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Search Results: 1 - 10 of 144446 matches for " F. Moia "
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First observation of the hyper superheavy hydrogen 6ΛH
M. Agnello,L. Benussi,M. Bertani,H. C. Bhang,G. Bonomi,E. Botta,M. Bregant,T. Bressani,S. Bufalino,L. Busso,D. Calvo,P. Camerini,B. Dalena,F. De Mori,G. D'Erasmo,F. L. Fabbri,A. Feliciello,A. Filippi,E. M. Fiore,A. Fontana,H. Fujioka,P. Genova,P. Gianotti,N. Grion,V. Lucherini,S. Marcello,N. Mirfakhrai,F. Moia,O. Morra,T. Nagae,H. Outa,A. Pantaleo,V. Paticchio,S. Piano,R. Rui,G. Simonetti,R. Wheadon,A. Zenoni,A. Gal
Physics , 2012, DOI: 10.1016/j.nuclphysa.2012.02.015
Abstract: Three candidate events of the neutron-rich hypernucleus 6{\Lambda}H were uniquely identified in the FINUDA experiment at DA{\Phi}NE, Frascati, by observing {\pi}+ mesons from the (K-stop,{\pi}+) production reaction on 6Li targets, in coincidence with {\pi}-mesons from 6{\Lambda}H \rightarrow 6He+{\pi}- weak decay. Details of the experiment and the analysis of its data are reported, leading to an estimate of (2.9\pm2.0)\cdot10-6/K- stop for the 6{\Lambda}H production rate times the two-body {\pi}- weak decay branching ratio. The 6{\Lambda}H binding energy with respect to 5H + {\Lambda} was determined jointly from production and decay to be B{\Lambda} = (4.0 \pm 1.1) MeV, assuming that 5H is unbound with respect to 3H + 2n by 1.7 MeV. The binding energy determined from production is higher, in each one of the three events, than that determined from decay, with a difference of (0.98 \pm 0.74) MeV here assigned to the 0+g.s. \rightarrow 1+ excitation. The consequences of this assignment to {\Lambda} hypernuclear dynamics are briefly discussed.
Study of some two-body non-mesonic decays of $^4_Λ$He and $^5_Λ$He
FINUDA Collaboration,M. Agnello,L. Benussi,M. Bertani,H. C. Bhang,G. Bonomi,E. Botta,M. Bregant,T. Bressani,S. Bufalino,L. Busso,D. Calvo,P. Camerini,B. Dalena,F. De Mori,G. D'Erasmo,F. L. Fabbri,A. Feliciello,A. Filippi,E. M. Fiore,A. Fontana,H. Fujioka,P. Genova,P. Gianotti,N. Grion,V. Lucherini,S. Marcello,N. Mirfakhrai,F. Moia,O. Morra,T. Nagae,H. Outa,A. Pantaleo,V. Paticchio,S. Piano,R. Rui,G. Simonetti,R. Wheadon,A. Zenoni
Physics , 2010,
Abstract: The Non-Mesonic (NM) decay of $^4_\Lambda{\mathrm{He}}$ and $^5_\Lambda{\mathrm{He}}$ in two-body channels has been studied by the FINUDA Collaboration. Two-body NM decays of hypernuclei are rare and the existing observations and theoretical calculations are scarce. The $^4_\Lambda{\mathrm{He}}\rightarrow d+d,\; p+t$ decay channels simultaneously observed by FINUDA on several nuclei are compared: the $pt$ channel is the dominant one. The decay yields for the two decay channels are assessed for the first time: they are $(1.37\pm 0.37)\times 10^{-5}/K^-_{stop}$ and $(8.3\pm 1.0)\times 10^{-5}/K^-_{stop}$, respectively. Due to the capability of FINUDA of identifying $^5_\Lambda{\mathrm{He}}$ hypernuclei, a few $^5_\Lambda{\mathrm{He}}\rightarrow d+t$ decay events have also been observed. The branching ratio for this decay channel has been measured for the first time: $(3.0\pm 2.3)\times 10^{-3}$.
