High precision momentum calibration of the magnetic spectrometers at MAMI for hypernuclear binding energy determination

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• 作者：A. Margaryan^a ; ^{mat@mail.yerphi.am} ; J.R.M. Annand^d ; ^{john.annand@glasgow.ac.uk} ; P. Achenbach^b ; R. Ajvazyan^a ; H. Elbakyan^a ; R. Montgomery^d ; S.N. Nakamura^c ; J. Pochodzalla^b ; F. Schulz^b ; Y. Toyama^c ; S. Zhamkochyan^a
• 关键词：Magnetic spectrometers ; Cherenkov detectors ; Radio Frequency Photomultiplier ; Absolute calibration ; Time of flight
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2017
• 出版时间：21 February 2017
• 年：2017
• 卷：846
• 期：Complete
• 页码：98-105
• 全文大小：1494 K
• 卷排序：846

文摘

We propose a new method for absolute momentum calibration of magnetic spectrometers used in nuclear physics, using the time-of-flight (TOF) differences of pairs of particles with different masses. In cases where the flight path is not known, a calibration can be determined by using the TOF differences of two pair combinations of three particles. A Cherenkov detector, read out by a radio frequency photomultiplier tube, is considered as the high-resolution and highly stable TOF detector. By means of Monte Carlo simulations it is demonstrated that the magnetic spectrometers at the MAMI electron-scattering facility can be calibrated absolutely with an accuracy δp/p≤10−4δp/p≤10−4, which will be crucial for high precision determination of hypernuclear masses.