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One-neutron removal from Ne29: Defining the lower limits of the island of inversion

Kobayashi, N, Nakamura, T, Kondo, Y, Tostevin, JA, Aoi, N, Baba, H, Barthelemy, R, Famiano, MA, Fukuda, N, Inabe, N, Ishihara, M, Kanungo, R, Kim, S, Kubo, T, Lee, GS, Lee, HS, Matsushita, M, Motobayashi, T, Ohnishi, T, Orr, NA, Otsu, H, Sako, T, Sakurai, H, Satou, Y, Sumikama, T, Takeda, H, Takeuchi, S, Tanaka, R, Togano, Y and Yoneda, K (2016) One-neutron removal from Ne29: Defining the lower limits of the island of inversion Physical Review C: Nuclear Physics, 93, 014613.

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Abstract

Background: Very neutron-rich isotopes, including Ne30-32, in the vicinity of N=20 are known to exhibit ground states dominated by fp-shell intruder configurations: the “island of inversion.” Systematics for the Ne-isotopic chain suggest that such configurations may be in strong competition with normal shell-model configurations in the ground state of Ne29. Purpose: A determination of the structure of Ne29 is thus important to delineate the extent of the island of inversion and better understand structural evolution in neutron-rich Ne isotopes. This is accomplished here through a combined investigation of nuclear and Coulomb-induced one-neutron removal reactions. Method: Cross sections for one-neutron removal on carbon and lead targets and the parallel momentum distribution of the Ne28 residues from the carbon target are measured at around 240 MeV/nucleon. The measurements are compared with reaction calculations combined with spectroscopic information from SDPF-M shell-model wave functions. Results: The deduced width of the inclusive parallel momentum distribution, 98(12) MeV/c (FWHM), suggests that the ground state of Ne29 has a spin parity of 3/2-. Detailed comparisons of the measured inclusive and partial cross sections of the two targets and the parallel momentum distribution of the carbon target with reaction calculations, combined with spectroscopic information from large-scale shell-model calculations, are all consistent with a 3/2- spin-parity assignment. Conclusions: The results indicate that Ne29 lies within the island of inversion and that the ground state of Ne29 is dominated by a Ne28(0+1)xp3/2 neutron configuration. Combined with recently measured interaction cross sections, it is concluded that Ne29 may exhibit a moderately developed halo-like distribution

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Kobayashi, NUNSPECIFIEDUNSPECIFIED
Nakamura, TUNSPECIFIEDUNSPECIFIED
Kondo, YUNSPECIFIEDUNSPECIFIED
Tostevin, JAUNSPECIFIEDUNSPECIFIED
Aoi, NUNSPECIFIEDUNSPECIFIED
Baba, HUNSPECIFIEDUNSPECIFIED
Barthelemy, RUNSPECIFIEDUNSPECIFIED
Famiano, MAUNSPECIFIEDUNSPECIFIED
Fukuda, NUNSPECIFIEDUNSPECIFIED
Inabe, NUNSPECIFIEDUNSPECIFIED
Ishihara, MUNSPECIFIEDUNSPECIFIED
Kanungo, RUNSPECIFIEDUNSPECIFIED
Kim, SUNSPECIFIEDUNSPECIFIED
Kubo, TUNSPECIFIEDUNSPECIFIED
Lee, GSUNSPECIFIEDUNSPECIFIED
Lee, HSUNSPECIFIEDUNSPECIFIED
Matsushita, MUNSPECIFIEDUNSPECIFIED
Motobayashi, TUNSPECIFIEDUNSPECIFIED
Ohnishi, TUNSPECIFIEDUNSPECIFIED
Orr, NAUNSPECIFIEDUNSPECIFIED
Otsu, HUNSPECIFIEDUNSPECIFIED
Sako, TUNSPECIFIEDUNSPECIFIED
Sakurai, HUNSPECIFIEDUNSPECIFIED
Satou, YUNSPECIFIEDUNSPECIFIED
Sumikama, TUNSPECIFIEDUNSPECIFIED
Takeda, HUNSPECIFIEDUNSPECIFIED
Takeuchi, SUNSPECIFIEDUNSPECIFIED
Tanaka, RUNSPECIFIEDUNSPECIFIED
Togano, YUNSPECIFIEDUNSPECIFIED
Yoneda, KUNSPECIFIEDUNSPECIFIED
Date : 20 January 2016
Identification Number : 10.1103/PhysRevC.93.014613
Related URLs :
Additional Information : Copyright 2016 American Physical Society
Depositing User : Symplectic Elements
Date Deposited : 02 Feb 2016 17:43
Last Modified : 02 Feb 2016 17:43
URI: http://epubs.surrey.ac.uk/id/eprint/809821

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