Measurement of the B(e2) of (7)(lambda)Li and shrinkage of the hypernuclear size.
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.
Tanida
K
K
Department of Physics, University of Tokyo, Japan.
Tamura
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Abe
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Akikawa
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Araki
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Bhang
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Hashimoto
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Imai
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Kakiguchi
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Miyoshi
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Ozawa
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Satoh
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Sawafta
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Sekimoto
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Takahashi
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Xia
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Zhou
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Zhu
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