title: Measurement of the B(e2) of (7)(lambda)Li and shrinkage of the hypernuclear size.
abstract: We report on the first measurement of a hypernuclear gamma-transition probability. gamma rays emitted in the E2(5/2(+)-->1/2(+)) transition of (7)(Lambda)Li were detected by a large-acceptance germanium detector array (Hyperball), and the lifetime of the parent state ( 5/2(+)) was determined by the Doppler shift attenuation method. The obtained result, 5.8(+0.9)(-0.7)+/-0.7 ps, was then converted into the reduced transition probability [ B(E2)] to be B(E2;5/2(+)-->1/2(+)) = 3.6+/-0.5(+0.5)(-0.4) e(2) fm(4). Compared with the B(E2) of the corresponding E2(3(+)-->1(+)) transition in the 6Li nucleus, our result gives evidence that the size of the 6Li core in (7)(Lambda)Li is smaller than the 6Li nucleus in the free space.
authors: Department of Physics, University of Tokyo, Japan.
authors: K
authors: K
authors: Tanida
authors: H
authors: H
authors: Tamura
authors: D
authors: D
authors: Abe
authors: H
authors: H
authors: Akikawa
authors: K
authors: K
authors: Araki
authors: H
authors: H
authors: Bhang
authors: T
authors: T
authors: Endo
authors: Y
authors: Y
authors: Fujii
authors: T
authors: T
authors: Fukuda
authors: O
authors: O
authors: Hashimoto
authors: K
authors: K
authors: Imai
authors: H
authors: H
authors: Hotchi
authors: Y
authors: Y
authors: Kakiguchi
authors: J H
authors: JH
authors: Kim
authors: Y D
authors: YD
authors: Kim
authors: T
authors: T
authors: Miyoshi
authors: T
authors: T
authors: Murakami
authors: T
authors: T
authors: Nagae
authors: H
authors: H
authors: Noumi
authors: H
authors: H
authors: Outa
authors: K
authors: K
authors: Ozawa
authors: T
authors: T
authors: Saito
authors: J
authors: J
authors: Sasao
authors: Y
authors: Y
authors: Sato
authors: S
authors: S
authors: Satoh
authors: R I
authors: RI
authors: Sawafta
authors: M
authors: M
authors: Sekimoto
authors: T
authors: T
authors: Takahashi
authors: L
authors: L
authors: Tang
authors: H H
authors: HH
authors: Xia
authors: S H
authors: SH
authors: Zhou
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