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TlStryjczyk, M.*; Andel, B.*; Andreyev, A. N.; Cubiss, J.*; Pakarinen, J.*; 他43名*
Physical Review C, 102(2), p.024322_1 - 024322_9, 2020/08
Decay spectroscopy of the long-lived states in Tl has been performed at ISOLDE, CERN. The 
decay from the low-spin (2
) state in Tl was observed for the first time and a half-life was determined. Based on the -decay energy, the relative positions of the long-lived states were fixed, with the (2) state as the ground state, the 7
state at 77(56) keV, and the 10
state at 451(56) keV. The level scheme of the internal decay of the Tl(10) state, which was known to decay solely through emission of 374-keV 
-ray transition, was extended and a lower limit for the 
-decay branching b
5.9(3)% was determined. The extracted retardation factors for the decay of the 10 state were compared to the available data in neighboring odd-odd thallium isotopes indicating the importance of the 
d
shell in the isomeric decay and significant structure differences between 
Tl and Tl.
hypernucleus in the J-PARC E13 experiment中川 真菜美*; 長谷川 勝一; 早川 修平; 細見 健二; 市川 裕大; 今井 憲一; 佐甲 博之; 佐藤 進; 田村 裕和; 谷田 聖; et al.
JPS Conference Proceedings (Internet), 26, p.023005_1 - 023005_3, 2019/11
The 
interaction is not much studied than the 
interaction. To understand the interaction, we study 
hypernuclei. As for the hypernucleus, only the ground state of has been observed. To obtain more information about the interaction, the excited state should be studied. Therefore, we measure the missing-mass of the 
He
reaction at 
GeV/
and 
2-14
at the J-PARC K1.8 beam line. The ground state of is observed whereas a peak of the excited states is not observed. We also observe suppression of the quasi-free process at smaller angles.
collisions at 
=200 GeVAidala, C.*; 長谷川 勝一; 今井 憲一; 永宮 正治; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他431名*
Physical Review D, 95(11), p.112001_1 - 112001_15, 2017/06
被引用回数：5 パーセンタイル：56.96(Astronomy & Astrophysics)The cross section and transverse single-spin asymmetries of 
and 
from open heavy-flavor decays in polarized collisions at = 200 GeV were measured by the PHENIX experiment during 2012 at the Relativistic Heavy Ion Collider. Because heavy-flavor production is dominated by gluon-gluon interactions at = 200 GeV, these measurements offer a unique opportunity to obtain information on the trigluon correlation functions. The measurements are performed at forward and backward rapidity (
) over the transverse momentum range of 
GeV/ for the cross section and 
GeV/ for the asymmetry measurements. The obtained cross section is compared to a fixed-order-plus-next-to-leading-log perturbative-quantum-chromodynamics calculation. The asymmetry results are consistent with zero within uncertainties, and a model calculation based on twist-3 three-gluon correlations agrees with the data.
