Instrumentation for measurement of in-flight annihilations of 130 keV antiprotons on thin target foils

详细信息    查看全文

• 作者：K. Todoroki^a ; ¹ ; D. Barna^a ; ² ; R.S. Hayano^a ; H. Aghai-Khozani^b ; A. Só ; té ; r^b ; M. Corradini^c ; ^d ; M. Leali^c ; ^d ; E. Lodi-Rizzini^c ; ^d ; V. Mascagna^c ; ^d ; L. Venturelli^c ; ^d ; V. Prest^e ; ^f ; L. Vallazza^g ; D. De Salvador^h ; ⁱ ; M. Hori^a ; ^b ; ^{Masaki.Hori@mpq.mpg.de" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Antiproton ; Annihilation ; Nuclear cross section
• 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：1 November 2016
• 年：2016
• 卷：835
• 期：Complete
• 页码：110-118
• 全文大小：973 K

文摘

We describe the instrumentation for an experiment to measure the cross sections of antiprotons with kinetic energies of 130±10 keV annihilating on carbon, palladium, and platinum target foils of sub-100 nm thicknesses. A 120 ns long pulsed beam containing 10⁵–10⁶${10}^5–{10}^6$ antiprotons was allowed to traverse the foils, and the signal annihilations that resulted from this were isolated using a time-of-flight method. Backgrounds arose from Rutherford scattering of the antiprotons off the target foils, their annihilations in the target chamber walls, and π→μ→e$\pi \to \mu \to e$ decay of the charged pions that emerged from the annihilations. Some antiprotons slowed down and annihilated in the contamination on the target surfaces. This reduced the signal-to-background ratio of the measurement.