M. Waroquier

A shell-model description of 0+ intruder states in even-even nuclei

K. Heyde, J. Jolie, J. Moreau, J. Ryckebusch, M. Waroquier, P. Van Duppen, M. Huyse, L.J. Wood
Nuclear Physics A
466 (2), 189-226
1987
A1
Published while none of the authors were employed at the CMM

Abstract 

Starting from the nuclear shell structure in medium-heavy and heavy nuclei, the excitation energy for low-lying 0+ intruder states is studied. Taking as a simplified model two particle-two hole (2p-2h) excitations across closed shells, the effects of the pairing and the proton-neutron (monopole and quadrupole component) residual interaction on the unperturbed energies are calculated. Application to major closed-shell (fZ = 50, Z = 82) and to subshell (Z = 40, Z = 64) regions is performed. We especially concentrate on 0+ intruder states in the even-even Pb nuclei.

DOI 

http://dx.doi.org/10.1016/0375-9474(87)90439-8

Rearrangement effects in shell-model calculations using density-dependent interactions

M. Waroquier, J. Ryckebusch, J. Moreau, K. Heyde, N. Blasi, S.Y. Van Der Werf, G. Wenes
Physics Reports
148 (5), 249-306
1987
A1
Published while none of the authors were employed at the CMM

Abstract 

A general method is developed to treat density-dependent effective nucleon-nucleon interactions in shell-model calculations. A trial function is introduced, that can generate any excitation mode of the nucleus. The method is based on the evaluation of the expectation value of the full Hamiltonian with respect to this generating Slater determinant wave function. Rearrangement effects, due to the density-dependence of the interaction are systematically included. The proposed formalism is applied in first instance to simplified excitation modes, such as two-quasiparticle and particle-hole configurations. A detailed study on the importance of the various types of rearrngement terms is carried out. A more specific application of the general formalism is presented in carrying out an extended shell-model calculation on 116Sn, including, apart from the neutron 2qp-excitations, proton 1p-1h excitations and coupled excitations of the type (1p-1h) ⊗ (2qp).

DOI 

http://dx.doi.org/10.1016/0370-1573(87)90066-4

A new prescription for determining particle-hole interactions near closed shells

K. Heyde, J. Jolie, J. Moreau, J. Ryckebusch, M. Waroquier, L.J. Wood
Physics Letters B
176 (3-4), 255-259
1986
A1
Published while none of the authors were employed at the CMM

Abstract 

Starting from one-nucleon separation energies near doubly-closed shells as well as of the experimental centroid for particle-hole excitations, a new prescription for obtaining residual particle-hole matrix elements is presented. It is shown that the major difference with the standard Blomqvist prescription is a shift in the energy that can be estimated in a graphical way.

DOI 

http://dx.doi.org/10.1016/0370-2693(86)90159-0

High-spin 1p-1h configurations in 116Sn and their fragmentation as seen in the reactions , 116Sn(e, e′), 115In(3He, d) and 115In(α, t)

S.Y. Van Der Werf, N. Blasi, M.N. Harakeh, G. Wenes, A.D. Bacher, G.T. Emery, C.W. Glover, W.P. Jones, H.J. Karwowski, H. Nann, C. Olmer, P. Den Heijer, C.W. De Jager, H. De Vries, J. Ryckebusch, M. Waroquier
Physics Letters B
166 (4), 372-378
1986
A1
Published while none of the authors were employed at the CMM

DOI 

http://dx.doi.org/10.1016/0370-2693(86)91582-0

The level structure of 114Cd from (n, γ) and (d, p) studies

A. Mheemeed, K. Schreckenbach, G. Barreau, H.R. Faust, H.G. Börner, R. Brissot, P. Hungerford, H.H. Schmidt, H.J. Scheerer, T. von Egidy, K. Heyde, L.J. Wood, P. Van Isacker, M. Waroquier, G. Wenes, M.L. Stelts
Nuclear Physics A
412 (1-2), 113-140
1984
A1
Published while none of the authors were employed at the CMM

DOI 

http://dx.doi.org/10.1016/0375-9474(84)90388-9

Triaxial shapes in the interacting boson model

K. Heyde, P. Van Isacker, M. Waroquier, J. Moreau
Physical Review C
29 (4) 1420-1427
1984
A1
Published while none of the authors were employed at the CMM

Abstract 

We suggest the use of cubic terms in the interacting boson model. It is shown that, examining the classical limit, such cubic terms can give rise to stable, triaxial shapes. Energy spectra are studied in the U(5), O(6), and SU(3) limits. Also, a more realistic case is studied in 104Ru. © 1984 The American Physical Society

DOI 

http://dx.doi.org/10.1103/PhysRevC.29.1420

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