Intense 31–35Ar beams produced with a nanostructured CaO target at ISOLDE

Ramos, J.P.; Gottberg, A.; Mendonça, Tânia; Seiffert, C.; Senos, A.M.R.; Fynbo, H. O. U.; Tengblad, O.; Briz, J. A.; Lund, M. V.; Koldste, G. T.; Carmona-Gallardo, M.; Pesudo, V.; Stora, T.

doi:10.1016/j.nimb.2013.12.009

Cited by 19 publications

(25 citation statements)

References 23 publications

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“…In fact, we recently reported very stable and in many cases higher CaO isotope yields than ever obtained at CERN, using the results of the present sintering study to select the target operation temperature [25].…”

Section: Introductionmentioning

confidence: 72%

Sintering kinetics of nanometric calcium oxide in vacuum atmosphere

Ramos

Fernandes

Stora

et al. 2015

Ceramics International

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Section: Introductionmentioning

confidence: 72%

Sintering kinetics of nanometric calcium oxide in vacuum atmosphere

Ramos

Fernandes

Stora

et al. 2015

Ceramics International

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“…After the acceptance of the paper the authors became aware of the publication of new results regarding the effects of scattering limiting the attainable precision in nuclear beta decay measurements with implanted sources [57][58][59], and of the production of intense [31][32][33][34][35] Ar beams with a nanostructured CaO target [60].…”

Section: Note Added In Proofsmentioning

confidence: 99%

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

et al. 2016

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Abstract. The first high-statistics and high-resolution data set for the integrated recoil-ion energy spectrum following the β + decay of 35 Ar has been collected with the WITCH retardation spectrometer located at CERN-ISOLDE. Over 25 million recoil-ion events were recorded on a large-area multichannel plate (MCP) detector with a time-stamp precision of 2 ns and position resolution of 0.1 mm due to the newly upgraded data acquisition based on the LPC Caen FASTER protocol. The number of recoil ions was measured for more than 15 different settings of the retardation potential, complemented by dedicated background and half-life measurements. Previously unidentified systematic effects, including an energy-dependent efficiency of the main MCP and a radiation-induced time-dependent background, have been identified and incorporated into the analysis. However, further understanding and treatment of the radiation-induced background requires additional dedicated measurements and remains the current limiting factor in extracting a betaneutrino angular correlation coefficient for 35 Ar decay using the WITCH spectrometer.

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“…Furthermore, the 35 Ar half-life of T 1/2 = 1.775(4) s represents a good tradeoff between the preparation of the sample in the Penning trap and the collection of statistics through its β decay. 35 Ar is also produced in large quantities at ISOLDE [26] (2.0×10 8 ions/μC [27]), and nuclear structure-related effects are well known for their superallowed mirror decay [25]. Finally it has a stable daughter isotope and a simple decay scheme.…”

Section: Methodsmentioning

confidence: 99%

“…Mass separation of both species was not possible in the WITCH cooler trap nor in REXTRAP due to the too-high chlorine contamination and the large number of ions involved (1×10 5 ). The development of a nanostructured CaO target and a different target cleaning procedure reduced the amount of chlorine atoms to a negligible level while achieving a greater yield of 35 Ar ions [27].…”

Section: A Technical Improvementsmentioning

confidence: 99%

Firstβ−νcorrelation measurement from the recoil-energy spectrum of Penning trappedAr35ions

et al. 2014

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We demonstrate a novel method to search for physics beyond the standard model by determining the β-ν angular correlation from the recoil-ion energy distribution after β decay of ions stored in a Penning trap. This recoil-ion energy distribution is measured with a retardation spectrometer. The unique combination of the spectrometer with a Penning trap provides a number of advantages, e.g., a high recoil-ion count rate and low sensitivity to the initial position and velocity distribution of the ions and completely different sources of systematic errors compared to other state-of-the-art experiments. Results of a first measurement with the isotope 35 Ar are presented. Although currently at limited precision, we show that a statistical precision of about 0.5% is achievable with this unique method, thereby opening up the possibility of contributing to state-of-the-art searches for exotic currents in weak interactions.

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Intense 31–35Ar beams produced with a nanostructured CaO target at ISOLDE

Cited by 19 publications

References 23 publications

Sintering kinetics of nanometric calcium oxide in vacuum atmosphere

Sintering kinetics of nanometric calcium oxide in vacuum atmosphere

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

Firstβ−νcorrelation measurement from the recoil-energy spectrum of Penning trappedAr35ions

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