Evidence for direct neutron decay of the isoscalar giant dipole resonances in $^{90}\mathrm{Zr}$, $^{116}\mathrm{Sn}$, and $^{208}\mathrm{Pb}$

Evidence for direct neutron decay of the isoscalar giant dipole resonances in ${}^{90}{Zr}$ , ${}^{116}{Sn}$ , and ${}^{208}{Pb}$

M. Hunyadi, A. M. van den Berg, B. Davids, M. N. Harakeh, M. A. de Huu, H. J. Wörtche, M. Csatlós, J. Gulyás, A. Krasznahorkay, D. Sohler, U. Garg, M. Fujiwara, and N. Blasi

Phys. Rev. C 75, 014606 – Published 30 January 2007

Abstract

The direct and statistical neutron decay of the isoscalar giant dipole resonance was studied in ${}^{90}{Zr}$ , ${}^{116}{Sn}$ , and ${}^{208}{Pb}$ using the $(α, α^{'} n)$ reaction at a bombarding energy of 200 MeV. The spectra of fast decay neutrons populating valence hole-states of the $Z, N - 1$ nuclei were analyzed, and estimates for the branching ratios were determined. The results were compared to recent continuum random-phase approximation calculations.

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Received 19 October 2006

DOI:https://doi.org/10.1103/PhysRevC.75.014606

Authors & Affiliations

M. Hunyadi^*, A. M. van den Berg, B. Davids^†, M. N. Harakeh, M. A. de Huu, and H. J. Wörtche

Kernfysisch Versneller Instituut, University of Groningen, 9747 AA Groningen, The Netherlands

M. Csatlós, J. Gulyás, A. Krasznahorkay, and D. Sohler

Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen, Hungary

U. Garg

University of Notre Dame, Notre Dame, Indiana 46556, USA

M. Fujiwara

Research Center for Nuclear Physics, Osaka University, Mihogaoka 10-1, Ibaraki, 567-0047 Osaka, Japan

N. Blasi

INFN, Milano I-20133, Italy

^*Electronic address: hunyadi@atomki.hu; Present address: Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen, Hungary.
^†Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver BC, V6T 2A3, Canada.

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Vol. 75, Iss. 1 — January 2007

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Physical Review C

covering nuclear physics

Evidence for direct neutron decay of the isoscalar giant dipole resonances in ${}^{90}{Zr}$ , ${}^{116}{Sn}$ , and ${}^{208}{Pb}$

M. Hunyadi, A. M. van den Berg, B. Davids, M. N. Harakeh, M. A. de Huu, H. J. Wörtche, M. Csatlós, J. Gulyás, A. Krasznahorkay, D. Sohler, U. Garg, M. Fujiwara, and N. Blasi

Phys. Rev. C 75, 014606 – Published 30 January 2007

Abstract

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Physical Review C

covering nuclear physics

Evidence for direct neutron decay of the isoscalar giant dipole resonances in Zr90, Sn116, and Pb208

M. Hunyadi, A. M. van den Berg, B. Davids, M. N. Harakeh, M. A. de Huu, H. J. Wörtche, M. Csatlós, J. Gulyás, A. Krasznahorkay, D. Sohler, U. Garg, M. Fujiwara, and N. Blasi

Phys. Rev. C 75, 014606 – Published 30 January 2007

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Evidence for direct neutron decay of the isoscalar giant dipole resonances in ${}^{90}{Zr}$ , ${}^{116}{Sn}$ , and ${}^{208}{Pb}$