Measurement of the lifetime of the first 2$^{\bf +}$ state in $^{124}$Ba

K. Uchiyama; K. Furuno; T. Shizuma; M. Sugita; M. Kato; Y. Tokita; M. Murasaki; N. Hashimoto; H. Takahashi; T. Komatsubara; K. Matsuura; T. Tanaka; Y. Sasaki

doi:doi:10.1007/s100500050084

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2022 Impact factor 2.7

Hadrons and Nuclei

Eur. Phys. J A 2, 13-15

Short note

Measurement of the lifetime of the first 2 $^{\bf +}$ state in ¹²⁴Ba

K. Uchiyama¹ - K. Furuno¹ - T. Shizuma¹ - M. Sugita² - M. Kato¹ - Y. Tokita¹ - M. Murasaki¹ - N. Hashimoto¹ - H. Takahashi¹ - T. Komatsubara¹ - K. Matsuura¹ - T. Tanaka¹ - Y. Sasaki¹

¹ Institute of Physics and Tandem Accelerator Center, University of Tsukuba, Ibaraki, 305-8577, Japan
² Japan Atomic Energy Research Institute, Tokai, Ibaraki, 319-1106, Japan

Received: 23 February 1998 Communicated by B. Herskind

Abstract
The lifetime of the first 2⁺ state in the nucleus ¹²⁴Ba has been measured by $\gamma$ - $\gamma$ coincidence recoil-distance Doppler shift method. The ¹⁰⁹Ag(¹⁹F, 4n)¹²⁴Ba reaction at a beam energy of 75 MeV was employed to populate excited states in ¹²⁴Ba. The mean lifetime was determined to be 275(12) ps using the differential decay curve method. The value of $B({\rm E}2;0_{1}^{+}\rightarrow 2_{1}^{+})$ for ¹²⁴Ba deduced from the lifetime is in reasonable agreement with the prediction of the proton-neutron interacting boson model(IBM-2) without Pauli blocking effect.