Spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">Se</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>76</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>: Prolate-to-oblate shape transition

Xu, Cheng; Li, X. Q.; Meng, J.; Zhang, S. Q.; Hua, H.; Wang, S. Y.; Qi, B.; Liu, C.; Zhang, Xiao; Li, H. J.; Zhu, Lihua; Shi, Z.; Li, Z. H.; Ye, Y. L.; Jiang, D. X.; Sun, Junjie; Zhang, Z. H.; Shi, Yue; Zhao, P. W.; Chen, Q. B.; Liang, W. Y.; Han, R.; Niu, C. Y.; Li, C. G.; Wang, C. G.; Wyngaardt, S.; Papka, P.; Bucher, T. D.; Kamblawe, A.; Khaleel, E.; Khumalo, N. A.; Lawrie, E. A.; Lawrie, J. J.; Jones, P.; Mullins, S. M.; Murray, S.; Wiedeking, M.; Sharpey‐Schafer, J. F.; Majola, S. N. T.; Ndayishimye, J.; Negi, D.; Noncolela, S. P.; Ntshangase, S. S.; Shirinda, O.; Sithole, P.; Stankiewicz, M. A.; Orce, J. N.; Dinoko, T. S.; Easton, J. L.; Nyakó, B. M.

doi:10.1103/physrevc.91.061303

Cited by 13 publications

(15 citation statements)

References 60 publications

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“…At low energies, they are also consistent with the empirical constraint of Eq. (30). Compared with the BHF predictions using the CD-Bonn interaction shown in the left panel of Fig.…”

Section: Symmetry (Isovector or Lane) Potentials Predicted By Nuclearmentioning

confidence: 99%

“…However, to our best knowledge, most of the analyses indicate a decreasing Lane potential with increasing nucleon kinetic energy described approximately by Eq. (30). In addition, folding model calculations of optical potentials for nucleus-nucleus scattering, see, e.g.…”

Section: Experimental Constraints On the Symmetry Potential And Neutrmentioning

confidence: 99%

“…For example, the equilibrium neutron/proton ratio in primordial nucleosynthesisis depends on the m * n-p [22]. It is also important for understanding neutrino opacities [23] and several properties of neutron stars [24,25,26], thermal and transport properties as well as the liquid-gas phase transition in neutron-rich matter [27,28,30], properties of mirror nuclei [31], locations of the neutron and proton drip-lines [32], energy level densities of reaction partners [18], reaction dynamics and several isospin-sensitive observables in heavy-ion collisions [33,34,35,36,37,38,39].…”

Section: Introductionmentioning

confidence: 99%

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Nucleon effective masses in neutron-rich matter

Li¹,

Cai²,

Chen³

et al. 2018

Progress in Particle and Nuclear Physics

185

112

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Various kinds of isovector nucleon effective masses are used in the literature to characterize the momentum/energy dependence of the nucleon symmetry potential or self-energy due to the space/time non-locality of the underlying isovector strong interaction in neutron-rich nucleonic matter. The multifaceted studies on nucleon isovector effective masses are multi-disciplinary in nature. Besides structures, masses and low-lying excited states of nuclei as well as nuclear reactions, studies of the isospin dependence of short-range correlations in nuclei from scatterings of high-energy electrons and protons on heavy nuclei also help understand nucleon effective masses especially the so-called E-mass in neutron-rich matter. A thorough understanding of all kinds of nucleon effective masses has multiple impacts on many interesting issues in both nuclear physics and astrophysics. Indeed, essentially all microscopic many-body theories and phenomenological models with various nuclear forces available in the literature have been used to calculate single-nucleon potentials and the associated nucleon effective masses in neutron-rich matter. There are also fundamental principles connecting different aspects and impacts of isovector strong interactions. In particular, the Hugenholtz-Van Hove theorem connects analytically nuclear symmetry energy with both isoscalar and isovector nucleon effective masses as well as their own momentum dependences. It also reveals how the isospin-quartic term in the equation of state of neutron-rich matter depends on the high-order momentum-derivatives of both isoscalar and isovector nucleon potentials. The Migdal-Luttinger theorem facilitates the extraction of nucleon E-mass and its isospin dependence from experimentally constrained single-nucleon momentum distributions. The momentum/energy dependence of the symmetry potential and the corresponding neutron-proton effective mass splitting also affect transport properties and the liquid-gas phase transition in neutron-rich matter. Moreover, they influence the dynamics and isospin-sensitive observables of heavy-ion collisions through both the Vlasov term and the collision integrals of the Boltzmann-Uehling-Uhlenbeck transport equation. We review here some of the significant progresses made in recent years by the nuclear physics community in resolving some of the hotly debated and longstanding issues regarding nucleon effective masses especially in dense neutron-rich matter. We also point out some of the remaining key issues requiring further investigations in the era of high precision experiments using advanced rare isotope beams. Nucleon effective masses in non-relativistic modelsWe focus on non-relativistic nucleon effective masses or the ones derived from the Schrödinger equivalent singleparticle potential in relativistic models. The k-mass M * ,k J and E-mass M * ,E J of a nucleon J = n/p can be obtained from the momentum and energy dependence of the single-nucleon potential U J (ρ, δ, k, E) in nucleonic matter of density ρ and isospin asymmetry δ...

