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2021-07-29

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/215348

Reexamination of the N=50 and Z=28 shell closure

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https://doi.org/10.1103/PhysRevC.104.L011302

Resum

Recent experiments performed in neutron-rich copper isotopes have revealed a crossing in the nucleus 75Cu between the 3/2− and 5/2− levels, which correspond to the ground state and the first excited state in isotopes with mass number below 𝐴=75. Due to the strong single-particle character of these states, this scenario can be investigated through the analysis of the proton spectrum provided by mean-field models in nickel isotopes with neutron numbers between 𝑁=40 and 𝑁=50. In this work, we show that the aforementioned crossing is mainly driven by the mean field provided by the effective nucleon-nucleon and spin-orbit interactions. We also analyze the impact of the tensor interaction and find that in some mean-field models it is essential to reproduce the crossing of the 2⁢𝑝3/2 and 1⁢𝑓5/2 proton single-particle levels, as in the case of the SAMi-T Skyrme force and the D1M Gogny interaction, whereas in other cases, as for example the SLy5 Skyrme force, a reasonable tensor force appears to be unable to modify the mean-field enough to reproduce this level crossing. Finally, in the calculations performed with the so-called simple effective interaction (SEI), it is shown that the experimental data in nickel and copper isotopes considered in this work can be explained satisfactorily without any explicit consideration of the tensor interaction.

Matèries

Forces nuclears (Física), Estructura nuclear

Matèries (anglès)

Nuclear forces (Physics), Nuclear structure

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Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

Citació

ROUTRAY, T. r., BANO, P., ANGUIANO, M., CENTELLES AIXALÀ, Mario, VIÑAS GAUSÍ, Xavier, ROBLEDO, Luis m.. Reexamination of the N=50 and Z=28 shell closure. _Physical Review C_. 2021. Vol. C104, núm. 1-5. [consulta: 21 de gener de 2026]. ISSN: 2469-9985. [Disponible a: https://hdl.handle.net/2445/215348]

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