High temperature giant dipole and isoscalar resonances

Garcías, F.; Barranco, M.; Navarro, J.; Suraud, E.

doi:10.1007/bf01289692

Cited by 3 publications

(2 citation statements)

References 29 publications

(41 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(i) The centroid energy, E GDR = 13.5 MeV, is in agreement with the ground-state value E GDR,gs within 4% and consistent with previous experimental results and theoretical predictions[59][60][61][62]. (ii) The width, GDR = 11.6 MeV, increases with the nuclear temperature and/or the excitation energy, if compared with the results obtained for Pb isotopes: 9 MeV at T = 1.5 MeV and similar spin distribution[39] and 8 MeV at T ∼ 1.6 MeV and much lower average spin[42].…”

supporting

confidence: 90%

Evidence of dynamical dipole excitation in the fusion-evaporation of theCa40+Sm152heavy system

Parascandolo¹,

Pierroutsakou²,

Alba³

et al. 2016

Phys. Rev. C

View full text Add to dashboard Cite

The excitation of the dynamical dipole mode along the fusion path was investigated for the first time in the formation of a heavy compound nucleus in the A ∼ 190 mass region. The compound nucleus was formed at identical conditions of excitation energy and spin from two entrance channels: the charge-asymmetric 40 Ca + 152 Sm and the nearly charge-symmetric 48 Ca + 144 Sm at E lab = 11 and 10.1 MeV/nucleon, respectively. High-energy γ rays and light charged particles were measured in coincidence with evaporation residues by means of the MEDEA multidetector array (Laboratori Nazionali del Sud, Italy) coupled to four parallel plate avalanche counters. The charged particle multiplicity spectra and angular distributions were used to pin down the average excitation energy, the average mass, and the average charge of the compound nucleus. The γ -ray multiplicity spectrum and angular distribution related to the nearly charge-symmetric channel were employed to obtain new data on the giant dipole resonance in the compound nucleus. The dynamical dipole mode excitation in the charge-asymmetric channel was evidenced, in a model-independent way, by comparing the γ -ray multiplicity spectra and angular distributions of the two entrance channels with each other. Calculations of the dynamical dipole mode in the 40 Ca + 152 Sm channel, based on a collective bremsstrahlung analysis of the reaction dynamics, are presented. Possible interesting implications in the superheavy-element quest are discussed.

show abstract