Halo Structure of the Island of Inversion Nucleus {sup 31}Ne

Journal Article · Thu Dec 31 00:00:00 EST 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.103.262501· OSTI ID:21370929

Nakamura, T; Kobayashi, N; Kondo, Y; Satou, Y; Deguchi, S; Kawada, Y; Tanaka, K N; Tanaka, N ^[1]; Aoi, N; Baba, H; Fukuda, N; Inabe, N; Ishihara, M; Kameda, D; Kubo, T; Kusaka, K; Motobayashi, T; Ohnishi, T; Ohtake, M; Otsu, H ^[2]

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1. Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551 (Japan)
2. RIKEN Nishina Center, Hirosawa 2-1, Wako, Saitama 351-0198 (Japan)

The cross sections for single-neutron removal from the very neutron-rich nucleus {sup 31}Ne on Pb and C targets have been measured at 230 MeV/nucleon using the RIBF facility at RIKEN. The deduced large Coulomb breakup cross section of 540(70) mb is indicative of a soft E1 excitation. Comparison with direct-breakup model calculations suggests that the valence neutron of {sup 31}Ne occupies a low-l orbital (most probably 2p{sub 3/2}) with a small separation energy (S{sub n} < or approx. 0.8 MeV), instead of being predominantly in the 1f{sub 7/2} orbital as expected from the conventional shell ordering. These findings suggest that {sup 31}Ne is the heaviest halo system known.

• OSTI ID: 21370929
• Journal Information: Physical Review Letters, Vol. 103, Issue 26; Other Information: DOI: 10.1103/PhysRevLett.103.262501; (c) 2009 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BINDING ENERGY
CROSS SECTIONS
EXCITATION
HEAVY ION REACTIONS
MASS NUMBER
MEV RANGE 100-1000
NEON 31
NEUTRON-RICH ISOTOPES
NEUTRONS
NUCLEAR HALOS
SHELL MODELS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
FERMIONS
HADRONS
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MEV RANGE
MILLISECONDS LIVING RADIOISOTOPES
NEON ISOTOPES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
RADIOISOTOPES