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“…At low energies, they are also consistent with the empirical constraint of Eq. (30). Compared with the BHF predictions using the CD-Bonn interaction shown in the left panel of Fig.…”

Section: Symmetry (Isovector or Lane) Potentials Predicted By Nuclearmentioning

confidence: 99%

Section: Experimental Constraints On the Symmetry Potential And Neutrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nucleon effective masses in neutron-rich matter

Li¹,

Cai²,

Chen³

et al. 2018

Progress in Particle and Nuclear Physics

185

112

View full text Add to dashboard Cite

show abstract

“…The isovector mass splitting is of profound importance in addressing many key problems in nuclear physics, astrophysics and even cosmology. It is critical for understanding transport and thermal properties of asymmetric nuclear matter [19][20][21][22], for neutrino opacities in neutron star matter [23,24], for locating the drip lines [25] in the nuclear mass table. It has also a crucial role to play in understanding neutron/proton ratio in primordial nucleosynthesis [26] in the early universe.…”

Section: Introductionmentioning

confidence: 99%

Nucleon effective mass and its isovector splitting

et al. 2018

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Using an energy density functional (EDF) based on the thermodynamic Gibbs-Duhem relation, found equivalent to the standard Skyrme EDF for infinite nuclear matter, it is demonstrated that the parameters of this EDF are not uniquely determined from the fit of the empirical and theoretical data related to nuclear matter. This prevents an unambiguous determination of the nucleon effective mass ( m * 0 m ) and its isovector splitting (∆m * 0 ). Complementary information from dipole polarizability of atomic nuclei helps in removing this ambiguity and plausible values of m * 0 m and ∆m * 0 can be arrived at. Presently considered fit data on infinite nuclear matter and dipole polarizability of finite nuclei yield m * 0 m = 0.68 ± 0.04 and ∆m * 0 = (−0.20 ± 0.09)δ. This EDF is consistent with the constraint on the maximum mass of the neutron star.

show abstract

“…In recent years, whether the neutron-proton effective mass splitting m * n−p (m * n−p ≡ m * n −m * p ) is negative, zero, or positive in neutron-rich matter becomes a hotly debated topic. It affects the isospin dynamics in nuclear reactions [15][16][17][18][19][20][21], thermodynamic and transport properties of neutronrich matter [22][23][24][25][26], and isovector giant dipole resonances in neutron-rich nuclei [27,28]. Moreover, based on the Hugenholtz-Van Hove theorem, the isospin splitting of the nucleon effective mass is closely related to the nuclear symmetry energy [29,30].…”

Section: Introductionmentioning

confidence: 99%

Reexamining the isospin-relaxation time in intermediate-energy heavy-ion collisions

Wang

et al. 2018

Phys. Rev. C

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Isospin relaxation times characterizing isospin transport processes between the projectile and the target with different N/Z ratios and that between the neck and the spectator with different isospin asymmetries and densities in intermediate-energy heavy-ion collisions are studied within an isospindependent Boltzmann-Uehling-Uhlenbeck transport model using the lattice Hamiltonian approach. The respective roles and time scales of the isospin diffusion and drift as the major mechanisms of isospin transport in intermediate-energy heavy-ion collisions are discussed. Effects of nuclear symmetry energy and neutron-proton effective mass splitting on the isospin relaxation times are examined.

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Spectroscopy ofSe76: Prolate-to-oblate shape transition

Cited by 13 publications

References 60 publications

Nucleon effective masses in neutron-rich matter

Nucleon effective masses in neutron-rich matter

Nucleon effective mass and its isovector splitting

Reexamining the isospin-relaxation time in intermediate-energy heavy-ion collisions

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