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Oral presentation

Measurements of neutron capture cross sections using a 4$$pi$$Ge spectrometer at the J-PARC/MLF/NNRI

Harada, Hideo; Furutaka, Kazuyoshi; Goko, Shinji; Kimura, Atsushi; Kin, Tadahiro; Kitatani, Fumito; Koizumi, Mitsuo; Nakamura, Shoji; Ota, Masayuki; Oshima, Masumi; et al.

no journal, , 

The measurements of neutron capture cross sections have been started using a 4$$pi$$Ge spectrometer at the neutron nucleus reaction instrument (NNRI) in the J-PARC materials and life science facility (MLF). First set of test measurements using the spectrometer at the J-PARC/MLF/NNRI have been performed for radioactive samples such as Cm-244, etc. The initial test experiments have demonstrated the capability of measuring the neutron capture cross section of Cm-244 with a sample mass of less than 1mg. In this talk, we will report preliminary results of the initial experiments, and discuss the new capability and future perspectives. * Present study is the result of "Study on nuclear data by using a high intensity pulsed neutron source for advanced nuclear system" entrusted to Hokkaido University by the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT).

Oral presentation

Fission of heavy $$Lambda$$ hypernuclei with the Skyrme-Hartree-Fock approach

Minato, Futoshi; Hagino, Koichi*; Chiba, Satoshi

no journal, , 

It has been shown that the shape of a few deformed nuclei change toward spherical when a $$Lambda$$ particle is added to them. This is caused because the interaction between a $$Lambda$$ particle and a nucleon is attractive. This fact has motivated us to investigate the influence of $$Lambda$$ particle on the fission of heavy nuclei. We will discuss the fission-related phenomena of heavy $$Lambda$$ hypernuclei with the constraint Skyrme-Hartree-Fock+BCS (SHF+BCS) method. We employ a Skyrme-type interaction for the $$Lambda N$$ interaction and assume adiabaticity, that is, the $$Lambda$$ particle is assumed to be in the lowest state at all deformations. Our result confirms that the $$Lambda$$ particle is stuck to the heavier fission fragment, which is consistent with the experimental result of CERN. We will also discuss the deformation of heavy $$Lambda$$ hypernuclei and the $$Lambda$$ particle motion inside the core nuclei.

Oral presentation

Nuclear photon scattering experiments by quasi-monochromatic, linearly polarized light sources

Shizuma, Toshiyuki; Hayakawa, Takehito; Ogaki, Hideaki; Toyokawa, Hiroyuki*; Komatsubara, Tetsuro*; Kikuzawa, Nobuhiro; Tamii, Atsushi*; Nakada, Hitoshi*

no journal, , 

The knowledge of the M1 response allows one to elucidate the details of nuclear dynamics. It is also important for the estimate neutral current neutrino-nucleus cross sections for supernova explosion. Low-lying electromagnetic transitions can be studied by the method of nuclear resonance fluorescence (NRF). Recently, it has been shown that quasi-monochromatic, linearly polarized photon beams from inverse laser Compton scattering has considerably increased experimental sensitivity and to enable one to detect the fine structure of relatively weak M1 transitions. In this report, results of the NRF measurements on $$^{208}$$Pb using a linearly polarized photon beam will be presented. The M1 resonance below the neutron separation energy is resolved into several individual transitions. The experimental results are compared with an estimation of self-consistent random phase approximation using a semi-realistic interaction.

Oral presentation

$$alpha$$-$$gamma$$ coincidence spectroscopy of $$^{259}$$Rf using a mixed Cf target

Asai, Masato; Tsukada, Kazuaki; Kasamatsu, Yoshitaka*; Sato, Tetsuya; Toyoshima, Atsushi; Ishii, Yasuo; Takahashi, Ryuta; Nagame, Yuichiro; Ishii, Tetsuro; Nishinaka, Ichiro; et al.

no journal, , 

$$gamma$$ rays following the $$alpha$$ decay of $$^{259}$$Rf have been observed for the first time by means of $$alpha$$-$$gamma$$ coincidence spectroscopy. $$^{259}$$Rf was produced via the $$^{251}$$Cf($$^{12}$$C,4n)$$^{259}$$Rf reaction at the JAEA tandem accelerator. Two $$gamma$$ lines were observed at 97.3 and 146.7 keV in coincidence with the 8770 keV $$alpha$$ transition of $$^{259}$$Rf. The energy differences and intensities of these $$gamma$$ transitions, which are very similar to those in the $$alpha$$ decay of $$^{257}$$No with the same neutron number N = 155, allow us to assign the 3/2$$^{+}$$[622] configuration to the 146.7 keV level in $$^{255}$$No as well as to the ground state of $$^{259}$$Rf. This result indicates that the order of neutron orbitals should be inverted between $$^{255}$$Fm and $$^{257}$$No in $$N=155$$ isotones.

Oral presentation

Evolution of shell and nuclear structure in the neutron rich region

Utsuno, Yutaka

no journal, , 

no abstracts in English

Oral presentation

Beta-decay measurement of $$^{46}$$Cr

Wakabayashi, Yasuo; Yamaguchi, Hidetoshi*; Hashimoto, Takashi*; Hayakawa, Seiya*; Kurihara, Yuzo*; Binh, D.*; Kahl, D.*; Kubono, Shigeru*; Nishimura, Shunji*; Gono, Yasuyuki*; et al.

no journal, , 

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