Possible ΔΔ\Delta\Delta dibaryons in the quark cluster model

In the framework of RGM, the binding energy of one channel $\Delta\Delta_{(3,0)}$($d^*$) and $\Delta\Delta_{(0,3)}$ are studied in the chiral SU(3) quark cluster model. It is shown that the binding energies of the systems are a few tens of MeV. The behavior of the chiral field is also investigated by comparing the results with those in the SU(2) and the extended SU(2) chiral quark models. It is found that the symmetry property of the $\Delta\Delta$ system makes the contribution of the relative kinetic energy operator between two clusters attractive. This is very beneficial for forming the bound dibaryon. Meanwhile the chiral-quark field coupling also plays a very important role on binding. The S-wave phase shifts and the corresponding scattering lengths of the systems are also given.Comment: LeTex with 2 ps figure

Weak decays of 4He-Lambda

We measured the lifetime and the mesonic and non-mesonic decay rates of the 4He-Lambda hypernucleus. The hypernuclei were created using a 750 MeV/c momentum K- beam on a liquid 4He target by the reaction 4He(K-,pi-)4He-Lambda. The 4He-Lambda lifetime was directly measured using protons from Lambda p -> n p non-mesonic decay (also referred to as proton-stimulated decay) and was found to have a value of tau = 245 +/- 24 ps. The mesonic decay rates were determined from the observed numbers of pi-'s and pi0's as Gamma_pi-/Gamma_tot = 0.270 +/- 0.024 and Gamma_pi0/Gamma_tot = 0.564 +/- 0.036, respectively, and the values of the proton- and neutron-stimulated decay rates were extracted as Gamma_p/Gamma_tot = 0.169 +/- 0.019 and Gamma_n/Gamma_tot <= 0.032 (95% CL), respectively. The effects of final-state interactions and possible 3-body Lambda N N decay contributions were studied in the context of a simple model of nucleon-stimulated decay. Nucleon-nucleon coincidence events were observed and were used in the determination of the non-mesonic branching fractions. The implications of the results of this analysis were considered for the empirical Delta I = 1/2 rule and the decay rates of the 4H-Lambda hypernucleus.Comment: 15 pages, 11 figures, published in PRC, revised content to match published versio

Gamma-Ray Spectroscopy of Λ16^{16}_\LambdaO and Λ15^{15}_\LambdaN Hypernuclei via the 16^{16}O(K−,π−)(K^-, \pi^-) reaction

he bound-state level structures of the $^{16}_{\Lambda}$O and $^{15}_{\Lambda}$N hypernuclei were studied by $\gamma$-ray spectroscopy using a germanium detector array (Hyperball) via the $^{16}$O ($K^-, \pi^- \gamma$) reaction. A level scheme for $^{16}_{\Lambda}$O was determined from the observation of three $\gamma$-ray transitions from the doublet of states ($2^-$,$1^-$) at $\sim 6.7$ MeV to the ground-state doublet ($1^-$,$0^-$). The $^{15}_{\Lambda}$N hypernuclei were produced via proton emission from unbound states in $^{16}_{\Lambda}$O . Three $\gamma$ -rays were observed and the lifetime of the $1/2^+;1$ state in $^{15}_{\Lambda}$N was measured by the Doppler shift attenuation method. By comparing the experimental results with shell-model calculations, the spin-dependence of the $\Lambda N$ interaction is discussed. In particular, the measured $^{16}_{\Lambda}$O ground-state doublet spacing of 26.4 $\pm$ 1.6 $\pm$ 0.5 keV determines a small but nonzero strength of the $\Lambda N$ tensor interaction.Comment: 22 pages, 17 figure

AA--Dependence of ΛΛ\Lambda\Lambda Bond Energies in Double---Λ\Lambda Hypernuclei

The $A$-dependence of the bond energy $\Delta B_{\Lambda\Lambda}$ of the ${\Lambda\Lambda}$ hypernuclear ground states is calculated in a three-body ${\Lambda + \Lambda + {^{A}Z}}$ model and in the Skyrme-Hartree-Fock approach. Various ${\Lambda\Lambda}$ and $\Lambda$-nucleus or ${\Lambda N}$ potentials are used and the sensitivity of $\Delta B_{\Lambda\Lambda}$ to the interactions is discussed. It is shown that in medium and heavy ${\Lambda\Lambda}$ hypernuclei, $\Delta B_{\Lambda\Lambda}$ is a linear function of $r_{\Lambda}^{-3}$, where $r_\Lambda$ is rms radius of the hyperon orbital. It looks unlikely that it will be possible to extract ${\Lambda\Lambda}$ interaction from the double-$\Lambda$ hypernuclear energies only, the additional information about the $\Lambda$-core interaction, in particular, on $r_{\Lambda}$ is needed.Comment: 11 pages, LaTex, 3 figure

