Measurements of Strong-Interaction Effects in Kaonic-Helium Isotopes at Sub-eV Precision with X-Ray Microcalorimeters

T Hashimoto; S Aikawa; T Akaishi; H Asano; M Bazzi; D A Bennett; M Berger; D Bosnar; A D Butt; C Curceanu; W B Doriese; M S Durkin; Y Ezoe; J W Fowler; H Fujioka; J D Gard; C Guaraldo; F P Gustafsson; C Han; R Hayakawa; R S Hayano; T Hayashi; J P Hays-Wehle; G C Hilton; T Hiraiwa; M Hiromoto; Y Ichinohe; M Iio; Y Iizawa; M Iliescu; S Ishimoto; Y Ishisaki; K Itahashi; M Iwasaki; Y Ma; T Murakami; R Nagatomi; T Nishi; H Noda; H Noumi; K Nunomura; G C O'Neil; T Ohashi; H Ohnishi; S Okada; H Outa; K Piscicchia; C D Reintsema; Y Sada; F Sakuma; M Sato; D R Schmidt; A Scordo; M Sekimoto; H Shi; K Shirotori; D Sirghi; F Sirghi; K Suzuki; D S Swetz; A Takamine; K Tanida; H Tatsuno; C Trippl; J Uhlig; J N Ullom; S Yamada; T Yamaga; T Yamazaki; J Zmeskal; J-PARC E62 Collaboration

doi:10.1103/PhysRevLett.128.112503

Measurements of Strong-Interaction Effects in Kaonic-Helium Isotopes at Sub-eV Precision with X-Ray Microcalorimeters

Phys Rev Lett. 2022 Mar 18;128(11):112503. doi: 10.1103/PhysRevLett.128.112503.

Authors

T Hashimoto^{1

2}, S Aikawa³, T Akaishi⁴, H Asano², M Bazzi⁵, D A Bennett⁶, M Berger⁷, D Bosnar⁸, A D Butt⁹, C Curceanu⁵, W B Doriese⁶, M S Durkin⁶, Y Ezoe¹⁰, J W Fowler⁶, H Fujioka³, J D Gard⁶, C Guaraldo⁵, F P Gustafsson⁷, C Han², R Hayakawa¹⁰, R S Hayano¹¹, T Hayashi¹², J P Hays-Wehle⁶, G C Hilton⁶, T Hiraiwa¹³, M Hiromoto⁴, Y Ichinohe¹⁴, M Iio¹⁵, Y Iizawa³, M Iliescu⁵, S Ishimoto¹⁵, Y Ishisaki¹⁰, K Itahashi², M Iwasaki², Y Ma², T Murakami¹¹, R Nagatomi⁴, T Nishi¹⁶, H Noda¹⁷, H Noumi¹³, K Nunomura¹⁰, G C O'Neil⁶, T Ohashi¹⁰, H Ohnishi¹⁸, S Okada^{2

19}, H Outa², K Piscicchia⁵, C D Reintsema⁶, Y Sada¹⁸, F Sakuma², M Sato¹⁵, D R Schmidt⁶, A Scordo⁵, M Sekimoto¹⁵, H Shi⁷, K Shirotori¹³, D Sirghi⁵, F Sirghi⁵, K Suzuki⁷, D S Swetz⁶, A Takamine², K Tanida¹, H Tatsuno¹⁰, C Trippl⁷, J Uhlig²⁰, J N Ullom⁶, S Yamada¹⁴, T Yamaga², T Yamazaki¹¹, J Zmeskal⁷; J-PARC E62 Collaboration

Affiliations

¹ Advanced Science Research Center, Japan Atomic Energy Agency (JAEA), Tokai 319-1184, Japan.
² RIKEN Cluster for Pioneering Research, RIKEN, Wako 351-0198, Japan.
³ Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.
⁴ Department of Physics, Osaka University, Toyonaka 560-0043, Japan.
⁵ Laboratori Nazionali di Frascati dell' INFN, Frascati I-00044, Italy.
⁶ National Institute of Standards and Technology, Boulder, Colorado 80305, USA.
⁷ Stefan-Meyer-Institut für subatomare Physik, Vienna A-1030, Austria.
⁸ Department of Physics, Faculty of Science, University of Zagreb, Zagreb 10000, Croatia.
⁹ Politecnico di Milano, Dipartimento di Elettronica, Milano 20133, Italy.
¹⁰ Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
¹¹ Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan.
¹² Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan.
¹³ Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki 567-0047, Japan.
¹⁴ Department of Physics, Rikkyo University, Tokyo 171-8501, Japan.
¹⁵ High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan.
¹⁶ RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako 351-0198, Japan.
¹⁷ Department of Earth and Space Science, Osaka University, Toyonaka 560-0043, Japan.
¹⁸ Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan.
¹⁹ Engineering Science Laboratory, Chubu University, Kasugai 487-8501, Japan.
²⁰ Chemical Physics, Lund University, Lund 22100, Sweden.

PMID: 35363014
DOI: 10.1103/PhysRevLett.128.112503

Abstract

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.