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Direct measurement of three different deformations near the ground state in an atomic nucleus.
Commun Phys
January 2025
Accelerator Laboratory, Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
Atomic nuclei serve as prime laboratories for investigations of complex quantum phenomena, where minor nucleon rearrangements cause significant structural changes. Pb is the heaviest known neutron-deficient Pb isotope that can exhibit three distinct shapes: prolate, oblate, and spherical, with nearly degenerate excitation energies. Here we report on the combined results from three state-of-the-art measurements to directly observe these deformations in Pb.
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 PDFHigh-spin states and level structure in stable nucleus strontium-84.
Sci Rep
July 2014
1] Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei 230031, China [2] School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand [3] State Key Laboratory of Nuclear Physics and Technology (Peking University), Beijing 100871, China [4] Thailand Center of Excellence in Physics (ThEP), Commission on Higher Education, Thailand.
High-spin states of (84)Sr are populated through the reaction (70)Zn ((18)O, 4n) (84)Sr at the beam energy of 75 MeV. The measurements of excitation functions, γ-γ coincidences, directional correlations of oriented states (DCO) ratios and γ-transition intensities are performed using eight anticompton HPGe detectors and one planar HPGe detector. Based on the experimental results, we establish a new level scheme of (84)Sr, in which 12 new states and nearly 30 new γ-transitions are identified in the present work.
View Article and Find Full Text PDFWell developed deformation in 42Si.
Phys Rev Lett
November 2012
RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
Excited states in (38,40,42) Si nuclei have been studied via in-beam γ-ray spectroscopy with multinucleon removal reactions. Intense radioactive beams of ^{40}S and (44)S provided at the new facility of the RIKEN Radioactive Isotope Beam Factory enabled γ-γ coincidence measurements. A prominent γ line observed with an energy of 742(8) keV in (42) Si confirms the 2(+) state reported in an earlier study.
View Article and Find Full Text PDFNovel manifestation of alpha-clustering structures: new "alpha+208Pb" states in 212Po revealed by their enhanced E1 decays.
Phys Rev Lett
January 2010
CSNSM, IN2P3-CNRS and Université Paris-Sud, 91405 Orsay, France.
Excited states in 212Po were populated by alpha transfer using the 208Pb(18O,14C) reaction, and their deexcitation gamma rays were studied with the Euroball array. Several levels were found to decay by a unique E1 transition (Egamma<1 MeV) populating the yrast state with the same spin value. Their lifetimes were measured by the Doppler-shift attenuation method.
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