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Various Isomers in Doubly Odd I Isotopes
C.-B. Moon,G. D. Dracoulis,R. A. Bark,A. P. Byrne,P. A. Davidson,T. Kibedi,G. J. Lane,A. N. Wilson 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Isomeric states (Isomers) in odd-odd ^(120)I, ^(122)I, and ^(124)I nuclei have been investigated using in-beam gamma-ray spectroscopy with the ^(118)Sn (^6Li, 4n), ^(120)Sn (^7Li, 5n), and ^(122)Sn (^7Li, 5n) reactions at E_(lab) = 48, 58, and 54 MeV, respectively. Several isomers with half-lives ranging from a few nanoseconds to tens of microseconds have been identified for the first time and the absolute excited energies have been established by linking the low- and high-spin levels through the feeding and decay of the isomers in these nuclei. The properties of the isomers have been discussed in terms of spin traps and high-K isomerism based on two-quasiparticle configurations. The systematics for the absolute excitation energies of the J^π = 7^- and 8^- high-K isomers based on the πg_(9/2) υh_(11/2) configuration are presented for ^(116)I to ^(124)I and compared with the 9/2^+ states in the neighboring odd-A I isotopes.
Decay Schemes of Three-Quasiparticle Isomers in ^(119,121)Sb and ^(121,123)I
C.-B. Moon,G. D. Dracoulis,R. A. Bark,A. P. Byrne,P. A. Davidson,T. Kibedi,G. J. Lane,A. N. Wilson 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The gamma-ray decay of isomers in near spherical ^(119,121)Sb and transitional ^(121,123)I have been studied using γ-ray spectroscopy with ^7Li pulsed beams delivered from 14 UD Pelletron accelerator at the Australian National University. Isomers of J^π = 25/2^+, 19/2^- and 21/2^- with half-lives of a few nanoseconds to hundreds microseconds have been observed at 2.4 < E_x < 2.9 MeV. Decay schemes of the isomers in these nuclei are presented and their properties are interpreted in terms of three quasiparticle configurations based on the two-neutron (h_(11/2))_2 10^+ and (d_(3/2)h_(11/2)) 7^- states in even-A Sn isotones coupled to an extra proton.
Photocleavage of water with a photochemical heterosupramolecular assembly
G. J. Wilson,G. D. Will 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
The application of heterosupramolecular assemblies to device fabrication is discussed. This approach to nanoscale devicearchitecture is versatile with several methods of solar energy conversion examined that allow the evolution of H2 and/or O2 throughvisible solar irradiance. Treatment of industrial waste streams is proposed that would allow the removal of organic pollutants whilstproducing a chemical fuel in the form of pure H2. Also of great potential within this system are the analytical properties of anorganic sensor. By monitoring the photocurrent within the device as organic pollutants degrade, the identication of pollutantspecies and concentrations of mixtures in industrial waste streams could provide a versatile analytical tool.
An AzTEC 1.1-mm survey for ULIRGs in the field of the Galaxy Cluster MS 0451.6−0305
Wardlow, J. L.,Smail, Ian,Wilson, G. W.,Yun, M. S.,Coppin, K. E. K.,Cybulski, R.,Geach, J. E.,Ivison, R. J.,Aretxaga, I.,Austermann, J. E.,Edge, A. C.,Fazio, G. G.,Huang, J.,Hughes, D. H.,Kodama, T.,K Blackwell Publishing Ltd 2010 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.401 No.4
<P>ABSTRACT</P><P>We have undertaken a deep (σ∼ 1.1 mJy) 1.1-mm survey of the <I>z</I>= 0.54 cluster MS 0451.6−0305 using the AzTEC camera on the James Clerk Maxwell Telescope. We detect 36 sources with signal-to-noise ratio (S/N) ≥ 3.5 in the central 0.10 deg<SUP>2</SUP> and present the AzTEC map, catalogue and number counts. We identify counterparts to 18 sources (50 per cent) using radio, mid-infrared, <I>Spitzer</I> InfraRed Array Camera (IRAC) and Submillimetre Array data. Optical, near- and mid-infrared spectral energy distributions are compiled for the 14 of these galaxies with detectable counterparts, which are expected to contain all likely cluster members. We then use photometric redshifts and colour selection to separate background galaxies from potential cluster members and test the reliability of this technique using archival observations of submillimetre galaxies. We find two potential MS 0451−03 members, which, if they are both cluster galaxies, have a total star formation rate (SFR) of ∼100 M<SUB>⊙</SUB> yr<SUP>−1</SUP>– a significant fraction of the combined SFR of all the other galaxies in MS 0451−03. We also examine the stacked rest-frame mid-infrared, millimetre and radio emission of cluster members below our AzTEC detection limit, and find that the SFRs of mid-IR-selected galaxies in the cluster and redshift-matched field populations are comparable. In contrast, the average SFR of the morphologically classified late-type cluster population is nearly three times less than the corresponding redshift-matched field galaxies. This suggests that these galaxies may be in the process of being transformed on the red sequence by the cluster environment. Our survey demonstrates that although the environment of MS 0451−03 appears to suppress star formation in late-type galaxies, it can support active, dust-obscured mid-IR galaxies and potentially millimetre-detected LIRGs.</P>
AzTEC 1.1 mm OBSERVATIONS OF THE MBM12 MOLECULAR CLOUD
Kim, M. J.,Kim, S.,Youn, S.,Yun, M. S.,Wilson, G. W.,Aretxaga, I.,Williams, J. P.,Hughes, D. H.,Humphrey, A.,Austermann, J. E.,Perera, T. A.,Mauskopf, P. D.,Magnani, L.,Kang, Y.-W. IOP Publishing 2012 The Astrophysical journal Vol.746 No.1
