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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C 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...
Deformation of a Beam under Transverse Loading01:15

Deformation of a Beam under Transverse Loading

Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...

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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Well developed deformation in 42Si.

S Takeuchi1, M Matsushita, N Aoi

  • 1RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.

Physical Review Letters
|December 11, 2012
PubMed
Summary

Researchers studied excited states in Silicon (Si) isotopes using gamma-ray spectroscopy. The findings reveal rapid development of nuclear deformation in Si isotopes as neutron number increases towards N=28.

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Area of Science:

  • Nuclear Physics
  • Atomic and Molecular Physics
  • Spectroscopy

Background:

  • Investigating the structure of exotic nuclei provides insights into nuclear forces.
  • Silicon isotopes near the N=28 neutron magic number are crucial for understanding nuclear deformation.

Purpose of the Study:

  • To study excited states in Silicon (Si) isotopes (38, 40, 42) using advanced spectroscopic techniques.
  • To probe the evolution of nuclear deformation in Si isotopes approaching the N=28 shell closure.

Main Methods:

  • Utilized in-beam gamma-ray spectroscopy following multinucleon removal reactions.
  • Employed gamma-gamma coincidence measurements with intense radioactive beams of 40S and 44S at RIKEN.
  • Identified gamma transitions and determined energy levels of excited states.

Main Results:

  • Confirmed the 2(+) state in 42Si at 742(8) keV.
  • Identified a candidate for the yrast 4(+) state in 42Si at 2173(14) keV.
  • Calculated energy ratios indicating significant nuclear deformation in 42Si (N=28) and observed trends for 38,40Si.

Conclusions:

  • The energy ratio in 42Si suggests well-developed deformation at N=28 and Z=14.
  • Results demonstrate a rapid increase in deformation for Si isotopes from N=24 to N=28.
  • Highlights the importance of the N=28 shell closure in shaping nuclear structure.