Decay properties of isomeric states in radium isotopes close to N = 126期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Decay properties of isomeric states in radium isotopes close to N = 126

Authors:	Email author" target="_blank">F?P?He?berger Email author S?Hofmann I?Kojouharov D?Ackermann

Institution:	(1) Gesellschaft für Schwerionenforschung mbH, D-64220 Darmstadt, Germany;(2) Institut für Physik, Johannes Gutenberg - Universität Mainz, D-55099 Mainz, Germany

Abstract:	Isomeric states in ^210-215Ra have been populated by the decay of the compound nuclei ^216,220Ra produced in irradiations of ^204,208Pb with ¹²C at $E_{\rm {lab}} = (68-136)$ MeV. Published values for $\gamma$ -ray energies and half-lives were confirmed for $^{212{\rm m}-215{\rm m}}$ Ra. Our data for $^{210{\rm m}}$ Ra agree with the $\gamma$ -energies and the half-life measured at the RITU separator, University of Jyväskylä (Finland). Its decay pattern is complex. Two series of $\gamma$ -rays of $E_{\gamma} = 96.7, 774.6, 578.0, 604.5$ keV and $E_{\gamma} = 96.7, 602.1, 750.5, 604.5$ keV were observed. A half-life of $(2.36 \pm 0.04)$ s was measured. The isomeric state is attributed to an 8⁺ state at E ^* = 2053.8keV. A previously unknown isomeric state was assigned to $^{211{\rm m}}$ Ra. It has a half-life of ( $4.0\pm0.5$ ) ${\mu s}$ and it decays by emission of $\gamma$ -rays with energies of 396.1keV and 802.0keV. It is attributed to a 13/2⁺ state at E ^* = 1198.1 keV.PACS: 23.60. + e $\alpha$ decay - 27.90. + b $220\leq A$

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