Rotational bands and particle-hole excitations at very high spin

Bengtsson, T.; Ragnarsson, I.

doi:10.1016/0375-9474(85)90541-x

Cited by 802 publications

(557 citation statements)

References 60 publications

Supporting

Mentioning

545

Contrasting

Order By: Relevance

“…In order to understand the behavior of 159 Er at the highest angular momenta observed, calculations have been performed using the unpaired cranked NilssonStrutinsky (CNS) model [42,49,50]. In this formalism, configurations are specified by the total number of particles in the open j-shells (or 'valence shells') contrary to the CSM formalism where only 'aligned particles' are listed.…”

Section: Strongly-coupled Structuresmentioning

confidence: 99%

Diverse collective excitations in159Erup to high spin

Mustafa¹,

Ollier²,

Simpson³

et al. 2011

Phys. Rev. C

View full text Add to dashboard Cite

A spectroscopic investigation of the γ decays from excited states in 159 Er has been performed in order to study the changing structural properties exhibited as ultrahigh spins (I > 60h) are approached. The nucleus 159 Er was populated by the reaction 116 Cd( 48 Ca,5nγ) at a beam energy of 215 MeV and the resulting γ decays were studied using the Gammasphere spectrometer. New rotational bands and extensions to existing sequences were observed, which are discussed in terms of the cranked shell model, revealing a diverse range of quasiparticle configurations. At spins around 50h there is evidence for a change from dominant prolate collective motion at the yrast line to oblate non-collective structures via the mechanism of band termination. A possible strongly deformed triaxial band occurs at these high spins, which indicates collectivity beyond 50h. The high spin data are interpreted within the framework of cranked Nilsson-Strutinsky calculations.

show abstract

Section: Strongly-coupled Structuresmentioning

confidence: 99%

Diverse collective excitations in159Erup to high spin

Mustafa¹,

Ollier²,

Simpson³

et al. 2011

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…A rapid expansion of applications of the mean-field methods both with [1,2,3,4,5,6,7] and without [8,9,10,11] self-consistency gives rise to various important theoretical issues in the microscopic theory of many-body system. Among others, a property change in the single-particle states and its dynamical relation to the mean-field, a stability of the excited mean-field, a restoration dynamics of broken symmetries for the excited mean-fields and a dynamics of the single-particle level crossing are interesting subjects to be explored.…”

Section: Introductionmentioning

confidence: 99%

Characteristic feature of self-consistent mean-field in level crossing region

2004

View full text Add to dashboard Cite

A shape change of the self-consistent mean-field induced by a configuration change is discussed within the conventional constrained Hartree-Fock (CHF) theory. It is stressed that a single-particle level crossing dynamics should be treated carefully, because the shape of the mean-field in such a finite many-body system as the nucleus strongly changes depending on its configuration. This situation is clearly shown by applying an adiabatic assumption, where the most energetically favorable single-particle states are assumed to be occupied. The excited HF states and the continuouslyconnected potential energy curves are given by applying the configuration dictated CHF method.The effect of pairing correlation is discussed in the level crossing region. Triaxial deformed results in our Hartree-Fock-Bogoliubov (HFB) calculation with Gogny force nicely reproduce the available experimental data of Ge isotopes. From our numerical calculation, it is concluded that the CHFB state is more fragile than the CHF state in the level crossing region.

show abstract

“…The U(3) symmetry of the experimentally found superdeformed, and of the theoretically predicted hyperdeformed bands of the 36 Ar nucleus were determined in [3]. The shell model configurations provided by the model calculations of the superdeformed [7,19], and of the hyperdeformed [8] states resulted in the [32, 12,12], and [48, 8,8] representations, respectively, while the ground state has [20,20,12].…”

mentioning

confidence: 99%

Ternary clusterization and quadrupole deformation

et al. 2006

View full text Add to dashboard Cite

The deformation-dependence of ternary clusterization of atomic nuclei is investigated. In particular, allowed and forbidden ternary clusterconfigurations are determined for the ground, superdeformed, and hyperdeformed states of some light and heavy nuclei, based on a microscopic (real and effective SU(3)) selection rule. The energetic stability of the clusterizations is also considered. The investigation of exotic nuclear shapes, e.g. superdeformed and hyperdeformed states is one of the most interesting topics in recent nuclear structure studies. The appearance of exotic cluster configurations (or exotic cluster decay) is another issue of utmost interest. The combination of these two problems brings us to an exciting question: what is the interrelation of these two phenomena, i.e. what are the possible clusterizations of nuclear states with exotic shapes. In the present Letter we address this question from the angle of the ternary clusterization. We apply methods which can be generalized to more complicated multicluster-configurations in a straightforward way.The basic concept of this work is that when we try to describe the composition of an atomic nucleus from smaller nuclei (clusters) then we take into account both of the two complementary natural laws, which govern this kind of phenomenon: the energy-minimum principle and the Pauli-exclusion principle. The crucial role of these two rules are obvious: energetically unfavored systems are not likely to appear, and when the building blocks are fermions, like the nucleons of the atomic nuclei, then they follow the exclusion principle. However, the exact role, or * Corresponding author.E-mail address: algora@atomki.hu (A. Algora).relative importance of these two aspects of clusterization among different circumstances are not completely understood yet; the present work is meant to be a contribution to this task. Much attention has been paid to the energetic preference of various cluster-configurations of a nucleus. The methods applied along this line are partly or completely empirical ones, using information gained from the experimental data. Furthermore, most of these works concentrate on the simplest, i.e. binary clusterizations, especially, when the energetic calculation involves (in addition to the experimental binding energies) intercluster potentials, like in the dinuclear system model [1], or in the local potential approach [2]. On the other hand the treatment of the exclusion-principle has to be done microscopically, therefore, apart from the light, or simplest heavy nuclei, it gives rise to large computational difficulties. Due to this fact no systematic studies has been done, and many of the experimentally interesting systems are untouched from this viewpoint.The main point of this Letter is to present a method for the approximative treatment of the exclusion principle, which can be applied both to binary [3] and to ternary (and even to multi) cluster-configurations. The results of these calculations can be combined with those on the energetic sta...

show abstract

Rotational bands and particle-hole excitations at very high spin

Cited by 802 publications

References 60 publications

Diverse collective excitations in159Erup to high spin

Diverse collective excitations in159Erup to high spin

Characteristic feature of self-consistent mean-field in level crossing region

Ternary clusterization and quadrupole deformation

Contact Info

Product

Resources

About