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Title: Low lying electric dipole excitations in nuclei of the rare earth region

Abstract

From many experiments with low energy photon scattering on deformed rare earth nuclei we have obtained detailed information about the distribution of electric dipole strength below 4 MeV. Apart from some weaker transitions between 2 and 4 MeV we observed one, and sometimes two, very strong El-groundstate transitions around 1.5 MeV in all examined nuclei. They arise from the de-excitation of the bandheads of the (J{sup {pi}},K)=(l{sup {minus}},0) and (J{sup {pi}},K)=(l{sup {minus}},1) octupole vibrational bands. It is shown that the decay branching ratios and the absolute transition strengths of these states can be reproduced rather well with an improved T(El)-operator in the sdf-Interacting Boson Model. Another class of octupole states has been investigated in the region of the semimagic nucleus {sup 142}Nd. Here a quintuplet of collective excitations around 3.5 MeV is expected due to the coupling of the 3{minus}-octupole vibration with the 2+-quadrupole vibration. We performed photon scattering experiments on the odd A neighboring nucleus {sup 141}Pr and found first evidence for the existence of 3{sup {minus}}{circle_times}2+{circle_times}particle-states.

Authors:
; ;  [1];  [2]; ; ;  [3];  [4]
  1. Koeln Univ. (Germany). Inst. fuer Kernphysik
  2. Brookhaven National Lab., Upton, NY (United States)
  3. Stuttgart Univ. (Germany). Inst. fuer Strahlenphysik
  4. Giessen Univ. (Germany). Inst. fuer Kernphysik
Publication Date:
Research Org.:
Brookhaven National Lab., Upton, NY (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10186297
Report Number(s):
BNL-47889; CONF-920555-3
ON: DE93001441
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Conference
Resource Relation:
Conference: 4. international spring seminar on nuclear physics: the building blocks of nuclear structure,Amalfi (Italy),18-22 May 1992; Other Information: PBD: [1992]
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; RARE EARTH NUCLEI; E1-TRANSITIONS; ELECTRIC DIPOLES; EXCITATION; NUCLEAR DEFORMATION; NUCLEAR STRUCTURE; EVEN-EVEN NUCLEI; BRANCHING RATIO; HAMILTONIANS; MATRIX ELEMENTS; PRASEODYMIUM 141; QUADRUPOLES; OCTUPOLES; SCATTERING; PHOTON-NUCLEON INTERACTIONS; NEODYMIUM 142; INTERACTING BOSON MODEL; 663100

Citation Formats

von Brentano, P, Zilges, A, Herzberg, R D, Zamfir, N V, Kneissl, U, Heil, R D, Pitz, H H, and Wesselborg, C. Low lying electric dipole excitations in nuclei of the rare earth region. United States: N. p., 1992. Web.
von Brentano, P, Zilges, A, Herzberg, R D, Zamfir, N V, Kneissl, U, Heil, R D, Pitz, H H, & Wesselborg, C. Low lying electric dipole excitations in nuclei of the rare earth region. United States.
von Brentano, P, Zilges, A, Herzberg, R D, Zamfir, N V, Kneissl, U, Heil, R D, Pitz, H H, and Wesselborg, C. 1992. "Low lying electric dipole excitations in nuclei of the rare earth region". United States. https://www.osti.gov/servlets/purl/10186297.
@article{osti_10186297,
title = {Low lying electric dipole excitations in nuclei of the rare earth region},
author = {von Brentano, P and Zilges, A and Herzberg, R D and Zamfir, N V and Kneissl, U and Heil, R D and Pitz, H H and Wesselborg, C},
abstractNote = {From many experiments with low energy photon scattering on deformed rare earth nuclei we have obtained detailed information about the distribution of electric dipole strength below 4 MeV. Apart from some weaker transitions between 2 and 4 MeV we observed one, and sometimes two, very strong El-groundstate transitions around 1.5 MeV in all examined nuclei. They arise from the de-excitation of the bandheads of the (J{sup {pi}},K)=(l{sup {minus}},0) and (J{sup {pi}},K)=(l{sup {minus}},1) octupole vibrational bands. It is shown that the decay branching ratios and the absolute transition strengths of these states can be reproduced rather well with an improved T(El)-operator in the sdf-Interacting Boson Model. Another class of octupole states has been investigated in the region of the semimagic nucleus {sup 142}Nd. Here a quintuplet of collective excitations around 3.5 MeV is expected due to the coupling of the 3{minus}-octupole vibration with the 2+-quadrupole vibration. We performed photon scattering experiments on the odd A neighboring nucleus {sup 141}Pr and found first evidence for the existence of 3{sup {minus}}{circle_times}2+{circle_times}particle-states.},
doi = {},
url = {https://www.osti.gov/biblio/10186297}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Oct 01 00:00:00 EDT 1992},
month = {Thu Oct 01 00:00:00 EDT 1992}
}

Conference:
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