Electromagnetic properties of 21O for benchmarking nuclear Hamiltonians
| Autor: | B. A. Brown, E. Lunderberg, P. C. Bender, J. Simonis, Robert Roth, C. Loelius, Stefanos Paschalis, D. Bazin, Sebastian Heil, Brenden Longfellow, Brandon Elman, Alexandra Gade, M. Mathy, Klaus Vobig, Marina Petri, T. Hüther, A. Hufnagel, Achim Schwenk, K. Whitmore, Jason D. Holt, J. Belarge, R. Elder, I. Syndikus, Javier Fernandez Menendez, D. Weisshaar, T. Haylett, N. Kobayashi, Haruna Iwasaki |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Nuclear and High Energy Physics
Lifetime measurement Nuclear Theory FOS: Physical sciences 01 natural sciences 7. Clean energy Nuclear Theory (nucl-th) Ab initio quantum chemistry methods Simulació per ordinador 0103 physical sciences Effective field theory Nuclear force ddc:530 Química quàntica Nuclear Experiment (nucl-ex) 010306 general physics Nuclear Experiment Physics 010308 nuclear & particles physics Branching fraction Starke Wechselwirkung und exotische Kerne – Abteilung Blaum Observable Computer simulation lcsh:QC1-999 Excited state Quadrupole Ab initio calculations Effective charges Atomic physics Quantum chemistry Exotic nuclei lcsh:Physics Excitation |
| Zdroj: | Physics letters / B 809, 135678 (2020). doi:10.1016/j.physletb.2020.135678 Physics Letters B Dipòsit Digital de la UB Universidad de Barcelona Physics Letters B, Vol 809, Iss, Pp 135678-(2020) |
| ISSN: | 0370-2693 |
| Popis: | 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. Comment: 23 pages, 3 figures |
| Databáze: | OpenAIRE |
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