Nuclear Data Analysis and Evaluation Updates in India

Centre Report from NSDD-India VECC, Kolkata Gopal Mukherjee: VECC, Kolkata Ashok Kumar Jain:Amity Inst. Nucl. Sc. & Tech., Amity University, Noida Sukhjeet Singh Dhindsa: Akal University, Talwandi Sabo, Punjab Sushil Kr. Rathi: Akal University, Talwandi Sabo, Punjab Paresh K. Joshi: HBCSE, Tata Inst. Fundamental Research, Mumbai Anagha Chakraborty: Visva Bharati University, Santiniketan, West Bengal Assigned mass chains: A = 215 229 Involved in the following activities: -ray spectroscopy Experiments Other Contributors (contributed in the past): Suresh Kumar: Delhi University Swapan Kr. Basu: VECC, Kolkata (ex) Sudeb Bhattacharya: SINP, Kolkata (ex) Ritwika Chakrabarti: Mumbai Univ. Mass A Chain Evaluations: Assigned and others Review of mass chain Horizontal Evaluations Code development and Training

Mass Chain Evaluation A = 222 Taken up for evaluation at the IAEA-ICTP Workshop during October 03-14, 2022 Authors: Balraj Singh,M.S.Basunia, Jun Chen, P. Dimitriou, B.M.S. Amro, S. Basu, S. Das, Diwanshu, A.Karmakar, M.J.Lazaric, S.R.Leblond, S.S. Nayak, C.Ngwetsheni, A. Rathi, P.S. Rawat, B. Rohila, and V. Vallet Cutoff Date: September 25, 2023 Status: Published Nuclear Data Sheets 192 (2023) 315 421 (December 2023)

Mass Chain Evaluation A=226 Sushil Kumar, Sukhjeet Singh, B. Singh, A.K. Jain The nuclear structure and decay data of 11 nuclides (Po, At, Rn, Fr, Ra, Ac, Th, Pa, U, Np, and Am) have been updated. A summary of the experimental data included in the updated version is given below: Status: Completed, most recent files available with Late Dr. B. Singh

Mass Chain Evaluation Evaluation of Other Mass Chains In addition to the Assigned (A = 215 219) mass chains, following other mass chains have been / being evaluated A = 24 Authors: M. Shamsuzzoha Basunia, Anagha Chakraborty Cutoff Date: March 31, 2022 Nucl. Data Sheets 186 (2022) 3- 26 A = 30 M.S. Basunia and A. Chakraborty Being Evaluated (working on the reviewer s comments) A = 25 M.S. Basunia and A. Chakraborty Under Review

Horizontal Evaluation I. Review of magnetic-and antimagnetic-rotational structures in nuclei Sushil Kumar, Sukhjeet Singh, Balraj Singh, A.K. Jain https://arxiv.org/abs/2303.00499 History: 1. First evaluation was published in 2000: Amita, A.K. Jain, and B. Singh, At. Data and Nucl. Data Tables, 74, 283 (2000) 2. Updated in 2006 (unpublished): Amita, B. Singh, P. Agarwal, and A.K. Jain Present update: 225 magnetic-rotational (MR or Shears) structures spread over 114 nuclides, and 37 antimagnetic-rotational (AMR) structures in 27 nuclei Location of the nuclei: Many of them are located at or near the magic numbers, mostly for protons. 88 MR bands are known for the Pb (Z=82) nuclei, and 27AMR band in Pd, Cd and In nuclei. Level lifetime: Level lifetime data are available for: 11 MR bands (out of a total of 30) in the A=58-87 region, 26 MR bands (out of a total of 56) in the A=100-112 region 21 MR bands (out of a total of 62) in the A=124-146 region, and 14 MR bands (out of a total of 77) in the A=189-206 region. 14AMR bands in 12 nuclei (out of a total of 37 bands in 27 nuclei) Status: Completed (to be submitted toAtomic Data and Nuclear Data Tables)

So far, the Lightest nucleus to have MR band So far, the Heaviest nucleus to have MR band

Horizontal Evaluation II. Nuclear radius parameters (r0) for even-even nuclei from alpha decay Sushil Kumar, Sukhjeet Singh, B. Singh, A.K. Jain Update of the previous work [2020Si16]. In this work, the spin-independent part of Preston s equations is used to deduce the radius parameters of even-even alpha emitters. Major updates: The alpha decay Q-values, parent half-lives, branching (% ) and alpha Intensities (I ) have been updated for 44, 21, 08, and 12 nuclides since the cutoff of the previous update. To deduced r0 parameters, the Evaluated Nuclear Structure Data File (ENSDF) analysis code AlphaHF (developed by Dr. Jun Chen) was used. This code can handle asymmetric uncertainty in parent half-life and branching and resolve a major drawback of the earlier Alphad program. Table 1: Comparison of presently calculated radius parameters with the previous version (2020Si16). Status: Ongoing, working on this project with Dr. Jun Chen)

Funding Dept. of Atomic Energy (DAE), India BRNS project to Sukhjeet Singh Dhindsa Amount: INR 278,000 (~ Euro 31,000) Completed IAEA CRP to Anagha Chakraborty Amount: Euro 12,000

Future Plans Mass A Chain Evaluations Submission of A = 226 evaluation Completion of A = 221 and A = 225 Publication of A = 25 and A = 30 evaluation (in collaboration with S. Basunia) Horizontal Evaluations Submission of MR/AMR band evaluation Table of three-quasiparticle rotational bands in deformed nuclei 153 A 187-an updated supplement New horizontal evaluations Training Workshop Planning for the 3rd NSDD Workshop in India in 2025

Publications 2023GA02 (2023): S. Garg, B. Maheshwari, B. Singh, Y. Sun, A. Goel, A.K. Jain: Atlas of nuclear isomers-Second edition At.Data Nucl.Data Tables 150, 101546 2023NI05 A.L.Nichols, P.Dimitriou, A.Algora, M.Fallot, L.Giot, F.G. Kondev, T. Yoshida, M.Karny, G.Mukherjee, B.C. Rasco, K. P. Rykaczewski, A.A. Sonzogni, J.L. Tain Improving fission-product decay data for reactor applications: part I-decay heat Eur.Phys.J. A 59, 78 (2023) 2023SI22 B.Singh, M.S.Basunia, J.Chen, P.Dimitriou, B.M.S.Amro, S. Basu, S.Das, A.Karmakar, M.J.Lazaric, S.R.Leblond, S.S.Na yak, C.Ngwetsheni, A.Rathi, P.S.Rawat, B.Rohila, V.Vallet Nuclear Structure and Decay Data for A=222 Isobars Nucl.Data Sheets 192, 315 (2023) 2022BA40 M.S.Basunia, A.Chakraborty Nuclear Data Sheets for A=24 Nucl.Data Sheets 186, 3 (2022) Review of magnetic-and antimagnetic-rotational structures in nuclei Sushil Kumar, Sukhjeet Singh, Balraj Singh, A.K. Jain

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