Experimental investigations of the hypernucleus $_Λ^4$H
Achenbach, P.; Schulz, F.; Aulenbacher, S.; Beričič, J.; Bleser, S.; Böhm, R.; Bosnar, D.; Correa, L.; Distler, M.O.; Esser, A.; Fonvieille, H.; Friščić, I.; Fujii, Y.; Fujita, M.; Gogami, T.; Kanda, H.; Kaneta, M.; Kegel, S.; Kohl, Y.; Kusaka, W.; Margaryan, A.; Merkel, H.; Mihovilovič, M.; Müller, U.; Nagao, S.; Nakamura, S.N.; Pochodzalla, J.; Sanchez Lorente, A.; Schlimme, B.S.; Schoth, M.; Sfienti, C.; Širca, S.; Steinen, M.; Takahashi, Y.; Tang, L.; Thiel, M.; Tsukada, K.; Tyukin, A.; Weber, A.
Negatively charged pions from two-body decays of stopped _Lambda^4H hypernuclei were studied in 2012 at the Mainz Microtron MAMI, Germany. The momenta of the decay-pions were measured with unprecedented precision by using high-resolution magnetic spectrometers. A challenge of the experiment was the tagging of kaons from associated K^+∧ production off a Be target at very forward angles. In the year 2014, this experiment was continued with a better control of the systematic uncertainties, with better suppression of coincident and random background, improved particle identification, and with higher luminosities. Another key point of the progress was the improvement in the absolute momentum calibration of the magnetic spectrometers.
Date of Appearance
Mainz Linac; resolution; magnetic spectrometer; hydrogen; beryllium: target; microtron; suppression; particle identification; luminosity: high; background: random; tagged beam; Lambda: hypernucleus; pi-; pi: decay; momentum: calibration; K; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
EPJ Web Conf.; 21st International Conference on Few-Body Problems in Physics; https://hal.archives-ouvertes.fr/hal-01555024; 21st International Conference on Few-Body Problems in Physics, May 2015, Chicago, United States. EPJ Web Conf., 113, pp.07001, 2016, 〈10.1051/epjconf/201611307001〉