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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mn>0</mml:mn><mml:mi>gs</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:mo>→</mml:mo><mml:msubsup><mml:mn>2</mml:mn><mml:mn>1</mml:mn><mml:mo>+</mml:mo></mml:msubsup></mml:math>Transition Strengths in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Sn</mml:mi><mml:mprescripts/><mml:none/><mml:mn>106</mml:mn></mml:mmultiscripts></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Sn</mml:mi><mml:mprescripts/><mml:none/><mml:mn>108</mml:mn></mml:mmultiscripts></mml:math>

A. EkströmPhysics Department, University of Lund, Box 118, SE-221 00 Lund, SwedenJ. CederkällPH Department, CERN 1211, Geneva 23, SwitzerlandC. FahlanderPhysics Department, University of Lund, Box 118, SE-221 00 Lund, SwedenM. Hjorth‐JensenPhysics Department and Center of Mathematics for Applications, University of Oslo, Oslo, NorwayF. AmesTRIUMF, Vancouver, CanadaP. A. ButlerOliver Lodge Laboratory, University of Liverpool, Liverpool, United KingdomT. DavinsonJ. EberthInstitute of Nuclear Physics, University of Cologne, Cologne, GermanyF. FinckeInstitute of Nuclear Physics, University of Cologne, Cologne, GermanyA. GörgenCEA Saclay, Service de Physique Nucléaire, Gif-sur-Yvette, FranceM. GórskaGesellschaft für Schwerionenforschung, Darmstadt, GermanyD. HabsPhysics Department, Ludwig-Maximilian University, Munich, GermanyA. M. HurstOliver Lodge Laboratory, University of Liverpool, Liverpool, United KingdomM. HuýseInstituut voor Kern- en Stralingsfysica, K. U. Leuven, Leuven, BelgiumO. IvanovInstituut voor Kern- en Stralingsfysica, K. U. Leuven, Leuven, BelgiumJ. IwanickiHeavy Ion Laboratory, University of Warsaw, Warsaw, PolandO. KesterGesellschaft für Schwerionenforschung, Darmstadt, GermanyU. KösterInstitut Laue Langevin, 6 rue Jules Horowitz, 38042 Grenoble, FranceB. A. MarshAB Department, CERN 1211, Geneva 23, SwitzerlandJ. MierzejewskiHeavy Ion Laboratory, University of Warsaw, Warsaw, PolandP. ReiterInstitute of Nuclear Physics, University of Cologne, Cologne, GermanyH. ScheitMax-Planck Institute of Nuclear Physics, Heidelberg, GermanyD. SchwalmMax-Planck Institute of Nuclear Physics, Heidelberg, GermanyS. SiemDepartment of Physics, University of Oslo, Oslo, NorwayG. SlettenPhysics Department, University of Copenhagen, Copenhagen, DenmarkI. ŞtefânescuInstituut voor Kern- en Stralingsfysica, K. U. Leuven, Leuven, BelgiumG. M. TvetenDepartment of Physics, University of Oslo, Oslo, NorwayJ. Van de WalleInstituut voor Kern- en Stralingsfysica, K. U. Leuven, Leuven, BelgiumP. Van DuppenInstituut voor Kern- en Stralingsfysica, K. U. Leuven, Leuven, BelgiumD. VoulotAB Department, CERN 1211, Geneva 23, SwitzerlandN. WarrInstitute of Nuclear Physics, University of Cologne, Cologne, GermanyD. WeißhaarInstitute of Nuclear Physics, University of Cologne, Cologne, GermanyF. WenanderAB Department, CERN 1211, Geneva 23, SwitzerlandM. ZielińskaCEA Saclay, Service de Physique Nucléaire, Gif-sur-Yvette, France

Physical Review Lettersjournal2008lv

ABI

Аннотация

The reduced transition probabilities, $B(E2;{0}_{\mathrm{gs}}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})$, have been measured in the radioactive isotopes $^{108,106}\mathrm{Sn}$ using subbarrier Coulomb excitation at the REX-ISOLDE facility at CERN. Deexcitation $\ensuremath{\gamma}$ rays were detected by the highly segmented MINIBALL Ge-detector array. The results, $B(E2;{0}_{\mathrm{gs}}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})=0.222(19){e}^{2}{b}^{2}$ for $^{108}\mathrm{Sn}$ and $B(E2;{0}_{\mathrm{gs}}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})=0.195(39){e}^{2}{b}^{2}$ for $^{106}\mathrm{Sn}$ were determined relative to a stable $^{58}\mathrm{Ni}$ target. The resulting $B(E2)$ values are $\ensuremath{\sim}30%$ larger than shell-model predictions and deviate from the generalized seniority model. This experimental result may point towards a weakening of the $N=Z=50$ shell closure.

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Мавзулар

Nuclear physics research studies Astronomical and nuclear sciences Nuclear Physics and Applications

Идентификаторлар

DOI: 10.1103/physrevlett.101.012502

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