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Evolution of quadrupole collectivity in N=80 isotones toward the Z=64 subshell gap: The $B(E2;2_{1}^{+} \rightarrow 0_{1}^{+})$ value of $^{142}$Sm
/ Stegmann, R (Darmstadt, Tech. Hochsch.) ; Bauer, C (Darmstadt, Tech. Hochsch.) ; Rainovski, G (Sofiya U.) ; Pietralla, N (Darmstadt, Tech. Hochsch.) ; Stahl, C (Darmstadt, Tech. Hochsch.) ; Bönig, S (Darmstadt, Tech. Hochsch.) ; Ilieva, S (Darmstadt, Tech. Hochsch.) ; Blazhev, A (Cologne U.) ; Damyanova, A (Sofiya U. ; Geneva U.) ; Danchev, M (Sofiya U.) et al.
It was shown that the evolution of the $B(E2;2_{1}^{+} \rightarrow 0_{1}^{+})$ values in $N$ = 80 isotones from Te to Nd is affected by the underlying subshell structure. This manifests itself in the observation of the local suppression of the $B(E2)$ value at $Z$ = 58 with respect to the neighboring nuclei $^{136}$Ba and $^{140}$Nd. [...]
APS, 2015 - 5 p.
- Published in : Phys. Rev. C 91 (2015) 054326
Published fulltext: PDF;
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Collective 2$^{+1}$ excitations in$^{206}$Po and$^{208,210}$Rn
/ Grahn, T (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Pakarinen, J (Jyvaskyla U. ; Helsinki Inst. of Phys. ; CERN) ; Jokiniemi, L (Jyvaskyla U.) ; Albers, M (Cologne U.) ; Auranen, K (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Bauer, C (Darmstadt, Tech. Hochsch.) ; Bernards, C (Yale U.) ; Blazhev, A (Cologne U.) ; Butler, P A (Liverpool U.) ; Bönig, S (Darmstadt, Tech. Hochsch.) et al.
In the present study, $B(E2, 2^{+1}\rightarrow 0^{+1})$ values have been measured in the$^{208,210}$Rn and$^{206}$Po nuclei through Coulomb excitation of re-accelerated radioactive beams in inverse kinematics at CERN-ISOLDE. These nuclei have been proposed to lie in, or at the boundary of the region where the seniority scheme should persist. [...]
2016
- Published in : Eur. Phys. J. A 52 (2016) 340
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Deformation and mixing of coexisting shapes in neutron-deficient polonium isotopes
/ Kesteloot, N (KU Leuven, Dept. Phys. Astron. ; SCK-CEN, Mol) ; Bastin, B (KU Leuven, Dept. Phys. Astron. ; GANIL) ; Gaffney, L P (KU Leuven, Dept. Phys. Astron. ; Liverpool U.) ; Wrzosek-Lipska, K (KU Leuven, Dept. Phys. Astron. ; Warsaw U., Heavy Ion Lab) ; Auranen, K (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Bauer, C (Darmstadt, Tech. Hochsch.) ; Bender, M (CENBG, Gradignan) ; Bildstein, V (Munich, Tech. U.) ; Blazhev, A (Cologne U.) ; Bönig, S (Darmstadt, Tech. Hochsch.) et al.
Coulomb-excitation experiments are performed with postaccelerated beams of neutron-deficient Po196,198,200,202 isotopes at the REX-ISOLDE facility. A set of matrix elements, coupling the low-lying states in these isotopes, is extracted. [...]
2015 - 17 p.
- Published in : Phys. Rev. C 92 (2015) 054301
APS Open Access article: PDF;
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4.
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The structure of low-lying states in ${}^{140}$Sm studied by Coulomb excitation
/ Klintefjord, M. (Oslo U.) ; Hadyńska-Klȩk, K. (INFN, Legnaro ; Oslo U.) ; Görgen, A. (Oslo U.) ; Bauer, C. (Darmstadt, Tech. Hochsch.) ; Bello Garrote, F.L. (Oslo U.) ; Bönig, S. (Darmstadt, Tech. Hochsch.) ; Bounthong, B. (Strasbourg, IPHC) ; Damyanova, A. (Geneva U.) ; Delaroche, J.P. (CEA DAM) ; Fedosseev, V. (CERN) et al.
The electromagnetic structure of $^{140}$Sm was studied in a low-energy Coulomb excitation experiment with a radioactive ion beam from the REX-ISOLDE facility at CERN. The $2^+$ and $4^+$ states of the ground-state band and a second $2^+$ state were populated by multi-step excitation. [...]
arXiv:1603.01525.-
2016-05-02 - 14 p.
- Published in : Phys. Rev. C 93 (2016) 054303
APS Open Access article: PDF; Fulltext: PDF; External link: Preprint
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Quadrupole collectivity in neutron-rich Cd isotopes
/ Kröll, T (Darmstadt, Tech. U.) ; Ilieva, S (Darmstadt, Tech. Hochsch.) ; Bönig, S (Darmstadt, Tech. Hochsch.) ; Thürauf, M (Darmstadt, Tech. Hochsch.) ; Hartig, A L (Darmstadt, Tech. Hochsch.)
