Missing-mass spectroscopy with the Li-6(pi(-), K+)X reaction to search for H-6(Lambda)
- Authors
- Honda, R.; Agnello, M.; Ahn, J. K.; Ajimura, S.; Akazawa, Y.; Amano, N.; Aoki, K.; Bhang, H. C.; Chiga, N.; Endo, M.; Evtoukhovitch, P.; Feliciello, A.; Fujioka, H.; Fukuda, T.; Hasegawa, S.; Hayakawa, S. H.; Hosomi, K.; Hwang, S. H.; Ichikawa, Y.; Igarashi, Y.; Imai, K.; Ishibashi, N.; Iwasaki, R.; Joo, C. W.; Kiuchi, R.; Lee, J. K.; Lee, J. Y.; Matsuda, K.; Matsumoto, Y.; Matsuoka, K.; Miwa, K.; Mizoi, Y.; Moritsu, M.; Nagae, T.; Nagamiya, S.; Nakagawa, M.; Naruki, M.; Noumi, H.; Ota, R.; Roy, B. J.; Saha, P. K.; Sakaguchi, A.; Sako, H.; Samanta, C.; Samoilov, V.; Sasaki, Y.; Sato, S.; Sekimoto, M.; Shimizu, Y.; Shiozaki, T.; Shirotori, K.; Soyama, T.; Sugimura, H.; Takahashi, T.; Takahashi, T. N.; Tamura, H.; Tanabe, K.; Tanaka, T.; Tanida, K.; Tokiyasu, A. O.; Tsamalaidze, Z.; Ukai, M.; Yamamoto, T. O.; Yamamoto, Y.; Yang, S. B.; Yoshida, K.
- Issue Date
- 31-7월-2017
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW C, v.96, no.1
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW C
- Volume
- 96
- Number
- 1
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/82782
- DOI
- 10.1103/PhysRevC.96.014005
- ISSN
- 2469-9985
- Abstract
- We searched for the bound state of the neutron-rich Lambda-hypernucleus H-6(Lambda), using the Li-6(pi(-), K+)X double charge-exchange reaction at a pi-beam momentum of 1.2 GeV/c at J-PARC. A total of 1.4 x 10(12) pi(-) was driven onto a Li-6 target of 3.5-g/cm(2) thickness. No event was observed below the bound threshold, i.e., the mass of H-4(Lambda) + 2n, in the missing-mass spectrum of the Li-6(pi(-), K+) X reaction in the 2 degrees < theta(pi K) < 20 degrees angular range. Furthermore, no event was found up to 2.8 MeV/c(2) above the bound threshold. We obtained the double-differential cross section spectra of the Li-6(pi(-), K+)X reaction in the angular range of 2 degrees < theta(pi K) < 14 degrees. An upper limit of 0.56 nb/sr (90% C.L.) was obtained for the production cross section of the H-6(Lambda) hypernucleus bound state. In addition, not only the bound state region, but also the Lambda continuum region and part of the Sigma(-) quasifree production region of the Li-6(pi(-), K+) reaction were obtained with high statistics. The present missing-mass spectrum will facilitate the investigation of the Sigma(-) -nucleus optical potential for Sigma(-) -He-5 through spectrum shape analysis.
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