Discovery and investigation of heavy neutron-rich isotopes with time-resolved Schottky spectrometry in the element range from thallium to actinium
Discovery and investigation of heavy neutron-rich isotopes with time-resolved Schottky spectrometry in the element range from thallium to actinium
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DOI：
10.1016/j.physletb.2010.05.078
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发表时间：
2010-08
影响因子：
4.4
通讯作者：
L. Chen;W. Plaß;H. Geissel;R. Knöbel;C. Kozhuharov;Y. Litvinov;Z. Patyk;C. Scheidenberger;K. Siegień-Iwaniuk;B. Sun;H. Weick;K. Beckert;P. Beller;F. Bosch;D. Boutin;L. Caceres;J. Carroll;D. Cullen;I. Cullen;B. Franzke;J. Gerl;M. Gorska;G. Jones;A. Kishada;J. Kurcewicz;S. Litvinov;Zhong Liu;S. Mandal;F. Montes;G. Münzenberg;F. Nolden;T. Ohtsubo;Z. Podolyák;R. Propri;S. Rigby;N. Saito;T. Saito;M. Shindo;M. Steck;P. Ugorowski;P. Walker;S. Williams;M. Winkler;H. Wollersheim;Takayuki Yamaguchi
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文献类型：
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作者：
L. Chen;W. Plaß;H. Geissel;R. Knöbel;C. Kozhuharov;Y. Litvinov;Z. Patyk;C. Scheidenberger;K. Siegień-Iwaniuk;B. Sun;H. Weick;K. Beckert;P. Beller;F. Bosch;D. Boutin;L. Caceres;J. Carroll;D. Cullen;I. Cullen;B. Franzke;J. Gerl;M. Gorska;G. Jones;A. Kishada;J. Kurcewicz;S. Litvinov;Zhong Liu;S. Mandal;F. Montes;G. Münzenberg;F. Nolden;T. Ohtsubo;Z. Podolyák;R. Propri;S. Rigby;N. Saito;T. Saito;M. Shindo;M. Steck;P. Ugorowski;P. Walker;S. Williams;M. Winkler;H. Wollersheim;Takayuki Yamaguchi
在碎片分离器FRS的入口处产生了238 U碎片，在0.45 μs内空间分离，并在7.9 Tm（相当于约70%光速）下注入储存冷却器环ESR。用单粒子肖特基谱法获得了从铂到铀等元素范围内储存的奇异核的新的精确质量值和寿命信息。在这个实验中发现了新的同位素236 Ac、224 At、221 Po、222 Po和213 Tl。同位素被明确地识别出来，并测量了它们的质量。此外，与时间相关的数据提供了关于新核素寿命的信息。FRS-ESR装置首次实现了同位素的沿着发现和精确质量测量。结果将有助于从r-过程核的衰变产物的知识，并使现代核质量和半衰期模型的预测能力的关键测试。
238U projectile fragments have been created at the entrance of the fragment separator FRS, spatially separated in flight within 0.45 μs and injected into the storage-cooler ring ESR at 7.9 Tm corresponding to about 70% light velocity. Accurate new mass values and lifetime information of the stored exotic nuclei in the element range from platinum to uranium have been obtained with single-particle Schottky spectrometry. In this experiment the new isotopes of236Ac,224At,221Po,222Po, and213Tl were discovered. The isotopes were unambiguously identified and their masses measured. In addition, the time-correlated data have provided information on the lifetime of the new nuclides. The discovery of isotopes along with accurate mass measurement has been achieved for the first time at the FRS-ESR facility. The results will contribute to the knowledge of the decay products from the r-process nuclei and enable a crucial test of the predictive power of modern nuclear mass and half-life models.