Matches in SemOpenAlex for { <https://semopenalex.org/work/W2290806809> ?p ?o ?g. }
- W2290806809 abstract "Isovector and isoscalar dipole excitations in $^{9}mathrm{Be}$ and $^{10}mathrm{Be}$ are investigated in the framework of antisymmetrized molecular dynamics, in which angular-momentum and parity projections are performed. In the present method, 1p-1h excitation modes built on the ground state and a large amplitude $ensuremath{alpha}$-cluster mode are taken into account. The isovector giant dipole resonance (GDR) in $E>20$ MeV shows the two-peak structure, which is understood from the dipole excitation in the $2ensuremath{alpha}$ core part with the prolate deformation. Because of valence neutron modes against the $2ensuremath{alpha}$ core, low-energy $E1$ resonances appear in $E<20$ MeV, exhausting about $20%$ of the Thomas-Reiche-Kuhn sum rule and $10%$ of the calculated energy-weighted sum. The dipole resonance at $Eensuremath{sim}15$ MeV in $^{10}mathrm{Be}$ can be interpreted as the parity partner of the ground state having a $^{6}mathrm{He}phantom{rule{0.16em}{0ex}}+phantom{rule{0.16em}{0ex}}ensuremath{alpha}$ structure and has remarkable $E1$ strength because of the coherent contribution of two valence neutrons. The isoscalar dipole strength for some low-energy resonances is significantly enhanced by the coupling with the $ensuremath{alpha}$-cluster mode. For the $E1$ strength of $^{9}mathrm{Be}$, the calculation overestimates the energy-weighted sum (EWS) in the low-energy ($E<20$ MeV) and GDR ($20<E<50$ MeV) regions by a factor of 1.6 and underestimates the width of the GDR, whereas it reasonably describes the GDR energy and also the ratio of the EWS in the low-energy region to that of the GDR region." @default.
- W2290806809 created "2016-06-24" @default.
- W2290806809 creator A5007955164 @default.
- W2290806809 date "2016-02-29" @default.
- W2290806809 modified "2023-10-16" @default.
- W2290806809 title "Isovector and isoscalar dipole excitations inBe9andBe10studied with antisymmetrized molecular dynamics" @default.
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