Enhanced <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>B</mi><mo>(</mo><mi>E</mi><mn>3</mn><mo>)</mo></mrow></math> strength observed in <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>La</mi><mprescripts></mprescripts><none></none><mn>137</mn></mmultiscripts></math>

Md. S. R. Laskar; R. Palit; E. Ideguchi; T. Inakura; S. N. Mishra; F. S. Babra; S. Bhattacharya; D. Choudhury; Biswajit Das; B. Das; P. Dey; U. Garg; A. K. Jain; A. Kundu; D. Kumar; D. Negi; S. C. Pancholi; S. Rajbanshi; S. Sihotra

doi:10.1103/PhysRevC.104.L011301

Letter

Enhanced $B (E 3)$ strength observed in ${}^{137}{La}$

Md. S. R. Laskar ¹, R. Palit ¹, E. Ideguchi ², T. Inakura ³, S. N. Mishra^1,4, F. S. Babra¹, S. Bhattacharya⁵, D. Choudhury ⁶, Biswajit Das ¹ et al.

B. Das ¹, P. Dey¹, U. Garg ⁷, A. K. Jain⁸, A. Kundu¹, D. Kumar⁹, D. Negi ¹, S. C. Pancholi ¹⁰, S. Rajbanshi¹¹, and S. Sihotra⁹

¹Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai 400005, India
²Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan
³Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan
⁴Indian Institute of Science Education and Research, Berhampur-760010, India
⁵Department of Pure & Applied Physics, Guru Ghasidas Vishwavidyalaya, Koni, Bilaspur 495009, India
⁶Department of Physics, Indian Institute of Technology, Ropar, Punjab 140001, India
⁷Physics Department, University of Notre Dame, Notre Dame, Indiana 46556, USA
⁸Amity Institute of Nuclear Science & Technology, Amity University, Noida 201301, UP, India
⁹Department of Physics, Panjab University, Chandigarh 160014, India
¹⁰Inter University Accelerator Centre, New Delhi-110067, India
¹¹Department of Physics, Presidency University, Kolkata-700073, India

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Phys. Rev. C 104, L011301 – Published 22 July, 2021

DOI: https://doi.org/10.1103/PhysRevC.104.L011301

Abstract

The ${}^{137}{La}$ nucleus was populated by the reaction ${}^{130}{Te} ({}^{11}B, 4 n$ ) at 40-MeV beam energy and the lifetime of the $11 / 2^{-}$ state at $1004.6 keV$ was measured using a hybrid array of HPGe clover and ${LaBr}_{3}$ (Ce) detectors by electronic fast-timing technique, providing the value $T_{1 / 2} = 263 \pm 12 ps$ . The reduced transition probability $B (E 3) = 23.3 \pm 2.4 W . u .$ is found to be significantly larger compared to the values observed in lighter odd- $A$ La isotopes. The experimentally determined $B (E 3)$ value is compared with theoretical calculations of random-phase approximation which explains the enhanced transition probability to be arising from higher contribution of the $g_{9 / 2}$ orbital to the proton transition density.

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Enhanced $B (E 3)$ strength observed in ${}^{137}{La}$

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Enhanced B(E3) strength observed in La137

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Enhanced $B (E 3)$ strength observed in ${}^{137}{La}$