Related Experiment Video
Updated: May 26, 2026
08:22
Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
Electromagnetic transition rates in 100,101Pd using the Recoil Doppler Shift Technique
V Anagnostatou1, P H Regan, V Werner
1Department of Physics, University of Surrey, Guildford GU2 7XH, UK. va00012@surrey.ac.uk
Summary
Researchers measured quadrupole deformations in 100,101Pd transitional nuclei using the Recoil Distance Doppler Shift Method. Experimental results align with nuclear Total Routhian Surface calculations, confirming nuclear structure models.
Area of Science:
- Nuclear Physics
- Atomic and Molecular Physics
Background:
- Transitional nuclei exhibit complex nuclear structures.
- Understanding quadrupole deformations is key to nuclear structure theory.
Purpose of the Study:
- To determine quadrupole deformations in 100,101Pd.
- To measure electric quadrupole transition probabilities for low-lying states.
Main Methods:
- Utilized the Recoil Distance Doppler Shift Method.
- Employed a 268 MeV 80Se beam on a 24Mg target.
- Detected gamma-rays with the SPEEDY array and analyzed coincidence data at varying target-stopper distances.
Main Results:
- Measured mean-lifetimes for the 2+ state in 100Pd (13.3(9) ps) and the 15/2- state in 101Pd (10.8(8) ps).
- Deduced quadrupole deformations for these states.
Conclusions:
- Experimental data closely matches predictions from nuclear Total Routhian Surface calculations (within 10%).
- Validates theoretical models for describing nuclear properties in transitional nuclei.
Related Concept Videos
01:12Double Resonance Techniques: Overview
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
01:15NMR Spectroscopy: Chemical Shift Overview
The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
For instance, the proton...
For instance, the proton...
01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
01:27π Electron Effects on Chemical Shift: Overview
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
01:04¹³C NMR: ¹H–¹³C Decoupling
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...