Yes, there are journals and publications that provide detailed analysis of previous years UPSC Mathematics Optional subject papers. These resources can be highly beneficial for aspirants preparing for the UPSC Mathematics Optional exam as they provide insights into the pattern, difficulty level, and important topics of the previous years' papers. Here are some of the popular journals and publications:

1. Mathematics Spectrum: This journal focuses on providing comprehensive analysis and solutions to previous years' UPSC Mathematics Optional papers. It covers all topics and provides detailed explanations for each question, making it a valuable resource for aspirants.

2. UPSC Mathematics Optional Magazine: This magazine caters specifically to the needs of UPSC Mathematics Optional aspirants. It not only provides analysis of previous years' papers but also offers tips and strategies to approach different types of questions. It also includes practice questions and mock tests for self-assessment.

3. Mathematics Chronicle: This publication offers a detailed analysis of previous years' UPSC Mathematics Optional papers. It provides topic-wise analysis, highlighting the important areas from which questions are frequently asked. It also includes solved papers, practice questions, and tips for effective preparation.

4. Mathematics Today: This monthly magazine provides analysis of previous years' UPSC Mathematics Optional papers along with detailed solutions. It also includes articles and expert opinions on important topics, making it a comprehensive resource for aspirants.

5. EduRev: EduRev is an online platform that offers a wide range of resources for UPSC Mathematics Optional preparation. It provides detailed analysis of previous years' papers, including topic-wise distribution, difficulty level, and important concepts. It also offers study materials, videos, and mock tests to help aspirants prepare effectively.

In conclusion, there are several journals and publications, such as Mathematics Spectrum, UPSC Mathematics Optional Magazine, Mathematics Chronicle, Mathematics Today, and EduRev, that provide detailed analysis of previous years' UPSC Mathematics Optional papers. These resources can be immensely helpful for aspirants in understanding the exam pattern, identifying important topics, and practicing questions.