Search Results - "Van Isacker, P."

Seniority isomers and particle–hole conjugation by Van Isacker, P.

“…Seniority is the number of nucleons not in pairs coupled to zero angular momentum. Conditions for the conservation of seniority are well known and are shown…”
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Neutron–proton spin–spin correlations in the ground states of N=Z nuclei by Van Isacker, P., Macchiavelli, A. O.

“…We present expressions for the matrix elements of the spin–spin operator S n · S p in a variety of coupling schemes. These results are then applied to…”
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Symmetries of the interacting boson model by Isacker, P. Van

“…This contribution reviews the symmetry properties of the interacting boson model of Arima and Iachello. While the concept of a dynamical symmetry is by now a…”
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A geometry for the shell model by Van Isacker, P.

“…A geometric interpretation is given of matrix elements of a short-range interaction between states that are written in terms of aligned neutron–proton pairs…”
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Generalized seniority and E2 transitions in the tin isotopes by Morales, Irving O., Van Isacker, P., Talmi, I.

“…Recently, a shallow minimum was discovered in B(E2) values in even Sn isotopes around the middle of the neutron major shell. A peak in that region was expected…”
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Partial conservation of seniority and nuclear isomerism by Van Isacker, P, Heinze, S

“…We point out the possibility of the partial conservation of the seniority quantum number when most eigenstates are mixed in seniority but some remain pure…”
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The role of isospin symmetry in collective nuclear structure by Bentley, M. A, Isacker, P. Van, Warner, D. D

“…The nucleus is a unique laboratory in physics--a quantum many-body system comprising two types of fermion, the neutron and proton, differing in charge but…”
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Generalized partial dynamical symmetry in nuclei by Leviatan, A, Isacker, P Van

“…We introduce the notion of a generalized partial dynamical-symmetry for which part of the eigenstates have part of the dynamical symmetry. This general concept…”
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Geometry of shell-model matrix elements by Van Isacker, P.

“…With use of Wigner's classical-limit expressions for 3 j symbols, matrix elements of the nuclear shell model are given a geometric interpretation in terms of…”
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Exact solution of the isovector neutron-proton pairing Hamiltonian by Dukelsky, J, Gueorguiev, V G, Van Isacker, P, Dimitrova, S, Errea, B, Lerma, S

“…The complete exact solution of the T = 1 neutron-proton pairing Hamiltonian is presented in the context of the SO(5) Richardson-Gaudin model with nondegenerate…”
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A solvable model for octupole phonons by Van Isacker, P.

“…A solvable model is proposed for the description of octupole phonons in closed-shell nuclei, formulated in terms of shell-model particle–hole excitations. With…”
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Partial dynamical symmetry and the vibrational structure of Cd isotopes by Leviatan, A., Gavrielov, N., García-Ramos, J.E., Van Isacker, P.

“…The recently reported deviations of selected non-yrast states in 110 Cd from the expected sphericalvibrator behaviour, is addressed by means of an Hamiltonian…”
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Symmetries and deformations in the spherical shell model by Isacker, P Van, Pittel, S

“…We discuss symmetries of the spherical shell model that make contact with the geometric collective model of Bohr and Mottelson. The most celebrated symmetry of…”
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Gamow–Teller transitions and neutron–proton-pair transfer reactions by Van Isacker, P., Macchiavelli, A.O.

“…We propose a schematic model of nucleons moving in spin–orbit partner levels, j=l±12, to explain Gamow–Teller and two-nucleon transfer data in N=Z nuclei above…”
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Deuteron transfer in N = Z nuclei by VAN ISACKER, P, WARNER, D. D, FRANK, A

“…Predictions are obtained for T=0 and T=1 deuteron-transfer intensities between self-conjugate N=Z nuclei on the basis of a simplified interacting boson model…”
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Seniority in quantum many-body systems. I. Identical particles in a single shell by Van Isacker, P., Heinze, S.

“…A discussion of the seniority quantum number in many-body systems is presented. The analysis is carried out for bosons and fermions simultaneously but is…”
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Nucleation and growth of vortices in a rotating Bose-Einstein condensate by VOROV, O. K, VAN ISACKER, P, HUSSEIN, M. S, BARTSCHAT, K

“…An analytic solution of the Gross-Pitaevskii equation for a rotating Bose-Einstein condensate of trapped atoms describes the onset of vorticity when the…”
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Partial and Quasi Dynamical Symmetries in Nuclei by Van Isacker, P.

“…One of the interesting aspects in the study of atomic nuclei is the strikingly regular behavior many display in spite of being complex quantum-mechanical…”
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Electromagnetic properties of neutron-rich nuclei adjacent to the Z=50 shell closure by Rejmund, M., Navin, A., Biswas, S., Lemasson, A., Caamaño, M., Clément, E., Delaune, O., Farget, F., de France, G., Jacquot, B., Van Isacker, P.

“…Low-lying high-spin yrast states in the exotic odd–odd isotopes 124–128Sb (Z=51) and 118–128In (Z=49), studied for the first time, show a striking difference…”
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Aligned neutron-proton pairs in N ∼ Z nuclei by Van Isacker, P

“…It is argued that N ∼ Z nuclei with 90 A 100 can be interpreted in terms of aligned neutron-proton pairs with angular momentum J = 2j and isospin T = 0. Based…”
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