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Collectivity in the light radon nuclei measured directly via Coulomb excitation
Background: Shape coexistence in heavy nuclei poses a strong challenge to state-of-the-art nuclear models, where several competing shape minima are found close to the ground state. A classic region for investigating this phenomenon is in the region around Z=82 and the neutron midshell at N=104. Purp...
| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
2015
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1103/PhysRevC.91.064313 http://cds.cern.ch/record/2001403 |
| _version_ | 1780946026765484032 |
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| author | Gaffney, L.P. Robinson, A.P. Jenkins, D.G. Andreyev, A.N. Bender, M. Blazhev, A. Bree, N. Bruyneel, B. Butler, P.A. Cocolios, T.E. Davinson, T. Deacon, A.N. De Witte, H. DiJulio, D. Diriken, J. Ekström, A. Fransen, Ch. Freeman, S.J. Geibel, K. Grahn, T. Hadinia, B. Hass, M. Heenen, P. -H. Hess, H. Huyse, M. Jakobsson, U. Kesteloot, N. Konki, J. Kröll, Th. Kumar, V. Ivanov, O. Martin-Haugh, S. Mücher, D. Orlandi, R. Pakarinen, J. Petts, A. Peura, P. Rahkila, P. Reiter, P. Scheck, M. Seidlitz, M. Singh, K. Smith, J.F. Van de Walle, J. Van Duppen, P. Voulot, D. Wadsworth, R. Warr, N. Wenander, F. Wimmer, K. Wrzosek-Lipska, K. Zielińska, M. |
| author_facet | Gaffney, L.P. Robinson, A.P. Jenkins, D.G. Andreyev, A.N. Bender, M. Blazhev, A. Bree, N. Bruyneel, B. Butler, P.A. Cocolios, T.E. Davinson, T. Deacon, A.N. De Witte, H. DiJulio, D. Diriken, J. Ekström, A. Fransen, Ch. Freeman, S.J. Geibel, K. Grahn, T. Hadinia, B. Hass, M. Heenen, P. -H. Hess, H. Huyse, M. Jakobsson, U. Kesteloot, N. Konki, J. Kröll, Th. Kumar, V. Ivanov, O. Martin-Haugh, S. Mücher, D. Orlandi, R. Pakarinen, J. Petts, A. Peura, P. Rahkila, P. Reiter, P. Scheck, M. Seidlitz, M. Singh, K. Smith, J.F. Van de Walle, J. Van Duppen, P. Voulot, D. Wadsworth, R. Warr, N. Wenander, F. Wimmer, K. Wrzosek-Lipska, K. Zielińska, M. |
| author_sort | Gaffney, L.P. |
| collection | CERN |
| description | Background: Shape coexistence in heavy nuclei poses a strong challenge to state-of-the-art nuclear models, where several competing shape minima are found close to the ground state. A classic region for investigating this phenomenon is in the region around Z=82 and the neutron midshell at N=104. Purpose: Evidence for shape coexistence has been inferred from α-decay measurements, laser spectroscopy, and in-beam measurements. While the latter allow the pattern of excited states and rotational band structures to be mapped out, a detailed understanding of shape coexistence can only come from measurements of electromagnetic matrix elements. Method: Secondary, radioactive ion beams of Rn202 and Rn204 were studied by means of low-energy Coulomb excitation at the REX-ISOLDE in CERN. Results: The electric-quadrupole (E2) matrix element connecting the ground state and first excited 21+ state was extracted for both Rn202 and Rn204, corresponding to B(E2;21+→01+)=29−8+8 and 43−12+17 W.u., respectively. Additionally, E2 matrix elements connecting the 21+ state with the 41+ and 22+ states were determined in Rn202. No excited 0+ states were observed in the current data set, possibly owing to a limited population of second-order processes at the currently available |
| id | cern-2001403 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2015 |
| record_format | invenio |
| spelling | cern-20014032021-09-03T02:11:52Zdoi:10.1103/PhysRevC.91.064313http://cds.cern.ch/record/2001403engGaffney, L.P.Robinson, A.P.Jenkins, D.G.Andreyev, A.N.Bender, M.Blazhev, A.Bree, N.Bruyneel, B.Butler, P.A.Cocolios, T.E.Davinson, T.Deacon, A.N.De Witte, H.DiJulio, D.Diriken, J.Ekström, A.Fransen, Ch.Freeman, S.J.Geibel, K.Grahn, T.Hadinia, B.Hass, M.Heenen, P. -H.Hess, H.Huyse, M.Jakobsson, U.Kesteloot, N.Konki, J.Kröll, Th.Kumar, V.Ivanov, O.Martin-Haugh, S.Mücher, D.Orlandi, R.Pakarinen, J.Petts, A.Peura, P.Rahkila, P.Reiter, P.Scheck, M.Seidlitz, M.Singh, K.Smith, J.F.Van de Walle, J.Van Duppen, P.Voulot, D.Wadsworth, R.Warr, N.Wenander, F.Wimmer, K.Wrzosek-Lipska, K.Zielińska, M.Collectivity in the light radon nuclei measured directly via Coulomb excitationNuclear Physics - ExperimentBackground: Shape coexistence in heavy nuclei poses a strong challenge to state-of-the-art nuclear models, where several competing shape minima are found close to the