Investigation of low-lying electric dipole strength in the semimagic nucleusCa44

Systematic investigation of low-lying dipole modes using the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory

“…The low-energy dipole states have been observed in a number of nuclei: neutron-rich O isotopes [1,2], 26 Ne [3], stable Ca isotopes [4,5], 56 Fe and 58 Ni [6], 68 Ni [7], 88 Sr [8], 90 Zr [9,10], Sn isotopes [11][12][13][14][15], N = 82 isotones [16][17][18][19][20][21], and stable Pb isotopes [22][23][24][25][26]. The observed low-energy E1 strength exhausts less than 1% of the Thomas-Reiche-Kuhn (TRK) sum-rule value in stable isotopes, while it may amount up to about 5% in neutron-rich nuclei.…”

Decay of quadrupole-octupole1−states inCa40andCe140Derya1, Tsoneva2, Aumann3 et al. 2016Phys. Rev. CSelf Cite12120View full textAdd to dashboardCite

“…Low-lying E1 excitations have been studied systematically in 40 Ca, 44 Ca, and 48 Ca by means of NRF experiments [14,63,[75][76][77]. The doubly-magic N = Z nucleus 40 Ca exhibits almost no low-lying E1 strength, whereas 44 Ca and 48 Ca exhaust more and a similar amount of the Thomas-Reiche-Kuhn energy-weighted sum rule [76,77].…”

Dipole response in neutron-rich nuclei within self-consistent approaches using realistic potentials

“…Hence the need of adding the density dependent term V ρ , though with a weaker strength. We used for all nuclei of all regions the coupling constant C ρ ∼ 1000 MeV fm 6 , four times smaller than the V ρ strength (C ρ ∼ 4200 MeV fm 6 ) used in the case of V lowk [20]. By using the potential so corrected, we get a fair agreement between theoretical and experimental cross sections (Fig.…”

“…In stable nuclei, dense discrete spectra of dipole states were detected in (γ, γ ) [3][4][5][6][7][8][9] and in (α, α γ) experiments [10][11][12]. Moreover, fairly complete dipole spectra below and above the neutron decay threshold were produced with great accuracy through inelastic proton scattering experiments [13,14].…”