ISOMER BEAMS

As a subset of radioactive beams, isomer beams open up the dimensions of excitation energy and angular momentum. The problem of isomer decay rates is briefly presented, as they are not yet well understood. The use of isomer beams for nuclear structure investigations is reviewed, using examples related to exotic decay modes, charge radii, and Coulomb excitation. There are also unique possibilities for the study of induced electromagnetic depopulation. A key aspect is beam purification, for which different techniques are discussed.

Download Full-text

Nuclear structure effects of the nucleiDy152,154,156at high excitation energy and large angular momentum

Physical Review C ◽

10.1103/physrevc.51.3084 ◽

1995 ◽

Vol 51 (6) ◽

pp. 3084-3095 ◽

Cited By ~ 11

Author(s):

V. Martin ◽

J. L. Egido

Keyword(s):

Angular Momentum ◽

Excitation Energy ◽

Nuclear Structure ◽

High Excitation Energy ◽

High Excitation ◽

Large Angular Momentum

Download Full-text

SHELL STRUCTURE, COLLECTIVITY AND NUCLEAR SHAPES — RISING IN-BEAM EXPERIMENTS AT RELATIVISTIC ENERGIES

International Journal of Modern Physics E ◽

10.1142/s0218301306005083 ◽

2006 ◽

Vol 15 (07) ◽

pp. 1495-1503

Author(s):

◽

PIETER DOORNENBAL

Keyword(s):

High Resolution ◽

Shell Model ◽

Nuclear Structure ◽

Shell Structure ◽

Mirror Symmetry ◽

Coulomb Excitation ◽

Radioactive Beams ◽

Model Calculations ◽

Electromagnetic Transition ◽

Γ Ray

The RISING fast beam campaign aims at high resolution γ-ray spectroscopy experiments with relativistic radioactive beams at GSI. The secondary beams produced by fragmentation or fission are used for Coulomb excitation or secondary fragmentation experiments to perform studies of nuclei far off stability. The physics phenomena studied with this method include nuclear structure experiments targeting at the evolution of shell structure toward the drip lines, mirror symmetry, collectivity and electromagnetic transition strengths. Example results of this fast beam campaign are presented and compared to various shell model calculations and nuclear structure models.

Download Full-text

Dealing with contaminants in Coulomb excitation of radioactive beams

Journal of Physics Conference Series ◽

10.1088/1742-6596/1643/1/012146 ◽

2020 ◽

Vol 1643 ◽

pp. 012146

Author(s):

L Morrison ◽

K Hadyńska-Klęk ◽

Zs Podolyák ◽

L P Gaffney ◽

L Kaya ◽

...

Keyword(s):

Coulomb Excitation ◽

Radioactive Beams

Download Full-text

NEW STRUCTURES IN 178HF AND COULOMB EXCITATION OF ISOMERS

International Journal of Modern Physics E ◽

10.1142/s0218301311017879 ◽

2011 ◽

Vol 20 (02) ◽

pp. 474-481 ◽

Cited By ~ 3

Author(s):

A.B. HAYES ◽

D. CLINE ◽

C. Y. WU ◽

A.M. HURST ◽

M.P. CARPENTER ◽

...

Keyword(s):

Angular Momentum ◽

Ground State ◽

Coulomb Excitation ◽

National Laboratory ◽

Argonne National Laboratory ◽

Particle Detector ◽

Ground State Band ◽

Rotational Bands ◽

Coincidence Data ◽

State Band

A 985 MeV 178 Hf beam was Coulomb excited by a 208 Pb target at the ATLAS accelerator of Argonne National Laboratory. Gammasphere and the CHICO particle detector recorded particle-γ coincidence data. The aim was to populate and determine the mechanism of previously observed Coulomb excitation of the Kπ = 6+ (t1/2 = 77 ns ), 8- (4 s ) and 16+ (31 y ) isomer bands. New rotational bands were identified including an aligned band which appears to mix with the ground-state band (GSB) and the γ-vibrational band above ~ 12 ħ of angular momentum. Newly observed γ-decay transitions into the three isomer bands may elucidate the K-mixing which allows Coulomb excitation of these isomer bands, but direct decays from the GSB into the 16+ isomer band have not yet been confirmed.

Download Full-text