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Super strong nuclear force caused by migrating K̄ mesons - Revival of the Heitler-London-Heisenberg scheme in kaonic nuclear clusters.

Yamazaki T, Akaishi Y - Proc. Jpn. Acad., Ser. B, Phys. Biol. Sci. (2007)

Bottom Line: The structure of K (-) pp reveals a molecular feature, namely, the K (-) in Λ (*) as an "atomic center" plays a key role in producing strong covalent bonding with the other proton.We point out that strongly bound K̄ nuclear systems are formed by "super strong" nuclear force due to migrating real bosonic particles K̄ a la Heitler-London-Heisenberg, whereas the normal nuclear force is caused by mediating virtual mesons.We have shown that the elementary process, p + p → K (+) + Λ (*) + p, which occurs in a short impact parameter and with a large momentum transfer, leads to unusually large self-trapping of Λ (*) by the involved proton, since the Λ (*)-p system exists as a compact doorway state propagating to K (-) pp.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, University of Tokyo, Tokyo, Japan . ; RIKEN Nishina Center, Saitama, Japan .

ABSTRACT
We have studied the structure of K (-) pp comprehensively by solving this threebody system in a variational method, starting from the Ansatz that the Λ(1405) resonance (≡Λ (*)) is a K (-) p bound state. The structure of K (-) pp reveals a molecular feature, namely, the K (-) in Λ (*) as an "atomic center" plays a key role in producing strong covalent bonding with the other proton. We point out that strongly bound K̄ nuclear systems are formed by "super strong" nuclear force due to migrating real bosonic particles K̄ a la Heitler-London-Heisenberg, whereas the normal nuclear force is caused by mediating virtual mesons. We have shown that the elementary process, p + p → K (+) + Λ (*) + p, which occurs in a short impact parameter and with a large momentum transfer, leads to unusually large self-trapping of Λ (*) by the involved proton, since the Λ (*)-p system exists as a compact doorway state propagating to K (-) pp.

No MeSH data available.


(Left) The adiabatic potential (V (R)R2), when a proton approaches a bound K−p “atom” (Λ*), as a function of the distance between p and p. The Tamagaki potential for the normal VNN interaction is shown for comparison. (Right) The molecular structure of K−pp. The projected density distributions of K− in K−pp with a fixed p-p distance (= 2.0 fm) and the corresponding K− contour distribution are shown.
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f2-83_144: (Left) The adiabatic potential (V (R)R2), when a proton approaches a bound K−p “atom” (Λ*), as a function of the distance between p and p. The Tamagaki potential for the normal VNN interaction is shown for comparison. (Right) The molecular structure of K−pp. The projected density distributions of K− in K−pp with a fixed p-p distance (= 2.0 fm) and the corresponding K− contour distribution are shown.

Mentions: The present kaonic nuclear cluster K−pp can be interpreted as a kaonic hydrogen molecular ion in the sense that K− migrates between the two protons, producing “strong covalency” through the strongly attractive K̄NI=0 interaction. This is essentially the mechanism of Heitler and London2) for the hydrogen molecule, though the nature of the interaction is totally different and the migrating particle is much heavier and bosonic. Figure 2 (Left) shows the adiabatic potential (V (R)R2), when a proton approaches a Λ(1405) particle, as a function of the p-p distance. The deep potential indicates that a proton approaching an isolated Λ* from a large distance becomes quickly trapped and dissolved into the bound state of K−pp.


Super strong nuclear force caused by migrating K̄ mesons - Revival of the Heitler-London-Heisenberg scheme in kaonic nuclear clusters.

Yamazaki T, Akaishi Y - Proc. Jpn. Acad., Ser. B, Phys. Biol. Sci. (2007)

(Left) The adiabatic potential (V (R)R2), when a proton approaches a bound K−p “atom” (Λ*), as a function of the distance between p and p. The Tamagaki potential for the normal VNN interaction is shown for comparison. (Right) The molecular structure of K−pp. The projected density distributions of K− in K−pp with a fixed p-p distance (= 2.0 fm) and the corresponding K− contour distribution are shown.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3756877&req=5

f2-83_144: (Left) The adiabatic potential (V (R)R2), when a proton approaches a bound K−p “atom” (Λ*), as a function of the distance between p and p. The Tamagaki potential for the normal VNN interaction is shown for comparison. (Right) The molecular structure of K−pp. The projected density distributions of K− in K−pp with a fixed p-p distance (= 2.0 fm) and the corresponding K− contour distribution are shown.
Mentions: The present kaonic nuclear cluster K−pp can be interpreted as a kaonic hydrogen molecular ion in the sense that K− migrates between the two protons, producing “strong covalency” through the strongly attractive K̄NI=0 interaction. This is essentially the mechanism of Heitler and London2) for the hydrogen molecule, though the nature of the interaction is totally different and the migrating particle is much heavier and bosonic. Figure 2 (Left) shows the adiabatic potential (V (R)R2), when a proton approaches a Λ(1405) particle, as a function of the p-p distance. The deep potential indicates that a proton approaching an isolated Λ* from a large distance becomes quickly trapped and dissolved into the bound state of K−pp.

Bottom Line: The structure of K (-) pp reveals a molecular feature, namely, the K (-) in Λ (*) as an "atomic center" plays a key role in producing strong covalent bonding with the other proton.We point out that strongly bound K̄ nuclear systems are formed by "super strong" nuclear force due to migrating real bosonic particles K̄ a la Heitler-London-Heisenberg, whereas the normal nuclear force is caused by mediating virtual mesons.We have shown that the elementary process, p + p → K (+) + Λ (*) + p, which occurs in a short impact parameter and with a large momentum transfer, leads to unusually large self-trapping of Λ (*) by the involved proton, since the Λ (*)-p system exists as a compact doorway state propagating to K (-) pp.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, University of Tokyo, Tokyo, Japan . ; RIKEN Nishina Center, Saitama, Japan .

ABSTRACT
We have studied the structure of K (-) pp comprehensively by solving this threebody system in a variational method, starting from the Ansatz that the Λ(1405) resonance (≡Λ (*)) is a K (-) p bound state. The structure of K (-) pp reveals a molecular feature, namely, the K (-) in Λ (*) as an "atomic center" plays a key role in producing strong covalent bonding with the other proton. We point out that strongly bound K̄ nuclear systems are formed by "super strong" nuclear force due to migrating real bosonic particles K̄ a la Heitler-London-Heisenberg, whereas the normal nuclear force is caused by mediating virtual mesons. We have shown that the elementary process, p + p → K (+) + Λ (*) + p, which occurs in a short impact parameter and with a large momentum transfer, leads to unusually large self-trapping of Λ (*) by the involved proton, since the Λ (*)-p system exists as a compact doorway state propagating to K (-) pp.

No MeSH data available.