In this contribution, nuclear structure studies with post-accelerated radioactive beams of the neutron-rich isotopes $^{122,123,124,126,128}$Cd from the REX-ISOLDE facility at CERN are presented. The method employed is ($\gamma$)-ray spectroscopy with the MINIBALL array following “safe” Coulomb excitation. [...]
2015 - 5 p.
- Published in : JPS Conf. Proc. 6 (2015) 020009
In : 2nd Conference on Advances in Radioactive Isotope Science, Tokyo, Japan, 1 - 6 Jun 2014, pp.020009
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Determination of the B(E3, 0(+) -> 3(-))-excitation strength in octupole-correlated nuclei near A approx 224 by the means of Coulomb excitation at REX-ISOLDE
/ Scheck, M ; Gaffney, L P ; Butler, P A ; Hayes, A B ; Wenander, F (CERN) ; Albers, M ; Bastin, B ; Bauer, C ; Blazhev, A ; Bönig, S et al.
The IS475 collaboration conducted Coulomb-excitation experiments with postaccelerated radioactive (220)Rn and (224)Ra beams at the REX-ISOLDE facility. The beam particles (E(beam) ≈ 2.83 MeV/u) were Coulomb excited using (60)Ni, (114)Cd, and (120)Sn scattering targets. [...]
2014 - 4 p.
- Published in : J. Phys.: Conf. Ser. 533 (2014) 012007
In : 20th International School on Nuclear Physics, Neutron Physics and Applications, Varna, Bulgaria, 16 - 22 Sep 2013, pp.012007
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7.
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Coulomb excitation of neutron-rich Cd isotopes
/ Ilieva, S (Tech. U. Darmstadt, Inst. Nucl. Phys.) ; Thürauf, M (Tech. U. Darmstadt, Inst. Nucl. Phys.) ; Kröll, Th (Tech. U. Darmstadt, Inst. Nucl. Phys.) ; Krücken, R (Munich, Tech. U.) ; Behrens, T (Munich, Tech. U.) ; Bildstein, V (Munich, Tech. U. ; Heidelberg, Max Planck Inst.) ; Blazhev, A (Cologne U.) ; Bönig, S (Tech. U. Darmstadt, Inst. Nucl. Phys.) ; Butler, P A (Liverpool U.) ; Cederkäll, J (CERN) et al.
The isotopes Cd122,124,126 were studied in a “safe” Coulomb-excitation experiment at the radioactive ion-beam facility REX-ISOLDE at CERN. The reduced transition probabilities B(E2;0g.s.+→21+) and limits for the quadrupole moments of the first 2+ excited states in the three isotopes were determined. [...]
2014 - 10 p.
- Published in : Phys. Rev. C 89 (2014) 014313
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Study of the effect of shell stabilization of the collective isovector valence-shell excitations along the N=80 isotonic chain
/ Stegmann, Robert (Insitut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany) ; Bauer, Christopher (Insitut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany) ; Rainovski, Georgi (Department of Atomic Physics, University of Sofia, Sofia, Bulgaria) ; Pietralla, Norbert (Insitut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany) ; Bönig, Sabine (Insitut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany) ; Ilieva, Stoyanka (Insitut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany) ; Stahl, Christian (Insitut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany) ; Danchev, Miroslav (Department of Atomic Physics, University of Sofia, Sofia, Bulgaria) ; Gladnishki, Kalin (Department of Atomic Physics, University of Sofia, Sofia, Bulgaria) ; Damyanova, Antoaneta (Department of Atomic Physics, University of Sofia, Sofia, Bulgaria) et al.
CERN-INTC-2015-013 ; INTC-SR-049.
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2015.
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Studies of pear-shaped nuclei using accelerated radioactive beams
/ Gaffney, L P (Liverpool U.) ; Butler, P A (Liverpool U.) ; Scheck, M (Liverpool U. ; Darmstadt, Tech. Hochsch.) ; Hayes, A B (Rochester U.) ; Wenander, F (CERN) ; Albers, M (Cologne U.) ; Bastin, B (GANIL) ; Bauer, C (Darmstadt, Tech. Hochsch.) ; Blazhev, A (Cologne U.) ; Bonig, S (Darmstadt, Tech. Hochsch.) et al.
There is strong circumstantial evidence that certain heavy, unstable atomic nuclei are ‘octupole deformed’, that is, distorted into a pear shape. This contrasts with the more prevalent rugby-ball shape of nuclei with reflection-symmetric, quadrupole deformations. [...]
2013
- Published in : Nature 497 (2013) 199-204
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10.
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Single-Particle Structure in Neutron-Rich Calcium Isotopes
/ Freeman, Sean; Manchester (-) ; Andreyev, Andrei (York) ; Bönig, S (Darmstadt) ; Butler, Peter (Liverpool) ; Carpenter, Mike (ANL) ; Catford, Wilton (Surrey) ; Cederkall, J (Lund) ; Chapman, Robert (West of Scotland) ; Cocolios, Thomas (Manchester) ; Flavigny, Freddy (Leuven) et al.
CERN-INTC-2012-057 ; INTC-P-358.
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2012.
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