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The boundary of the N=90 shape phase transition: 148Ce

Koseoglou, P., Werner, V., Pietralla, N., Ilieva, S., Thürauf, M., Bernards, C., Blanc, A., Bruce, A. M., Cakirli, R. B., Cooper, N. , Fraile, L. M., de France, G., Jentschel, M., Jolie, J., Koester, U., Korten, W., Kröll, T., Lalkovski, S., Mach, H., Mărginean, N., Mutti, P., Patel, Z., Paziy, V., Podolyák, Z., Regan, P. H., Régis, J.-M., Roberts, O. J., Saed-Samii, N., Simpson, G. S., Soldner, T., Ur, C. A., Urban, W., Wilmsen, D. and Wilson, E. (2018) The boundary of the N=90 shape phase transition: 148Ce In: XXII International School on Nuclear Physics, Neutron Physics and Applications, 10–16 Sep 2017, Varna, Bulgaria.

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The even-even N=90 isotones with Z=60-66 are known to undergo a first order phase transition. Such a phase transition in atomic nuclei is characterized by a sudden change of the shape of the nucleus due to changes in the location of the potential minimum. In these proceedings we report a measurement of the B4/2 ratio of 148Ce, which will probe the location of the low-Z boundary of the N=90 phase transitional region. The measured B4/2 value is compared to the prediction from the X(5) symmetry within the interacting boson model at the critical point between the geometrical limits of vibrators and rigid/axial rotors. The EXILL&FATIMA campaign took place at the high-flux reactor of the Institut Laue Langevin, Grenoble, were 235U and 241Pu fission fragments were measured by a hybrid spectrometer consisting of high-resolution HPGe and fast LaBr3(Ce)-scintillator detectors. The fast LaBr3(Ce) detectors in combination with the generalized centroid difference method allowed lifetime measurements in the picosecond region. Furthermore, this kind of analysis can serve as preparation for the FATIMA experiments at FAIR.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Koseoglou, P.
Werner, V.
Pietralla, N.
Ilieva, S.
Thürauf, M.
Bernards, C.
Blanc, A.
Bruce, A. M.
Cakirli, R. B.
Cooper, N.
Fraile, L. M.
de France, G.
Jentschel, M.
Jolie, J.
Koester, U.
Korten, W.
Kröll, T.
Lalkovski, S.
Mach, H.
Mărginean, N.
Mutti, P.
Patel, Z.
Paziy, V.
Podolyák, Z.
Regan, P.
Régis, J.-M.
Roberts, O. J.
Saed-Samii, N.
Simpson, G. S.
Soldner, T.
Ur, C. A.
Urban, W.
Wilmsen, D.
Wilson, E.
Date : 2018
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1088/1742-6596/1023/1/012022
Copyright Disclaimer : Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd
Depositing User : Clive Harris
Date Deposited : 22 May 2018 13:54
Last Modified : 11 Dec 2018 11:24

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