Evidence for radiative coupling of the pygmy dipole resonance to excited states

被引：75

作者：

Angell, C. T. ^{[1
,2
,3
,4
]}

Hammond, S. L. ^{[1
,2
]}

Karwowski, H. J. ^{[1
,2
]}

Kelley, J. H. ^{[2
,5
]}

Krticka, M. ^{[6
]}

Kwan, E. ^{[2
,7
]}

Makinaga, A. ^{[8
]}

Rusev, G. ^{[2
,7
]}

机构：

[1] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 USA

[2] Triangle Univ Nucl Lab, Durham, NC 27708 USA

[3] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA

[4] Japan Atom Energy Agcy, Quantum Beam Sci Directorate, Tokai, Ibaraki 3191195, Japan

[5] N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA

[6] Charles Univ Prague, Fac Math & Phys, CR-18000 Prague 8, Czech Republic

[7] Duke Univ, Dept Phys, Durham, NC 27708 USA

[8] Konan Univ, Dept Phys, Kobe, Hyogo 6588501, Japan

来源：

PHYSICAL REVIEW C | 2012年 / 86卷 / 05期

关键词：

STRENGTH FUNCTION; CROSS-SECTIONS; NUCLEI; SCATTERING; WIDTH;

D O I：

10.1103/PhysRevC.86.051302

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 photoabsorption cross section and ground-state branching ratio of Nd-142 were measured using quasimonoenergetic gamma-ray beams at several beam energies. Two peaks corresponding to the pygmy dipole resonance (PDR) were identified. The branching ratios were compared to statistical-model calculations. We found that the Brink hypothesis is violated, and that the branching ratios are only reproduced by introducing a possible new decay mode of the observed PDR.

引用

页数：5

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