EPJ

2023 Impact factor 2.6
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 6, 63-69

In-beam study of 254No

M. Leino1 - H. Kankaanpää1 - R.-D. Herzberg2 - A.J. Chewter2 - F.P. Heßberger3 - Y. Le Coz4 - F. Becker4 - P.A. Butler2 - J.F.C. Cocks1 - O. Dorvaux1 - K. Eskola5 - J. Gerl3 - P.T. Greenlees2 - K. Helariutta1 - M. Houry4 - G.D. Jones2 - P. Jones1 - R. Julin1 - S. Juutinen1 - H. Kettunen1 - T.L. Khoo6 - A. Kleinböhl3 - W. Korten4 - P. Kuusiniemi1 - R. Lucas4 - M. Muikku1 - P. Nieminen1 - R.D. Page2 - P. Rahkila1 - P. Reiter7 - A. Savelius1 - Ch. Schlegel3 - Ch. Theisen4 - W.H. Trzaska1 - H.-J. Wollersheim3

1 Department of Physics, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland
2 Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, UK
3 Gesellschaft für Schwerionenforschung, Darmstadt, Germany
4 DAPNIA/SPhN CEA-Saclay, France
5 Department of Physics, University of Helsinki, Finland
6 Argonne National Laboratory, Argonne, IL, USA
7 LMU University, München, Germany

Received: 21 May 1999 Communicated by J. Äystö

Abstract
Excited states of the Z = 102 nuclide 254No have been studied in the reaction 208Pb(48Ca,2n) by means of in-beam $\gamma$-ray spectroscopy in combination with recoil gating and recoil decay tagging. A Ge detector array, consisting of four clover detectors, and a gas-filled separator were used. Six $\gamma$-ray lines were observed and associated with E2 transitions in the ground state band of 254No, the highest-lying of these being the 16+ $\rightarrow$ 14+ transition. Based on global systematics and the extrapolated 2+1 excitation energy, the value $\beta$2 = 0.27$\pm$0.03 was extracted for the quadrupole deformation. An improved value for the half-life of 254No, T1/2 = (48$\pm$3) s, was determined.

PACS
27.90.+b $220 \le A$ - 21.10.-k Properties of nuclei; nuclear energy levels - 21.10.Hw Spin, parity, and isaboric spin - 23.20.Lv Gamma transitions and level energies

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