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Isomeric decay studies around $$^{204}$$Pt and $$^{148}$$Tb

$$^{204}$$Ptと$$^{148}$$Tb近傍核のアイソマー崩壊に関する研究

Podoly$'a$k, Zs.*; Steer, S. J.*; Pietri, S.*; Werner-Malento, E.*; Regan, P. H.*; Rudolph, D.*; Garnsworthy, A. B.*; Hoischen, R.*; G$'o$rska, M.*; Gerl, J.*; Wollersheim, H. J.*; Kurtukian-Nieto, T.*; Benzoni, G.*; Becker, F.*; Bednarczyk, P.*; Caceres, L.*; Doornenbal, P.*; Geissel, H.*; Gr$c{e}$bosz, J.*; Kelic, A.*; Kojouharov, I.*; Kurz, N.*; Montes, F.*; Prokopowicz, W.*; 斉藤 武彦*; Schaffner, H.*; Tashenov, S.*; Heinz, A.*; Pf$"u$tzner, M.*; Hellstr$"o$m, M.*; Jungclaus, A.*; Andersson, L.-L.*; Atanasova, L.*; Balabanski, D. L.*; Bentley, M. A.*; Blank, B.*; Blazhev, A.*; Brandau, C.*; Brown, J.*; Bruce, A. M.*; Camera, F.*; Catford, W. N.*; Cullen, I. J.*; Dombr$'a$di, Zs.*; Estevez, E.*; Fahlander, C.*; Gelletly, W.*; Ilie, G.*; Johansson, E. K.*; Jolie, J.*; Jones, G. A.*; Kmiecik, M.*; Kondev, F. G.*; Lalkovski, S.*; Liu, Z.*; Maj, A.*; Myalski, S.*; 静間 俊行; Simons, A. J.*; Schwertel, S.*; Walker, P. M.*; Wieland, O.*; Brown, B. A.*

Podoly$'a$k, Zs.*; Steer, S. J.*; Pietri, S.*; Werner-Malento, E.*; Regan, P. H.*; Rudolph, D.*; Garnsworthy, A. B.*; Hoischen, R.*; G$'o$rska, M.*; Gerl, J.*; Wollersheim, H. J.*; Kurtukian-Nieto, T.*; Benzoni, G.*; Becker, F.*; Bednarczyk, P.*; Caceres, L.*; Doornenbal, P.*; Geissel, H.*; Gr$c{e}$bosz, J.*; Kelic, A.*; Kojouharov, I.*; Kurz, N.*; Montes, F.*; Prokopowicz, W.*; Saito, Takehiko*; Schaffner, H.*; Tashenov, S.*; Heinz, A.*; Pf$"u$tzner, M.*; Hellstr$"o$m, M.*; Jungclaus, A.*; Andersson, L.-L.*; Atanasova, L.*; Balabanski, D. L.*; Bentley, M. A.*; Blank, B.*; Blazhev, A.*; Brandau, C.*; Brown, J.*; Bruce, A. M.*; Camera, F.*; Catford, W. N.*; Cullen, I. J.*; Dombr$'a$di, Zs.*; Estevez, E.*; Fahlander, C.*; Gelletly, W.*; Ilie, G.*; Johansson, E. K.*; Jolie, J.*; Jones, G. A.*; Kmiecik, M.*; Kondev, F. G.*; Lalkovski, S.*; Liu, Z.*; Maj, A.*; Myalski, S.*; Shizuma, Toshiyuki; Simons, A. J.*; Schwertel, S.*; Walker, P. M.*; Wieland, O.*; Brown, B. A.*

$$^{208}$$Pbの核破砕反応を用いて多数の特殊な原子核を生成した。アイソマー崩壊の後に遅延$$gamma$$線を測定し、励起状態の核構造研究を行った。その結果、中性子数126を持つ中性子過剰核$$^{204}$$Ptの励起状態について初めての実験的な情報を得ることができた。また、既に報告されている$$^{148}$$Tb and $$^{147}$$Gdの$$I=27hbar$$ and $$I=(49/2)hbar$$アイソマーからの崩壊$$gamma$$線を観測した。これらのアイソマーは、核破砕反応で生成した最も高いdiscreteな励起状態であり、本手法を用いることにより、高スピン核構造研究の新たな展開が可能になると考えられる。

Relativistic energy projectile fragmentation of $$^{208}$$Pb has been used to produce a range of exotic nuclei. The nuclei of interest were studied by detecting delayed $$gamma$$ rays following the decay of isomeric states. Experimental information on the excited states of the neutron-rich $$^{204}$$Pt N=126 nucleus, following internal decay of two isomeric states, was obtained for the first time. In addition, decays from the previously reported isomeric $$I=27hbar$$ and $$I=(49/2)hbar$$ states in $$^{148}$$Tb and $$^{147}$$Gd, respectively, have been observed. These isomeric decays represent the highest discrete states observed to date following a prejectile fragmentation reaction, and opens up the possibilty of doing "high-spin physics" using this technique.

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パーセンタイル:55.18

分野:Physics, Multidisciplinary

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