Isospin Character of the Pygmy Dipole Resonance in 124Sn

被引：176

作者：

Endres, J. ^{[1
]}

Litvinova, E. ^{[2
,3
]}

Savran, D. ^{[4
]}

Butler, P. A. ^{[5
]}

Harakeh, M. N. ^{[2
,6
]}

Harissopulos, S. ^{[7
]}

Herzberg, R. -D. ^{[5
]}

Kruecken, R. ^{[8
]}

Lagoyannis, A. ^{[7
]}

Pietralla, N. ^{[4
]}

Ponomarev, V. Yu ^{[4
]}

Popescu, L. ^{[6
,9
]}

Ring, P. ^{[8
]}

Scheck, M. ^{[5
]}

Sonnabend, K. ^{[4
]}

Stoica, V. I. ^{[6
]}

Wortche, H. J. ^{[6
]}

Zilges, A. ^{[1
]}

机构：

[1] Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany

[2] GSI Helmholtzzentrum Schwerionenforsch, D-64291 Darmstadt, Germany

[3] Goethe Univ Frankfurt, Inst Theoret Phys, D-60438 Frankfurt, Germany

[4] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany

[5] Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England

[6] Univ Groningen, Kernfys Versneller Inst, NL-9747 AA Groningen, Netherlands

[7] NCSR Demokritos, Inst Nucl Phys, GR-15310 Athens, Greece

[8] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany

[9] Belgian Nucl Res Ctr SCK CEN, B-2400 Mol, Belgium

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 21期

关键词：

NUCLEI; STRENGTH; ENERGY; MODES;

D O I：

10.1103/PhysRevLett.105.212503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The pygmy dipole resonance has been studied in the proton-magic nucleus Sn-124 with the (alpha, alpha'gamma) coincidence method at E-alpha = 136 MeV. The comparison with results of photon-scattering experiments reveals a splitting into two components with different structure: one group of states which is excited in (alpha, alpha'gamma) as well as in (gamma, gamma') reactions and a group of states at higher energies which is only excited in (gamma, gamma') reactions. Calculations with the self-consistent relativistic quasiparticle time-blocking approximation and the quasiparticle phonon model are in qualitative agreement with the experimental results and predict a low-lying isoscalar component dominated by neutron-skin oscillations and a higher-lying more isovector component on the tail of the giant dipole resonance.

引用

页数：4

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