English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Paper

Electromagnetic properties of 21O for benchmarking nuclear Hamiltonians

MPS-Authors
/persons/resource/persons188944

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

Fulltext (public)

1912.02884.pdf
(Preprint), 865KB

Supplementary Material (public)
There is no public supplementary material available
Citation

Heil, S., Petri, M., Vobig, K., Bazin, D., Belarge, J., Bender, P., et al. (2020). Electromagnetic properties of 21O for benchmarking nuclear Hamiltonians. Physics Letters B, 809: 135678. doi:10.1016/j.physletb.2020.135678.


Cite as: http://hdl.handle.net/21.11116/0000-0006-EFD3-F
Abstract
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 $^{21}$O, finding $\tau_{1/2^+}=420^{+35}_{-32}\text{(stat)}^{+34}_{-12}\text{(sys)}$\,ps. This result together with the deduced level scheme and branching ratio of several $\gamma$-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 $\rm B(E2;1/2^+ \rightarrow 5/2^+_{g.s.}) = 0.71^{+0.07\ +0.02}_{-0.06\ -0.06}$~e$^2$fm$^4$, derived from the lifetime of the $1/2^+$ 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.