Low-lying non-normal parity states in 8B measured by proton elastic scattering on 7Be

H. Yamaguchi; Y. Wakabayashi; S. Kubono; G. Amadio; H. Fujikawa; T. Teranishi; A. Saito; J. J. He; S. Nishimura; Y. Togano; Y. K. Kwon; M. Niikura; N. Iwasa; K. Inafuku; L. H. Khiem

doi:10.1016/j.physletb.2009.01.033

Low-lying non-normal parity states in ⁸B measured by proton elastic scattering on ⁷Be

H. Yamaguchi, Y. Wakabayashi, S. Kubono, G. Amadio, H. Fujikawa, T. Teranishi, A. Saito, J. J. He, S. Nishimura, Y. Togano, Y. K. Kwon, M. Niikura, N. Iwasa, K. Inafuku, L. H. Khiem

SCI - Physics

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

A new measurement of proton resonance scattering on ⁷Be was performed up to the center-of-mass energy of 6.7 MeV using the low-energy RI beam facility CRIB (CNS Radioactive Ion Beam separator) at the Center for Nuclear Study of the University of Tokyo. The excitation function of ⁷Be + p elastic scattering above 3.5 MeV was measured successfully for the first time, providing important information about the resonance structure of the ⁸B nucleus. The resonances are related to the reaction rate of ⁷Be(p, γ)⁸B, which is the key reaction in solar ⁸B neutrino production. Evidence for the presence of two negative parity states is presented. One of them is a 2^- state observed as a broad s-wave resonance, the existence of which had been questionable. Its possible effects on the determination of the astrophysical S-factor of ⁷Be(p, γ)⁸B at solar energy are discussed. The other state had not been observed in previous measurements, and its spin and parity were determined as 1^-.

Original language	English
Pages (from-to)	230-234
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	672
Issue number	3
DOIs	https://doi.org/10.1016/j.physletb.2009.01.033
Publication status	Published - 2009 Feb 23

Keywords

Be(p, γ)B
Proton resonance scattering
RI beam
Solar neutrino

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1016/j.physletb.2009.01.033

Cite this

Yamaguchi, H., Wakabayashi, Y., Kubono, S., Amadio, G., Fujikawa, H., Teranishi, T., Saito, A., He, J. J., Nishimura, S., Togano, Y., Kwon, Y. K., Niikura, M., Iwasa, N., Inafuku, K., & Khiem, L. H. (2009). Low-lying non-normal parity states in ⁸B measured by proton elastic scattering on ⁷Be. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 672(3), 230-234. https://doi.org/10.1016/j.physletb.2009.01.033

Yamaguchi, H, Wakabayashi, Y, Kubono, S, Amadio, G, Fujikawa, H, Teranishi, T, Saito, A, He, JJ, Nishimura, S, Togano, Y, Kwon, YK, Niikura, M, Iwasa, N, Inafuku, K & Khiem, LH 2009, 'Low-lying non-normal parity states in ⁸B measured by proton elastic scattering on ⁷Be', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 672, no. 3, pp. 230-234. https://doi.org/10.1016/j.physletb.2009.01.033

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title = "Low-lying non-normal parity states in 8B measured by proton elastic scattering on 7Be",

abstract = "A new measurement of proton resonance scattering on 7Be was performed up to the center-of-mass energy of 6.7 MeV using the low-energy RI beam facility CRIB (CNS Radioactive Ion Beam separator) at the Center for Nuclear Study of the University of Tokyo. The excitation function of 7Be + p elastic scattering above 3.5 MeV was measured successfully for the first time, providing important information about the resonance structure of the 8B nucleus. The resonances are related to the reaction rate of 7Be(p, γ)8B, which is the key reaction in solar 8B neutrino production. Evidence for the presence of two negative parity states is presented. One of them is a 2- state observed as a broad s-wave resonance, the existence of which had been questionable. Its possible effects on the determination of the astrophysical S-factor of 7Be(p, γ)8B at solar energy are discussed. The other state had not been observed in previous measurements, and its spin and parity were determined as 1-.",

keywords = "Be(p, γ)B, Proton resonance scattering, RI beam, Solar neutrino",

author = "H. Yamaguchi and Y. Wakabayashi and S. Kubono and G. Amadio and H. Fujikawa and T. Teranishi and A. Saito and He, {J. J.} and S. Nishimura and Y. Togano and Kwon, {Y. K.} and M. Niikura and N. Iwasa and K. Inafuku and Khiem, {L. H.}",

note = "Funding Information: The experiment was performed at RI Beam Factory operated by RIKEN Nishina Center and CNS, the University of Tokyo. We are grateful to the RIKEN accelerator staff for their help. This work was supported by a Grant-in-Aid for Young Scientists (B) (Grant No. 17740135) of JSPS. ",

year = "2009",

month = feb,

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doi = "10.1016/j.physletb.2009.01.033",

language = "English",

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T1 - Low-lying non-normal parity states in 8B measured by proton elastic scattering on 7Be

AU - Yamaguchi, H.

AU - Wakabayashi, Y.

AU - Kubono, S.

AU - Amadio, G.

AU - Fujikawa, H.

AU - Teranishi, T.

AU - Saito, A.

AU - He, J. J.

AU - Nishimura, S.

AU - Togano, Y.

AU - Kwon, Y. K.

AU - Niikura, M.

AU - Iwasa, N.

AU - Inafuku, K.

AU - Khiem, L. H.

N1 - Funding Information: The experiment was performed at RI Beam Factory operated by RIKEN Nishina Center and CNS, the University of Tokyo. We are grateful to the RIKEN accelerator staff for their help. This work was supported by a Grant-in-Aid for Young Scientists (B) (Grant No. 17740135) of JSPS.

PY - 2009/2/23

Y1 - 2009/2/23

N2 - A new measurement of proton resonance scattering on 7Be was performed up to the center-of-mass energy of 6.7 MeV using the low-energy RI beam facility CRIB (CNS Radioactive Ion Beam separator) at the Center for Nuclear Study of the University of Tokyo. The excitation function of 7Be + p elastic scattering above 3.5 MeV was measured successfully for the first time, providing important information about the resonance structure of the 8B nucleus. The resonances are related to the reaction rate of 7Be(p, γ)8B, which is the key reaction in solar 8B neutrino production. Evidence for the presence of two negative parity states is presented. One of them is a 2- state observed as a broad s-wave resonance, the existence of which had been questionable. Its possible effects on the determination of the astrophysical S-factor of 7Be(p, γ)8B at solar energy are discussed. The other state had not been observed in previous measurements, and its spin and parity were determined as 1-.

AB - A new measurement of proton resonance scattering on 7Be was performed up to the center-of-mass energy of 6.7 MeV using the low-energy RI beam facility CRIB (CNS Radioactive Ion Beam separator) at the Center for Nuclear Study of the University of Tokyo. The excitation function of 7Be + p elastic scattering above 3.5 MeV was measured successfully for the first time, providing important information about the resonance structure of the 8B nucleus. The resonances are related to the reaction rate of 7Be(p, γ)8B, which is the key reaction in solar 8B neutrino production. Evidence for the presence of two negative parity states is presented. One of them is a 2- state observed as a broad s-wave resonance, the existence of which had been questionable. Its possible effects on the determination of the astrophysical S-factor of 7Be(p, γ)8B at solar energy are discussed. The other state had not been observed in previous measurements, and its spin and parity were determined as 1-.

KW - Be(p, γ)B

KW - Proton resonance scattering

KW - RI beam

KW - Solar neutrino

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