Identification of low-energy isovector octupole states in 144Nd

21st International School on Nuclear Physics and Applications & International Symposium on Exotic Nuclei

Thürauf, M.^1 ; Scheck, M.^1,2,3 ; Bernards, C.^4 ; Blanc, A.^5 ; Cooper, N.^4 ; Defrance, G.^6 ; Jentschel, M.^5 ; Jolie, J.^7 ; Kaleja, O.^1 ; Köster, U.^5 ; Kröll, T.^1 ; Mutti, P.^5 ; Simpson, G.S.^8 ; Soldner, T.^5 ; Tezgel, M.^1 ; Urban, W.^9 ; Vanhoy, J.^10 ; Werner, M.^1 ; Werner, V.^1,4 ; Zell, K.O.^7

Institut. für Kernpliysik, TU Darmstadt, Sclilossgartenstr. 9, Darmstadt

64289, Germany^1

School of Eng. and Comp., Uuiv. of the West of Scotland, High Street, Paisley

PA1 2BE, United Kingdom^2

Scottish Universities Physics Alliance, University Avenue, Glasgow

G12 8QQ, United Kingdom^3

Wright Laboratory, Yale Univ, P.O. Box 208120, New Haven

CT

06520-8120, United States^4

Institut Laue-Langevin, 71 avenue des Martyrs, Grenoble

38000, France^5

Grand Accèlèrateur National DTons Lourds, Boulevard Henri Becquerel, Caen

14000, France^6

Institut für Kernpliysik, Universität zu Köhl, Zülpicher Str. 77, Köln

50937, Germany^7

LPSC, UJF Grenoble i, 53 avenue des Martyrs, Grenoble Cedex

38026, France^8

Faculty of Physics, University of Warsaw, ul. Pasteura 5, Warsaw

02-093, Poland

(10) Dep. of Physics, U.S. Naval Academy, 121 Blake Road, Annapolis

MD

21402, United States^9

关键词: Degree of freedom;    Low-energy;    Mixing ratios;    Multipoles;    Neutron capture;    Residual interactions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/724/1/012050/pdf
DOI  :  10.1088/1742-6596/724/1/012050

来源: IOP

【 摘 要 】

Recently, first candidates for low-lying isovector states in the octupole sector were suggested. The unambiguous identification of those states will contribute to the decomposition of the octupole-octupole residual interaction in an isoscalar and isovector part. This will help us understand the octupole degree of freedom. In144Nd the 3-state at 2778 keV is a good candidate for such a "mixed-symmetry'' octupole state. In order to clarify the nature of this state, a143Nd(n, γ)-experiment was conducted with the EXILL-setup. Following neutron capture the 3-states are populated and EXILL provides the opportunity to determine the multipole-mixing ratios of the 3i-→31-transitions. For the transition from the "mixed-symmetry" octupole state to the symmetric 31-state we expect a strong M1 component.