Octupole transitions in the 208Pb region

11th International Spring Seminar on Nuclear Physics: Shell Model and Nuclear Structure – achievements of the past two decades

Podolyák, Zs^1 ; Shand, C.M.^1 ; Wilson, E.^1 ; Brown, B.A.^2 ; Grawe, H.^3 ; Chiara, C.J.^4,5 ; Zhu, S.^4 ; Fornal, B.^6 ; Janssens, R.V.F.^4 ; Bowry, M.^1 ; Bunce, M.^1 ; Carpenter, M.P.^4 ; Cieplicka, N.^6 ; Deo, A.Y.^7,8 ; Dracoulis, G.D.^9 ; Hoffman, C.R.^4 ; Kempley, R.S.^1 ; Kondev, F.G.^10 ; Lane, G.J.^9 ; Lauritsen, T.^4 ; Lotay, G.^1 ; Reed, M.W.^9 ; Regan, P.H.^1,11 ; Triguero, C. Rodríguez^12 ; Seweryniak, D.^4 ; Szpak, B.^6 ; Walker, P.M.^1

Department of Physics, University of Surrey, Guildford

GU2 7XH, United Kingdom^1

Michigan State University, East Lansing

MI

48824-1321, United States^2

GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt

D-64291, Germany^3

Physics Division, Argonne National Laboratory, Argonne

IL

60439, United States^4

Department of Chemistry and Biochemistry, University of Maryland, College Park

MD

20742, United States^5

H. Niewodniczaski Institute of Nuclear Physics, Kraków

PL-31342, Poland^6

Department of Physics, University of Massachusetts Lowell, Lowell

MA

01854, United States^7

Department of Physics, Indian Institute of Technology Roorkee, Roorkee

247667, India^8

Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra

ACT

0200, Australia

(10) Nuclear Engineering Division, Argonne National Laboratory, Argonne

IL

60439, United States

(11) National Physical Laboratory, Hampton Road, Middlesex, Teddington

TW11 0LW, United Kingdom

(12) School of Computing, Engineering and Mathematics, University of Brighton, Brighton

BN2 4GL, United Kingdom^9

关键词: Angular distribution measurements;    Matrix elements;    Octupole transition;    Shell models;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/580/1/012010/pdf
DOI  :  10.1088/1742-6596/580/1/012010

来源: IOP

【 摘 要 】

The208Pb region is characterised by the existence of collective octupole states. Here we populated such states in208Pb +208Pb deep-inelastic reactions. γ-ray angular distribution measurements were used to infer the octupole character of several E3 transitions. The octupole character of the 2318 keV 17-14+in208Pb, 2485 keV 19/2-13/2+in207Pb, 2419 keV 15/2-9/2+in209Pb and 2465 keV 17/2+11/2-in207Tl transitions was demonstrated for the first time. In addition, shell model calculations were performed using two different sets of two-body matrix elements. Their predictions were compared with emphasis on collective octupole states.