# Nuclear Shell Model - Spin-parity of excited states

• Manman
In summary, the ground state of _{6}Cl^{13} has a spin-parity of 1/2- and the next three excited states have values of 1/2+, 3/2-, and 5/2+. These values can be explained in terms of the shell model, where the initial configuration includes an extra p in 1P_{1/2}. Possible configurations for the first excitation that would result in a spin-parity of 1/2+ include (1s_\frac{1}{2})^2(1p_\frac{3}{2})^3(1p_\frac{1}{2})^1(1d_\frac{5}{2})^
Manman

## Homework Statement

The ground state of $$_{6}Cl^{13}$$ has spin-parity 1/2- and the next three excited states have values of 1/2+, 3/2- and 5/2+. Explain these values in terms of the shell model.

## The Attempt at a Solution

The problem is that i don't know what is being asked of me...i initially tried to go through the excitations and work out which configurations fit each one, but lots do!

In more detail, I know that initially there is 1 extra p in $$1P_{1/2}$$

The initial configuration is:

$$(1s_\frac{1}{2})^2(1p_\frac{3}{2})^4(1p_\frac{1}{2 })^1$$

A configuration that could give a spin-parity of 1/2+ for the first excitation:

$$(1s_\frac{1}{2})^2(1p_\frac{3}{2})^3(1p_\frac{1}{2 })^1(1d_\frac{5}{2})^1$$

or

$$(1s_\frac{1}{2})^2(1p_\frac{3}{2})^4(1p_\frac{1}{2 })^0(1d_\frac{5}{2})^0(2s_\frac{1}{2})^1$$

Now, if this is correct then we can follow on from this in 2 directions, and each one of these splits into many options for the 2nd excited state. And we do not getting any definite configuration for any of the excited states.

Am i going about this correctly? Maybe the question is asking something entirely different.

Last edited:
no luck so far, anyone?

## 1. What is the Nuclear Shell Model?

The Nuclear Shell Model is a theoretical model used to describe the structure of atomic nuclei. It proposes that nucleons (protons and neutrons) are arranged in energy levels, similar to electrons in an atom, and that certain energy levels are more stable than others.

## 2. What is the significance of the spin-parity of excited states in the Nuclear Shell Model?

The spin-parity of excited states refers to the spin and parity (intrinsic angular momentum and spatial orientation) of the nucleons in a particular energy level. This information is crucial in determining the overall energy and stability of the nucleus, as well as the likelihood of certain nuclear reactions taking place.

## 3. How is the spin-parity of excited states determined in the Nuclear Shell Model?

The spin-parity of excited states is determined through experimental techniques, such as measuring the energy levels and decay patterns of nuclei. Theoretical calculations based on the Nuclear Shell Model can also provide predictions for the spin-parity of excited states.

## 4. What is the role of the Nuclear Shell Model in understanding nuclear reactions?

The Nuclear Shell Model is essential in understanding nuclear reactions, as it provides a framework for predicting and explaining the behavior of nucleons in the nucleus. By considering the spin-parity of excited states, the Nuclear Shell Model can predict the likelihood of certain nuclear reactions occurring and the resulting products.

## 5. What are some limitations of the Nuclear Shell Model?

While the Nuclear Shell Model has been successful in predicting and explaining many nuclear phenomena, it also has some limitations. For example, it does not account for the strong nuclear force, which is responsible for binding nucleons together. Additionally, it does not fully explain the behavior of nuclei with large numbers of nucleons or those with extreme conditions, such as high temperatures or pressures.

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