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RISS 인기검색어
- 검색키워드
- 저자 : R. A. Bark (검색결과 4 건)
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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>
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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.
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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.
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Collective Bands Built on the Proton h11/2 and the Neutron h11/2 Orbitals in Odd-odd I
C.-B. Moon,G. D. Dracoulis,R. A. Bark,A. P. Byrne,P. A. Davidson,A. N. Wilson,A. M. Baxter,T. Kib edi,G. J. Lane 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.I
The excited states of the doubly-odd 124I, 122I, and 120I nuclei have been studied by using in-beam gamma-ray spectroscopy with the 122Sn(7Li,5n), the 120Sn(7Li,5n), and the 118Sn(6Li,4n) reactions at Elab = 54, 58, and 48 MeV, respectively. Beams, which were pulsed on 1 ns separated by 1.7 s, were provided by the 14UD Pelletron accelerator at the Australian National University. In the present work, many collective bands with positive-parity as well as negative-parity have been newly identied and their excitation energies have been denitely established. The positive-parity collective bands built on the 10+ state in these doubly odd I could be interpreted as being associated with the h11=2h11=2 conguration.
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