Yazar "Lenzi, Silvia M." seçeneğine göre listele

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    High-spin level structure of 35 S
    (American Physical Society, 2014) Aydın, Sezgin; Ionescu-Bujor, M.; Recchia, Francesco; Lenzi, Silvia M.; Bouhelal, Mouna; Bazzacco, Dino B.; Bizzeti, P. G.; Bizzeti-Sona A.M.
    The nucleus 35S has been studied by in-beam ?-ray spectroscopy using the 24Mg(14N,3p) fusion-evaporation reaction at Elab=40 MeV. A level scheme extended up to J?=17/2+ at 8023 keV and J?=13/2- at 6352 keV has been established. Lifetimes of six excited states have been determined by applying the Doppler shift attenuation method. The experimental data have been compared with the results of large-scale shell model calculations performed using different effective interactions and model spaces allowing particle-hole excitations across the N=Z=20 shell gap. © 2014 American Physical Society.
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    High-spin states and lifetimes in S-33 and shell-model interpretation in the sd-fp space
    (American Physical Society, 2017) Aydın, Sezgin; Ionescu-Bujor, M.; Gavrilov, G. Tz.; Dimitrov, B. I.; Lenzi, Silvia M.; Recchia, Francesco; Tonev, Dimitar; Bouhelal, Mouna; Kavillioglu, F.; Pavlov, P.; Bazzacco, D.; Bizzeti, P. G.; Bizzeti-Sona, A. M.; de Angelis, G.; Deloncle, I.; Farnea, E.; Gadea, A.; Gottardo, A.; Goutev, N.; Haas, F.; Huyuk, T.; Laftchiev, H.; Lunardi, S.; Marinov, Tz. K.; Mengoni, D.; Menegazzo, R.; Michelagnoli, C.; Napoli, D. R.; Petkov, P.; Sahin, E.; Singh, P. P.; Stefanova, E. A.; Ur, C. A.; Valiente-Dobon, J. J.; Yavahchova, M. S.
    The structure of the S-33 nucleus was investigated in the Mg-24(N-14, alpha p) fusion-evaporation reaction using a 40-MeV N-14 beam. The level scheme was extended up to an excitation energy of 11.7 MeV and spin 19/2+. Lifetimes of the intermediate-and high-spin states have been investigated by the Doppler shift attenuation method. Data were compared with different shell-model calculations where effective interactions involving two main shells, the sd and the fp, are used.
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    High-spin structure and intruder excitations in Cl-36
    (American Physical Society, 2012) Aydın, Sezgin; Recchia, Francesco; Ionescu-Bujor, M.; Gadea, Andrés; Lenzi, Silvia M.; Lunardi, Santo; Ur, Calin Alexandru; Bazzacco, Dino B.; Bizzeti, P. G.; Bizzeti-Sona, A. M.; Bouhelal, M.; de Angelis, G.; Deloncle, I.; Farnea, E.; Gottardo, A.; Haas, F.; Huyuk, T.; Laftchiev, H.; Mengoni, D.; Menegazzo, R.; Michelagnoli, C.; Napoli, D. R.; Sahin, E.; Singh, P. P.; Tonev, D.; Valiente-Dobon, J. J.
    Excited states up to J(pi) = 11(-) at 10 296 keV and J(pi) = 10(+) at 10 707 keV have been populated in the odd-odd Cl-36 nucleus using the Mg-24(N-14,2p) fusion-evaporation reaction at E-lab = 31 MeV. Twenty new states and 62 new gamma transitions have been identified by employing gamma-gamma and gamma-gamma-gamma coincidences. Lifetimes have been investigated by the Doppler shift attenuation method. The experimental data have been compared with the results of large-scale shell-model calculations performed using different effective interactions and model spaces allowing particle-hole excitations across the N = Z = 20 shell gap.
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    Neutron Skin Effects in Mirror Energy Differences: The Case of Mg-23-Na-23
    (American Physical Society, 2018) Boso, A.; Lenzi, Silvia M.; Recchia, Francesco; Bonnard, Jèrèmy; Zuker, Andrés P.; Aydın, Sezgin; Bentley, M. A.; Cederwall, Bo
    Energy differences between analogue states in the T = 1/2 Mg-23-Na-23 mirror nuclei have been measured along the rotational yrast bands. This allows us to search for effects arising from isospin-symmetrybreaking interactions (ISB) and/or shape changes. Data are interpreted in the shell model framework following the method successfully applied to nuclei in the f(7/2) shell. It is shown that the introduction of a schematic ISB interaction of the same type of that used in the f(7/2) shell is needed to reproduce the data. An alternative novel description, applied here for the first time, relies on the use of an effective interaction deduced from a realistic charge-dependent chiral nucleon-nucleon potential. This analysis provides two important results: (i) The mirror energy differences give direct insight into the nuclear skin; (ii) the skin changes along the rotational bands are strongly correlated with the difference between the neutron and proton occupations of the s(1/2) "halo" orbit.
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    Spectroscopy of odd-mass cobalt isotopes toward the N = 40 subshell closure and shell-model description of spherical and deformed states
    (American Physical Society, 2012) Recchia, Francesco; Lenzi, Silvia M.; Lunardi, Santo; Farnea, Enrico; Gadea, Andrés; Mârginean, Nicolae Marius; Napoli, Daniel Ricardo; Aydın, Sezgin
    The neutron-rich cobalt isotopes up to A=67 have been studied through multinucleon transfer reactions by bombarding a 238U target with a 460-MeV 70Zn beam. Unambiguous identification of prompt ? rays belonging to each nucleus has been achieved using coincidence relationships with the ions detected in a high-acceptance magnetic spectrometer. The new data are discussed in terms of the systematics of the cobalt isotopes and interpreted with large-scale shell-model calculations in the fpgd model space. In particular, very different shapes can be described in 67Co, at the edge of the island of inversion at N=40, where a low-lying highly deformed band coexists with a spherical structure.