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  1. Article ; Online: Evidence for heavy hyperhydrogen (Λ)(6)h.

    Agnello, M / Benussi, L / Bertani, M / Bhang, H C / Bonomi, G / Botta, E / Bregant, M / Bressani, T / Bufalino, S / Busso, L / Calvo, D / Camerini, P / Dalena, B / De Mori, F / D'Erasmo, G / Fabbri, F L / Feliciello, A / Filippi, A / Fiore, E M /
    Fontana, A / Fujioka, H / Genova, P / Gianotti, P / Grion, N / Lucherini, V / Marcello, S / Mirfakhrai, N / Moia, F / Morra, O / Nagae, T / Outa, H / Pantaleo, A / Paticchio, V / Piano, S / Rui, R / Simonetti, G / Wheadon, R / Zenoni, A / Gal, A

    Physical review letters

    2012  Volume 108, Issue 4, Page(s) 42501

    Abstract: Evidence for the neutron-rich hypernucleus (Λ)(6)H is presented from the FINUDA experiment at DAΦNE, Frascati, studying (π+,π-) pairs in coincidence from the K(stop)(-) + (6)Li →(Λ)(6)H + π+ production reaction followed by (Λ)(6)H → (6)He + π- weak decay. ...

    Abstract Evidence for the neutron-rich hypernucleus (Λ)(6)H is presented from the FINUDA experiment at DAΦNE, Frascati, studying (π+,π-) pairs in coincidence from the K(stop)(-) + (6)Li →(Λ)(6)H + π+ production reaction followed by (Λ)(6)H → (6)He + π- weak decay. The production rate of (Λ)(6) undergoing this two-body π- decay is determined to be (2.9 ± 2.0) × 10(-6)/K(stop)(-). Its binding energy, evaluated jointly from production and decay, is BΛ((Λ)(6)H) = (4.0 ± 1.1) MeV with respect to (5)H+Λ. A systematic difference of (0.98 ± 0.74) MeV between BΛ values derived separately from decay and from production is tentatively assigned to the (Λ)(6)H 0(g.s.)(+) → 1+ excitation.
    Language English
    Publishing date 2012-01-27
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.108.042501
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Neutron-rich hypernuclei

    Marcello S. / Mirfakhrai N. / Lucherini V. / Grion N. / Gianotti P. / Genova P. / Fujioka H. / Fontana A. / Fiore E. M. / Filippi A. / Feliciello A. / Fabbri F. L. / D’Erasmo G. / De Mori F. / Dalena B. / Camerini P. / Calvo D. / Busso L. / Bufalino S. /
    Bressani T. / Bregant M. / Bonomi G. / Botta E. / Bhang H. C. / Bertani M. / Benussi L. / Agnello M. / Moia F. / Morra O. / Nagae T. / Outa H. / Pantaleo A. / Paticchio V. / Piano S. / Rui R. / Simonetti G. / Wheadon R. / Zenoni A. / Gal A.

    EPJ Web of Conferences, Vol 37, p

    evidence for 6ΛH and search for 9ΛHe

    2012  Volume 01023

    Abstract: The FINUDA experiment at DAΦNE, Frascati, has found evidence for the neutron-rich hypernucleus 6ΛH studying (π+, π−) pairs in coincidence from the K−stop+6Li → 6ΛH+π+ production reaction followed by 6ΛH → 6He + π− weak decay. The production rate of 6ΛH ... ...

    Abstract The FINUDA experiment at DAΦNE, Frascati, has found evidence for the neutron-rich hypernucleus 6ΛH studying (π+, π−) pairs in coincidence from the K−stop+6Li → 6ΛH+π+ production reaction followed by 6ΛH → 6He + π− weak decay. The production rate of 6ΛH undergoing this two-body π− decay has been found to be (2.9 ± 2.0) · 10−6/K−stop. Its binding energy has been evaluated to be BΛ(6ΛH) = (4.0 ± 1.1) MeV with respect to 5H + Λ, jointly from production and decay. A systematic difference of (0.98 ± 0.74) MeV between BΛ values derived separately from decay and from production has been tentatively assigned to the 6ΛH 0+g.s. → 1+ excitation. A similar investigation has been carried out for the neutron-rich hypernucleus 9ΛHe studying the K−stop + 9Be → 9ΛHe + π+ reaction in coincidence with the 9ΛHe → 9Li + π− weak decay; an upper limit for the production rate of 9ΛHe undergoing the two-body π− decay has been found to be 4.2 · 10−6/K−stop (90% C.L.).
    Keywords Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy
    Language English
    Publishing date 2012-12-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Book ; Online: The $A(K^-_{stop},\pi^\pm\Sigma^\mp)A'$ reaction on p-shell nuclei

