Abstract.
The low-spin structure of the nearly spherical nucleus 146Gd was studied using the 144Sm(4He, 2n) fusion-evaporation reaction. High-statistics \(\gamma - \gamma\) coincidence measurements were performed at iThemba LABS with 7× 109 \( \gamma\)-\( \gamma\) coincidence events recorded. Gated \( \gamma\)-ray energy spectra show evidence for the \( 6^{+}_{2} \rightarrow 3^{-}_{1} \rightarrow 0^{+}_{1}\) cascade of E3 transitions in agreement with recent findings by Caballero and co-workers, but with a smaller branching ratio of \( I_{\gamma} = 4.7(10)\) for the \(6^{+}_{2} \rightarrow 3^{-}_{1}\) 1905.1 keV \( \gamma\) ray. Although these findings may support octupole vibrations in spherical nuclei, sophisticated beyond mean-field calculations including angular-momentum projection are required to interpret in an appropriate way the available data due to the failure of the rotational model assumptions in this nucleus.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
A. Bohr, B.R. Mottelson, Nuclear Structure, Vol. 2 (World Scientific, Singapore, 1998) p. 654
P.E. Garrett, J.L. Wood, J. Phys. G 37, 064028 (2010)
K. Alder et al., Rev. Mod. Phys. 28, 432 (1956)
P. Kleinheinz, J. Styczen, M. Piiparinen, J. Blomqvist, M. Kortelahti, Phys. Rev. Lett. 48, 1457 (1982)
S. Lunardi et al., Phys. Rev. Lett. 53, 1531 (1984)
M. Piiparinen et al., Phys. Rev. Lett. 70, 150 (1993)
T. Kibédi, R.H. Spear, At. Data Nucl. Data Tables 80, 35 (2002)
M. Yeh, P.E. Garrett, C.A. McGrath, S.W. Yates, T. Belgya, Phys. Rev. Lett. 76, 1208 (1996)
M. Yeh et al., Phys. Rev. C 57, R2085 (1998)
L. Bargioni et al., Phys. Rev. C 51, R1057 (1995)
L. Caballero et al., Phys. Rev. C 81, 031301(R) (2010)
S.W. Yates et al., Z. Phys. A 324, 417 (1986)
M. Lipoglavsek et al., Nucl. Instrum. Methods A 557, 523 (2006)
D.C. Radford, Nucl. Instrum. Methods A 361, 297 (1995)
NNDC database, http://www.nndc.bnl.gov
L. Caballero, Double Octupole States in ${}^{146}Gd$, PhD Thesis, Universidad de Valencia (2005)
K.S. Krane et al., Nucl. Data Tables 11, 351 (1973)
C.M. Petrache et al., Phys. Rev. C 74, 034304 (2006)
P.M. Jones et al., Nucl. Instrum. Methods A 362, 556 (1995)
T.S. Dinoko, in preparation
Krishichayan, arXiv:1308.0119 [nucl-ex]
L.A. Currie, Anal. Chem. 40, 586 (1968)
K.L. Green, MSc Thesis, University of Guelph (2009)
L.M. Robledo, G.F. Bertsch, Phys. Rev. C 84, 054302 (2011)
L.M. Robledo, G.F. Bertsch, Phys. Rev. C 86, 054306 (2012)
D.F. Kusnezov, E.A. Henry, R.A. Meyer, Phys. Lett. B 228, 11 (1989)
N.V. Zamfir, J.-Y. Zhang, R.F. Casten, Phys. Rev. C 66, 057303 (2002)
N.V. Zamfir, D. Kusnezov, Phys. Rev. C 67, 014305 (2003)
K. Nomura, D. Vretenar, T. Niksic, B.-N. Lu, Phys. Rev. C 89, 024312 (2014)
K. Nomura, R. Rodriguez-Guzman, L.M. Robledo, Phys. Rev. C 92, 014312 (2014)
P.A. Butler, W. Nazarewicz, Rev. Mod. Phys. 68, 349 (1996)
L.M. Robledo, EPJ Web of Conferences 66, 02091 (2014)
R. Rodríguez-Guzmán, L.M. Robledo, P. Sarriguren, Phys. Rev. C 86, 034336 (2012)
L.M. Robledo, P.A. Butler, Phys. Rev. C 88, 051302 (2013)
W.D. Kulp et al., Phys. Rev. C 77, 061301(R) (2008)
P.E. Garrett, J. Phys. G 27, R1 (2001)
Author information
Authors and Affiliations
Corresponding author
Additional information
Communicated by D. Pierroutsakou
Rights and permissions
About this article
Cite this article
Orce, J.N., Kumar Raju, M., Khumalo, N.A. et al. Search for two-phonon octupole excitations in 146Gd . Eur. Phys. J. A 52, 166 (2016). https://doi.org/10.1140/epja/i2016-16166-2
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1140/epja/i2016-16166-2