Strong-interaction effect measurements in sigma hyperonic atoms of W and Pb

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.47.1263· OSTI ID:6687978

Powers, R J; Eckhause, M; Guss, P P; Hancock, A D; Hertzog, D W; Joyce, D; Kane, J R; Phillips, W C; Vulcan, W F; Welsh, R E; Whyley, R J; Winter, R G ^[1]; Austin, E; Dodson, G W; Miller, J P; O'Brien, F; Roberts, B L; Tieger, D R ^[2]; Sutton, R B ^[3]; Kunselman, R ^[4]

---

1. College of William and Mary, Williamsburg, Virginia 23187 (United States)
2. Boston University, Boston, Massachusetts 02215 (United States)
3. Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213 (United States)
4. University of Wyoming, Laramie, Wyoming 82071 (United States)

Strong-interaction effects have been observed in the x-ray spectra of atoms formed with [Sigma][sup [minus]] hyperons in W and Pb. The spectra were analyzed for energy shifts and broadenings and for yield reductions of the final x-ray transitions before absorption of the [Sigma][sup [minus]] by the nucleus. The results for the 10[ital l][r arrow]9[ital k] transitions of [Sigma][sup [minus]] hyperonic atoms averaged over fine structure components are [sup 184]W: [var epsilon](9[ital k])=214[plus minus]60 eV, [Gamma](9[ital k])=18[plus minus]149 eV, [Gamma](10[ital l])=2[plus minus]2 eV; [sup 208]Pb: [var epsilon](9[ital k])=422[plus minus]56 eV, [Gamma](9[ital k])=428[plus minus]158 eV, [Gamma](10[ital l])=17[plus minus]3 eV, where the strong interaction shift [var epsilon]=[ital E][sub [ital m]][minus][ital E][sub [ital c]], [ital E][sub [ital m]] is the measured transition energy, and [ital E][sub [ital c]] is the transition energy calculated assuming no strong interaction and [Gamma] is the Lorentzian broadening. A four-parameter optical potential representing an effective spin-independent [Sigma][sup [minus]]-nuclear hadronic interaction was fitted by these results in combination with previous data from lower-[ital Z] nuclei.

• OSTI ID: 6687978
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 47:3; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663570 -- Nuclear Mass Ranges-- A=150-189-- (1992-)
663580 -- Nuclear Mass Ranges-- A=190-219-- (1992-)
664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
BARYONS
BETA DECAY RADIOISOTOPES
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
HADRONS
HEAVY NUCLEI
HYPERNUCLEI
HYPERONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEAD 203
LEAD ISOTOPES
NUCLEAR FRAGMENTS
NUCLEI
OPTICAL MODELS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SIGMA BARYONS
SIGMA MINUS PARTICLES
SIGMA PARTICLES
SPECTRA
STABLE ISOTOPES
STRANGE PARTICLES
TUNGSTEN 184
TUNGSTEN ISOTOPES
X-RAY SPECTRA