    FINUDA Collaboration / Agnello, M. / Benussi, L. / Bertani, M. / Bhang, H. C. / Bonomi, G. / Botta, E. / Bregant, M. / Bressani, T. / Bufalino, S. / Busso, L. / Calvo, D. / Camerini, P. / Dalena, B. / DeMori, F. / D'Erasmo, G. / Fabbri, F. L. / Feliciello, A. / Filippi, A. /
    Fiore, E. M. / Fontana, A. / Fujioka, H. / Genova, P. / Gianotti, P. / Grion, N. / Lucherini, V. / Marcello, S. / Mirfakhrai, N. / Moia, F. / Montagna, P. / Morra, O. / Nagae, T. / Outa, H. / Pantaleo, A. / Paticchio, V. / Piano, S. / Rui, R. / Simonetti, G. / Wheadon, R. / Zenoni, A.

    2011  

    Abstract: This letter is concerned with the study of the $K^-_{stop}A\rightarrow \pi^\pm\Sigma^\mp A'$ reaction in p-shell nuclei, i.e., $^{6,7}Li$, $^9Be$, $^{13}C$ and $^{16}O$. The $\pi^\pm\Sigma^\mp / K^-_{stop}$ emission rates are reported as a function of $A$ ...

    Abstract This letter is concerned with the study of the $K^-_{stop}A\rightarrow \pi^\pm\Sigma^\mp A'$ reaction in p-shell nuclei, i.e., $^{6,7}Li$, $^9Be$, $^{13}C$ and $^{16}O$. The $\pi^\pm\Sigma^\mp / K^-_{stop}$ emission rates are reported as a function of $A$. These rates are discussed in comparison with previous findings. The ratio $\pi^-\Sigma^+/\pi^+\Sigma^-$ in p-shell nuclei is found to depart largely from that on hydrogen, which provides support for large in-medium effects possibly generated by the sub-threshold $\Lambda(1405)$. The continuum momentum spectra of prompt pions and free sigmas are also discussed as well as the $\pi^\pm\Sigma^\mp$ missing mass behavior and the link with the reaction mechanism. The apparatus used for the investigation is the FINUDA spectrometer operating at the DA$\Phi$NE $\phi$-factory (LNF-INFN, Italy).

    Comment: 14 pages, 5 figures, accepted for publication in Phys. Lett. B
    Keywords Nuclear Experiment
    Subject code 612
    Publishing date 2011-09-29
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article: Evidence for a kaon-bound state K(-)pp produced in K(-) absorption reactions at rest.

    Agnello, M / Beer, G / Benussi, L / Bertani, M / Bianco, S / Botta, E / Bressani, T / Busso, L / Calvo, D / Camerini, P / Cerello, P / Dalena, B / De Mori, F / D'Erasmo, G / Di Santo, D / Fabbri, F L / Faso, D / Feliciello, A / Filippi, A /
    Filippini, V / Fiore, E M / Fujioka, H / Gianotti, P / Grion, N / Lucherini, V / Marcello, S / Maruta, T / Mirfakhrai, N / Morra, O / Nagae, T / Olin, A / Outa, H / Pace, E / Palomba, M / Pantaleo, A / Panzarasa, A / Paticchio, V / Piano, S / Pompili, F / Rui, R / Simonetti, G / So, H / Tomassini, S / Toyoda, A / Wheadon, R / Zenoni, A

    Physical review letters

    2005  Volume 94, Issue 21, Page(s) 212303

    Abstract: We have searched for a deeply bound kaonic state by using the FINUDA spectrometer installed at the e(+)e(-) collider DAPhiNE. Almost monochromatic K(-)'s produced through the decay of phi(1020) mesons are used to observe K(-) absorption reactions stopped ...

    Abstract We have searched for a deeply bound kaonic state by using the FINUDA spectrometer installed at the e(+)e(-) collider DAPhiNE. Almost monochromatic K(-)'s produced through the decay of phi(1020) mesons are used to observe K(-) absorption reactions stopped on very thin nuclear targets. Taking this unique advantage, we have succeeded to detect a kaon-bound state K(-)pp through its two-body decay into a Lambda hyperon and a proton. The binding energy and the decay width are determined from the invariant-mass distribution as 115(+6)(-5)(stat)(+3)(-4)(syst) MeV and 67(+14)(-11)(stat)(+2)(-3)(syst) MeV, respectively.
    Language English
    Publishing date 2005-06-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.94.212303
    Database MEDical Literature Analysis and Retrieval System OnLINE

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