Lifetime Measurement of Λ12C, Λ28Si, and ΛFe hypernuclei

被引：76

作者：

Bhang, H ^{[1
]}

Ajimura, S

Aoki, K

Hasegawa, T

Hashimoto, O

Hotchi, H

Kim, YD

Kishimoto, T

Maeda, K

Noumi, H

Ohta, Y

Omata, K

Outa, H

Park, H

Sato, Y

Sekimoto, M

Shibata, T

Takahashi, T

Youn, M

机构：

[1] Seoul Natl Univ, Dept Phys, Seoul 151742, South Korea

[2] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

[3] KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050801, Japan

[4] Univ Tokyo, Grad Sch Sci, Tokyo 1130033, Japan

[5] Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.81.4321

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have measured lifetimes of Lambda hypernuclei over a broad mass range explicitly identifying Lambda hypernuclear production in the (pi(+),K+) reaction. The obtained results are tau(C-12(Lambda)) = 231 +/- 15 ps, tau(Si-28(Lambda)) = 206 +/- 12 ps, and tau(Fe-Lambda) = 215 +/- 14 ps. The lifetimes of Lambda hypernuclei over the mass region from carbon to iron are found almost constant at about 80% of that of free Lambda within the statistical uncertainties. The short-range nature of the nonmesonic weak decay process, which is dominant in heavy Lambda hypernuclei, is possibly responsible for the observed weak hypernuclear mass dependence. [S0031-9007(98)07604-2].

引用

页码：4321 / 4324

页数：4

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