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arXiv · 1902.03075

Decay pion spectroscopy: a new approach

A. Margaryan·R. Ajvazyan·N. Grigoryan·V. Kakoyan·V. Khacatryan·H. Vardanyan·S. Zhamkochyan·P. Achenbach·J. Pochodzalla·S. N. Nakamura·S. Nagao·Y. Toyama·J. R. M. Annand·K. Livingston·R. Montgomery
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Abstract

We propose a new experiment for decay pion spectroscopy of light hypernuclei at electron- and proton-beam facilities, using the recoil distance technique for separation of produced hypernuclei and a magnetic spectrometer for precise measurement of the decay pion momentum. Low-pressure MWPCs are advocated for low-energy recoil detection as they provide position and time information and are highly insensitive to gamma-ray and electron background. The position and timing characteristics of such a recoil detector were studied using ~5 MeV α-particles. By using the present proposed approach the rate of the detected hypernuclei can be increased by one-to-two orders of magnitude compared to a recent experiment carried out at the MAMI electron accelerator in Mainz. The possibility of realizing a high luminosity decay pion spectroscopy experiment with proton beams is also discussed.

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A. Margaryan, R. Ajvazyan, N. Grigoryan, V. Kakoyan, V. Khacatryan, H. Vardanyan, S. Zhamkochyan, P. Achenbach, J. Pochodzalla, S. N. Nakamura, S. Nagao, Y. Toyama, J. R. M. Annand, K. Livingston, R. Montgomery. 2019-02-26. Decay pion spectroscopy: a new approach. https://doi.org/10.1016/j.nima.2019.04.063

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