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Octupole signatures in 124,125Ba

P Mason1, G Benzoni1, A Bracco1, F Camera1, B Million1, O Wieland1, S Leoni1, A K Singh1,21, A Al-Khatib2, H Hübel2, P Bringel2, A Bürger2, A Neusser2, G Schönwasser2, G B Hagemann3, C R Hansen3, B Herskind3, G Sletten3, A Algora4, Zs Dombrádi4, J Gál4, G Kalinka4, J Molnár4, B M Nyakó4, D Sohler4, J Timár4, L Zolnai4, M Kmiecik5, A Maj5, J Styczen5, K Zuber5, F Azaiez6, K Hauschild6, A Korichi6, A Lopez-Martens6, J Roccaz6, S Siem6, F Hannachi7, J N Scheurer7, P Bednarczyk8,22, Th Byrski8, D Curien8, O Dorvaux8, G Duchène8, B Gall8, F Khalfallah8, I Piqueras8, J Robin8, K Juhász9, S B Patel10, A O Evans11, G Rainovski11, C M Petrache12, D Petrache12, G La Rana13, R Moro13, G De Angelis14, P Fallon15, I-Y Lee15, J C Lisle16, B Cederwall17, K Lagergen17, R M Lieder18, E Podsvirova18, W Gast18, H Jäger18, N Redon19 and A Görgen20

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The γ decay of the nuclei 124,125Ba has been investigated with the EUROBALL array, using the reaction 64Ni+64Ni at Ebeam = 255 and 261 MeV. Six new E1 transitions have been found in the nucleus 125Ba, suggesting a significant role of octupole correlations in the origin of its parity doublets. The Jπ = 3 level of the nucleus 124Ba has been identified for the first time. Its excitation energy is in very good agreement with a prediction based on a microscopic model including octupole interactions.


PACS

23.20.Lv gamma transitions and level energies

25.75.Gz Particle correlations and fluctuations

21.10.Hw Spin, parity, and isobaric spin

27.60.+j 90(less-than-or-equal-to)A(less-than-or-equal-to)149

Subjects

Nuclear physics

Dates

Issue 10 (October 2005)

Received 17 March 2005

Published 12 September 2005



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