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Электронный каталог: Efimov, A. D. - The Harris Model and IBM for Pu, Cm, Fm, and No
Efimov, A. D. - The Harris Model and IBM for Pu, Cm, Fm, and No
Статья
Автор: Efimov, A. D.
Nuclear Physics A: The Harris Model and IBM for Pu, Cm, Fm, and No
б.г.
ISBN отсутствует
Автор: Efimov, A. D.
Nuclear Physics A: The Harris Model and IBM for Pu, Cm, Fm, and No
б.г.
ISBN отсутствует
На полку
Статья
Efimov, A.D.
The Harris Model and IBM for Pu, Cm, Fm, and No / A.D.Efimov, I.V.Koval, I.N.Izosimov. – Text : electronic // Nuclear Physics A. – 2026. – Vol. 1070. – P. 123370. – URL: https://doi.org/10.1016/j.nuclphysa.2026.123370. – Bibliogr.: 38.
Background: Long rotational bands in most even-even Pu, Cm, Fm, and No nuclei largely retain their collective nature. Purpose: This work investigates the evolution of collective-state energies to the highest known spins including observed back-up-down-bending effects. Methods: Ground-band energies are calculated using the phenomenological Harris model with a variable moment of inertia and the interacting boson model (IBM) in its phenomenological formulation, extending the total boson number *Q to 36. For selected nuclei, results from an extended IBM version with parameters derived microscopically from a phononic representation of excitation modes are also presented. Results: Systematic yrast-band calculations are presented for even-even nuclei &sup(236−246)Pu, &sup(242,246,248)Cm, &sup(248,250)Fm, and &sup(252,254)No. The downbending effect is reproduced for &sup(242)Cm. Explicit inclusion of two-quasiparticle excitations is required to describe &sup(248)Cm, &sup(238−244)Pu, &sup(250)Fm, and &sup(252)No. A substantial increase in *Q within the IBM successfully reproduces yrast-band energies up to the highest observed spins in &sup(236)Pu, &sup(246)Cm, and &sup(254)No. Conclusions: The observed downbending is explained by the spin-dependent boson-space size, a feature inherent to the IBM framework. This analysis provides estimates for optimal *Q values and non-collective admixtures at high spins, offering valuable input for microscopic calculations of yrast-band properties in these nuclei.
Спец.(статьи,препринты) = С 341 а - Различные модели ядер$
Спец.(статьи,препринты) = С 341.2в1 - Изомеры и метастабильные состояния. Высокоспиновые состояния
ОИЯИ = ОИЯИ (JINR)2026
Бюллетени = 28/026
Efimov, A.D.
The Harris Model and IBM for Pu, Cm, Fm, and No / A.D.Efimov, I.V.Koval, I.N.Izosimov. – Text : electronic // Nuclear Physics A. – 2026. – Vol. 1070. – P. 123370. – URL: https://doi.org/10.1016/j.nuclphysa.2026.123370. – Bibliogr.: 38.
Background: Long rotational bands in most even-even Pu, Cm, Fm, and No nuclei largely retain their collective nature. Purpose: This work investigates the evolution of collective-state energies to the highest known spins including observed back-up-down-bending effects. Methods: Ground-band energies are calculated using the phenomenological Harris model with a variable moment of inertia and the interacting boson model (IBM) in its phenomenological formulation, extending the total boson number *Q to 36. For selected nuclei, results from an extended IBM version with parameters derived microscopically from a phononic representation of excitation modes are also presented. Results: Systematic yrast-band calculations are presented for even-even nuclei &sup(236−246)Pu, &sup(242,246,248)Cm, &sup(248,250)Fm, and &sup(252,254)No. The downbending effect is reproduced for &sup(242)Cm. Explicit inclusion of two-quasiparticle excitations is required to describe &sup(248)Cm, &sup(238−244)Pu, &sup(250)Fm, and &sup(252)No. A substantial increase in *Q within the IBM successfully reproduces yrast-band energies up to the highest observed spins in &sup(236)Pu, &sup(246)Cm, and &sup(254)No. Conclusions: The observed downbending is explained by the spin-dependent boson-space size, a feature inherent to the IBM framework. This analysis provides estimates for optimal *Q values and non-collective admixtures at high spins, offering valuable input for microscopic calculations of yrast-band properties in these nuclei.
Спец.(статьи,препринты) = С 341 а - Различные модели ядер$
Спец.(статьи,препринты) = С 341.2в1 - Изомеры и метастабильные состояния. Высокоспиновые состояния
ОИЯИ = ОИЯИ (JINR)2026
Бюллетени = 28/026
