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論文

Fine structure in the $$alpha$$ decay of the 8$$^{+}$$ isomer in $$^{216,218}$$U

Zhang, M. M.*; Tian, Y. L.*; Wang, Y. S.*; Zhang, Z. Y.*; Gan, Z. G.*; Yang, H. B.*; Huang, M. H.*; Ma, L.*; Yang, C. L.*; Wang, J. G.*; et al.

Physical Review C, 106(2), p.024305_1 - 024305_6, 2022/08

 被引用回数:1 パーセンタイル:34.54(Physics, Nuclear)

The extremely neutron-deficient even-even uranium isotopes $$^{216,218}$$U were produced in the complete-fusion reactions induced by impinging $$^{40}$$Ar and $$^{40}$$Ca ions on $$^{180,182,184}$$W targets. Fusion evaporation residues were separated in flight by the gas-filled recoil separator SHANS (Spectrometer for Heavy Atoms and Nuclear Structure) and subsequently identified using the recoil-$$alpha$$-correlation method. In this paper, we report on new $$alpha$$-decay activities with $$E_{alpha} = 10163(27)$$ keV for $$^{216}$$U and $$E_{alpha} = 10073(16)$$ keV for $$^{218}$$U, which decay from the 8$$^{+}$$ isomeric states of $$^{216,218}$$U into the 2$$^{+}$$ states of their daughter nuclei $$^{212,214}$$Th, respectively. The new results extend the systematics of the $$alpha$$-decay fine structure for the $$N$$ = 124 and 126 even-even isotones.

論文

Laser spectroscopy of neutron-rich $$^{207,208}$$Hg isotopes; Illuminating the kink and odd-even staggering in charge radii across the $$N$$ = 126 shell closure

Day Goodacre, T.*; Afanasjev, A. V.*; Barzakh, A. E.*; Marsh, B. A.*; Sels, S.*; Ring, P.*; 中田 仁*; Andreyev, A. N.; 他36名*

Physical Review Letters, 126(3), p.032502_1 - 032502_7, 2021/01

 被引用回数:27 パーセンタイル:94.67(Physics, Multidisciplinary)

The charge radii of $$^{207,208}$$Hg have been studied for the first time and those of $$^{202,203,206}$$Hg remeasured by laser spectroscopy at ISOLDE (CERN). The characteristic kink in the charge radii at the $$N$$ = 126 shell closure has been revealed, providing the first information on its behavior below the $$Z$$ = 82 shell closure. By a theoretical analysis, it is demonstrated, contrary to previous interpretations, that both the kink at $$N$$ = 126 and the odd-even staggering can be described predominantly at the mean-field level and that pairing does not need to play a crucial role in their origin.

論文

J-PARC E27 experiment to search for a nuclear Kaon bound state $$K^-pp$$

今井 憲一; 市川 裕大; 長谷川 勝一; 佐甲 博之; 佐藤 進; 木内 隆太*; 細見 健二; 杉村 仁志; 他36名*

Few-Body Systems, 54(7-10), p.1191 - 1194, 2013/08

 被引用回数:11 パーセンタイル:58.46(Physics, Multidisciplinary)

$$d(pi^{+}, K^+)$$反応を用いてJ-PARCのK1.8ビームラインで$$K^-pp$$束縛状態の探索を行っている(J-PARC E27実験)。この実験では、エネルギー分解能約2MeV/c$$^2$$の制度で、$$K^-pp$$束縛状態の束縛エネルギー及び崩壊幅をミッシングマス分光により求められる。また、準自由過程のハイペロン生成のバックグラウンドを除去するために、飛程検出器を用いて$$K^-pp$$の崩壊から生じる2つの陽子の検出も同時に行った。2012年6月に本実験のデータ収集を行い、初めて$$d(pi^{+}, K^+)$$反応のミッシングマススペクトルを取得することに成功した。

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