Electromagnetic properties of 21O for benchmarking nuclear Hamiltonians

The structure of exotic nuclei provides valuable tests for state-of-the-art nuclear theory. In particular electromagnetic transition rates are more sensitive to aspects of nuclear forces and many-body physics than excitation energies alone. We report the first lifetime measurement of excited states...

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Detalles Bibliográficos
Autores: Heil, S., Petri, M., Vobig, K., Bazin, D., Belarge, J., Bender, P., Brown, B. A., Elder, R., Elman, B., Gade, A., Haylett, T., Holt, J. D., Hüther, T., Hufnagel, A., Iwasaki, H., Kobayashi, N., Loelius, C., Longfellowc, B., Lunderberg, E., Mathy, M., Menéndez Sánchez, Javier, Paschalis, S., Roth, R., Schwenk, A., Simonis, J., Syndikus, I., Weisshaar, D., Whitmore, K.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2020
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/179201
Acceso en línea:https://hdl.handle.net/2445/179201
Access Level:acceso abierto
Palabra clave:Química quàntica
Simulació per ordinador
Quantum chemistry
Computer simulation
Descripción
Sumario:The structure of exotic nuclei provides valuable tests for state-of-the-art nuclear theory. In particular electromagnetic transition rates are more sensitive to aspects of nuclear forces and many-body physics than excitation energies alone. We report the first lifetime measurement of excited states in 21O, finding ps. This result together with the deduced level scheme and branching ratio of several γ-ray decays are compared to both phenomenological shell-model and ab initio calculations based on two- and three-nucleon forces derived from chiral effective field theory. We find that the electric quadrupole reduced transition probability of e2 fm4, derived from the lifetime of the state, is smaller than the phenomenological result where standard effective charges are employed, suggesting the need for modifications of the latter in neutron-rich oxygen isotopes. We compare this result to both large-space and valence-space ab initio calculations, and by using multiple input interactions we explore the sensitivity of this observable to underlying details of nuclear forces.

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