One-neutron knockout reaction of 17C on a hydrogen target at 70 MeV/nucleon

• Published in: Physics letters. B Vol. 728; pp. 462 - 466
• Main Authors: Satou, Y., Hwang, J.W., Kim, S., Tshoo, K., Choi, S., Nakamura, T., Kondo, Y., Matsui, N., Hashimoto, Y., Nakabayashi, T., Okumura, T., Shinohara, M., Fukuda, N., Sugimoto, T., Otsu, H., Togano, Y., Motobayashi, T., Sakurai, H., Yanagisawa, Y., Aoi, N., Takeuchi, S., Gomi, T., Ishihara, M., Kawai, S., Ong, H.J., Onishi, T.K., Shimoura, S., Tamaki, M., Kobayashi, T., Matsuda, Y., Endo, N., Kitayama, M.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2014
• Subjects: Cross sections; Elementary particles; Invariants; Mathematical models; Nucleons; Shells; Spectroscopy; Thresholds
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2013.12.024

First experimental evidence of the population of the first 2− state in 16C above the neutron threshold is obtained by neutron knockout from 17C on a hydrogen target. The invariant mass method combined with in-beam γ-ray detection is used to locate the state at 5.45(1) MeV. Comparison of its populating cross section and parallel momentum distribution with a Glauber model calculation utilizing the shell-model spectroscopic factor confirms the core-neutron removal nature of this state. Additionally, a previously known unbound state at 6.11 MeV and a new state at 6.28(2) MeV are observed. The position of the first 2− state, which belongs to a member of the lowest-lying p–sd cross shell transition, is reasonably well described by the shell-model calculation using the WBT interaction.