# mnpa

**Repository Path**: luyi07/mnpa

## Basic Information

- **Project Name**: mnpa
- **Description**: M-scheme nucleon-pair approximation
- **Primary Language**: C++
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2021-05-21
- **Last Updated**: 2024-05-15

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README


mnpa is a nuclear structure code, to do (uncoupled basis) m-scheme nucleon-pair approximation of the shell model.

Acknowledgement: Yang Lei and I coded two versions of the same method, with cross checks. I appreciate all his collaboration and help all the way. He optimized his code more throughly, so I recommend it to you my reader: https://gitee.com/leiyang1985/OMR-NPA

* cmbas::obopdens(..,Qt,..) Qt can only be real, particle number must be even
* cmbas::ove does not check (M,pr), but rely on the algorithm to be 0 when (M,pr) does not match
* cmbas::tbopdens(...,Aint1,Aint2,...) only allows Aint1, Aint2 to be real, Nv =even
* cmbas::QQdens, I only reviewed the code for even cases
============ versions: what's new? ==============================

mNPA1.0

* eigen solver
	With given J-scheme nucleon-pairs, solves eigenvalues of shell-model 1+2body effective interactions, with given j-scheme pairs.

* sum rules
	With given shell model 1+2body interactions, and given wavefunctions previously generated, calculates the expectation values of the interactions. This is used in calculations of transition sum rules.

* unit tests
	With given single particle space, J-scheme pairs, bases, interaction operators, calculates overlaps, densities of one and two-body operators.
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