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Mixed-symmetry octupole and hexadecapole excitations in the N=52 isotones

A. Hennig ; M. Spieker ; V. Werner ; T. Ahn ; V. Anagnostatou ; N.P. Cooper ; V. Derya ; M. Elvers ; J. Endres ; P.M. Goddard ; Andreas Martin Heinz (Institutionen för fundamental fysik) ; R.O. Hughes ; G. Ilie ; M.N. Mineva ; P. Petkov ; S.G. Pickstone ; N.A. Pietralla ; D. Radeck ; T.J. Ross ; D. Savran ; A. Zilges
Physical Review C - Nuclear Physics (0556-2813). Vol. 90 (2014), 5, p. Art. no. 051302.
[Artikel, refereegranskad vetenskaplig]

Background: Excitations with mixed proton-neutron symmetry have been previously observed in the N=52 isotones. Besides the well-established quadrupole mixed-symmetry states (MSS), octupole and hexadecapole MSS have been recently proposed for the nuclei Zr92 and Mo94. Purpose: The heaviest stable N=52 isotone Ru96 was investigated to study the evolution of octupole and hexadecapole MSS with increasing proton number. Methods: Two inelastic proton-scattering experiments on Ru96 were performed to extract branching ratios, multipole mixing ratios, and level lifetimes. From the combined data, absolute transition strengths were calculated. Results: Strong M1 transitions between the lowest-lying 3- and 4+ states were observed, providing evidence for a one-phonon mixed-symmetry character of the 32(-) and 42+ states. Conclusions: sdg-IBM-2 calculations were performed for Ru96. The results are in excellent agreement with the experimental data, pointing out a one-phonon hexadecapole mixed-symmetry character of the 42+ state. The 31-||M1||32(-) matrix element is found to scale with the 2s+||M1||2ms+ matrix element.



Denna post skapades 2014-12-19. Senast ändrad 2015-03-30.
CPL Pubid: 208777

 

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Institutioner (Chalmers)

Institutionen för fundamental fysik (2005-2015)

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Tungjonsfysik
Lågenergifysik

Chalmers infrastruktur