It is a well-known fact that a cluster of nucleons can be formed in the interior of an atomic nucleus, and such clusters may occupy molecular-like orbitals, showing characteristics similar to normal molecules consisting of atoms. Chemical molecules having a linear alignment are commonly seen in nature, such as carbon dioxide. A similar linear alignment of the nuclear clusters, referred to as linear-chain cluster state (LCCS), has been studied since the 1950s, however, up to now there is no clear experimental evidence demonstrating the existence of such a state. Recently, it was proposed that an excess of neutrons may offer just such a stabilizing mechanism, revitalizing interest in the nuclear LCCS, specifically with predictions for their emergence in neutron-rich carbon isotopes. Here we present the experimental observation of α -cluster states in the radioactive 14 C nucleus. Using the Be10+α resonant scattering method with a radioactive beam, we observed a series of levels which completely agree with theoretically predicted levels having an explicit linear-chain cluster configuration. We regard this as the first strong indication of the linear-chain clustered nucleus.
{ "license": [ { "url": "http://creativecommons.org/licenses/by/3.0/", "license": "CC-BY-3.0" } ], "copyright": [ { "statement": "The Author(s)" } ], "control_number": "18452", "_oai": { "updated": "2018-04-18T12:57:29Z", "id": "oai:repo.scoap3.org:18452", "sets": [ "PLB" ] }, "authors": [ { "raw_name": "Yamaguchi, H.", "affiliations": [ { "country": "Japan", "value": "Center for Nuclear Study (CNS), University of Tokyo, RIKEN campus, 2-1 Hirosawa, Saitama, Wako, 351-0198, Japan" } ], "surname": "Yamaguchi", "given_names": "H.", "full_name": "Yamaguchi, H." }, { "raw_name": "Kahl, D.", "affiliations": [ { "country": "Japan", "value": "Center for Nuclear Study (CNS), University of Tokyo, RIKEN campus, 2-1 Hirosawa, Saitama, Wako, 351-0198, Japan" }, { "country": "UK", "value": "School of Physics and Astronomy, the University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3BF, UK" } ], "surname": "Kahl", "given_names": "D.", "full_name": "Kahl, D." }, { "raw_name": "Hayakawa, S.", "affiliations": [ { "country": "Japan", "value": "Center for Nuclear Study (CNS), University of Tokyo, RIKEN campus, 2-1 Hirosawa, Saitama, Wako, 351-0198, Japan" } ], "surname": "Hayakawa", "given_names": "S.", "full_name": "Hayakawa, S." }, { "raw_name": "Sakaguchi, Y.", "affiliations": [ { "country": "Japan", "value": "Center for Nuclear Study (CNS), University of Tokyo, RIKEN campus, 2-1 Hirosawa, Saitama, Wako, 351-0198, Japan" } ], "surname": "Sakaguchi", "given_names": "Y.", "full_name": "Sakaguchi, Y." }, { "raw_name": "Abe, K.", "affiliations": [ { "country": "Japan", "value": "Center for Nuclear Study (CNS), University of Tokyo, RIKEN campus, 2-1 Hirosawa, Saitama, Wako, 351-0198, Japan" } ], "surname": "Abe", "given_names": "K.", "full_name": "Abe, K." }, { "raw_name": "Nakao, T.", "affiliations": [ { "country": "Japan", "value": "Center for Nuclear Study (CNS), University of Tokyo, RIKEN campus, 2-1 Hirosawa, Saitama, Wako, 351-0198, Japan" }, { "country": "Japan", "value": "Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki, Tokai, 319-1195, Japan" } ], "surname": "Nakao", "given_names": "T.", "full_name": "Nakao, T." }, { "raw_name": "Suhara, T.", "affiliations": [ { "country": "Japan", "value": "Matsue College of