Correspondence of electron spectra from photoionization and nuclear internal conversion

Wark, D.; Bartlett, R. J.; Bowles, T. J.; Robertson, R. G. H.; Sivia, D.S.; Trela, W.J.; Wilkerson, J. F.; Brown, G. S.; Crasemann, Bernd; Sorensen, S. L.; Schaphorst, Stephen J.; Knapp, David A.; Henderson, J. R.; Tulkki, Jukka; Åberg, T.

doi:10.1103/physrevlett.67.2291

Cited by 37 publications

(38 citation statements)

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“…The continuous rise of the curve from zero at threshold is an indication that the satellites originate in a SO, rather than SU, process, since the later results in an intensity jump at the threshold (Å berg, 1972;Armen et al, 1985;Deutsch et al, 1996;Fritsch et al, 1998;Heiser et al, 1994). This is in full accord with the predicted intensity contribution of p1% (Deutsch et al, 1996;Fritsch et al, 1998) for SU in our case, as extrapolated from RMCDF calculations for Ar (Dyall, 1983;Mukoyama and Ito, 1994) and Kr (Wark et al, 1991). Note, however, that a KO process, the crosssection of which also rises continuously from zero, could also be a possible contributor.…”

Section: Article In Presssupporting

confidence: 87%

“…The dashed line yields R N ¼ 0.135, on top of the constant SU contribution, 0.127, observed for 8982pE excitation p8989 eV. This R N , the high-energy limit of R, is somewhat higher than the sudden-regime SO probability of 0.10 calculated for Kr (Wark et al, 1991;Schaphorst et al, 1993), but very close to the 0.1570.02 measured for Ar (Armen et al, 1985;Levin et al, 1990). We conclude therefore that the Thomas model agrees well with our data, in line with similar conclusions for outer-shell SO measurements in Ne, Ar (Heiser et al, 1994) and the measurements of Sternemann et al (2000) on Ge.…”

Section: [3d] à1 Spectator Transitionsmentioning

confidence: 70%

“…This, in turn, is due to the low cross-sections of ME transitions in atoms even in the isothermal regime, and their even lower crosssections near threshold. The few existing studies employ mostly electron emission (Armen et al, 1985;Wark et al, 1991), X-ray absorption (Deutsch and Hart, 1986;Gomilsek et al, 2001;Schaphorst et al, 1993), and photoion (Doppelfeld et al, 1993;Levin et al, 1990) spectra. Most of the atoms studied until the last few years were low-Z (mostly light alkali metals) and inert gas atoms, which require only relatively simple calculations.…”

Section: Introductionmentioning

confidence: 99%

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The evolution of inner-shell multielectronic X-ray spectra from threshold to saturation for low- to high-Z atoms

Diamant

Huotari

Hämäläinen

et al. 2006

Radiation Physics and Chemistry

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Section: Article In Presssupporting

confidence: 87%

Section: [3d] à1 Spectator Transitionsmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

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The evolution of inner-shell multielectronic X-ray spectra from threshold to saturation for low- to high-Z atoms

Diamant

Huotari

Hämäläinen

et al. 2006

Radiation Physics and Chemistry

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“…The high resolution and statistics together with the low background of our experiment allow for the first time to reduce the problems associated with including *2 Some evidence also seems to exist that shake off probabilities measured in conversion electron spectra [24] exceed calculated ones [25]. ' 3 For footnote 3, see next page.…”

