Spectral Structure of the Pygmy Dipole Resonance

被引：160

作者：

Tonchev, A. P. ^{[1
,2
]}

Hammond, S. L. ^{[2
,3
]}

Kelley, J. H. ^{[2
,4
]}

Kwan, E. ^{[1
,2
]}

Lenske, H. ^{[5
]}

Rusev, G. ^{[1
,2
]}

Tornow, W. ^{[1
,2
]}

Tsoneva, N. ^{[5
,6
]}

机构：

[1] Duke Univ, Durham, NC 27708 USA

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

[3] Univ N Carolina, Chapel Hill, NC 27599 USA

[4] N Carolina State Univ, Raleigh, NC 27695 USA

[5] Univ Giessen, Inst Theoret Phys, D-35392 Giessen, Germany

[6] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, BU-1784 Sofia, Bulgaria

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 07期

关键词：

NUCLEAR-STRUCTURE; NEUTRON SKIN; STRENGTH; ENERGY;

D O I：

10.1103/PhysRevLett.104.072501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

High-sensitivity studies of E1 and M1 transitions observed in the reaction Ba-138((gamma) over right arrow, gamma') at energies below the one-neutron separation energy have been performed using the nearly monoenergetic and 100% linearly polarized photon beams of the HI (gamma) over right arrowS facility. The electric dipole character of the so-called "pygmy" dipole resonance was experimentally verified for excitations from 4.0 to 8.6 MeV. The fine structure of the M1 "spin-flip" mode was observed for the first time in N = 82 nuclei.

引用

页数：4

共 30 条

[1] Evidence for pygmy and giant dipole resonances in 130Sn and 132Sn -: art. no. 132501 [J].

Adrich, P ;

Klimkiewicz, A ;

Fallot, M ;

Boretzky, K ;

Aumann, T ;

Cortina-Gil, D ;

Pramanik, UD ;

Elze, TW ;

Emling, H ;

Geissel, H ;

Hellström, M ;

Jones, KL ;

Kratz, JV ;

Kulessa, R ;

Leifels, Y ;

Nociforo, C ;

Palit, R ;

Simon, H ;

Surówka, G ;

Sümmerer, K ;

Walus, W .

PHYSICAL REVIEW LETTERS, 2005, 95 (13)

[2] The p-process of stellar nucleosynthesis: astrophysics and nuclear physics status [J].

Arnould, A ;

Goriely, S .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2003, 384 (1-2) :1-84

[3] Reactions with fast radioactive beams of neutron-rich nuclei [J].

Aumann, T .

EUROPEAN PHYSICAL JOURNAL A, 2005, 26 (03) :441-478

[4] PHOTONEUTRON CROSS SECTIONS FOR BA-138 AND N-14 [J].

BERMAN, BL ;

FULTZ, SC ;

CALDWELL, JT ;

KELLY, MA ;

DIETRICH, SS .

PHYSICAL REVIEW C, 1970, 2 (06) :2318-+

[5] Parity assignments to strong dipole excitations of 92Zr and 96Mo -: art. no. 044317 [J].

Fransen, C ;

Pietralla, N ;

Tonchev, AP ;

Ahmed, MW ;

Chen, J ;

Feldman, G ;

Kneissl, U ;

Li, J ;

Litvinenko, VN ;

Perdue, B ;

Pinayev, IV ;

Pitz, HH ;

Prior, R ;

Sabourov, K ;

Spraker, M ;

Tornow, W ;

Weller, HR ;

Werner, V ;

Wu, YK ;

Yates, SW .

PHYSICAL REVIEW C, 2004, 70 (04) :044317-1

[6]

Harakeh M N., 2001, Giant Resonances: Fundamental High-Frequency Modes of Nuclear Excitation

[7] Resolved dipole strength below the El giant resonance in 138Ba -: art. no. 051307 [J].

Herzberg, RD ;

Fransen, C ;

von Brentano, P ;

Eberth, J ;

Enders, J ;

Fitzler, A ;

Käubler, L ;

Kaiser, H ;

von Neumann-Cosel, P ;

Pietralla, N ;

Ponomarev, VY ;

Prade, H ;

Richter, A ;

Schnare, H ;

Schwengner, R ;

Skoda, S ;

Thomas, HG ;

Tiesler, H ;

Weisshaar, D ;

Wiedenhöver, I .

PHYSICAL REVIEW C, 1999, 60 (05) :5

[8] Investigation of nuclear structure by resonance fluorescence scattering [J].

Kneissl, U ;

Pitz, HH ;

Zilges, A .

PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, VOL 37, 1996, 37 :349-433

[9] First evidence for spin-flip M1 strength in 40Ar [J].

Li, T. C. ;

Pietralla, N. ;

Tonchev, A. P. ;

Ahmed, M. W. ;

Ahn, T. ;

Angell, C. ;

Blackston, M. A. ;

Costin, A. ;

Keeter, K. J. ;

Li, J. ;

Lisetskiy, A. ;

Mikhailov, S. ;

Parpottas, Y. ;

Perdue, B. A. ;

Rainovski, G. ;

Tornow, W. ;

Weller, H. R. ;

Wu, Y. K. .

PHYSICAL REVIEW C, 2006, 73 (05)

[10] Photoexcitation of astrophysically important states in 26Mg [J].

Longland, R. ;

Iliadis, C. ;

Rusev, G. ;

Tonchev, A. P. ;

deBoer, R. J. ;

Goerres, J. ;

Wiescher, M. .

PHYSICAL REVIEW C, 2009, 80 (05)

← 1 2 3 →