An improved determination of the two--nucleon induced non mesonic weak decay of $Λ$-hypernuclei
M. Agnello,L. Benussi,M. Bertani,H. C. Bhang,G. Bonomi,E. Botta,M. Bregant,T. Bressani,S. Bufalino,L. Busso,D. Calvo,P. Camerini,B. Dalena,F. De mori,G. D'erasmo,F. L. Fabbri,A. Feliciello,A. Filippi,E. M. Fiore,H. Fujioka,P. Genova,P. Gianotti,N. Grion,V. Lucherini,S. Marcello,N. Mirfakhrai,F. Moia,P. Montagna,O. Morra,T. Nagae,H. Outa,A. Pantaleo,V. Paticchio,S. Piano,R. Rui,G. Simonetti,R. Wheadon,A. Zenoni,G. Garbarino
Physics , 2011,
Abstract: The decay of $\Lambda$-hypernuclei without pion emission, known as Non Mesonic Weak Decay (NMWD), gives an effective tool to investigate $\Delta$S=1 four-baryon interactions. It was theoretically suggested that the two-nucleon induced mechanism could play a substantial role in reproducing the observed NMWD decay rates and nucleon spectra, but at present no direct evidence of such a mechanism has been obtained. The FINUDA experiment, exploiting the possibility to detect both charged and neutral particles coming from the hypernucleus decay, has allowed us to deduce the relative weight of the two nucleon induced decay rate to the total NMWD rate. The value of $\Gamma_{2N}$/$\Gamma_{NMWD}$=0.24$\pm$${0.03_{stat}}^{+0.03_{sys}}_{{-{0.02_{sys}}}}$ has been deduced, with an error reduced by a factor more than two compared with the previous assessment.
Direct experimental evidence of the weak $Λn p \rightarrow n n p$ hypernucleus decay
M. Agnello,L. Benussi,M. Bertani,H. C. Bhang,G. Bonomi,E. Botta,M. Bregant,T. Bressani,S. Bufalino,L. Busso,D. Calvo,P. Camerini,B. Dalena,F. De Mori,G. D'Erasmo,F. L. Fabbri,A. Feliciello,A. Filippi,E. M. Fiore,A. Fontana,H. Fujioka,P. Genova,P. Gianotti,N. Grion,V. Lucherini,S. Marcello,N. Mirfakhrai,F. Moia,O. Morra,T. Nagae,H. Outa,A. Pantaleo,V. Paticchio,S. Paino,R. Rui,G. Simonetti,R. Wheadon,A. Zenoni
Physics , 2011,
Abstract: A direct experimental evidence of the occurrence of the weak reaction $\Lambda np\rightarrow nnp$ in nuclei has been obtained by the FINUDA experiment. Three events have been found that can be attributed to $^{7}_{\Lambda}$Li and $^{9}_{\Lambda}$Be two nucleon-induced non mesonic weak decays. The kinematic analysis of such events is presented here.
Evidence for 6ΛH
M. Agnello,L. Benussi,M. Bertani,H. C. Bhang,G. Bonomi,E. Botta,M. Bregant,T. Bressani,S. Bufalino,L. Busso,D. Calvo,P. Camerini,B. Dalena,F. De Mori,G. D'Erasmo,F. L. Fabbri,A. Feliciello,A. Filippi,E. M. Fiore,A. Fontana,H. Fujioka,P. Genova,P. Gianotti,N. Grion,V. Lucherini,S. Marcello,N. Mirfakhrai,F. Moia,O. Morra,T. Nagae,H. Outa,A. Pantaleo,V. Paticchio,S. Piano,R. Rui,G. Simonetti,R. Wheadon,A. Zenoni,A. Gal
Physics , 2011, DOI: 10.1103/PhysRevLett.108.042501
Abstract: Evidence for the neutron-rich hypernucleus 6{\Lambda}H is presented from the FINUDA experiment at DA{\Phi}NE, Frascati, studying ({\pi}+, {\pi}-) pairs in coincidence from the K- +6Li \rightarrow 6 H+{\pi}+ production reaction followed by 6{\Lambda}H \rightarrow 6He + {\pi}- weak decay. The production rate of 6{\Lambda}H undergoing this two-body {\pi}- decay is determined to be (2.9\pm2.0)\cdot10-6/K-. Its binding energy, evaluated jointly from production and decay, is B{\Lambda}(6{\Lambda}H) = (4.0\pm1.1) MeV with respect to 5H+{\Lambda}. A systematic difference of (0.98 \pm 0.74) MeV between B{\Lambda} values derived separately from decay and from production is tentatively assigned to the 6{\Lambda}H 0+g.s. \rightarrow 1+ excitation.
