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La-Ce-
Ce nuclear cosmochronometer of supernova neutrino process'"Hayakawa, Takehito; Shizuma, Toshiyuki; Kajino, Toshitaka*; Ogawa, Kengo*; Nakada, Hitoshi*
Physical Review C, 79(5), p.059802_1 - 059802_2, 2009/05
Times Cited Count：0 Percentile：1.45(Physics, Nuclear)We have proposed a new nuclear cosmochronometer La(T
=102 Gyr)-Ce-Ce for measuring the time elapsed from a supernova 
process episode. La is synthesized by the process. If a 1
excited state exists at energy lower than 72 keV, the 1 state may be a 
unstable isomer and La synthesized by the process is destroyed via the isomer. Recently, Byelikov et al. have measured Gamow-Teller strength distributions in La. It has been presented that this experiment shows that the existence of a low-energy 1 state in La is extremely unlikely. Our calculated result is consistent with their result and we conclude that there is no evidence that suggests the existence of the 1 isomer in La.
La-Ce-Ce nuclear cosmochronometer of supernova neutrino processHayakawa, Takehito; Shizuma, Toshiyuki; Kajino, Toshitaka*; Ogawa, Kengo*; Nakada, Hitoshi*
Physical Review C, 77(6), p.065802_1 - 065802_5, 2008/06
Times Cited Count：14 Percentile：64.91(Physics, Nuclear)no abstracts in English
Ba populated by deep inelastic collisionsShizuma, Toshiyuki; Gan, Z. G.*; Ogawa, Kengo*; Nakada, Hitoshi*; Oshima, Masumi; Toh, Yosuke; Hayakawa, Takehito; Hatsukawa, Yuichi; Sugawara, Masahiko*; Utsuno, Yutaka; et al.
European Physical Journal A, 20(2), p.207 - 210, 2004/04
Times Cited Count：13 Percentile：71.74(Physics, Nuclear)Excited states in Ba, populated in deep-inelastic collisions by the interaction of 450-MeV 
Se ions with a 
La target, have been studied by means of in-beam 
-ray spectroscopy. A new isomer with 
has been identified at an excitation energy of 
MeV. The half-life was determined as 
ns. The extracted 
value is much smaller than those in 
Te and 
Xe. This hindrance is investigated by a shell model calculation.
for the 
doublet in 
CuHou, L.; Ishii, Tetsuro; Asai, Masato; Hori, Junichi; Ogawa, Kengo*; Nakada, Hitoshi*
Physical Review C, 68(5), p.054306_1 - 054306_6, 2003/11
Times Cited Count：4 Percentile：33.69(Physics, Nuclear)Lifetimes of excited states in Cu were measured by the --
coincidence with two BaF
detectors through the decay of Cu
produced by the (
,
) reaction. The halflife of the 2
state at 84~keV was obtained as 7.84(8)~ns, corresponding to the 
value of 0.00777(8)~
. A shell model calculation with a minimum model space of 
gives a good prediction of this value by using experimental g-factors of neighboring nuclei. This small value can be explained by a shell model calculation with the 
model space.
Hayakawa, Takehito; Shizuma, Toshiyuki; Kajino, Toshitaka*; Ogawa, Kengo*; Nakada, Hitoshi*
no journal, ,
no abstracts in English
Hayakawa, Takehito; Shizuma, Toshiyuki; Kajino, Toshitaka*; Ogawa, Kengo*; Nakada, Hitoshi*
no journal, ,
no abstracts in English
Hayakawa, Takehito; Shizuma, Toshiyuki; Kajino, Toshitaka*; Ogawa, Kengo*; Nakada, Hitoshi*
no journal, ,
no abstracts in English
Hayakawa, Takehito; Shizuma, Toshiyuki; Kajino, Toshitaka*; Ogawa, Kengo*; Nakada, Hitoshi*
no journal, ,
no abstracts in English
Hayakawa, Takehito; Shizuma, Toshiyuki; Kajino, Toshitaka*; Ogawa, Kengo*; Nakada, Hitoshi*
no journal, ,
no abstracts in English
