Isomeric decay studies around Pt and Tb

PtとTb近傍核のアイソマー崩壊に関する研究

Podolyk, Zs.*; Steer, S. J.*; Pietri, S.*; Werner-Malento, E.*; Regan, P. H.*; Rudolph, D.*; Garnsworthy, A. B.*; Hoischen, R.*; Grska, M.*; Gerl, J.*; Wollersheim, H. J.*; Kurtukian-Nieto, T.*; Benzoni, G.*; Becker, F.*; Bednarczyk, P.*; Caceres, L.*; Doornenbal, P.*; Geissel, H.*; Grbosz, J.*; Kelic, A.*; Kojouharov, I.*; Kurz, N.*; Montes, F.*; Prokopowicz, W.*; 斉藤 武彦*; Schaffner, H.*; Tashenov, S.*; Heinz, A.*; Pftzner, M.*; Hellstrm, 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.*; Dombrdi, 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.*

Podolyk, Zs.*; Steer, S. J.*; Pietri, S.*; Werner-Malento, E.*; Regan, P. H.*; Rudolph, D.*; Garnsworthy, A. B.*; Hoischen, R.*; Grska, M.*; Gerl, J.*; Wollersheim, H. J.*; Kurtukian-Nieto, T.*; Benzoni, G.*; Becker, F.*; Bednarczyk, P.*; Caceres, L.*; Doornenbal, P.*; Geissel, H.*; Grbosz, J.*; Kelic, A.*; Kojouharov, I.*; Kurz, N.*; Montes, F.*; Prokopowicz, W.*; Saito, Takehiko*; Schaffner, H.*; Tashenov, S.*; Heinz, A.*; Pftzner, M.*; Hellstrm, 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.*; Dombrdi, 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.*

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Tb and Gdの and アイソマーからの崩壊線を観測した。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 Pb has been used to produce a range of exotic nuclei. The nuclei of interest were studied by detecting delayed rays following the decay of isomeric states. Experimental information on the excited states of the neutron-rich 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 and states in Tb and 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.