Low lying electric dipole excitations in nuclei of the rare earth region
- Koeln Univ. (Germany). Inst. fuer Kernphysik
- Brookhaven National Lab., Upton, NY (United States)
- Stuttgart Univ. (Germany). Inst. fuer Strahlenphysik
- Giessen Univ. (Germany). Inst. fuer Kernphysik
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.
- Research Organization:
- Brookhaven National Lab., Upton, NY (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 10186297
- Report Number(s):
- BNL-47889; CONF-920555-3; ON: DE93001441
- 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
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Related Subjects
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
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