ground state. A classic region for investigating this phenomenon is in the region around Z=82 and the neutron midshell at N=104. Purpose: Evidence for shape coexistence has been inferred from α-decay measurements, laser spectroscopy, and in-beam measurements. While the latter allow the pattern of excited states and rotational band structures to be mapped out, a detailed understanding of shape coexistence can only come from measurements of electromagnetic matrix elements. Method: Secondary, radioactive ion beams of Rn202 and Rn204 were studied by means of low-energy Coulomb excitation at the REX-ISOLDE in CERN. Results: The electric-quadrupole (E2) matrix element connecting the ground state and first excited 21+ state was extracted for both Rn202 and Rn204, corresponding to B(E2;21+→01+)=29−8+8 and 43−12+17 W.u., respectively. Additionally, E2 matrix elements connecting the 21+ state with the 41+ and 22+ states were determined in Rn202. No excited 0+ states were observed in the current data set, possibly owing to a limited population of second-order processes at the currently available Background: Shape coexistence in heavy nuclei poses a strong challenge to state-of-the-art nuclear models, where several competing shape minima are found close to the ground state. A classic region for investigating this phenomenon is in the region around $Z=82$ and the neutron mid-shell at $N=104$. Purpose: Evidence for shape coexistence has been inferred from $\alpha$-decay measurements, laser spectroscopy and in-beam measurements. While the latter allow the pattern of excited states and rotational band structures to be mapped out, a detailed understanding of shape coexistence can only come from measurements of electromagnetic matrix elements. Method: Secondary, radioactive ion beams of $^{202}$Rn and $^{204}$Rn were studied by means of low-energy Coulomb excitation at the REX-ISOLDE facility in CERN. Results: The electric-quadrupole ($E2$) matrix element connecting the ground state and first-excited $2^{+}_{1}$ state was extracted for both $^{202}$Rn and $^{204}$Rn, corresponding to ${B(E2;2^{+}_{1} \to 2^{+}_{1})=29^{+8}_{-8}}$ W.u. and $43^{+17}_{-12}$ W.u., respectively. Additionally, $E2$ matrix elements connecting the $2^{+}_{1}$ state with the $4^{+}_{1}$ and $2^{+}_{2}$ states were determined in $^{202}$Rn. No excited $0^{+}$ states were observed in the current data set, possibly due to a limited population of second-order processes at the currently-available beam energies. Conclusions: The results are discussed in terms of collectivity and the deformation of both nuclei studied is deduced to be weak, as expected from the low-lying level-energy schemes. Comparisons are also made to state-of-the-art beyond-mean-field model calculations and the magnitude of the transitional quadrupole moments are well reproduced.arXiv:1503.03245oai:cds.cern.ch:20014032015-03-11 |
| spellingShingle | Nuclear Physics - Experiment Gaffney, L.P. Robinson, A.P. Jenkins, D.G. Andreyev, A.N. Bender, M. Blazhev, A. Bree, N. Bruyneel, B. Butler, P.A. Cocolios, T.E. Davinson, T. Deacon, A.N. De Witte, H. DiJulio, D. Diriken, J. Ekström, A. Fransen, Ch. Freeman, S.J. Geibel, K. Grahn, T. Hadinia, B. Hass, M. Heenen, P. -H. Hess, H. Huyse, M. Jakobsson, U. Kesteloot, N. Konki, J. Kröll, Th. Kumar, V. Ivanov, O. Martin-Haugh, S. Mücher, D. Orlandi, R. Pakarinen, J. Petts, A. Peura, P. Rahkila, P. Reiter, P. Scheck, M. Seidlitz, M. Singh, K. Smith, J.F. Van de Walle, J. Van Duppen, P. Voulot, D. Wadsworth, R. Warr, N. Wenander, F. Wimmer, K. Wrzosek-Lipska, K. Zielińska, M. Collectivity in the light radon nuclei measured directly via Coulomb excitation |
| title | Collectivity in the light radon nuclei measured directly via Coulomb excitation |
| title_full | Collectivity in the light radon nuclei measured directly via Coulomb excitation |
| title_fullStr | Collectivity in the light radon nuclei measured directly via Coulomb excitation |
| title_full_unstemmed | Collectivity in the light radon nuclei measured directly via Coulomb excitation |
| title_short | Collectivity in the light radon nuclei measured directly via Coulomb excitation |
| title_sort | collectivity in the light radon nuclei measured directly via coulomb excitation |
| topic | Nuclear Physics - Experiment |
| url | https://dx.doi.org/10.1103/PhysRevC.91.064313 http://cds.cern.ch/record/2001403 |
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