Direct neutron decay of the isoscalar giant dipole resonance

被引:1
|
作者
Hunyadi, M. [1 ]
van den Berg, A. M.
Davids, B.
Harakeh, M. N.
de Huu, M. A.
Wortche, H. J.
Csatlos, M.
Gulyas, J.
Krasznahorkay, A.
Sohler, D.
Garg, U.
Fujiwara, M.
Blasi, N.
机构
[1] Univ Groningen, Kernfys Versneller Inst, NL-9700 AB Groningen, Netherlands
[2] Hungarian Acad Sci, Inst Nucl Res, Debrecen, Hungary
[3] TRIUMF, Vancouver, BC V6T 2A3, Canada
[4] Univ Notre Dame, Notre Dame, IN 46556 USA
[5] Osaka Univ, Res Ctr Nucl Phys, Suita, Osaka 565, Japan
基金
美国国家科学基金会;
关键词
D O I
10.1134/S1063778807080145
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
The direct and statistical neutron decay of the isoscalar giant dipole resonance has been studied in Zr-90, Sn-116, and Pb-208 using the (alpha, alpha' 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 observation of the nucleon-direct-decay channels helped to select giant-resonance strengths and suppress the underlying background and continuum, which led to an indication of the existence of a new mode with L = 2 character, presumably the overtone of the isoscalar giant quadrupole resonance.
引用
收藏
页码:1407 / 1414
页数:8
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