Technology, Shimane 690-8518, Matsue, Japan" } ], "surname": "Suhara", "given_names": "T.", "full_name": "Suhara, T." }, { "raw_name": "Iwasa, N.", "affiliations": [ { "country": "Japan", "value": "Department of Physics, Tohoku University, Aoba, Sendai, Miyagi, 980-8578, Japan" } ], "surname": "Iwasa", "given_names": "N.", "full_name": "Iwasa, N." }, { "raw_name": "Kim, A.", "affiliations": [ { "country": "South Korea", "value": "Department of Physics, Sungkyunkwan University, 2066 Seobu-ro, Suwon, Jangan-gu, Republic of Korea" }, { "country": "South Korea", "value": "Department of Physics, Ewha Womans University, Seoul, 120-750, Republic of Korea" } ], "surname": "Kim", "given_names": "A.", "full_name": "Kim, A." }, { "raw_name": "Kim, D.H.", "affiliations": [ { "country": "South Korea", "value": "Department of Physics, Ewha Womans University, Seoul, 120-750, Republic of Korea" } ], "surname": "Kim", "given_names": "D.H.", "full_name": "Kim, D.H." }, { "raw_name": "Cha, S.M.", "affiliations": [ { "country": "South Korea", "value": "Department of Physics, Sungkyunkwan University, 2066 Seobu-ro, Suwon, Jangan-gu, Republic of Korea" } ], "surname": "Cha", "given_names": "S.M.", "full_name": "Cha, S.M." }, { "raw_name": "Kwag, M.S.", "affiliations": [ { "country": "South Korea", "value": "Department of Physics, Sungkyunkwan University, 2066 Seobu-ro, Suwon, Jangan-gu, Republic of Korea" } ], "surname": "Kwag", "given_names": "M.S.", "full_name": "Kwag, M.S." }, { "raw_name": "Lee, J.H.", "affiliations": [ { "country": "South Korea", "value": "Department of Physics, Sungkyunkwan University, 2066 Seobu-ro, Suwon, Jangan-gu, Republic of Korea" } ], "surname": "Lee", "given_names": "J.H.", "full_name": "Lee, J.H." }, { "raw_name": "Lee, E.J.", "affiliations": [ { "country": "South Korea", "value": "Department of Physics, Sungkyunkwan University, 2066 Seobu-ro, Suwon, Jangan-gu, Republic of Korea" } ], "surname": "Lee", "given_names": "E.J.", "full_name": "Lee, E.J." }, { "raw_name": "Chae, K.Y.", "affiliations": [ { "country": "South Korea", "value": "Department of Physics, Sungkyunkwan University, 2066 Seobu-ro, Suwon, Jangan-gu, Republic of Korea" } ], "surname": "Chae", "given_names": "K.Y.", "full_name": "Chae, K.Y." }, { "raw_name": "Wakabayashi, Y.", "affiliations": [ { "country": "Japan", "value": "The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Saitama, Wako, 351-0198, Japan" } ], "surname": "Wakabayashi", "given_names": "Y.", "full_name": "Wakabayashi, Y." }, { "raw_name": "Imai, N.", "affiliations": [ { "country": "Japan", "value": "Center for Nuclear Study (CNS), University of Tokyo, RIKEN campus, 2-1 Hirosawa, Saitama, Wako, 351-0198, Japan" } ], "surname": "Imai", "given_names": "N.", "full_name": "Imai, N." }, { "raw_name": "Kitamura, N.", "affiliations": [ { "country": "Japan", "value": "Center for Nuclear Study (CNS), University of Tokyo, RIKEN campus, 2-1 Hirosawa, Saitama, Wako, 351-0198, Japan" } ], "surname": "Kitamura", "given_names": "N.", "full_name": "Kitamura, N." }, { "raw_name": "Lee, P.", "affiliations": [ { "country": "South Korea", "value": "Department of Physics, Chung-Ang University, Seoul, 156-756, Republic of Korea" } ], "surname": "Lee", "given_names": "P.", "full_name": "Lee, P." }, { "raw_name": "Moon, J.Y.", "affiliations": [ { "country": "South Korea", "value": "Institute for Basic Science, 70, Yuseong-daero 1689-gil, Daejeon, Yuseong-gu, 305-811, Republic