In-gas-cell laser ionization studies of plutonium isotopes at IGISOL

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• 作者：I. Pohjalainen^a ; ^{ilkka.pohjalainen@jyu.fi" class="auth_mail" title="E-mail the corresponding author} ; I.D. Moore^a ; ^{iain.d.moore@jyu.fi" class="auth_mail" title="E-mail the corresponding author} ; T. Kron^b ; S. Raeder^c ; ^d ; V. Sonnenschein^e ; H. Tomita^e ; N. Trautmann^f ; A. Voss^a ; K. Wendt^b
• 关键词：Resonance laser ionization ; Gas phase chemistry ; Gas cell ; Plutonium
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2016
• 出版时间：1 June 2016
• 年：2016
• 卷：376
• 期：Complete
• 页码：233-239
• 全文大小：823 K

文摘

In-gas-cell resonance laser ionization has been performed on long-lived isotopes of Pu at the IGISOL facility, Jyväskylä. This initiates a new programme of research towards high-resolution optical spectroscopy of heavy actinide elements which can be produced in sufficient quantities at research reactors and transported to facilities elsewhere. In this work a new gas cell has been constructed for fast extraction of laser-ionized elements. Samples of ^{238–240,242}Pu and ²⁴⁴Pu have been evaporated from Ta filaments, laser ionized, mass separated and delivered to the collinear laser spectroscopy station. Here we report on the performance of the gas cell through studies of the mass spectra obtained in helium and argon, before and after the radiofrequency quadrupole cooler-buncher. This provides valuable insight into the gas phase chemistry exhibited by Pu, which has been additionally supported by measurements of ion time profiles. The resulting monoatomic yields are sufficient for collinear laser spectroscopy. A gamma-ray spectroscopic analysis of the Pu samples shows a good agreement with the assay provided by the Mainz Nuclear Chemistry department.