Evidence for Deformed Ground States in Light Kr Isotopes
R. B. PierceyPhysics Department, Vanderbilt University, Nashville, Tennessee 37235J. H. HamiltonPhysics Department, Vanderbilt University, Nashville, Tennessee 37235R. SoundranayagamPhysics Department, Vanderbilt University, Nashville, Tennessee 37235A. V. RamayyaPhysics Department, Vanderbilt University, Nashville, Tennessee 37235C. MaguirePhysics Department, Vanderbilt University, Nashville, Tennessee 37235Xiaojun SunPhysics Department, Vanderbilt University, Nashville, Tennessee 37235Z. ZhaoPhysics Department, Vanderbilt University, Nashville, Tennessee 37235R.L. RobinsonOak Ridge National Laboratory, ∥, Oak Ridge, Tennessee 37830H. J. KimPhysics Department, Vanderbilt University, Nashville, Tennessee 37235S. FrauendorfPhysics Department, University of Tennessee, Knoxville, Tennessee 37916, and Zentralinstitut für Kernforschung Rossendorf, D-8051 Dresden, German Democratic RepublicJ. DöringZentralinstitut für Kernforschung Rossendorf, D-8051 Dresden, German Democratic RepublicL. FunkeZentralinstitut für Kernforschung Rossendorf, D-8051 Dresden, German Democratic RepublicG. WinterPhysics Department, Vanderbilt University, Nashville, Tennessee 37235J. D. RothInstitut für Kernphysik der Universität zu Köln, D-5000 Köln 41, Federal Republic of GermanyLars Nilausen CleemannInstitut für Kernphysik der Universität zu Köln, D-5000 Köln 41, Federal Republic of GermanyJ. EberthPhysics Department, Vanderbilt University, Nashville, Tennessee 37235W. NeumannInstitut für Kernphysik der Universität zu Köln, D-5000 Köln 41, Federal Republic of GermanyJ. C. WellsPhysics Department, Tennessee Technological University, Cookeville, Tennessee 38501Jui‐Teng LinPhysics Department, Tennessee Technological University, Cookeville, Tennessee 38501A.C. ResterPhysics Department University of Florida Gainesville, Florida 32611H. K. CarterPhysics Department, Vanderbilt University, Nashville, Tennessee 37235
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Annotatsiya
The levels in $^{74,76}\mathrm{Kr}$ were studied with in-beam $\ensuremath{\gamma}$-spectroscopy techniques and the ${\ensuremath{\beta}}^{+}$ decay of $^{76}\mathrm{Rb}$. The energies of the ${2}_{1}^{+}$ states in $^{74,76}\mathrm{Kr}$ deviate from smooth behavior compared with the higher spin levels. The yrast cascade $B(E2)$'s are highly collective. The $^{74,76}\mathrm{Kr}$ ground states have unusually large deformation. The origin of this deformation and of shape coexistence in this region is described in terms of the protons driving the deformation.
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