Determination of the B(E3, 0+ → 3?)-excitation strength in octupole-correlated nuclei near A ≈ 224 by the means of Coulomb excitation at REX-ISOLDE

20th International School on Nuclear Physics, Neutron Physics and Applications

Scheck, M.^1,2,3 ; Gaffney, L.P.^3,4 ; Butler, P.A.^3 ; Hayes, A.B.^5 ; Wenander, F.^6 ; Albers, M.^7 ; Bastin, B.^8 ; Bauer, C.^9 ; Blazhev, A.^7 ; Bönig, S.^9 ; Bree, N.^4 ; Cederkäil, J.^10 ; Chupp, T.^11 ; Cline, D.^5 ; Cocolios, T.E.^6 ; Davinson, T.^12 ; Witte, H De^4 ; Diriken, J.^4 ; Grahn, T.^13,14 ; Gregor, E.T.^1,2 ; Herzan, A.^13 ; Huyse, M.^4 ; Jenkins, D.G.^15 ; Joss, D.T.^3 ; Kesteloot, N.^4 ; Konki, J.^13 ; Kowalczyk, M.^16 ; Kröll, Th.^9 ; Kwan, E.^17 ; Lutter, R.^18,19 ; Moschner, K.^7 ; Napiorkowski, P.^16 ; Pakarinen, J.^6,13,14 ; Pfeiffer, M.^7 ; Radeck, D.^7 ; Reiter, P.^7 ; Reynders, K.^4 ; Rigby, S.V.^3 ; Robledo, L.M.^20 ; Rudigier, M.^7 ; Sambi, S.^4 ; Seidlitz, M.^7 ; Siebeck, B.^7 ; Stora, T.^6 ; Thoele, P.^7 ; Duppen, P. Van^4 ; Vermeulen, M.J.^15 ; Schmid, M. Von^9 ; Voulot, D.^6 ; Warr, N.^7 ; Wimmer, K.^19 ; Wrzosek-Lipska, K.^4,16 ; Wu, C.Y.^17 ; Zieliska, M.^16,21

School of Engineering, University of the West of Scotland, Paisley

PA1 2BE, United Kingdom^1

SUPA, Scottish Universities Physics Alliance, Glasgow

G12 8QQ, United Kingdom^2

Oliver Lodge Laboratory, University of Liverpool, Liverpool

L69 7ZE, United Kingdom^3

Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven

B-3001, Belgium^4

Department of Physics and Astronomy, University of Rochester, Rochester

NY

14627-0171, United States^5

ISOLDE, CERN, Geneva

CH-1211, Switzerland^6

Institut Fr Kernphysik, Universität zu Köln, Köln

D-50937, Germany^7

GANIL, BP 55027, Caen

F-14076, France^8

Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt

D-64289, Germany

(10) Department of Nuclear Physics, Lund University, PO Box 118, Lund

221 00, Sweden

(11) Department of Physics, University of Michigan, Ann Arbor

MI

48104, United States

(12) School of Physics and Astronomy, University of Edinburgh, Edinburgh

EH9 3JZ, United Kingdom

(13) Department of Physics, University of Jyväskylä, Jyväskylä

FI-40014, Finland

(14) Helsinki Institute of Physics, PO Box 64, Helsinki

FI-00014, Finland

(15) Department of Physics, University of York, York

YO10 5DD, United Kingdom

(16) Heavy Ion Laboratory, University of Warsaw, Warsaw

02-093, Poland

(17) Physics Division, Lawrence Livermore National Laboratory, Livermore

CA

94551, United States

(18) Maier-Leibnitz-Laboratorium, Ludwig-Maximilians-Universität, Garching

D-85748, Germany

(19) Physik Department E12, Technische Universität München, Garching

D-85748, Germany

(20) Departamento de Fisica Teorica, Universidad Autónoma de Madrid, Madrid

28049, Spain

(21) DSM/IRFU/SPhN, CEA Saclay, Gif-sur-Yvette

F-91191, France^9

关键词: Atomic system;    Beam particles;    Coulomb excitation;    De-excitations;    Excitation strengths;    Gamma ray yields;    Matrix elements;    Schiff moment;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/533/1/012007/pdf
DOI  :  10.1088/1742-6596/533/1/012007

来源: IOP

【 摘 要 】

The IS475 collaboration conducted Coulomb-excitation experiments with postaccelerated radioactive220Rn and224Ra beams at the REX-ISOLDE facility. The beam particles (Ebeam≈ 2.83 MeV/u) were Coulomb excited using60Ni,114Cd, and120Sn scattering targets. De-excitation γ-rays were detected employing the Miniball array and scattered particles were detected in a silicon detector. Exploiting the Coulomb-excitation code GOSIA for each nucleus several matrix elements could be obtained from the measured γ-ray yields. The extracted 〈3-||Ê3||0+〉 matrix element allows for the conclusion that, while220Rn represents an octupole vibrational system,224Ra has already substantial octupole correlations in its ground state. An observation that has implications for the search of CP-violating Schiff moments in the atomic systems of the adjacent odd-mass nuclei.