of Korea" }, { "country": "Japan", "value": "Wako Nuclear Science Center (WNSC), KEK, 2-1 Hirosawa, Saitama, Wako, 351-0198, Japan" } ], "surname": "Moon", "given_names": "J.Y.", "full_name": "Moon, J.Y." }, { "raw_name": "Lee, K.B.", "affiliations": [ { "country": "South Korea", "value": "Institute for Basic Science, 70, Yuseong-daero 1689-gil, Daejeon, Yuseong-gu, 305-811, Republic of Korea" } ], "surname": "Lee", "given_names": "K.B.", "full_name": "Lee, K.B." }, { "raw_name": "Akers, C.", "affiliations": [ { "country": "South Korea", "value": "Institute for Basic Science, 70, Yuseong-daero 1689-gil, Daejeon, Yuseong-gu, 305-811, Republic of Korea" } ], "surname": "Akers", "given_names": "C.", "full_name": "Akers, C." }, { "raw_name": "Jung, H.S.", "affiliations": [ { "country": "Japan", "value": "Wako Nuclear Science Center (WNSC), KEK, 2-1 Hirosawa, Saitama, Wako, 351-0198, Japan" } ], "surname": "Jung", "given_names": "H.S.", "full_name": "Jung, H.S." }, { "raw_name": "Duy, N.N.", "affiliations": [ { "country": "Vietnam", "value": "Dong Nai University, Le Quy Don Street, Tan Hiep Ward, Bien Hoa City, Dong Nai, Viet Nam" }, { "country": "Vietnam", "value": "Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi, Viet Nam" } ], "surname": "Duy", "given_names": "N.N.", "full_name": "Duy, N.N." }, { "raw_name": "Khiem, L.H.", "affiliations": [ { "country": "Vietnam", "value": "Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi, Viet Nam" } ], "surname": "Khiem", "given_names": "L.H.", "full_name": "Khiem, L.H." }, { "raw_name": "Lee, C.S.", "affiliations": [ { "country": "South Korea", "value": "Department of Physics, Chung-Ang University, Seoul, 156-756, Republic of Korea" } ], "surname": "Lee", "given_names": "C.S.", "full_name": "Lee, C.S." } ], "_files": [ { "checksum": "md5:40a62d1f508e0b411f43c39b8847b779", "filetype": "xml", "bucket": "76038f6b-e4fa-4f68-bc61-4a018399941f", "version_id": "3450df93-325a-4613-b375-4cfceee4a793", "key": "10.1016/j.physletb.2016.12.050.xml", "size": 136995 }, { "checksum": "md5:876920d139ca94cfcfc49cd5942503f5", "filetype": "pdf", "bucket": 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showing characteristics similar to normal molecules consisting of atoms. Chemical molecules having a linear alignment are commonly seen in nature, such as carbon dioxide. A similar linear alignment of the nuclear clusters, referred to as linear-chain cluster state (LCCS), has been studied since the 1950s, however, up to now there is no clear experimental evidence demonstrating the existence of such a state. Recently, it was proposed that an excess of neutrons may offer just such a stabilizing mechanism, revitalizing interest in the nuclear LCCS, specifically with predictions for their emergence in neutron-rich carbon isotopes. Here we present the experimental observation of \u03b1 -cluster states in the radioactive 14 C nucleus. Using the Be10+\u03b1 resonant scattering method with a radioactive beam, we observed a series of levels which completely agree with theoretically predicted levels having an explicit linear-chain cluster configuration. We regard this as the first strong indication of the linear-chain clustered nucleus." } ], "imprints": [ { "date": "2016-12-28", "publisher": "Elsevier" } ], "acquisition_source": { "date": "2016-12-28T00:00:00", "source": "Elsevier", "method": "scoap3", "submission_number": "37254efa430511e898b102163e01809a" } }