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Moon, T. J.*; 谷田 聖; Belle Collaboration*; 他203名*
Physical Review D, 103(11), p.L111101_1 - L111101_9, 2021/06
被引用回数：23 パーセンタイル：82.70(Astronomy & Astrophysics)We report results from a study of the spin and parity of using a 
data sample collected by the Belle detector at the KEKB asymmetric-energy 
collider. The decay angle distributions in the chain 
are analyzed to determine the spin of this charmed-strange baryon. The angular distributions strongly favor the spin 
over 
or 
, under an assumption that the lowest partial wave dominates in the decay. We also measure the ratio of decay branching fractions ![$$R={mathcal{B}[ Xi_{c}(2970)^+ to Xi_c(2645)^{0}pi^{+} ]} $$](/search/images/ERJD0402NVQXI0DDMFWHWQT3LMQFYWDJL33WG5JIGI2TOMBJLYVSAXDUN2QFYWDJL3RSQMRWGQ0SSXT1GB4VY2DJLZ3SW5JALV4SAJA.gif)
/ ![$${ mathcal{B}[ Xi_{c}(2970)^+ to Xi_c^{prime0}pi^{+} ]} $$](/search/images/ER3SAXDNMF0GQY1BNR3UE5K1EBOFQ0K5PNRX0KBSHE1TAKK4FMQFY3DPEBOFQ0K5MNPHWXDQOJUW0ZJQPVOHA0K4PMVX0IC3PUQCI.gif)
=1.67 
, where the last uncertainty is due to possible isospin-symmetry-breaking effects. This 
value favors the spin-parity 
with the spin of the light-quark degrees of freedom 
. This is the first determination of the spin and parity of a charmed-strange baryon.
Kim, S. H.*; Hwang, S.; Ahn, J. K.*; 江川 弘行; 早川 修平; Hong, B.*; 細見 健二; 今井 憲一; Kim, M. H.*; Lee, J. Y.*; et al.
Nuclear Instruments and Methods in Physics Research A, 795, p.39 - 44, 2015/09
被引用回数：4 パーセンタイル：30.80(Instruments & Instrumentation)We have developed a time-of-flight (ToF) array consisting of 24 plastic scintillators for triggering and timing measurements in a series of planned experiments to study double-strangeness hadronic and nuclear systems at the K1.8 beamline of J-PARC. Each ToF scintillator is 180 cm long with a cross-section of 8
3 cm
and is read out by H1949-50 photomultiplier tubes at both ends. The timing and attenuation properties of the scintillators are measured using cosmic-ray muons and 
rays from 
. The cosmic-ray muon events are triggered by three pairs of 120-cm-long plastic scintillators, sandwiching the ToF array. The intrinsic time resolutions of the scintillators are estimated to be in the range 60-100 ps, which is adequate for reliable separation between 
and 
at 1.2 GeV/
. The attenuation length is measured to be approximately 210 cm, which is half that for a bulk scintillator.
Sn explored with the long-lived isomer in 
PdWatanabe, H.*; Lorusso, G.*; 西村 俊二*; Otsuka, T.*; Ogawa, K.*; Xu, Z. Y.*; 炭竃 聡之*; S
derstrm, P.-A.*; Doornenbal, P.*; Li, Z.*; et al.
Physical Review Letters, 113(4), p.042502_1 - 042502_6, 2014/07
被引用回数：25 パーセンタイル：76.28(Physics, Multidisciplinary)A new isomer with a half-life of 23.0(8) ms has been identified in Pd at 2406 keV excitation. The proposed spin and parity configuration is 10
, with maximally aligned configuration of two 
neutron hole. -decay from the long-lived isomer was also observed to populated excited states at high spins in Ag. The small energy difference between the 10 and 7
isomers in Pd was interpreted in the frame of the monopole shift of the 1 neutron orbit. The effects of the monopole interaction on the evolution of single-neutron energies below Sn are discussed in terms of central and tensor forces.
