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Journal Articles

Measurement of the angular distribution of $$gamma$$-rays after neutron capture by $$^{139}$$La for a T-violation search

Okudaira, Takuya; Shimizu, Hirohiko*; Kitaguchi, Masaaki*; Hirota, Katsuya*; Haddock, C. C.*; Ito, Ikuya*; Yamamoto, Tomoki*; Endo, Shunsuke*; Ishizaki, Kohei*; Sato, Takumi*; et al.

EPJ Web of Conferences, 219, p.09001_1 - 09001_6, 2019/12

https://doi.org/10.1051/epjconf/201921909001

Parity violating effects enhanced by up to 10$$^6$$ times have been observed in several neutron induced compound nuclei. There is a theoretical prediction that time reversal (T) violating effects can also be enhanced in these nuclei implying that T-violation can be searched for by making very sensitive measurements. However, the enhancement factor has not yet been measured in all nuclei. The angular distribution of the (n,$$gamma$$) reaction was measured with $$^{139}$$La by using a germanium detector assembly at J-PARC, and the enhancement factor was obtained. From the result, the measurement time to achieve the most sensitive T-violation search was estimated as 1.4 days, and a 40% polarized $$^{139}$$La target and a 70% polarized $$^3$$He spin filter whose thickness is 70 atm$$cdot$$cm are needed. Therefore high quality $$^3$$He spin filter is developed in JAEA. The measurement result of the (n,$$gamma$$) reaction at J-PARC and the development status of the $$^3$$He spin filter will be presented.

Oral presentation

Laser pulse shaping in mid-infrared region and its application for molecular science

Tsubouchi, Masaaki; Momose, Takamasa*

no journal, , 

Pulse shaping has been known as one of the essential technologies for coherent control of atoms and molecules. In particular, it has been recently suggested that the manipulation of molecular rovibrational wave packets in the ground electronic state may realize the coherent control of thermal chemical reactions or the quantum gate operation in quantum information processes. The femtosecond pulse shaping in the mid-infrared region is indispensable for this purpose, and has been developed continuously. In this presentation, we demonstrate the precise arbitrary pulse shaping and its characterization of mid-infrared radiation toward rovibrational wave packet manipulation. We have developed the cross-correlation frequency-resolved optical gating (XFROG) as a simple but convenient pulse characterization method in the mid-infrared region.

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