Section: First Publ In: Physicsmentioning

confidence: 99%

Improved limit on the electron-antineutrino rest mass from tritium β-decay

et al. 1993

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The endpoint region of the P-spectrum of tritium was remeasured by an electrostatic spectrometer with magnetic guiding field. It enabled the search for a rest mass of the electron-antineutrino with improved precision. The result is in: = -39 f 34,t,t f lSsysf ( e~/ c~)~, from which an upper limit of m, < 7.2 ev/c2 may be derived. The experiment yields the 'atomic mass difference m (T) -rn ( 3~e ) =-18 591 f 3 ev/c2.The cjuestion of a no*-vanishing neutrino rest mass is of fundamental importance in .particle and astrophysics. It therefore caused considerable excitement when Lubimov and collaborators [1',2] published a finite value for the electron-antineutrino rest mass m, obtained from a measurement of the endpoint region of the P-decay of tritium with a new, dedicated spectrometer of high resolution and luminosity [ 3 ] . It took a number of years until this result was checked with equivalent instrume~lts by groups in Ziirich [4] and Los Alamos [5] and disproved due to essential improvements of source and data analysis [6,7]. At present, it seems that this generation of experiments is capable of reaching a precision of am: = 100 (ev/c2 l 2 (see table 3 ) .A radically different type of P-spectrometer was proposed independently at several places [8,9]. It acts as an electrostatic filter guiding the electrons adiabatically along the,.lines of an inhomogeneous magnetic field. If the source is placed in a strong magnetic field Bo a n d the retarding potential Uo reaches its maximum in a much weaker magnetic field B1, the full forward solid angle of electfons emitted with energy E is analyzed with a filter width of AE = (BI /Bo) E. This is due to the adiabatic transformation of transverse cyclotron energy E l around the B-lines into longitudinal energy Ell along the B-lines by the magnetic field gradient reducing E l (which cannot, be analyzed electrostatically) in proportion to the magnetic field. Based on this principle,~two somewhat different spectrometers have been set up in recent years at INR in Troitzk [ 101 and at Mainz University. For details of the design, function and performance of the Mainz solenoid retarding spectrometer (SRS) and for further references see refs. [ l l, 121.The experiment described here was performed under the follo-wing conditions. The source is placed at a field Bs = 0.96B0,' slightly in front of the field maximum of the source solenoid which is set to Bo = 2.4 T, limiting the accepted polar angles to 19 < 78". The magnetic field reaches its minimum BI = 8 x T in the symmetry plane of the spectrometer, where Uo maximizes. Retardation of the electrons and reacceleration after the filter is provided by two sets of electrodes arranged symmetrically around the central one. Under these conditions the rise of the transmission from 0 to 1 within the interval E (1 -BI / B o ) G eUd d E is given by [12] Elsevier Science Publishers B.V.

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“…Each trigger resulted in a 5-ms-long time series of phasequadrature samples of a 40-MHz bandwidth, including 1 ms prior to the trigger. The center of the bandwidth was alternately chosen such that either the 17-or 30.4-keV krypton emissions, and their associated excitations to higher-energy bound states (shakeup) or to the continuum (shakeoff), would be included [22]. The results, shown in Fig.…”

Section: Prl 114 162501 (2015) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

Cyclotron Radiation from One Electron

Huber

2015

Physics

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It has been understood since 1897 that accelerating charges must emit electromagnetic radiation. Although first derived in 1904, cyclotron radiation from a single electron orbiting in a magnetic field has never been observed directly. We demonstrate single-electron detection in a novel radio-frequency spectrometer. The relativistic shift in the cyclotron frequency permits a precise electron energy measurement. Precise beta electron spectroscopy from gaseous radiation sources is a key technique in modern efforts to measure the neutrino mass via the tritium decay end point, and this work demonstrates a fundamentally new approach to precision beta spectroscopy for future neutrino mass experiments. For over a century, nuclear decay electron spectroscopy has played a pivotal role in the understanding of nuclear physics. Early measurements of the continuous β-decay spectrum [1] provided the first evidence of the existence of the weak force and the neutrino [2], and immediately hinted that the neutrino mass is small. Continuing this tradition, present efforts to directly measure the mass of the neutrino rely on precision spectroscopy of the β-decay energy spectrum of 3 H. Because the value of the neutrino mass is an input to the standard model of particle physics as well as precision cosmology, a precision measurement of the neutrino mass would represent a significant advance in our description of nature.The sensitivity of 3 H -based neutrino mass measurements has been improving over the past 80 years as a result of increasingly powerful electron spectrometry techniques [3][4][5][6]. The most sensitive experiments to date place a limit on the electron-flavor-weighted neutrino mass m β ≤ 2.05 eV=c 2 at 95% C.L. [7][8][9], m 2 β ¼

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Correspondence of electron spectra from photoionization and nuclear internal conversion

Cited by 37 publications

References 10 publications

The evolution of inner-shell multielectronic X-ray spectra from threshold to saturation for low- to high-Z atoms

The evolution of inner-shell multielectronic X-ray spectra from threshold to saturation for low- to high-Z atoms

Improved limit on the electron-antineutrino rest mass from tritium β-decay

Cyclotron Radiation from One Electron

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