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Transition probabilities in 134Pr: a test for chirality in nuclear systems.

D Tonev¹, G de Angelis, P Petkov

¹Laboratori Nazionali di Legnaro, INFN, I-35020 Legnaro, Italy.

Physical Review Letters

|February 21, 2006

Summary

Researchers investigated excited states in 134Pr using fusion-evaporation reactions. Experimental results suggest shape fluctuations, not static chirality, are key in 134Pr, supporting intrinsic chirality dynamically.

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Area of Science:

Nuclear Physics
Atomic Physics
Quantum Mechanics

Background:

Understanding nuclear structure and collective excitations is crucial in nuclear physics.
Chirality in atomic nuclei, particularly the phenomenon of static and dynamic chirality, remains an active area of research.
Shape fluctuations significantly influence nuclear properties and excitation modes.

Purpose of the Study:

To investigate the excited states in the nucleus 134Pr.
To explore the presence and nature of chirality in 134Pr.
To compare experimental data with theoretical models, specifically the two-quasiparticle plus triaxial rotor and interacting boson-fermion-fermion models.

Main Methods:

Utilized the fusion-evaporation reaction 119Sn(19F,4n)134Pr to populate excited states in 134Pr.
Employed Recoil Distance Doppler-shift (RDDS) and Doppler-Shift Attenuation (DSA) measurements.
Data were collected using the Euroball spectrometer, Bismuth Germanate ball, and Cologne plunger at specific beam energies (87 MeV and 83 MeV).

Main Results:

Reduced transition probabilities in 134Pr were experimentally determined.
The experimental findings do not support the existence of static chirality in 134Pr.
Shape fluctuations were identified as a significant factor in the nuclear structure of 134Pr.

Conclusions:

The study indicates that static chirality is not present in 134Pr.
The importance of nuclear shape fluctuations is highlighted.
The presence of intrinsic chirality in 134Pr is supported only within a dynamical framework.