Angular-momentum projection in coupled-cluster theory: Structure of 34Mg

Hagen, G.; Novario, S. J.; Sun, Z. H.; Papenbrock, T.; Jansen, G. R.; Lietz, J. G.; Duguet, T.; Tichai, A.

doi:10.1103/PhysRevC.105.064311

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Angular-momentum projection in coupled-cluster theory: Structure of ³⁴Mg

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Tichai, A.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Citation

Hagen, G., Novario, S. J., Sun, Z. H., Papenbrock, T., Jansen, G. R., Lietz, J. G., et al. (2022). Angular-momentum projection in coupled-cluster theory: Structure of ³⁴Mg. Physical Review C, 105(6): 064311. doi:10.1103/PhysRevC.105.064311.

Cite as: https://hdl.handle.net/21.11116/0000-000A-E869-B

Abstract

Single- reference coupled-cluster theory is an accurate and affordable computational method for the nuclear many-body problem. For open-shell nuclei, the reference state typically breaks rotational invariance and angular momentum must be restored as a good quantum number. We perform angular-momentum projection after variation and employ the disentangled coupled-cluster formalism and a Hermitian approach. We compare our results with benchmarks for 8Be and 20Ne using a two-nucleon interaction from chiral effective field theory and for pf -shell nuclei within the traditional shell model. We compute the rotational band in the exotic nucleus 34Mg and find agreement with data.