Direct proton decay of the isoscalar giant dipole resonance in 208Pb

B. K. Nayak; U. Garg; M. Koss; T. Li; E. Martis; H. Fujimura; M. Fujiwara; K. Hara; K. Kawase; K. Nakanishi; E. Obayashi; H. P. Yoshida; M. Itoh; S. Kishi; H. Sakaguchi; H. Takeda; M. Uchida; Y. Yasuda; M. Yosoi; R. G.T. Zegers; H. Akimune; M. N. Harakeh; M. Hunyadi

doi:10.1016/j.physletb.2009.03.047

Direct proton decay of the isoscalar giant dipole resonance in ²⁰⁸Pb

B. K. Nayak, U. Garg, M. Koss, T. Li, E. Martis, H. Fujimura, M. Fujiwara, K. Hara, K. Kawase, K. Nakanishi, E. Obayashi, H. P. Yoshida, M. Itoh, S. Kishi, H. Sakaguchi, H. Takeda, M. Uchida, Y. Yasuda, M. Yosoi, R. G.T. ZegersH. Akimune, M. N. Harakeh, M. Hunyadi

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Abstract

The excitation and subsequent proton decay of the isoscalar giant dipole resonance (ISGDR) in ²⁰⁸Pb have been investigated via the ²⁰⁸Pb (α, α^′ p) ²⁰⁷Tl reaction at 400 MeV. Excitation of the ISGDR has been identified by the difference-of-spectra method. The enhancement of the ISGDR strength at high excitation energies observed in the multipole-decomposition-analysis of the singles ²⁰⁸Pb (α, α^′) spectra is not present in the excitation energy spectrum obtained in coincidence measurement. The partial branching ratios for direct proton decay of ISGDR to low-lying states of ²⁰⁷Tl have been determined and the results are compared with predictions of continuum random-phase-approximation (CRPA) calculations.

Original language	English
Pages (from-to)	281-285
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	674
Issue number	4-5
DOIs	https://doi.org/10.1016/j.physletb.2009.03.047
Publication status	Published - 2009 Apr 27
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.physletb.2009.03.047

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Nayak, B. K., Garg, U., Koss, M., Li, T., Martis, E., Fujimura, H., Fujiwara, M., Hara, K., Kawase, K., Nakanishi, K., Obayashi, E., Yoshida, H. P., Itoh, M., Kishi, S., Sakaguchi, H., Takeda, H., Uchida, M., Yasuda, Y., Yosoi, M., ... Hunyadi, M. (2009). Direct proton decay of the isoscalar giant dipole resonance in ²⁰⁸Pb. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 674(4-5), 281-285. https://doi.org/10.1016/j.physletb.2009.03.047

Nayak, BK, Garg, U, Koss, M, Li, T, Martis, E, Fujimura, H, Fujiwara, M, Hara, K, Kawase, K, Nakanishi, K, Obayashi, E, Yoshida, HP, Itoh, M, Kishi, S, Sakaguchi, H, Takeda, H, Uchida, M, Yasuda, Y, Yosoi, M, Zegers, RGT, Akimune, H, Harakeh, MN & Hunyadi, M 2009, 'Direct proton decay of the isoscalar giant dipole resonance in ²⁰⁸Pb', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 674, no. 4-5, pp. 281-285. https://doi.org/10.1016/j.physletb.2009.03.047

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title = "Direct proton decay of the isoscalar giant dipole resonance in 208Pb",

abstract = "The excitation and subsequent proton decay of the isoscalar giant dipole resonance (ISGDR) in 208Pb have been investigated via the 208Pb (α, α′ p) 207Tl reaction at 400 MeV. Excitation of the ISGDR has been identified by the difference-of-spectra method. The enhancement of the ISGDR strength at high excitation energies observed in the multipole-decomposition-analysis of the singles 208Pb (α, α′) spectra is not present in the excitation energy spectrum obtained in coincidence measurement. The partial branching ratios for direct proton decay of ISGDR to low-lying states of 207Tl have been determined and the results are compared with predictions of continuum random-phase-approximation (CRPA) calculations.",

author = "Nayak, {B. K.} and U. Garg and M. Koss and T. Li and E. Martis and H. Fujimura and M. Fujiwara and K. Hara and K. Kawase and K. Nakanishi and E. Obayashi and Yoshida, {H. P.} and M. Itoh and S. Kishi and H. Sakaguchi and H. Takeda and M. Uchida and Y. Yasuda and M. Yosoi and Zegers, {R. G.T.} and H. Akimune and Harakeh, {M. N.} and M. Hunyadi",

note = "Funding Information: The authors acknowledge the staff of the RCNP ring cyclotron for providing a high-quality, halo-free α beam during the experiment. This work was supported in part by the US–Japan Cooperative Science Program of the JSPS, the US National Science Foundation (grant Nos. INT-9910015, PHY04-57120 and PHY07-581100), and the University of Notre Dame.",

year = "2009",

month = apr,

day = "27",

doi = "10.1016/j.physletb.2009.03.047",

language = "English",

volume = "674",

pages = "281--285",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

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T1 - Direct proton decay of the isoscalar giant dipole resonance in 208Pb

AU - Nayak, B. K.

AU - Garg, U.

AU - Koss, M.

AU - Li, T.

AU - Martis, E.

AU - Fujimura, H.

AU - Fujiwara, M.

AU - Hara, K.

AU - Kawase, K.

AU - Nakanishi, K.

AU - Obayashi, E.

AU - Yoshida, H. P.

AU - Itoh, M.

AU - Kishi, S.

AU - Sakaguchi, H.

AU - Takeda, H.

AU - Uchida, M.

AU - Yasuda, Y.

AU - Yosoi, M.

AU - Zegers, R. G.T.

AU - Akimune, H.

AU - Harakeh, M. N.

AU - Hunyadi, M.

N1 - Funding Information: The authors acknowledge the staff of the RCNP ring cyclotron for providing a high-quality, halo-free α beam during the experiment. This work was supported in part by the US–Japan Cooperative Science Program of the JSPS, the US National Science Foundation (grant Nos. INT-9910015, PHY04-57120 and PHY07-581100), and the University of Notre Dame.

PY - 2009/4/27

Y1 - 2009/4/27

N2 - The excitation and subsequent proton decay of the isoscalar giant dipole resonance (ISGDR) in 208Pb have been investigated via the 208Pb (α, α′ p) 207Tl reaction at 400 MeV. Excitation of the ISGDR has been identified by the difference-of-spectra method. The enhancement of the ISGDR strength at high excitation energies observed in the multipole-decomposition-analysis of the singles 208Pb (α, α′) spectra is not present in the excitation energy spectrum obtained in coincidence measurement. The partial branching ratios for direct proton decay of ISGDR to low-lying states of 207Tl have been determined and the results are compared with predictions of continuum random-phase-approximation (CRPA) calculations.

AB - The excitation and subsequent proton decay of the isoscalar giant dipole resonance (ISGDR) in 208Pb have been investigated via the 208Pb (α, α′ p) 207Tl reaction at 400 MeV. Excitation of the ISGDR has been identified by the difference-of-spectra method. The enhancement of the ISGDR strength at high excitation energies observed in the multipole-decomposition-analysis of the singles 208Pb (α, α′) spectra is not present in the excitation energy spectrum obtained in coincidence measurement. The partial branching ratios for direct proton decay of ISGDR to low-lying states of 207Tl have been determined and the results are compared with predictions of continuum random-phase-approximation (CRPA) calculations.

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EP - 285

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

IS - 4-5

ER -

Direct proton decay of the isoscalar giant dipole resonance in ²⁰⁸Pb

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