Hypernuclei-the early days

Davis, D. H.

doi:10.1016/0375-9474(92)90746-7

Cited by 39 publications

(17 citation statements)

References 42 publications

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“…Despite the small systematic error assigned to the emulsion measurements [1], it was shown recently [7] that for p-shell hypernuclei a discrepancy in the range of 400 to 800 keV between the emulsion data [2] and those obtained with the (π + , K + ) reaction [8] exists. This discrepancy could be partially resolved by a correction of the emulsion data for 12 Λ C which served as a calibration point for (π + , K + ) measurements.…”

Section: Binding Energy Of Hypertritonmentioning

confidence: 99%

“…Most binding energies of light hypernuclei (A < 14) are known from nuclear emulsion experiments [1,2], in which they were determined by analyzing the kinetic energies of products from weak pionic decays. Only recently, B Λ values of light hypernuclei could have been determined by electron scattering experiments using high-resolution magnetic spectrometers, e.g.…”

Section: Binding Energy Of Hypertritonmentioning

confidence: 99%

“…The total number of events was N = 204 and the mean value was evaluated in ref. [4] to be B Λ = 0.13 ± 0.05 MeV (statistical and total uncertainties including an estimate of the systematic error [1]). …”

Section: Binding Energy Of Hypertritonmentioning

confidence: 99%

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High-precision measurement of the hypertriton mass

Achenbach¹,

Bleser²,

Pochodzalla³

et al. 2018

Proceedings of XVII International Conference on Hadron Spectroscopy and Structure — PoS(Hadron2017)

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In recent years, the high-precision technique of decay-pion spectroscopy at the Mainz Microtron (MAMI), using high-resolution magnetic spectrometers, contributed to the accurate determination of the Λ binding energy of 4 Λ H. For the lightest hypernucleus, the hypertriton, the binding energy is known only from measurements carried out with nuclear emulsions. An account is given on the potential of observing the hypertriton with decay-pion spectroscopy from fragmentation of light target nuclei. Statistical decay calculations suggest that lithium is the optimal target material to observe hypertriton decays under relative clean conditions with only few other light hyperfragments being produced. Finally, a high-precision measurement of the hypertriton mass at MAMI is proposed.

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Section: Binding Energy Of Hypertritonmentioning

confidence: 99%

Section: Binding Energy Of Hypertritonmentioning

confidence: 99%

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High-precision measurement of the hypertriton mass

Achenbach¹,

Bleser²,

Pochodzalla³

et al. 2018

Proceedings of XVII International Conference on Hadron Spectroscopy and Structure — PoS(Hadron2017)

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“…In chapter 3, the constructed experimental setup and detector specifications will be described, together with the actual experimental conditions and the trigger setup. The most remarkable point of the present setup is the newly constructed HES and the Splitter Figure 1.10: A dependence of Λ single particle energy measured by emulsion experiments [27,32], (π + � K + ) reaction spectroscopic experiments [23,16,20,22] and the (e� e � K + ) spectroscopic experiments [33]. The dashed line represents a calculated binding energy by Woods-Saxon potentials with a depth of 28 MeV and a radius parameter r 0 = 1.128 + 0.439A �2/3 [34].…”

Section: The Goal Of the Present Thesismentioning

confidence: 99%

Investigation of high-precision Λ hypernuclear spectroscopy via the (e,e'K<sup>+</sup>) reaction

