Evidence for non-yrast states in 254No

S. Eeckhaudt; P. T. Greenlees; N. Amzal; J. E. Bastin; E. Bouchez; P. A. Butler; A. Chatillon; K. Eskola; J. Gerl; T. Grahn; A. Görgen; R. -D. Herzberg; F. P. Hessberger; A. Hürstel; P. J. C. Ikin; G. D. Jones; P. Jones; R. Julin; S. Juutinen; H. Kettunen; T. L. Khoo; W. Korten; P. Kuusiniemi; Y. Le Coz; M. Leino; A. -P. Leppänen; P. Nieminen; J. Pakarinen; J. Perkowski; A. Pritchard; P. Reiter; P. Rahkila; C. Scholey; Ch. Theisen; J. Uusitalo; K. Van de Vel; J. Wilson

doi:10.1140/epja/i2005-10163-6

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2023 Impact factor 2.6

Hadrons and Nuclei

Eur. Phys. J. A (2005) 26: 227-232
https://doi.org/10.1140/epja/i2005-10163-6

Original Article

Evidence for non-yrast states in ²⁵⁴No

S. Eeckhaudt¹^*, P. T. Greenlees¹, N. Amzal², J. E. Bastin², E. Bouchez³, P. A. Butler²^,4, A. Chatillon³, K. Eskola⁵, J. Gerl⁶, T. Grahn¹, A. Görgen³, R. -D. Herzberg², F. P. Hessberger⁶, A. Hürstel³, P. J. C. Ikin², G. D. Jones², P. Jones¹, R. Julin¹, S. Juutinen¹, H. Kettunen¹, T. L. Khoo⁷, W. Korten³, P. Kuusiniemi⁶, Y. Le Coz³, M. Leino¹, A. -P. Leppänen¹, P. Nieminen¹, J. Pakarinen¹, J. Perkowski¹, A. Pritchard², P. Reiter⁸, P. Rahkila¹, C. Scholey¹, Ch. Theisen³, J. Uusitalo¹, K. Van de Vel¹ and J. Wilson³

¹ Department of Physics, University of Jyväskylä, Jyväskylä, Finland
² Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
³ DAPNIA/SPhN, CEA-Saclay, Saclay, France
⁴ CERN-ISOLDE, Geneva, Switzerland
⁵ Department of Physics, University of Helsinki, Helsinki, Finland
⁶ GSI, Darmstadt, Germany
⁷ Argonne National Laboratory, Argonne, IL, USA
⁸ IKP, University of Cologne, Cologne, Germany

^* e-mail: sarah.eeckhaudt@phys.jyu.fi

Received: 1 September 2005
Accepted: 16 October 2005
Published online: 16 November 2005

Abstract

Evidence for the decay of non-yrast states in ²⁵⁴No has been observed for the first time in an experiment performed at the University of Jyväskylä. The experiment employed the JUROGAM array of germanium detectors coupled to the gas-filled recoil separator RITU and the focal-plane spectrometer GREAT. The ground-state rotational band has been tentatively extended up to a spin of 24ℏ and has a smoothly behaving dynamical moment of inertia. It is speculated that the observation of high-energy γ-rays is due to the decay of a K = 3 band-head state.

PACS: 23.20.Lv γ transitions and level energies – / 27.90.+b 220≤A – / 29.30.-h Spectrometers and spectroscopic techniques –

© Società Italiana di Fisica and Springer-Verlag, 2005