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Parity non-conservation observed in nuclear gamma-decay of (180m) Hf

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    0309884 - ÚJF 2009 RIV PL eng J - Journal Article
    Zákoucký, Dalibor - Stone, J.R. - Goldring, G. - Stone, N. J. - Severijns, N. - Haas, M. - Giles, T. - Koester, U. - Kraev, I. S. - Lakshmi, S. - Lindroos, M. - Wauters, F.
    Parity non-conservation observed in nuclear gamma-decay of (180m) Hf.
    [Nezachování parity pozorované v jaderném gama rozpadu (180m) Hf.]
    Acta physica Polonica. B. Roč. 39, č. 2 (2008), s. 411-416. ISSN 0587-4254. E-ISSN 1509-5770
    Institutional research plan: CEZ:AV0Z10480505
    Keywords : parity nonconservation * gamma decay
    Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
    Impact factor: 0.767, year: 2008

    This paper presents results of experiment which studied (using the Nuclear-Orientation technique) the gamma-decay of isomeric Hf-180m. The described experiment used the newly developed mass-separated Hf-180m beam at ISOLDE, CERN which was implanted into an iron foil polarized at millikelvin temperatures. The observed irregular admixture of E2 to M2/E3 multipolarity in 501 keV 8(-) -> 6(+) gamma-transition was the clear experimental evidence for parity mixing in nuclear states. The temperature dependence of the forward-backward asymmetry of the angular distribution has been measured over extended range of temperatures (and therefore nuclear polarizations), proving a parity mixing of the 8(-) and 8(+) nuclear levels. The value found for the E2/M2 mixing ratio epsilon = -0.032(2) of this transition is in close agreement with averaged value of all previously published results epsilon = -0.030(2).

    Na zařízení ISOLDE v CERN byl měřen rozpad gama Hf-180m. Výsledky jasně ukazují na míchání parity v jaderných stavech.
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