The TRIple PLunger for EXotic beams TRIPLEX for excited-state lifetime measurement studies on rare isotopes

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• 作者：H. Iwasaki^a ; ^b ; ^{iwasaki@nscl.msu.edu" class="auth_mail" title="E-mail the corresponding author} ; A. Dewald^c ; T. Braunroth^c ; C. Fransen^c ; D. Smalley^a ; A. Lemasson^a ; ^d ; C. Morse^a ; ^b ; K. Whitmore^a ; ^b ; C. Loelius^a ; ^b
• 关键词：Plunger ; Lifetimes ; Recoil distance Doppler-shift method ; Rare isotope beams
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：11 January 2016
• 年：2016
• 卷：806
• 期：Complete
• 页码：123-131
• 全文大小：1960 K

文摘

A new device, the TRIple PLunger for EXotic beams (TRIPLEX), has been developed for lifetime measurement studies with rare isotope beams. This plunger device holds up to three metal foils in the beam path and facilitates the recoil distance Doppler-shift technique to measure lifetimes of nuclear excited states in the range of 1 ps to 1 ns. The unique design allows independent movement of the target and the second degrader with respect to a fixed first degrader in between, enabling advanced experimental approaches, such as the differential recoil distance method and the double recoil distance method. The design and control of the device are presented in this paper, together with simulated performances of the new applications. As an example of actual experiments, results from the lifetime measurement of the neutron-rich ¹⁷C isotope performed at the National Superconducting Cyclotron Laboratory are shown.