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Evidence for Chiral Wobbler in Nuclei.
Phys Rev Lett
March 2024
Department of Physics, University of Zululand, Private Bag X1001, KwaDlangezwa 3886, South Africa.
Three ΔI=1 bands with the πg_{9/2}⊗νg_{9/2} configuration have been identified in _{35}^{74}Br_{39}. Angular distribution, linear polarization, and lifetime measurements were performed to determine the multipolarity, type, mixing ratio, and absolute transition probability of the transitions. By comparing these experimental observations with the corresponding fingerprints and the quantum particle rotor model calculations, the second and third lowest bands are, respectively, suggested as the chiral partner and one-phonon wobbling excitation built on the yrast band.
View Article and Find Full Text PDFYrast 6⁺ seniority isomers of (136,138)Sn.
Phys Rev Lett
September 2014
IKP, University of Cologne, D-50937 Cologne, Germany.
Delayed γ-ray cascades, originating from the decay of (6⁺) isomeric states, in the very neutron-rich, semimagic isotopes (136,138)Sn have been observed following the projectile fission of a ²³⁸U beam at RIBF, RIKEN. The wave functions of these isomeric states are proposed to be predominantly a fully aligned pair of f(7/2) neutrons. Shell-model calculations, performed using a realistic effective interaction, reproduce well the energies of the excited states of these nuclei and the measured transition rates, with the exception of the B(E2;6⁺→4⁺) rate of ¹³⁶Sn, which deviates from a simple seniority scheme.
View Article and Find Full Text PDFMultiple chiral doublet bands of identical configuration in 103Rh.
Phys Rev Lett
July 2014
Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794-3800, USA.
Three sets of chiral doublet band structures have been identified in the ^{103}Rh nucleus. The properties of the observed chiral doublet bands are in good agreement with theoretical results obtained using constrained covariant density functional theory and particle rotor model calculations. Two of them belong to an identical configuration and provide the first experimental evidence for a novel type of multiple chiral doublets, where an "excited" chiral doublet of a configuration is seen together with the "yrast" one.
View Article and Find Full Text PDFLaser-nucleus reactions: population of states far above yrast and far from stability.
Phys Rev Lett
May 2014
Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany.
Nuclear reactions induced by a strong zeptosecond laser pulse are studied theoretically in the quasiadiabatic regime where the photon absorption rate is comparable to the nuclear equilibration rate. We find that multiple photon absorption leads to the formation of a compound nucleus in the so-far unexplored regime of excitation energies several hundred MeV above the yrast line. At these energies, further photon absorption is limited by neutron decay and/or induced nucleon emission.
View Article and Find Full Text PDFEvolution of collectivity in 72Kr: evidence for rapid shape transition.
Phys Rev Lett
April 2014
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA.
The transition rates from the yrast 2+ and 4+ states in the self-conjugate 72Kr nucleus were studied via lifetime measurements employing the GRETINA array with a novel application of the recoil-distance method. The large collectivity observed for the 4+→2+ transition suggests a prolate character of the excited states. The reduced collectivity previously reported for the 2+→0+ transition was confirmed.
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