Search for the neutron-rich hypernucleus 9ΛHe
M. Agnello,L. Benussi,M. Bertani,H. C. Bhang,G. Bonomi,E. Botta,M. Bregant,T. Bressani,S. Bufalino,L. Busso,D. Calvo,P. Camerini,B. Dalena,F. De Mori,G. D Erasmo,F. L. Fabbri,A. Feliciello,A. Filippi,E. M. Fiore,A. Fontana,H. Fujioka,P. Genova,P. Gianotti,N. Grion,V. Lucherini,S. Marcello,N. Mirfakhrai,F. Moia,O. Morra,T. Nagae,H. Outa,A. Pantaleo,V. Paticchio,S. Piano,R. Rui,G. Simonetti,R. Wheadon A. Zenoni,A. Gal
Physics , 2012, DOI: 10.1103/PhysRevC.86.057301
Abstract: Search for the neutron-rich hypernucleus 9LHe is reported by the FINUDA experiment at DAFNE, INFN-LNF, studying (pi+, pi-) pairs in coincidence from the K-stop + 9Be --> 9LHe + pi+ production reaction followed by 9LHe --> 9Li + pi- weak decay. An upper limit of the production rate of 9LHe undergoing this two-body pi- decay is determined to be (2.3 +/- 1.9) 10-6/K-stop at 90% confidence level.
Pediatric Obesity and Vitamin D Deficiency: A Proteomic Approach Identifies Multimeric Adiponectin as a Key Link between These Conditions
Gillian E. Walker, Roberta Ricotti, Marta Roccio, Stefania Moia, Simonetta Bellone, Flavia Prodam, Gianni Bona
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0083685
Abstract: Key circulating molecules that link vitamin D (VD) to pediatric obesity and its co-morbidities remain unclear. Using a proteomic approach, our objective was to identify key molecules in obese children dichotomized according to 25OH-vitamin D (25OHD) levels. A total of 42 obese children (M/F = 18/24) were divided according to their 25OHD3 levels into 25OHD3 deficient (VDD; n = 18; 25OHD<15 ng/ml) or normal subjects (NVD; n = 24; >30 ng/ml). Plasma proteomic analyses by two dimensional (2D)-electrophoresis were performed at baseline in all subjects. VDD subjects underwent a 12mo treatment with 3000 IU vitamin D3 once a week to confirm the proteomic analyses. The proteomic analyses identified 53 “spots” that differed between VDD and NVD (p<0.05), amongst which adiponectin was identified. Adiponectin was selected for confirmational studies due to its tight association with obesity and diabetes mellitus. Western Immunoblot (WIB) analyses of 2D-gels demonstrated a downregulation of adiponectin in VDD subjects, which was confirmed in the plasma from VDD with respect to NVD subjects (p<0.035) and increased following 12mo vitamin D3 supplementation in VDD subjects (p<0.02). High molecular weight (HMW) adiponectin, a surrogate indicator of insulin sensitivity, was significantly lower in VDD subjects (p<0.02) and improved with vitamin D3 supplementation (p<0.042). A direct effect in vitro of 1α,25-(OH)2D3 on adipocyte adiponectin synthesis was demonstrated, with adiponectin and its multimeric forms upregulated, even at low pharmacological doses (10?9 M) of 1α,25-(OH)2D3. This upregulation was paralleled by the adiponectin interactive protein, DsbA-L, suggesting that the VD regulation of adiponectin involves post-transciptional events. Using a proteomic approach, multimeric adiponectin has been identified as a key plasma protein that links VDD to pediatric obesity.
The $A(K^-_{stop},π^\pmΣ^\mp)A'$ reaction on p-shell nuclei
FINUDA Collaboration,M. Agnello,L. Benussi,M. Bertani,H. C. Bhang,G. Bonomi,E. Botta,M. Bregant,T. Bressani,S. Bufalino,L. Busso,D. Calvo,P. Camerini,B. Dalena,F. DeMori,G. D'Erasmo,F. L. Fabbri,A. Feliciello,A. Filippi,E. M. Fiore,A. Fontana,H. Fujioka,P. Genova,P. Gianotti,N. Grion,V. Lucherini,S. Marcello,N. Mirfakhrai,F. Moia,P. Montagna,O. Morra,T. Nagae,H. Outa,A. Pantaleo,V. Paticchio,S. Piano,R. Rui,G. Simonetti,R. Wheadon,A. Zenoni
Physics , 2011, DOI: 10.1016/j.physletb.2011.09.076
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).
