2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 5, 123-125

Short note

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

Y. Tagaya1,2 - S. Hashimoto2 - K. Morita1 - Y.H. Pu1 - T. Ariga1,3 - 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 T1/2 = 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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