The $\alpha$-decay energies and halflives of $^{195g,m}$At and $^{199}$Fr

Y. Tagaya - et al.

doi:doi:10.1007/s100500050266

EPJ

The $\alpha$ -decay energies and halflives of ^195g,mAt and ¹⁹⁹Fr

Y. Tagaya^1,2 - S. Hashimoto² - K. Morita¹ - Y.H. Pu¹ - T. Ariga^1,3 - K. Ohta³ - T. Minemura⁴ - I. Hisanaga⁴ - T. Motobayashi⁴ - T. Nomura5

¹ The Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama 351-0198, Japan
² Department of Physics, School of Science, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8654, Japan
³ Department of Physics, Faculty of Sciences, Saitama University, Urawa-shi, Saitama 338-8570, Japan
⁴ Department of Physics, Rikkyo University, Toshima-ku, Tokyo 171-8501, Japan
⁵ High Energy Accelerator Research Organization, Tanashi Branch, Tanashi-shi, Tokyo 188-8501, Japan

Received: 26 March 1999 Communicated by J. Äystö

Abstract
The $\alpha$ -decay energy and halflife of $^{\rm 195m}$ At were determined to be 6960 $\pm$ 20 keV and 385⁺⁶⁹_-51 ms respectively, on the basis of genetic correlations in the ¹⁶⁹Tm(³⁶Ar, $\alpha$ 6n)¹⁹⁵At reaction, while those of $^{\rm 195g}$ At measured simultaneously were 7105 $\pm$ 30 keV and 146⁺²¹_-17 ms respectively, reconfirming the previously reported values. A new isotope ¹⁹⁹Fr was also produced and identified in the same way in the ¹⁶⁹Tm(³⁶Ar, 6n)¹⁹⁹Fr reaction, yielding E $_\alpha$ = 7655 $\pm$ 40 keV and T_1/2 = 12⁺¹⁰_-4 ms.

PACS
23.60.+e nbsp;decay - 25.70.Gh Compound nucleus - 27.80.+w 190 $\leq$ A $\leq$ 219

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The -decay energies and halflives of 195g,mAt and 199Fr

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The $\alpha$ -decay energies and halflives of ^195g,mAt and ¹⁹⁹Fr