A new isomer in 136 Ba populated by deep inelastic collisions

T. Shizuma; Z. G. Gan; K. Ogawa; H. Nakada; M. Oshima; Y. Toh; T. Hayakawa; Y. Hatsukawa; M. Sugawara; Y. Utsuno; Z. Liu

doi:10.1140/epja/i2003-10163-6

EPJ

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2024 Impact factor 2.8

Hadrons and Nuclei

Open Access

Eur. Phys. J. A (2004) 20: 207-210
https://doi.org/10.1140/epja/i2003-10163-6

Letter

A new isomer in ¹³⁶ Ba populated by deep inelastic collisions

T. Shizuma¹^*, Z. G. Gan¹^,2, K. Ogawa³, H. Nakada³, M. Oshima¹, Y. Toh¹, T. Hayakawa¹, Y. Hatsukawa¹, M. Sugawara⁴, Y. Utsuno¹ and Z. Liu²

¹ Japan Atomic Energy Research Institute, 319-1195, Tokai, Ibaraki, Japan
² Institute of Modern Physics, Chinese Academy of Science, 730000, Lanzhou, PRC
³ Chiba University, Inage-ku, 263-8522, Chiba, Japan
⁴ Chiba Institute of Technology, 275-0023, Narashino, Chiba, Japan

^* e-mail: shizuma@popsvr.tokai.jaeri.go.jp

Abstract

Excited states in ¹³⁶Ba, populated in deep inelastic collisions by the interaction of 450 MeV ⁸²Se ions with a ¹³⁹La target, have been studied by means of in-beam $\gamma$ -ray spectroscopy. A new isomer with $I^\pi = (10^ + )$ has been identified at an excitation energy E _x = 3.357 MeV. The half-life was determined as $T_{1/2} = 94\pm10$ ns. The extracted B(E2) value is much smaller than those in ¹³²Te and ¹³⁴Xe. This hindrance is investigated by a shell model calculation.