Kawama

2011

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The study of Λ hypernuclear structure is very interesting in point of the understanding of the interaction between Λ and nucleon (ΛN interaction) and its "strange" structure itself due to the containment of a Λ hyperon which has a strangeness as a new degree of freedom. In the several way to study the Λ hypernuclei, the (e� e � K + ) reaction spectroscopy is a powerful tool for the precise investigation of Λ hypernuclear structure.The purpose of the preset thesis is the establishment of the experimental design with the efficient data analysis method for the (e� e � K + ) hypernuclear spectroscopic experiment in the wide mass region (from A=7 to A=52). It is very challenging to perform the (e� e � K + ) spectroscopic experiment with such a heavy target, because of the huge electron background due to the bremsstrahlung process. In the experiment, it is required to obtain the necessary hypernuclear yield, suppressing the background event ratio. We achieved these requirements by newly constructing the high resolution electron spectrometer (HES) and splitter magnet (SPL) dedicated to the (e� e � K + ) spectroscopic experiment. The HES consists of two quadrupole magnets and a dipole magnets (Q-Q-D) with a momentum resolution of dp/p = 3 × 10 �4 at p = 0.84 GeV/c. It was used being vertically tilted by 6.5 degree so as to optimize signal to noise ratio and hypernuclear yield.The SPL is a dipole magnet. The experimental target was placed at the entrance of this magnet. The role of the SPL is to separate four kind of particles; scattered kaons, photons created by the bremsstrahlung, the post beam and scattered electrons. In addition, since the SPL is a part of the kaon and electron spectrometers. We designed the magnet shape carefully considering these points.The experiment was performed with 2.344 GeV/c electron beam from CEBAF at Jefferson Lab. The experimental setup consists of the HES, SPL and HKS (high momentum resolution kaon spectrometer). The HKS is also a Q-Q-D type spectrometer with the momentum resolution of dp/p = 2 × 10 �4 at p = 1.2 GeV/c. In the data analysis, the particle momentum calibration was the most important procedure. At the initial point, the particle momentum was obtained from the calculated magnetic field map of the spectrometer whose accuracy is an order of 10 �2 . The initial momentum was calibrated by two step, the the magnetic field map improvement and the calibration with known masses of Λ/Σ 0 which were observed by the CH 2 target data. As a result of the calibration, the momentum resolutions of HKS and HES were estimated as 4 × 10 �4 and 6 × 10 �4 , respectively. Though these values are the double of the designed value, it was achieved to obtain the Λ/Σ 0 peaks with the same order of the designed energy from the original calculated magnetic field.The cross section was calculated with the several estimated factors. The averaged p(γ * � K + )Λ cross section in the HKS acceptance, (0.90 < cos(θ CM K � ) < 1.0) was calculated as 227±12±26 [nb/sr], which is consistent within the error...

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“…The statistical uncertainty for the binding energies in light hypernuclei with the emulsion method ranged from a minimum of 20 keV for the most abundant hypernuclei 5 Λ He to more than 700 keV for 8 Λ He [2][3][4]. Systematic errors in the emulsion data are not shown, but D.H. Davis assumed errors of the order of 50 keV [5].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations of the hypernucleus_Λ⁴H

Achenbach

Schulz

Aulenbacher

et al. 2016

EPJ Web of Conferences

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Abstract. Negatively charged pions from two-body decays of stopped 4 Λ H hypernuclei were studied in 2012 at the Mainz Microtron MAMI, Germany. The momenta of the decay-pions were measured with unprecedented precision by using high-resolution magnetic spectrometers. A challenge of the experiment was the tagging of kaons from associated K + Λ production off a Be target at very forward angles. In the year 2014, this experiment was continued with a better control of the systematic uncertainties, with better suppression of coincident and random background, improved particle identification, and with higher luminosities. Another key point of the progress was the improvement in the absolute momentum calibration of the magnetic spectrometers.

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Hypernuclei-the early days

Cited by 39 publications

References 42 publications

High-precision measurement of the hypertriton mass

High-precision measurement of the hypertriton mass

Investigation of high-precision Λ hypernuclear spectroscopy via the (e,e'K<sup>+</sup>) reaction

Experimental investigations of the hypernucleus_Λ⁴H

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Hypernuclei-the early days

Cited by 39 publications

References 42 publications

High-precision measurement of the hypertriton mass

High-precision measurement of the hypertriton mass

Investigation of high-precision Λ hypernuclear spectroscopy via the (e,e'K<sup>+</sup>) reaction

Experimental investigations of the hypernucleusΛ4H

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Experimental investigations of the hypernucleus_Λ⁴H