Search for low lying dipole strength in the neutron rich nucleus 26Ne

J. Gibelin, D. Beaumel, T. Motobayashi, N. Aoi, H. Baba, Y. Blumenfeld, Z. Elekes, S. Fortier, N. Frascaria, N. Fukuda, T. Gomi, K. Ishikawa, Y. Kondo, T. Kubo, V. Lima, T. Nakamura, A. Saito, Y. Satou, E. Takeshita, S. Takeuchi & 5 others T. Teranishi, Y. Togano, A. M. Vinodkumar, Y. Yanagisawa, K. Yoshida

Research output: Contribution to journalArticle

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Abstract

Coulomb excitation of the exotic neutron-rich nucleus 26Ne on a natPb target was measured at 58 A.MeV in order to search for low-lying E1 strength above the neutron emission threshold. Data were also taken on an natAl target to estimate the nuclear contribution. The radioactive beam was produced by fragmentation of a 95 A.MeV 40Ar beam delivered by the RIKEN Research Facility. The set-up included a NaI gamma-ray array, a charged fragment hodoscope and a neutron wall. Using the invariant mass method in the 25Ne+n channel, we observe a sizable amount of E1 strength between 6 and 10 MeV. The reconstructed 26Ne angular distribution confirms its E1 nature. A reduced dipole transition probability of B (E 1) = 0.49 ± 0.16 e2fm2 is deduced. For the first time, the decay pattern of low-lying strength in a neutron-rich nucleus is obtained. The results are discussed in terms of a pygmy resonance centered around 9 MeV.

Original languageEnglish
Pages (from-to)153-158
Number of pages6
JournalNuclear Physics A
Volume788
Issue number1-4
DOIs
Publication statusPublished - May 15 2007

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dipoles
neutrons
nuclei
hodoscopes
research facilities
neutron emission
transition probabilities
fragmentation
angular distribution
fragments
gamma rays
thresholds
decay
estimates
excitation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Gibelin, J., Beaumel, D., Motobayashi, T., Aoi, N., Baba, H., Blumenfeld, Y., ... Yoshida, K. (2007). Search for low lying dipole strength in the neutron rich nucleus 26Ne. Nuclear Physics A, 788(1-4), 153-158. https://doi.org/10.1016/j.nuclphysa.2007.01.076

Search for low lying dipole strength in the neutron rich nucleus 26Ne. / Gibelin, J.; Beaumel, D.; Motobayashi, T.; Aoi, N.; Baba, H.; Blumenfeld, Y.; Elekes, Z.; Fortier, S.; Frascaria, N.; Fukuda, N.; Gomi, T.; Ishikawa, K.; Kondo, Y.; Kubo, T.; Lima, V.; Nakamura, T.; Saito, A.; Satou, Y.; Takeshita, E.; Takeuchi, S.; Teranishi, T.; Togano, Y.; Vinodkumar, A. M.; Yanagisawa, Y.; Yoshida, K.

In: Nuclear Physics A, Vol. 788, No. 1-4, 15.05.2007, p. 153-158.

Research output: Contribution to journalArticle

Gibelin, J, Beaumel, D, Motobayashi, T, Aoi, N, Baba, H, Blumenfeld, Y, Elekes, Z, Fortier, S, Frascaria, N, Fukuda, N, Gomi, T, Ishikawa, K, Kondo, Y, Kubo, T, Lima, V, Nakamura, T, Saito, A, Satou, Y, Takeshita, E, Takeuchi, S, Teranishi, T, Togano, Y, Vinodkumar, AM, Yanagisawa, Y & Yoshida, K 2007, 'Search for low lying dipole strength in the neutron rich nucleus 26Ne', Nuclear Physics A, vol. 788, no. 1-4, pp. 153-158. https://doi.org/10.1016/j.nuclphysa.2007.01.076
Gibelin J, Beaumel D, Motobayashi T, Aoi N, Baba H, Blumenfeld Y et al. Search for low lying dipole strength in the neutron rich nucleus 26Ne. Nuclear Physics A. 2007 May 15;788(1-4):153-158. https://doi.org/10.1016/j.nuclphysa.2007.01.076
Gibelin, J. ; Beaumel, D. ; Motobayashi, T. ; Aoi, N. ; Baba, H. ; Blumenfeld, Y. ; Elekes, Z. ; Fortier, S. ; Frascaria, N. ; Fukuda, N. ; Gomi, T. ; Ishikawa, K. ; Kondo, Y. ; Kubo, T. ; Lima, V. ; Nakamura, T. ; Saito, A. ; Satou, Y. ; Takeshita, E. ; Takeuchi, S. ; Teranishi, T. ; Togano, Y. ; Vinodkumar, A. M. ; Yanagisawa, Y. ; Yoshida, K. / Search for low lying dipole strength in the neutron rich nucleus 26Ne. In: Nuclear Physics A. 2007 ; Vol. 788, No. 1-4. pp. 153-158.
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AU - Motobayashi, T.

AU - Aoi, N.

AU - Baba, H.

AU - Blumenfeld, Y.

AU - Elekes, Z.

AU - Fortier, S.

AU - Frascaria, N.

AU - Fukuda, N.

AU - Gomi, T.

AU - Ishikawa, K.

AU - Kondo, Y.

AU - Kubo, T.

AU - Lima, V.

AU - Nakamura, T.

AU - Saito, A.

AU - Satou, Y.

AU - Takeshita, E.

AU - Takeuchi, S.

AU - Teranishi, T.

AU - Togano, Y.

AU - Vinodkumar, A. M.

AU - Yanagisawa, Y.

AU - Yoshida, K.

PY - 2007/5/15

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N2 - Coulomb excitation of the exotic neutron-rich nucleus 26Ne on a natPb target was measured at 58 A.MeV in order to search for low-lying E1 strength above the neutron emission threshold. Data were also taken on an natAl target to estimate the nuclear contribution. The radioactive beam was produced by fragmentation of a 95 A.MeV 40Ar beam delivered by the RIKEN Research Facility. The set-up included a NaI gamma-ray array, a charged fragment hodoscope and a neutron wall. Using the invariant mass method in the 25Ne+n channel, we observe a sizable amount of E1 strength between 6 and 10 MeV. The reconstructed 26Ne angular distribution confirms its E1 nature. A reduced dipole transition probability of B (E 1) = 0.49 ± 0.16 e2fm2 is deduced. For the first time, the decay pattern of low-lying strength in a neutron-rich nucleus is obtained. The results are discussed in terms of a pygmy resonance centered around 9 MeV.

AB - Coulomb excitation of the exotic neutron-rich nucleus 26Ne on a natPb target was measured at 58 A.MeV in order to search for low-lying E1 strength above the neutron emission threshold. Data were also taken on an natAl target to estimate the nuclear contribution. The radioactive beam was produced by fragmentation of a 95 A.MeV 40Ar beam delivered by the RIKEN Research Facility. The set-up included a NaI gamma-ray array, a charged fragment hodoscope and a neutron wall. Using the invariant mass method in the 25Ne+n channel, we observe a sizable amount of E1 strength between 6 and 10 MeV. The reconstructed 26Ne angular distribution confirms its E1 nature. A reduced dipole transition probability of B (E 1) = 0.49 ± 0.16 e2fm2 is deduced. For the first time, the decay pattern of low-lying strength in a neutron-rich nucleus is obtained. The results are discussed in terms of a pygmy resonance centered around 9 MeV.

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