Universität zu Köln

Canavan, R. L., Rudigier, M., Regan, P. H., Lebois, M., Wilson, J. N., Jovancevic, N., Soderstrom, P-A, Collins, S. M., Thisse, D., Benito, J., Bottoni, S., Brunet, M., Cieplicka-Orynczak, N., Courtin, S., Doherty, D. T., Fraile, L. M., Hadynska-Klek, K., Haefner, G., Heine, M., Iskra, L. W., Karayonchev, V, Kennington, A., Koseoglou, P., Lotay, G., Lorusso, G., Nakhostin, M., Nita, C. R., Oberstedt, S., Podolyak, Zs, Qi, L., Regis, J-M, Sanchez-Tembleque, V, Shearman, R., Vedia, V. and Witt, W. (2020). Half-life measurements in Dy-164,Dy-166 using gamma-gamma fast-timing spectroscopy with the nu-Ball spectrometer. Phys. Rev. C, 101 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9993

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Abstract

We report on the measurement of lifetimes of excited states in the near-mid-shell nuclei Dy-164,Dy-166 using the gamma-ray coincidence fast-timing method. The nuclei of interest were populated using reactions between an O-18 beam and a gold-backed isotopically enriched Dy-164 target of thickness 6.3 mg/cm(2) at primary beam energies of 71, 76, and 80 MeV from the IPN-Orsay laboratory, France. Excited states were populated in Dy-164, Dy-166, and W-178,W-179 following Coulomb excitation, inelastic nuclear scattering, two-neutron transfer, and fusion-evaporation reaction channels respectively. Gamma rays from excited states were measured using the nu-Ball high-purity germanium (HPGe)-LaBr3 hybrid gamma-ray spectrometer with the excited state lifetimes extracted using the fast-timing coincidence method using HPGe-gated LaBr3-LaBr3 triple coincident events. The lifetime of the first I-pi = 2(+) excited state in Dy-166 was used to determine the transition quadrupole deformation of this neutron-rich nucleus for the first time. The experimental methodology was validated by showing consistency with previously determined excited state lifetimes in Dy-164. The half-lives of the yrast 2(+) states in Dy-164 and Dy-166 were 2.35(6) and 2.3(2) ns, respectively, corresponding to transition quadrupole moment values of Q(0) = 7.58(9) and 7.5(4) eb, respectively. The lifetime of the yrast 2(+) state in Dy-166 is consistent with a quenching of nuclear quadrupole deformation at beta approximate to 0.35 as the N = 104 mid-shell is approached.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Canavan, R. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rudigier, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Regan, P. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lebois, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wilson, J. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jovancevic, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Soderstrom, P-A UNSPECIFIED UNSPECIFIED UNSPECIFIED Collins, S. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Thisse, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Benito, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bottoni, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Brunet, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cieplicka-Orynczak, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Courtin, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Doherty, D. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fraile, L. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hadynska-Klek, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Haefner, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Heine, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Iskra, L. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Karayonchev, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Kennington, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Koseoglou, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lotay, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lorusso, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nakhostin, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nita, C. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Oberstedt, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Podolyak, Zs UNSPECIFIED UNSPECIFIED UNSPECIFIED Qi, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Regis, J-M UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanchez-Tembleque, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Shearman, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vedia, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Witt, W. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-343968
DOI:	10.1103/PhysRevC.101.024313
Journal or Publication Title:	Phys. Rev. C
Volume:	101
Number:	2
Date:	2020
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9993
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NUCLEAR-DATA SHEETS; ISOMER Multiple languages Physics, Nuclear Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/34396