Skip to Main Content

Access Provided by Xinjiang University

Physical Review C

Access by Xinjiang University

Prompt and delayed spectroscopy of ${}^{199}{At}$

U. Jakobsson^1,*, J. Uusitalo¹, S. Juutinen¹, M. Leino¹, P. Nieminen¹, K. Andgren², B. Cederwall², P. T. Greenlees¹, B. Hadinia^2,† et al.

P. Jones¹, R. Julin¹, S. Ketelhut¹, A. Khaplanov², M. Nyman^1,‡, P. Peura¹, P. Rahkila¹, P. Ruotsalainen¹, M. Sandzelius¹, J. Sarén¹, C. Scholey¹, and J. Sorri¹

¹Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
²Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden

^*ulrika.jakobsson@jyu.fi
^†Current address: Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada.
^‡Current address: Laboratory of Radiochemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland.

Phys. Rev. C 82, 044302 – Published 6 October, 2010

DOI: https://doi.org/10.1103/PhysRevC.82.044302

Abstract

The neutron-deficient nucleus ${}^{199}{At}$ has been studied through $γ$ -ray and electron spectroscopy, using the recoil-decay tagging technique. Two experiments were conducted, using a gas-filled recoil separator with a focal-plane spectrometer alone and together with a germanium-detector array at the target position. The resulting level scheme for ${}^{199}{At}$ includes a new isomer with a half-life of 0.80(5) $μ$ s and a spin and parity of ( $29 / 2^{+}$ ). The $13 / 2^{+}$ isomer, which de-excites via an $M 2$ transition to the $9 / 2^{-}$ ground state, was measured to have a half-life of 70(20) ns. Our earlier version of the level scheme for ${}^{197}{At}$ has been updated as well.

Article Text

References (40)

K. Heyde, P. Van Isacker, M. Waroquier, J. L. Wood, and R. A. Meyer, Phys. Rep. 102, 291 (1983).
J. L. Wood, K. Heyde, W. Nazarewicz, M. Huyse, and P. Van Duppen, Phys. Rep. 215, 101 (1992).
K. Helariutta et al., Eur. Phys. J. A 6, 289 (1999).
K. Van de Vel et al., Eur. Phys. J. A 17, 167 (2003).
K. Dybdal, T. Chapuran, D. B. Fossan, W. F. Piel Jr., D. Horn, and E. K. Warburton, Phys. Rev. C 28, 1171 (1983).
T. P. Sjoreen, D. B. Fossan, U. Garg, A. Neskakis, A. R. Poletti, and E. K. Warburton, Phys. Rev. C 25, 889 (1982).
T. P. Sjoreen, U. Garg, and D. B. Fossan, Phys. Rev. C 23, 272 (1981).
T. P. Sjoreen, G. Schatz, S. K. Bhattacherjee, B. A. Brown, D. B. Fossan, and P. M. S. Lesser, Phys. Rev. C 14, 1023 (1976).
I. Bergström, B. Fant, C. J. Herrlander, K. Wikström, and J. Blomqvist, Phys. Scr. 1, 243 (1970).
R. F. Davie, A. R. Poletti, G. D. Dracoulis, A. P. Byrne, and C. Fahlander, Nucl. Phys. A 430, 454 (1984).
K. Andgren et al., Phys. Rev. C 78, 044328 (2008).
W. Męczyński et al., Eur. Phys. J. A 3, 311 (1998).
J. Styczeń et al., AIP Conf. Proc. 495, 255 (1999).
M. Lach et al., Eur. Phys. J. A 9, 307 (2000).
K. Andgren et al., Phys. Rev. C 77, 054303 (2008).
C. W. Beausang et al., Nucl. Instrum. Methods Phys. Res. A 313, 37 (1992).
C. Rossi Alvarez, Nucl. Phys. News 3, 10 (1993).
M. Leino et al., Nucl. Instrum. Methods Phys. Res. B 99, 653 (1995).
R. D. Page et al., Nucl. Instrum. Methods Phys. Res. B 204, 634 (2003).
I. H. Lazarus et al., IEEE Trans. Nucl. Sci. 48, 567 (2001).
P. J. Nolan, F. A. Beck, and D. B. Fossan, Annu. Rev. Nucl. Part. Sci. 44, 561 (1994).
E. S. Paul et al., Phys. Rev. C 51, 78 (1995).
P. Rahkila, Nucl. Instrum. Methods Phys. Res. A 595, 637 (2008).
D. C. Radford, Nucl. Instrum. Methods Phys. Res. A 361, 297 (1995).
D. C. Radford, Nucl. Instrum. Methods Phys. Res. A 361, 306 (1995).
B. Singh, Nucl. Data Sheets 108, 79 (2007).
H. De Witte et al., Eur. Phys. J. A 23, 243 (2005).
T. Weckström, B. Fant, T. Lönnroth, V. Rahkonen, A. Källberg, and C.-J. Herrlander, Z. Phys. A 321, 231 (1985).
F. G. Kondev, Nucl. Data Sheets 108, 365 (2007).
A. M. Oros, K. Heyde, C. De Coster, B. Decroix, R. Wyss, B. R. Barrett, and P. Navratil, Nucl. Phys. A 645, 107 (1999).
L. A. Bernstein et al., Phys. Rev. C 52, 621 (1995).
D. R. Wiseman et al., Eur. Phys. J. A 34, 275 (2007).
P. Nieminen et al., Phys. Rev. C 69, 064326 (2004).
T. Lönnroth, C. W. Beausang, D. B. Fossan, L. Hildingsson, W. F. Piel Jr., M. A. Quader, S. Vajda, T. Chapuran, and E. K. Warburton, Phys. Rev. C 33, 1641 (1986).
F. Dönau and S. Frauendorf, in Proceedings of the Conference on High Angular Momentum Properties of Nuclei, Oak Ridge, Tennessee, USA, 1982, edited by N. R. Johnson (Harwood, New York, 1983), p. 143.
F. Dönau, Nucl. Phys. A 471, 469 (1987).
R. B. E. Taylor et al., Phys. Rev. C 59, 673 (1999).
M. Lach et al., Z. Phys. A 350, 207 (1994).
D. Horn, C. Baktash, and C. J. Lister, Phys. Rev. C 24, 2136 (1981).
G. K. Mabala et al., Eur. Phys. J. A 25, 49 (2005).