B Monteagudo, F M Marqués, J Gibelin, N A Orr, A Corsi, Y Kubota, J Casal, J Gómez-Camacho, G Authelet, H Baba, C Caesar, D Calvet, A Delbart, M Dozono, J Feng, F Flavigny, J-M Gheller, A Giganon, A Gillibert, K Hasegawa, T Isobe, Y Kanaya, S Kawakami, D Kim, Y Kiyokawa, M Kobayashi, N Kobayashi, T Kobayashi, Y Kondo, Z Korkulu, S Koyama, V Lapoux, Y Maeda, T Motobayashi, T Miyazaki, T Nakamura, N Nakatsuka, Y Nishio, A Obertelli, A Ohkura, S Ota, H Otsu, T Ozaki, V Panin, S Paschalis, E C Pollacco, S Reichert, J-Y Rousse, A T Saito, S Sakaguchi, M Sako, C Santamaria, M Sasano, H Sato, M Shikata, Y Shimizu, Y Shindo, L Stuhl, T Sumikama, Y L Sun, M Tabata, Y Togano, J Tsubota, T Uesaka, Z H Yang, J Yasuda, K Yoneda, J Zenihiro
The structure and decay of the most neutron-rich beryllium isotope, ^{16}Be, has been investigated following proton knockout from a high-energy ^{17}B beam. Two relatively narrow resonances were observed for the first time, with energies of 0.84(3) and 2.15(5) MeV above the two-neutron decay threshold and widths of 0.32(8) and 0.95(15) MeV, respectively. These were assigned to be the ground (J^{π}=0^{+}) and first excited (2^{+}) state, with E_{x}=1.31(6) MeV. The mass excess of ^{16}Be was thus deduced to be 56...
February 23, 2024: Physical Review Letters