APS » PROLA » Phys. Rev. Lett. » Volume 86 » Issue 10

Phys. Rev. Lett. 86, 1982 - 1985 (2001)

Measurement of the B(E2) of Λ7Li and Shrinkage of the Hypernuclear Size
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K. Tanida et al.
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Featured in Phys. Rev. Focus Received 28 August 2000

We report on the first measurement of a hypernuclear γ-transition probability. γ rays emitted in the E2(5/2+→1/2+) transition of Λ7Li 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, 5.8-0.7+0.9±0.7 ps, was then converted into the reduced transition probability [ B(E2)] to be B(E2;5/2+→1/2+)  =  3.6±0.5-0.4+0.5 e2 fm4. 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 Λ7Li is smaller than the 6Li nucleus in the free space.


©2001 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v86/p1982
DOI: 10.1103/PhysRevLett.86.1982
PACS: 21.80.+a, 21.10.Tg, 23.20.-g, 27.20.+n

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