Pygmy dipole strength in86Kr and systematics ofN=50isotones

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

“…142 Nd, and 144 Sm in the framework of a more advanced microscopic nuclear structure approach based on the self-consistent energy-density functional (EDF) theory and QPM including up to three-phonon configurations [18,19]. The theoretical method has been widely tested in systematic studies of electric and magnetic excitations from different energy and mass regions [4,8,10,12,16,17,65] and also in predictions of new modes of nuclear excitations related to the pygmy quadrupole resonance (PQR) [66][67][68]. A further advantage of the three-phonon EDF+QPM calculations is that we consider explicitly all one-phonon configurations up to the neutron threshold including explicitly the PDR.…”

“…In a simple macroscopic picture, a displacement of center-of-mass and center-ofcharge of the nucleus generates a vibrational motion trying to restore the proton-neutron symmetry. Nowadays, the rapidly increasing number of experiments using different probes and techniques allow for systematic studies of the PDR over isotopic and isotonic chains from different mass regions [4,[7][8][9][10][11][12][13][14][15][16][17]. A close connection between * derya@ikp.uni-koeln.de the total PDR strength and the amount of the neutron excess of neutron-rich nuclei which on the other hand is correlated with the neutron skin thickness was proposed [6,[18][19][20].…”

Pygmy resonances and radiative nucleon captures for stellar nucleosynthesis

“…The PDR appears as an additional dipole strength component around the neutron threshold sitting on top of the low-energy tail of the giant dipole resonance (GDR) classically represented by a Lorentzian shape [14][15][16]. This phenomenon is found to be a common feature in stable and unstable neutron-rich nuclei.…”

“…The PDR states are understood as oscillations of weakly bound neutrons from the Fermi surface with respect to the isospin-symmetric nuclear core [17,18]. From systematic studies of nuclear isotonic and isotopic chains, a correlation of total PDR strengths and nuclear skin thickness was found [15,16,[18][19][20]. Furthermore, the detailed analysis of pygmy dipole strengths in N = 50 isotones [16] shows that standard strength functions based on Lorentz curves currently used for the calculation of cross sections in statistical reaction model codes do not describe the dipole strength distribution below the (γ,n) threshold correctly and need to be improved.…”

Cross-Section Measurements of theKr86(γ,n)Reaction to Probe thes-Process Branching atRaut1, Tonchev2, Rusev3 et al. 2013Phys. Rev. Lett.Self Cite593330View full textAdd to dashboardCite

“…The corresponding uncertainty at these low temperatures are believed to remain low with respect to those associated with the experimental errors on the (γ, γ ′ ) strength and the nuclear level densities. Furthermore, a dipole strength function from three-phonon QPM calculations + QRPA, which has successfully described the fragmentation pattern of the E1 strength below the neutron threshold of 86 Kr and the related pygmy dipole resonance [17], was implemented in the TALYS code. These results are also shown in Fig.…”