probes. Our
predictions are in good accord with experimental and other theoretical data
available so far.Comment: 5 Pages, 5 figure
Two photon annihilation operators and squeezed vacuum
Inverses of the harmonic oscillator creation and annihilation operators by their actions on the number states are introduced. Three of the two photon annihilation operators, viz., a(sup +/-1)a, aa(sup +/-1), and a(sup 2), have normalizable right eigenstates with nonvanishing eigenvalues. The eigenvalue equation of these operators are discussed and their normalized eigenstates are obtained. The Fock state representation in each case separates into two sets of states, one involving only the even number states while the other involving only the odd number states. It is shown that the even set of eigenstates of the operator a(sup +/-1)a is the customary squeezed vacuum S(sigma) O greater than
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