| Autor: |
Loelius, C., Kobayashi, N., Iwasaki, H., Bazin, D., Belarge, J., Bender, P.C., Brown, B. A., Elder, R., Elman, B., Gade, A., Grinder, M., Heil, S., Hufnagel, A., Longfellow, B., Lunderberg, E., Mathy, M., Otsuka, T., Petri, Marina Kalliopi, Syndikus, I., Tsunoda, N., Weisshar, D., Whitmore, K. |
| Jazyk: |
angličtina |
| Rok vydání: |
2018 |
| ISSN: |
1079-7114 |
| Popis: |
An enhanced low-energy electric dipole (E1) strength is identified for the weakly bound excited states of the neutron-rich isotope ^{27}Ne. The Doppler-shift lifetime measurements employing a combination of the γ-ray tracking array GRETINA, the plunger device, and the S800 spectrograph determine the lower limit of 0.030 e^{2} fm^{2} or 0.052 W.u. for the 1/2^{+}→3/2^{-} E1 transition in ^{27}Ne, representing one of the strongest E1 strengths observed among the bound discrete states in this mass region. This value is at least 30 times larger than that measured for the 3/2^{-} decay to the 3/2_{gs}^{+} ground state. A comparison of the present results to large-scale shell-model calculations points to an important role of core excitations and deformation in the observed E1 enhancement, suggesting a novel example of the electric dipole modes manifested in weakly bound deformed systems. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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