Missing-mass spectroscopy with the Li 6 (π-,K+)X reaction to search for H Λ6

J-PARC E10 Collaboration

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We searched for the bound state of the neutron-rich Λ-hypernucleus HΛ6, using the Li6(π-,K+)X double charge-exchange reaction at a π- beam momentum of 1.2GeV/c at J-PARC. A total of 1.4×1012π- was driven onto a Li6 target of 3.5-g/cm2 thickness. No event was observed below the bound threshold, i.e., the mass of HΛ4+2n, in the missing-mass spectrum of the Li6(π-,K+)X reaction in the 2<θπK<20 angular range. Furthermore, no event was found up to 2.8MeV/c2 above the bound threshold. We obtained the double-differential cross section spectra of the Li6(π-,K+)X reaction in the angular range of 2<θπK<14. An upper limit of 0.56 nb/sr (90% C.L.) was obtained for the production cross section of the HΛ6 hypernucleus bound state. In addition, not only the bound state region, but also the Λ continuum region and part of the Σ- quasifree production region of the Li6(π-,K+) reaction were obtained with high statistics. The present missing-mass spectrum will facilitate the investigation of the Σ - nucleus optical potential for Σ - He5 through spectrum shape analysis.

Original languageEnglish
Article number014005
JournalPhysical Review C
Volume96
Issue number1
DOIs
Publication statusPublished - 2017 Jul 31

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mass spectroscopy
hypernuclei
mass spectra
thresholds
cross sections
charge exchange
statistics
continuums
momentum
neutrons
nuclei

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Missing-mass spectroscopy with the Li 6 (π-,K+)X reaction to search for H Λ6. / J-PARC E10 Collaboration.

In: Physical Review C, Vol. 96, No. 1, 014005, 31.07.2017.

Research output: Contribution to journalArticle

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title = "Missing-mass spectroscopy with the Li 6 (π-,K+)X reaction to search for H Λ6",
abstract = "We searched for the bound state of the neutron-rich Λ-hypernucleus HΛ6, using the Li6(π-,K+)X double charge-exchange reaction at a π- beam momentum of 1.2GeV/c at J-PARC. A total of 1.4×1012π- was driven onto a Li6 target of 3.5-g/cm2 thickness. No event was observed below the bound threshold, i.e., the mass of HΛ4+2n, in the missing-mass spectrum of the Li6(π-,K+)X reaction in the 2<θπK<20 angular range. Furthermore, no event was found up to 2.8MeV/c2 above the bound threshold. We obtained the double-differential cross section spectra of the Li6(π-,K+)X reaction in the angular range of 2<θπK<14. An upper limit of 0.56 nb/sr (90{\%} C.L.) was obtained for the production cross section of the HΛ6 hypernucleus bound state. In addition, not only the bound state region, but also the Λ continuum region and part of the Σ- quasifree production region of the Li6(π-,K+) reaction were obtained with high statistics. The present missing-mass spectrum will facilitate the investigation of the Σ - nucleus optical potential for Σ - He5 through spectrum shape analysis.",
author = "{J-PARC E10 Collaboration} and R. Honda and M. Agnello and Ahn, {Jung Keun} and S. Ajimura and Y. Akazawa and N. Amano and K. Aoki and Bhang, {H. C.} and N. Chiga and M. Endo and P. Evtoukhovitch and A. Feliciello and H. Fujioka and T. Fukuda and S. Hasegawa and Hayakawa, {S. H.} and K. Hosomi and Hwang, {S. H.} and Y. Ichikawa and Y. Igarashi and K. Imai and N. Ishibashi and R. Iwasaki and Joo, {C. W.} and R. Kiuchi and Lee, {J. K.} and Lee, {J. Y.} and K. Matsuda and Y. Matsumoto and K. Matsuoka and K. Miwa and Y. Mizoi and M. Moritsu and T. Nagae and S. Nagamiya and M. Nakagawa and M. Naruki and H. Noumi and R. Ota and Roy, {B. J.} and Saha, {P. K.} and A. Sakaguchi and H. Sako and C. Samanta and V. Samoilov and Y. Sasaki and S. Sato and M. Sekimoto and Y. Shimizu and T. Shiozaki",
year = "2017",
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AU - J-PARC E10 Collaboration

AU - Honda, R.