Hypernuclear spectroscopy with K$^-$ at rest on $^7$Li, $^9$Be, $^{13}$C and $^{16}$O
FINUDA Collaboration,M. Agnello,L. Benussi,M. Bertani,H. C. Bhang,G. Bonomi,E. Botta,M. Bregant,T. Bressani,S. Bufalino,L. Busso,D. Calvo,P. Camerini,B. Dalena,F. De Mori,G. D'Erasmo,F. L. Fabbri,A. Feliciello,A. Filippi,E. M. Fiore,A. Fontana,H. Fujioka,P. Genova,P. Gianotti,N. Grion,V. Lucherini,S. Marcello,N. Mirfakhrai,F. Moia,P. Montagna,O. Morra,T. Nagae,H. Outa,A. Pantaleo,V. Paticchio,S. Piano,R. Rui,G. Simonetti,R. Wheadon,A. Zenoni
Physics , 2010, DOI: 10.1016/j.physletb.2011.02.060
Abstract: The FINUDA experiment collected data to study the production of hypernuclei on different nuclear targets. The hypernucleus formation occurred through the strangeness-exchange reaction $K^-_{stop} + \; ^AZ \rightarrow \; ^A_{\Lambda}Z + \pi^-$. From the analysis of the momentum of the emerging $\pi^-$, binding energies and formation probabilities of $^7_{\Lambda}$Li, $^9_{\Lambda}$Be, $^{13}_{\Lambda}$C and $^{16}_{\Lambda}$O have been measured and are here presented. The behavior of the formation probability as a function of the atomic mass number A is also discussed.
Prospects for measuring the gravitational free-fall of antihydrogen with emulsion detectors
AEgIS Collaboration,S. Aghion,O. Ahlén,C. Amsler,A. Ariga,T. Ariga,A. S. Belov,G. Bonomi,P. Br?unig,J. Bremer,R. S. Brusa,L. Cabaret,C. Canali,R. Caravita,F. Castelli,G. Cerchiari,S. Cialdi,D. Comparat,G. Consolati,J. H. Derking,S. Di Domizio,L. Di Noto,M. Doser,A. Dudarev,A. Ereditato,R. Ferragut,A. Fontana,P. Genova,M. Giammarchi,A. Gligorova,S. N. Gninenko,S. Haider,J. Harasimovicz,S. D. Hogan,T. Huse,E. Jordan,L. V. J?rgensen,T. Kaltenbacher,J. Kawada,A. Kellerbauer,M. Kimura,A. Knecht,D. Krasnicky,V. Lagomarsino,A. Magnani,S. Mariazzi,V. A. Matveev,F. Moia,G. Nebbia,P. Nédélec,M. K. Oberthaler,N. Pacifico,V. Petrácek,C. Pistillo,F. Prelz,M. Prevedelli,C. Regenfus,C. Riccardi,O. R?hne,A. Rotondi,H. Sandaker,P. Scampoli,A. Sosa,J. Storey,M. A. Subieta Vasquez,M. Spacek,G. Testera,D. Trezzi,R. Vaccarone,C. P. Welsch,S. Zavatarelli
Physics , 2013, DOI: 10.1088/1748-0221/8/08/P08013
Abstract: The main goal of the AEgIS experiment at CERN is to test the weak equivalence principle for antimatter. AEgIS will measure the free-fall of an antihydrogen beam traversing a moir\'e deflectometer. The goal is to determine the gravitational acceleration g for antihydrogen with an initial relative accuracy of 1% by using an emulsion detector combined with a silicon micro-strip detector to measure the time of flight. Nuclear emulsions can measure the annihilation vertex of antihydrogen atoms with a precision of about 1 - 2 microns r.m.s. We present here results for emulsion detectors operated in vacuum using low energy antiprotons from the CERN antiproton decelerator. We compare with Monte Carlo simulations, and discuss the impact on the AEgIS project.
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