The cross-section measurement for the 3H( e, e ′ K +) nn Λ reaction
2021; University of Oxford; Volume: 2022; Issue: 1 Linguagem: Inglês
10.1093/ptep/ptab158
ISSN2050-3911
AutoresKanichi Suzuki, T. Gogami, B. Pandey, K. Itabashi, S. Nagao, K. Okuyama, Shintaro Nakamura, L. Tang, D. Abrams, T. Akiyama, D. Androić, K. Aniol, C. Ayerbe Gayoso, J. Bane, S. Barcus, J. Barrow, Vincenzo Bellini, H. Bhatt, D. Bhetuwal, D. Biswas, A. Camsonne, J. Castillo Castellanos, J-P Chen, J. Chen, S. Covrig, D. Chrisman, R. Cruz-Torres, Rasel Das, E. Fuchey, K. Gnanvo, F. Garibaldi, T. Gautam, J. Gómez, P. Guèye, T. J. Hague, O. Hansen, W. Henry, F. Hauenstein, D. W. Higinbotham, C. E. Hyde-Wright, M. Kaneta, C. Keppel, T. Kutz, N. Lashley-Colthirst, S. Li, H. Liu, J. Mammei, P. Markowitz, R. E. McClellan, F. Meddi, D. Meekins, R. Michaels, M. Mihovilovič, A. Moyer, D. Nguyen, M. Nycz, V. Owen, C. Palatchi, S. Park, Tomislav Petković, S. Premathilake, P. E. Reimer, J. Reinhold, S. Riordan, V. M. Rodriguez, C. Samanta, S. N. Santiesteban, B. Sawatzky, S. Širca, K. Slifer, T. Su, Y. Tian, Yuichi Toyama, K. Uehara, G. M. Urciuoli, D. Votaw, Jeffrey F. Williamson, B. Wojtsekhowski, S. A. Wood, B. Yale, Z. Ye, J. Zhang, Xiaochao Zheng,
Tópico(s)Advanced NMR Techniques and Applications
ResumoThe small binding energy of the hypertrition leads to predictions of non-existence of bound hypernuclei for isotriplet three-body systems such as $nn\Lambda$. However, invariant mass spectroscopy at GSI has reported events that may be interpreted as the bound $nn\Lambda$ state. The $nn\Lambda$ state was sought by missing-mass spectroscopy via the $(e,e'K^+)$ reaction at Jefferson Lab's experimental Hall A. The present experiment has higher sensitivity to the $nn\Lambda$-state investigation in terms of better precision by a factor of about three. The analysis shown in this article focuses on the derivation of the reaction cross-section for the $^3{\rm{H}}(\gamma^{*},K^+)\textrm{X}$ reaction. Events that were detected in an acceptance, where a Monte Carlo simulation could reproduce the data well ($|\delta p/p| < 4\%$), were analyzed to minimize the systematic uncertainty. No significant structures were observed with the acceptance cuts, and the upper limits of the production cross-section of the $nn\Lambda$ state were obtained to be $21$ and $31~\rm{nb/sr}$ at the $90\%$ confidence level when theoretical predictions of $(-B_{\Lambda}, \Gamma) = (0.25,0.8)$ and $(0.55, 4.7)$ MeV, respectively, were assumed. The cross-section result provides valuable information for examining the existence of $nn\Lambda$.
Referência(s)