AU - Agnello, M.

AU - Ahn, Jung Keun

AU - Ajimura, S.

AU - Akazawa, Y.

AU - Amano, N.

AU - Aoki, K.

AU - Bhang, H. C.

AU - Chiga, N.

AU - Endo, M.

AU - Evtoukhovitch, P.

AU - Feliciello, A.

AU - Fujioka, H.

AU - Fukuda, T.

AU - Hasegawa, S.

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AU - Hosomi, K.

AU - Hwang, S. H.

AU - Ichikawa, Y.

AU - Igarashi, Y.

AU - Imai, K.

AU - Ishibashi, N.

AU - Iwasaki, R.

AU - Joo, C. W.

AU - Kiuchi, R.

AU - Lee, J. K.

AU - Lee, J. Y.

AU - Matsuda, K.

AU - Matsumoto, Y.

AU - Matsuoka, K.

AU - Miwa, K.

AU - Mizoi, Y.

AU - Moritsu, M.

AU - Nagae, T.

AU - Nagamiya, S.

AU - Nakagawa, M.

AU - Naruki, M.

AU - Noumi, H.

AU - Ota, R.

AU - Roy, B. J.

AU - Saha, P. K.

AU - Sakaguchi, A.

AU - Sako, H.

AU - Samanta, C.

AU - Samoilov, V.

AU - Sasaki, Y.

AU - Sato, S.

AU - Sekimoto, M.

AU - Shimizu, Y.

AU - Shiozaki, T.

PY - 2017/7/31

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N2 - We searched for the bound state of the neutron-rich Λ-hypernucleus HΛ6, using the Li6(π-,K+)X double charge-exchange reaction at a π- beam momentum of 1.2GeV/c at J-PARC. A total of 1.4×1012π- was driven onto a Li6 target of 3.5-g/cm2 thickness. No event was observed below the bound threshold, i.e., the mass of HΛ4+2n, in the missing-mass spectrum of the Li6(π-,K+)X reaction in the 2<θπK<20 angular range. Furthermore, no event was found up to 2.8MeV/c2 above the bound threshold. We obtained the double-differential cross section spectra of the Li6(π-,K+)X reaction in the angular range of 2<θπK<14. An upper limit of 0.56 nb/sr (90% C.L.) was obtained for the production cross section of the HΛ6 hypernucleus bound state. In addition, not only the bound state region, but also the Λ continuum region and part of the Σ- quasifree production region of the Li6(π-,K+) reaction were obtained with high statistics. The present missing-mass spectrum will facilitate the investigation of the Σ - nucleus optical potential for Σ - He5 through spectrum shape analysis.

AB - We searched for the bound state of the neutron-rich Λ-hypernucleus HΛ6, using the Li6(π-,K+)X double charge-exchange reaction at a π- beam momentum of 1.2GeV/c at J-PARC. A total of 1.4×1012π- was driven onto a Li6 target of 3.5-g/cm2 thickness. No event was observed below the bound threshold, i.e., the mass of HΛ4+2n, in the missing-mass spectrum of the Li6(π-,K+)X reaction in the 2<θπK<20 angular range. Furthermore, no event was found up to 2.8MeV/c2 above the bound threshold. We obtained the double-differential cross section spectra of the Li6(π-,K+)X reaction in the angular range of 2<θπK<14. An upper limit of 0.56 nb/sr (90% C.L.) was obtained for the production cross section of the HΛ6 hypernucleus bound state. In addition, not only the bound state region, but also the Λ continuum region and part of the Σ- quasifree production region of the Li6(π-,K+) reaction were obtained with high statistics. The present missing-mass spectrum will facilitate the investigation of the Σ - nucleus optical potential for Σ - He5 through spectrum shape analysis.

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