2021/10/08 by S. Călinescu, S. Calinescu, Calinescu, S. +116
Physics and Astronomy · #Atomic physics #Beam (structure) #Beam energy #Coulomb #Coulomb excitation #Energy (signal processing) #Excitation #Excited state #Nuclear Physics and Applications #Nuclear physics #Nuclear physics research studies #Nuclear reaction #Oblate spheroid #Optics #Physics #Prolate spheroid #Quantum mechanics #Spectral line #X-ray Spectroscopy and Fluorescence Analysis #nucl-ex #nucl-th
paper · pdf · doi:10.48550/arxiv.2110.03932
arxiv created 2021/10/08 · openalex publication_date 2021/10/08 · arxiv updated 2021/10/11 · openalex created_date 2021/10/25 · openalex updated_date 2026/08/05
The reduced transition probabilities B(E2; 0+g.s.→21+,2+2) in 70Zn and the full B(E2; 0+g.s.→2+) strength up to Sn=7.79 MeV in 68Ni have been determined at the LISE/GANIL facility using the Coulomb-excitation technique at intermediate beam energy on a 208Pb target. The γ rays emitted in-flight were detected with an array of 46 BaF2 crystals. The angles of the deflected nuclei were determined in order to disentangle and extract the Coulomb and nuclear contributions to the excitation of the 2+ states. The measured B(E2; 0+g.s.→21+) of 1432(124) e2fm4 for 70Zn falls in the lower part of the published values which clustered either around 1600 or above 2000 e2fm4, while the B(E2; 0+g.s.→2+2) of 53(7) e2fm4 agrees very well with the two published values. The relatively low B(E2; 0+g.s.→21+) of 301(38) e2fm4 for 68Ni agrees with previous studies and confirms a local magicity at Z=28, N=40. Combining the results of the low-energy spectra of 68Ni and 70Zn and their shell-model interpretations, it is interesting to notice that four different shapes (spherical, oblate, prolate and triaxial) are present. Finally, a summed E2 strength of only about 150 e2fm4 has been found experimentally at high excitation energy, likely due to proton excitations across the Z=28 gap. The experimental distribution of this high-energy E2 excitation agrees with SM calculations, but its strength is about two times weaker.