New Result in the Production and Decay of an Isotope, 278113, of the 113th Element

An isotope of the 113th element, i.e., 278 113, was produced in a nuclear reaction with a 70 Zn beam on a 209 Bi target. We observed six consecutive $\alpha$-decays following the implantation of a heavy particle in nearly the same position in the semiconductor detector under an extremely low backgro...

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Bibliographic Details
Published in:	Journal of the Physical Society of Japan Vol. 81; no. 10; pp. 103201 - 103201-4
Main Authors:	Morita, Kosuke, Morimoto, Kouji, Kaji, Daiya, Haba, Hiromitsu, Ozeki, Kazutaka, Kudou, Yuki, Sumita, Takayuki, Wakabayashi, Yasuo, Yoneda, Akira, Tanaka, Kengo, Yamaki, Sayaka, Sakai, Ryutaro, Akiyama, Takahiro, Goto, Shin-ichi, Hasebe, Hiroo, Huang, Minghui, Huang, Tianheng, Ideguchi, Eiji, Kasamatsu, Yoshitaka, Katori, Kenji, Kariya, Yoshiki, Kikunaga, Hidetoshi, Koura, Hiroyuki, Kudo, Hisaaki, Mashiko, Akihiro, Mayama, Keita, Mitsuoka, Shin-ichi, Moriya, Toru, Murakami, Masashi, Murayama, Hirohumi, Namai, Saori, Ozawa, Akira, Sato, Nozomi, Sueki, Keisuke, Takeyama, Mirei, Tokanai, Fuyuki, Yamaguchi, Takayuki, Yoshida, Atsushi
Format:	Journal Article
Language:	English Japanese
Published:	The Physical Society of Japan 15-10-2012
Online Access:	Get full text
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Summary:	An isotope of the 113th element, i.e., 278 113, was produced in a nuclear reaction with a 70 Zn beam on a 209 Bi target. We observed six consecutive $\alpha$-decays following the implantation of a heavy particle in nearly the same position in the semiconductor detector under an extremely low background condition. The fifth and sixth decays are fully consistent with the sequential decays of 262 Db and 258 Lr in both decay energies and decay times. This indicates that the present decay chain consisted of 278 113, 274 Rg ($Z=111$), 270 Mt ($Z=109$), 266 Bh ($Z=107$), 262 Db ($Z=105$), and 258 Lr ($Z=103$) with firm connections. This result, together with previously reported results from 2004 and 2007, conclusively leads to the unambiguous production and identification of the isotope 278 113 of the 113th element.
Bibliography:	Two-dimensional plot of energy measured by PSD vs TOF measured using timing counters for the run (time period = 10.8 h), in which the decay chain was observed. Events detected by only strip #7 of PSD are shown. A point corresponding to the implantation event is shown by a circle with an arrow. Loci corresponding to projectile-like particles ($A\approx 70$) and target-like particles ($A\approx 209$) are also shown. Decay time (T${\_}$decay) distributions of the decay family originating from 278 113 are indicated. The logarithm of the decay times is taken as the abscissa. Mean lifetimes $\tau$ determined from three decay chains are shown together with the symbols of the nuclides. Curves in the graphs correspond to single-exponential decay curves with $\tau$. Neutron numbers of the nuclides are also indicated in the graphs. (Color) Observed decay chain in the present work together with previously observed chains.
ISSN:	0031-9015 1347-4073
DOI:	10.1143/JPSJ.81.103201