Sequential Nature of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo stretchy="false">(</mml:mo><mml:mi>p</mml:mi><mml:mo>,</mml:mo><mml:mn>3</mml:mn><mml:mi>p</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math> Two-Proton Knockout from Neutron-Rich Nuclei
A. Frotscher, M. Gómez-Ramos, A. Obertelli, P. Doornenbal, G. Authelet, H. Baba, D. Calvet, F. Château, S. Chen, A. Corsi, A. Delbart, J.-M. Gheller, A. Giganon, A. Gillibert, T. Isobe, V. Lapoux, M. Matsushita, S. Momiyama, T. Motobayashi, M. Nııkura, H. Otsu, N. Paul, Clara Péron, A. Peyaud, E. C. Pollacco, J.-Y. Roussé, H. Sakuraï, C. Santamaria, M. Sasano, Yoshinori Shiga, Noritaka Shimizu, D. Steppenbeck, Satoshi Takeuchi, R. Taniuchi, Т. Уесака, H. Wang, K. Yoneda, Takashi Ando, T. Arıcı, A. Blazhev, F. Browne, A. M. Bruce, R. Carroll, L. X. Chung, M. L. Cortés, M. Dewald, B. Ding, Zs. Dombrádi, F. Flavigny, S. Franchoo, F. Giacoppo, M. Górska, A. Gottardo, K. Hadyńska-Klęk, Z. Korkulu, S. Koyama, Y. Kubota, A. Jungclaus, J. Lee, M. Lettmann, B. D. Linh, J. Liu, Z. Liu, C. Lizarazo, C. Louchart, R. Lozeva, K. Matsui, T. Miyazaki, K. Moschner, S. Nagamine, N. Nakatsuka, C. Nita, S. Nishimura, C.R. Nobs, L. Olivier, S. Ota, Z. Patel, Zs. Podolyák, M. Rudigier, E. Şahin, T. Saito, C. Shand, P.-A. Söderström, I. Stefan, T. Sumikama, Daisuke Suzuki, R. Orlandi, V. Vaquero, Zs. Vajta, V. Werner, K. Wimmer, J. Wu, Z. Y. Xu
Abstract
Twenty-one two-proton knockout (p,3p) cross sections were measured from neutron-rich nuclei at ∼250 MeV/nucleon in inverse kinematics. The angular distribution of the three emitted protons was determined for the first time, demonstrating that the (p,3p) kinematics are consistent with two sequential proton-proton collisions within the projectile nucleus. Ratios of (p,3p) over (p,2p) inclusive cross sections follow the trend of other many-nucleon removal reactions, further reinforcing the sequential nature of (p,3p) in neutron-rich nuclei.