<P>We present 1.1 mm observations of the dust continuum emission from the MBM12 high-latitude molecular cloud observed with the Astronomical Thermal Emission Camera (AzTEC) mounted on the James Clerk Maxwell Telescope on Mauna Kea, Hawaii. We surveyed 6.34 deg(2) centered on MBM12, making this the largest area that has ever been surveyed in this region with submillimeter and millimeter telescopes. Eight secure individual sources were detected with a signal-to-noise ratio of over 4.4. These eight AzTEC sources can be considered to be real astronomical objects compared to the other candidates based on calculations of the false detection rate. The distribution of the detected 1.1 mm sources or compact 1.1 mm peaks is spatially anti-correlated with that of the 100 mu m emission and the (CO)-C-12 emission. We detected the 1.1 mm dust continuum emitting sources associated with two classical T Tauri stars, LkH alpha 262 and LkH alpha 264. Observations of spectral energy distributions (SEDs) indicate that LkH alpha 262 is likely to be Class II (pre-main-sequence star), but there are also indications that it could be a late Class I (protostar). A flared disk and a bipolar cavity in the models of Class I sources lead to more complicated SEDs. From the present AzTEC observations of the MBM12 region, it appears that other sources detected with AzTEC are likely to be extragalactic and located behind MBM12. Some of these have radio counterparts and their star formation rates are derived from a fit of the SEDs to the photometric evolution of galaxies in which the effects of a dusty interstellar medium have been included.</P>
Moon, B.,Moon, C.-B.,Dracoulis, G.D.,Bark, R.A.,Byrne, A.P.,Davidson, P.A.,Lane, G.J.,Kibé,di, T.,Wilson, A.N.,Yuan, C.,Hong, B. Elsevier 2018 Physics letters: B Vol.782 No.-
<P><B>Abstract</B></P> <P>We report for the first time two distinctive features in the odd–odd nucleus <SUP>120</SUP>I: a pair of doublet bands and a high-spin isomer built on the π <SUB> h 11 / 2 </SUB> ν <SUB> h 11 / 2 </SUB> configuration. For producing the excited states of <SUP>120</SUP>I, a fusion-evaporation reaction <SUP>118</SUP>Sn(<SUP>6</SUP>Li, 4n) at E = l a b 48 MeV was employed. The beam was provided by the 14UD tandem accelerator of the Heavy Ion Accelerator Facility at the Australian National University. The observed doublet structure built on the positive-parity states is the first case and unique in isotopes with Z = 53 . The emerging properties are indicative of the known chiral characteristics, leading to a doubling of states for the π <SUB> h 11 / 2 </SUB> ν <SUB> h 11 / 2 </SUB> configuration. In contrast, the high-spin isomer with a half-life of 49(2) ns at spin-parity <SUP> J π </SUP> = <SUP> 25 + </SUP> can be explained in terms of a noncollective oblate structure with the full alignment of six valence nucleons outside the <SUP>114</SUP>Sn core: three protons <SUP> ( <SUB> g 7 / 2 </SUB> ) 1 </SUP> <SUP> ( <SUB> d 5 / 2 </SUB> ) 1 </SUP> <SUP> ( <SUB> h 11 / 2 </SUB> ) 1 </SUP> and three neutrons <SUP> ( <SUB> h 11 / 2 </SUB> ) 3 </SUP> . This is an outstanding case that reveals a pure single-particle structure consisting of equal numbers of valence protons and neutrons outside the semi-double shell closure of <SUP>114</SUP>Sn with Z = 50 and N = 64 .</P>
Wilson, William C.,Hornig-Do, Hue-Tran,Bruni, Francesco,Chang, Jeong Ho,Jourdain, Alexis A.,Martinou, Jean-Claude,Falkenberg, Maria,Spå,hr, Henrik,Larsson, Nils-Gö,ran,Lewis, Richard J.,Hewit Oxford University Press 2014 Human Molecular Genetics Vol.23 No.23
<P>The p.N478D missense mutation in human mitochondrial poly(A) polymerase (mtPAP) has previously been implicated in a form of spastic ataxia with optic atrophy. In this study, we have investigated fibroblast cell lines established from family members. The homozygous mutation resulted in the loss of polyadenylation of all mitochondrial transcripts assessed; however, oligoadenylation was retained. Interestingly, this had differential effects on transcript stability that were dependent on the particular species of transcript. These changes were accompanied by a severe loss of oxidative phosphorylation complexes I and IV, and perturbation of <I>de novo</I> mitochondrial protein synthesis. Decreases in transcript polyadenylation and in respiratory chain complexes were effectively rescued by overexpression of wild-type mtPAP. Both mutated and wild-type mtPAP localized to the mitochondrial RNA-processing granules thereby eliminating mislocalization as a cause of defective polyadenylation. <I>In vitro</I> polyadenylation assays revealed severely compromised activity by the mutated protein, which generated only short oligo(A) extensions on RNA substrates, irrespective of RNA secondary structure. The addition of LRPPRC/SLIRP, a mitochondrial RNA-binding complex, enhanced activity of the wild-type mtPAP resulting in increased overall tail length. The LRPPRC/SLIRP effect although present was less marked with mutated mtPAP, independent of RNA secondary structure. We conclude that (i) the polymerase activity of mtPAP can be modulated by the presence of LRPPRC/SLIRP, (ii) N478D mtPAP mutation decreases polymerase activity and (iii) the alteration in poly(A) length is sufficient to cause dysregulation of post-transcriptional expression and the pathogenic lack of respiratory chain complexes.</P>