Gamma-ray spectroscopy of $^{192-195}$Po

K. Helariutta - et al.

doi:doi:10.1007/s100500050347

2021 Impact factor 3.131

Hadrons and Nuclei

Eur. Phys. J. A 6, 289-302

Gamma-ray spectroscopy of ^192-195Po

K. Helariutta¹ - J.F.C. Cocks¹ - T. Enqvist¹ - P.T. Greenlees¹ - P. Jones¹ - R. Julin¹ - S. Juutinen¹ - P. Jämsen¹ - H. Kankaanpää¹ - H. Kettunen¹ - P. Kuusiniemi¹ - M. Leino¹ - M. Muikku¹ - M. Piiparinen¹ - P. Rahkila¹ - A. Savelius¹ - W.H. Trzaska¹ - S. Törmänen¹ - J. Uusitalo¹ - R.G. Allatt² - P.A. Butler² - R.D. Page² - M. Kapusta³

¹ Accelerator Laboratory, Department of Physics, University of Jyväskylä, 40351 Jyväskylä, Finland
² Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, UK
³ Department of Nuclear Electronics, Soltan Institute for Nuclear Studies, 05-400 Otwock-Swierk, Poland

Received: 5 July 1999 / Revised version: 7 September 1999 Communicated by J. Äystö

Abstract
Prompt and delayed $\gamma$ -rays have been observed from very neutron deficient ^192-195Po nuclei by using the recoil-decay tagging (RDT) and recoil gating techniques. The yrast levels up to the (10⁺) state in the ¹⁹²Po were identified for the first time. Comprehensive data for ¹⁹⁴Po rendered it possible to extend the yrast line and to observe several positive and negative parity non-yrast states. In the odd-mass isotopes ¹⁹³Po and ¹⁹⁵Po, favoured and unfavoured states on top of the 13/2⁺ state have been identified. The results are discussed within the simple vibrator and rotor pictures as well as in the framework of coexisting spherical and deformed-intruder structures.

PACS
27.80.+w $190 \le A \le 219$ - 23.20.Lv Gamma transitions and level energies - 21.60.Ev Collective models - 25.70.-z Low and intermediate energy heavy-ion reactions