Hashimoto T, Aikawa S, Akaishi T, Asano H, Bazzi M, Bennett D A, Berger M, Bosnar D, Butt A D, Curceanu C, Doriese W B, Durkin M S, Ezoe Y, Fowler J W, Fujioka H, Gard J D, Guaraldo C, Gustafsson F P, Han C, Hayakawa R, Hayano R S, Hayashi T, Hays-Wehle J P, Hilton G C, Hiraiwa T, Hiromoto M, Ichinohe Y, Iio M, Iizawa Y, Iliescu M, Ishimoto S, Ishisaki Y, Itahashi K, Iwasaki M, Ma Y, Murakami T, Nagatomi R, Nishi T, Noda H, Noumi H, Nunomura K, O'Neil G C, Ohashi T, Ohnishi H, Okada S, Outa H, Piscicchia K, Reintsema C D, Sada Y, Sakuma F, Sato M, Schmidt D R, Scordo A, Sekimoto M, Shi H, Shirotori K, Sirghi D, Sirghi F, Suzuki K, Swetz D S, Takamine A, Tanida K, Tatsuno H, Trippl C, Uhlig J, Ullom J N, Yamada S, Yamaga T, Yamazaki T, Zmeskal J
Advanced Science Research Center, Japan Atomic Energy Agency (JAEA), Tokai 319-1184, Japan.
RIKEN Cluster for Pioneering Research, RIKEN, Wako 351-0198, Japan.
Phys Rev Lett. 2022 Mar 18;128(11):112503. doi: 10.1103/PhysRevLett.128.112503.
We have measured the 3d→2p transition x rays of kaonic ^{3}He and ^{4}He atoms using superconducting transition-edge-sensor microcalorimeters with an energy resolution better than 6 eV (FWHM). We determined the energies to be 6224.5±0.4(stat)±0.2(syst) eV and 6463.7±0.3(stat)±0.1(syst) eV, and widths to be 2.5±1.0(stat)±0.4(syst) eV and 1.0±0.6(stat)±0.3(stat) eV, for kaonic ^{3}He and ^{4}He, respectively. These values are nearly 10 times more precise than in previous measurements. Our results exclude the large strong-interaction shifts and widths that are suggested by a coupled-channel approach and agree with calculations based on optical-potential models.
我们使用能量分辨率优于6电子伏特（半高宽）的超导转变边缘传感器微热量计，测量了K介子³He和⁴He原子的3d→2p跃迁X射线。我们确定，对于K介子³He和⁴He，其能量分别为6224.5±0.4（统计）±0.2（系统）电子伏特和6463.7±0.3（统计）±0.1（系统）电子伏特，宽度分别为2.5±1.0（统计）±0.4（系统）电子伏特和1.0±0.6（统计）±0.3（统计）电子伏特。这些值比之前的测量精度高出近10倍。我们的结果排除了耦合通道方法所暗示的大的强相互作用位移和宽度，并与基于光学势模型的计算结果一致。
