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NSR database version of April 27, 2024.

Search: Author = O.Andrei

Found 6 matches.

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2022MI15      Phys.Rev. C 106, 024332 (2022)

R.E.Mihai, A.S.Mare, N.Marginean, A.Petrovici, O.Andrei, M.Boromiza, D.Bucurescu, G.Cata-Danil, C.Clisu, C.Costache, I.Dinescu, D.Filipescu, N.Florea, I.Gheorghe, A.Ionescu, R.Lica, R.Marginean, C.Mihai, A.Mitu, A.Negret, C.R.Nita, A.Olacel, A.Oprea, S.Pascu, A.Serban, C.Sotty, L.Stan, R.Suvaila, S.Toma, A.Turturica, S.Ujeniuc, C.A.Ur

Search for isospin-symmetry breaking in the A=62 isovector triplet

NUCLEAR REACTIONS 58Ni(6Li, 2n)62Ga, E=22 MeV; measured Eγ, Iγ, nγ-coin, (2n)γ-coin, γ(θ) using ROSPHERE array with ten Compton-suppressed HPGe detectors and 11 LaBr3(Ce) detectors for γ rays, and two liquid scintillator neutron detector walls with 12 detectors each neutrons at the IFIN-HH 9-MV Tandem accelerator. 62Ga; deduced levels, J, π, first 2+ state, multipolarities. Comparison with beyond-mean-field complex excited Vampir variational model. Discussed Coulomb energy differences (CED), mirror energy differences (MED), triplet energy differences (TED) for A=62 triplet. 59Ni, 62Cu, 62Zn; observed γ rays.

NUCLEAR STRUCTURE 62Ge, 62Ga, 62Zn; calculated energies of low-lying 0+, 2+ and 4+ analog states, B(E2) for 62Zn, superallowed Fermi β decay strength distribution from 62Ga decay to 62Ge g.s., and compared with available experimental values.

doi: 10.1103/PhysRevC.106.024332
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2019PE11      Phys.Rev. C 100, 015810 (2019)

A.Petrovici, A.S.Mare, O.Andrei, B.S.Meyer

Impact of 68Se and 72Kr stellar weak interaction rates on rp-process nucleosynthesis and energetics

RADIOACTIVITY 68Se, 72Kr(β+), (EC); calculated stellar weak interaction rates of ground state and low-lying excited states using the beyond-mean-field complex excited Vampir model. Discussed impact on rp-process nucleosynthesis in type-I x-ray bursts and energetics.

doi: 10.1103/PhysRevC.100.015810
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2018PE13      Phys.Scr. 93, 114001 (2018)

A.Petrovici, O.Andrei, A.Chilug

Exotic phenomena in medium mass N ∼ Z nuclei within the beyond-mean-field approach

NUCLEAR STRUCTURE 70Se, 70Br, 70,74Kr, 74Rb, 74Sr; analyzed available data; deduced spectroscopic quadrupole moments of 1+ Gamow–Teller daughter states, shape coexistence, J, π. Comparison with the beyond-mean-field complex Excited Vampir model calculations.

doi: 10.1088/1402-4896/aadec5
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2015PE13      Eur.Phys.J. A 51, 133 (2015)

A.Petrovici, O.Andrei

Stellar weak interaction rates and shape coexistence for 68Se and 72Kr waiting points

RADIOACTIVITY 68Se, 72Kr(β+), (EC); calculated β-decay GT strength distribution, cumulative strength for specified decays, decay rates, T1/2 vs temperature, spectroscopic quadrupole moments of discrete states of daughter nuclei using complex Excited Vampir model with different interactions.

doi: 10.1140/epja/i2015-15133-9
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2015PE16      Phys.Rev. C 92, 064305 (2015)

A.Petrovici, O.Andrei

Weak interaction rates and shape coexistence for the Z = N + 2 isotopes 70Kr and 74Sr

RADIOACTIVITY 70Kr, 74Sr(EC), (β+); calculated Gamow-Teller accumulated strengths for the decay of the ground state, first excited 0+, and yrast 2+ state, Fermi β-decay rates for the ground state and yrast 2+ state, and half-lives of 70Kr and 74Sr as a function of density and temperature of T9=1-10. Beyond-mean-field complex excited Vampir variational model with an interaction from a G matrix based on Bonn CD potential. Shape mixing on weak interaction rates. Relevance to decay half-lives in x-ray burst astrophysical environment.

NUCLEAR MOMENTS 70Br, 74Rb; calculated spectroscopic quadrupole moments for 1+ and 3+ Gamow-Teller states populated in β+, ϵ decay of 70Kr and 74Sr using complex excited Vampir model.

doi: 10.1103/PhysRevC.92.064305
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2009PE20      Phys.Rev. C 80, 044319 (2009)

A.Petrovici, K.W.Schmid, O.Andrei, A.Faessler

Variational approach to the Gamow-Teller β decay of the rp-process waiting point nucleus 68Se going beyond mean field calculations

RADIOACTIVITY 68Se(β+), (EC); calculated B(GT) strength distributions, accumulated B(GT) strengths, half-lives, and configuration mixing of lowest 0+ parent states of 68Se using VAMPIR variational approach. Comparison with experimental data.

NUCLEAR STRUCTURE 68As; calculated configuration mixing of lowest 1+ states with significant B(GT) strengths and spectroscopic quadrupole moments using VAMPIR variational approach with Bonn A and Bonn CD potentials.

doi: 10.1103/PhysRevC.80.044319
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