First Measurement of A_N at sqrt(s)=200 GeV in Polarized Proton-Proton Elastic Scattering at RHIC

We report on the first measurement of the single spin analyzing power (A_N) at sqrt(s)=200GeV, obtained by the pp2pp experiment using polarized proton beams at the Relativistic Heavy Ion Collider (RHIC). Data points were measured in the four momentum transfer t range 0.01 < |t| < 0.03 (GeV/c)^2. Our result, averaged over the whole t-interval is about one standard deviation above the calculation, which uses interference between electromagnetic spin-flip amplitude and hadronic non-flip amplitude, the source of A_N. The difference could be explained by an additional contribution of a hadronic spin-flip amplitude to A_N.Comment: 13 pages, 5 figures. New values of polarization errors. Final version submitted to Phys. Lett.

"London is avocado on toast” : the urban imaginaries of the #LondonIsOpen campaign

This article examines the production, representations, and reactions to the #LondonIsOpen campaign to ask how urban imaginaries are produced and what they entail for understanding the city. The analysis considers how the idea of a cosmopolitan, diverse, and multicultural city is framed, what it includes and excludes, and the distinct geographies of the city it produces. It draws on three data sources: documentary analysis of videos used in the campaign; social media analysis of tweets using #LondonIsOpen; and semi-structured interviews with key figures in the campaign team. The main arguments are that the appeal to openness contributes to the versatility of the campaign and the range of responses to it, making it highly adaptable and flexible to respond to current affairs; and that open London is geographically selective and imagined as business focused; trendy; and cosmopolitan. In turn, the reactions to the idea of open London range from seeking a borderless world to anti-migrant rhetoric. Although the campaign represents London as welcoming and inclusive, such welcoming is partial and subject to contestation. The article concludes that over time, the openness of #LondonIsOpen has come to serve multiple political functions and act as a brand for the city

Features of successful academic hospitalist programs: Insights from the SCHOLAR (SuCcessful HOspitaLists in academics and research) project

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/134172/1/jhm2603.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134172/2/jhm2603-sup-0004-suppinfo4.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134172/3/jhm2603-sup-0001-suppinfo1.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134172/4/jhm2603-sup-0010-suppinfo10.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134172/5/jhm2603-sup-0006-suppinfo6.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134172/6/jhm2603-sup-0005-suppinfo5.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134172/7/jhm2603-sup-0009-suppinfo9.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134172/8/jhm2603-sup-0012-suppinfo12.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134172/9/jhm2603-sup-0003-suppinfo3.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134172/10/jhm2603-sup-0002-suppinfo2.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134172/11/jhm2603_am.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134172/12/jhm2603-sup-0008-suppinfo8.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134172/13/jhm2603-sup-0011-suppinfo11.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134172/14/jhm2603-sup-0007-suppinfo7.pd

The politics of in/visibility: carving out queer space in Ul'yanovsk

&lt;p&gt;In spite of a growing interest within sexualities studies in the concept of queer space (Oswin 2008), existing literature focuses almost exclusively on its most visible and territorialised forms, such as the gay scene, thus privileging Western metropolitan areas as hubs of queer consumer culture (Binnie 2004). While the literature has emphasised the political significance of queer space as a site of resistance to hegemonic gender and sexual norms, it has again predominantly focused on overt claims to public space embodied in Pride events, neglecting other less open forms of resistance.&lt;/p&gt;&lt;p&gt; This article contributes new insights to current debates about the construction and meaning of queer space by considering how city space is appropriated by an informal queer network in Ul’ianovsk. The group routinely occupied very public locations meeting and socialising on the street or in mainstream cafés in central Ul’ianovsk, although claims to these spaces as queer were mostly contingent, precarious or invisible to outsiders. The article considers how provincial location affects tactics used to carve out communal space, foregrounding the importance of local context and collective agency in shaping specific forms of resistance, and questioning ethnocentric assumptions about the empowering potential of visibility.&lt;/p&gt