Production of 265Sg in the 248Cm(22Ne,5n)265Sg reaction and decay properties of two isomeric states in 265Sg

H. Haba, D. Kaji, Y. Kudou, K. Morimoto, K. Morita, K. Ozeki, R. Sakai, T. Sumita, A. Yoneda, Y. Kasamatsu, Y. Komori, A. Shinohara, H. Kikunaga, H. Kudo, K. Nishio, K. Ooe, N. Sato, and K. Tsukada
Phys. Rev. C 85, 024611 – Published 21 February 2012

Abstract

Two isomeric states of 265Sg, i.e., 265Sga and 265Sgb, proposed in Ch. E. Düllmann and A. Türler [Phys. Rev. C 77, 064320 (2008)] were produced in the 248Cm(22Ne,5n)265Sg reaction. Decay properties of 265Sga,b were investigated with a rotating-wheel apparatus for α and spontaneous fission (SF) spectrometry under low background conditions attained by a gas-jet transport system coupled to the RIKEN gas-filled recoil ion separator. Based on genetically correlated α-α(-α) and α-SF decay chains, 18 and 24 events were assigned to 265Sga and 265Sgb, respectively. The half-life T1/2 and α-particle energy Eα of 265Sga were measured to be 8.51.6+2.6 s and 8.84 ± 0.05 MeV, respectively, and those of 265Sgb were 14.42.5+3.7 s and 8.69 ± 0.05 MeV. As a daughter product of 265Sga,b, the decay properties of the 3-s isomeric state in 261Rf, i.e., 261Rfb, were also derived: T1/2 = 2.60.5+0.7 s, Eα = 8.51 ± 0.06 MeV, and SF branch bSF = 0.82 ± 0.09. These results confirm and refine the decay pattern suggested for the decay chain 269Hs 265Sga,b 261Rfa,b 257No in Düllmann and Türler. The production cross sections for 265Sga and 265Sgb were determined to be 18060+80 and 20050+60 pb at 117.8 MeV, respectively, and they are discussed by comparing with the literature data as well as the theoretical prediction.

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  • Received 20 December 2011

DOI:https://doi.org/10.1103/PhysRevC.85.024611

©2012 American Physical Society

Authors & Affiliations

H. Haba*, D. Kaji, Y. Kudou, K. Morimoto, K. Morita, K. Ozeki, R. Sakai, T. Sumita, and A. Yoneda

  • Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan

Y. Kasamatsu, Y. Komori, and A. Shinohara

  • Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan

H. Kikunaga

  • Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan

H. Kudo

  • Department of Chemistry, Niigata University, Niigata, Niigata 950-2181, Japan

K. Nishio, K. Ooe, N. Sato, and K. Tsukada

  • Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan

  • *haba@riken.jp

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Vol. 85, Iss. 2 — February 2012

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