Observation of ^186mTa

Observation of 186m Ta 1 first-author 1 2 1 corresp Corresponding author. Tel.: 0931 4969301; E-mail: yuansg@impcas.ac.cn Corresponding author. Tel.: 0931 4969301; E-mail: yuansg@impcas.ac.cn yuansg@impcas.ac.cn 1 3 1 1 1 1 Institute of Modern Physics, the Chinese Academy of Sciences, Lanzhou 730000, China Institute of Modern Physics, the Chinese Academy of Sciences, Lanzhou 730000, China China Institute of Atomic Energy, Beijing 102413, China China Institute of Atomic Energy, Beijing 102413, China School of Physics,Peking University, Beijing 100871, China School of Physics,Peking University, Beijing 100871, China Unreported tantalum isomer 186m Ta has been produced through the reaction 186 W(n,p) by irradiation of nat W with 14 MeV neutrons. The activity of 186m Ta and 186 Ta was measured using HPGe detectors and several X-γ as well as γ-γ coincidence arrangements. The 186m Ta has been identified by means of measuring known γ rays from 186 Ta β-decay. The half-life of 186m Ta has been determined to be (1.5±0.1) min. 186m Ta Neutron reaction γ(X)-γ coincidence β-decay References Meissner F , Hild T , Kunze V , et al . Phys. Rev. C , 1995 , 51 : 1558 Phys. Rev. C Al-Garni S D , Regan P H , Walker P M , et al . Phys. Rev. C , 2004 , 69 : 024320 Phys. Rev. C Meyer B S , Howard W M , Mathews G J , et al . Phys. Rev. C , 1989 , 39 : 1876 Phys. Rev. C Genevey J , Ibrahim F , Pinston J A , et al . Phys.Rev. C , 1999 , 59 : 82 Phys.Rev. C Poe A J . Phil. Mag . 1955 , 46 : 1165 Phil. Mag Pathak B P , Murty K S N , Mukherjee S K , et al . Phys. Rev. C , 1970 , 1 : 1477 Phys. Rev. C Caplar R , Udovicic I , Holub E , et al . Z. Phys. A , 1983 , 313 : 227 Z. Phys. A Ryves T B , Kolkowski P , Hooley A C . Ann. Nucl. Energy , 1990 , 17 : 107 Ann. Nucl. Energy Gopych M P , Gopych P M , Zalyubovsky I I . Bull. Rus. Acad. Sci. Phys ., 1997 , 61 : 323 Bull. Rus. Acad. Sci. Phys Baglin C M . Nucl. Data Sheets , 1997 , 82 : 1 Nucl. Data Sheets Browne E . Nucl. Data Sheets , 1995 , 74 : 165 Nucl. Data Sheets 10.1016/S1001-8042(06)60004-3 O571.22,O571.31 + 5 Supported by the National Natural Science Foundation of China (No.10575118) 2005-10-24 2006-02-20 2021-01-19 2006 Nuclear Science and Techniques 01 17