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Yrast 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 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 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.
View Article and Find Full Text PDFDoorway states in the gamma decay-out of the yrast superdeformed band in 59Cu.
Phys Rev Lett
December 2003
Department of Physics, Lund University, S-22100 Lund, Sweden.
The decay-out process of the yrast superdeformed band in 59Cu has been investigated. The firm determination of spin, parity, excitation energy, and configuration of the states involved in this process constitutes a unique situation for a detailed understanding of the decay-out mechanism. A theoretical model is introduced that includes a residual interaction and tunneling matrix element between bands, calculated in the configuration-dependent cranked Nilsson-Strutinsky model.
View Article and Find Full Text PDFDirect decay from the superdeformed band to the yrast line in 15266Dy86.
Phys Rev Lett
January 2002
Argonne National Laboratory, Argonne, Illinois 60439, USA.
The excitation energy, spin, and parity of the yrast superdeformed band in 152Dy have been firmly established. The evidence comes mainly from the measured properties of a 4011 keV single-step transition connecting the yrast superdeformed level fed by the 693 keV transition to the 27- yrast state. Four additional, weaker, linking gamma rays have been placed as well.
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