Ground-state binding energy of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow><mml:mi mathvariant="normal">Λ</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:mmultiscripts></mml:math> from high-resolution decay-pion spectroscopy

Schulz, Florian; Achenbach, P.; Aulenbacher, S.; Beričič, J.; Bleser, S.; Böhm, R.; Bosnar, D.; Correa, L.; Distler, M. O.; Esser, A.; Fonvieille, H.; Friščić, I.; Fujii, Y.; Fujita, Masaya; Gogami, T.; Kanda, H.; Kaneta, M.; Kegel, S.; Kohl, Y.; Kusaka, W.; Margaryan, A.; Merkel, H.; Mihovilovič, M.; Müller, U.; Nagao, Shijo; Nakamura, S. N.; Pochodzalla, J.; Lorente, A. Sánchez; Schlimme, B. S.; Schoth, M.; Sfienti, C.; Širca, S.; Steinen, Marcell; Takahashi, Y.; Tang, L.; Thiel, M.; Tsukada, K.; Tyukin, A.; Weber, A.

doi:10.1016/j.nuclphysa.2016.03.015

Cited by 52 publications

(57 citation statements)

References 19 publications

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“…The technique used by the A1 Collaboration was to measure the binding energy of light hypernuclei produced in a multi-step strangeness production, nuclear fragmentation and pionic weak decay reaction chain following the (e, e K + ) reaction on a 9 Be target. In 2014, an extended measurement campaign was performed with improved control over systematic effects and confirming the measurement with two spectrometers at the same time [10]. The Λ binding energy resolution was designed to be δ B ≤ 100 keV, the highest resolution in hypernuclear spectroscopy using magnetic spectrometers.…”

Section: Binding Energy Of Hypertritonmentioning

confidence: 99%

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%

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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“…Photograph of the experimental setup in the spectrometer hall for the hypernuclear fragmentation experiment of the year 2012. The electron beam (coming from top) was steered through a beam transport line magnetic chicane and was incident on the 9 Be target with an angle of 17…”

Section: High-resolution Decay-pion Spectroscopy Of Hyperfragmentsmentioning

confidence: 99%

“…A 9 Be foil with a thickness of 125 µm tilted by 54 • served as the production target. Kaons from the electroproduction reaction 9 Be(e, K + ) that can can tag the strangeness production were identified by their time-of-flight and specific energy loss in the three scintillator walls and minimum signals in the two aerogelČerenkov detectors.…”

Section: High-resolution Decay-pion Spectroscopy Of Hyperfragmentsmentioning

confidence: 99%

High-Resolution Decay-Pion Spectroscopy of \({}_{\Lambda }^{4}\text{H}\) Hypernuclei

Achenbach

Schulz

Nagao

et al. 2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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The first observation of 4 Λ H fragments by means of decay-pion spectroscopy with a high resolution magnetic spectrometer was achieved in 2012 at the Mainz Microtron MAMI. The extracted Λ binding energy was consistent with older nuclear emulsion data, but almost one order of magnitude higher in precision, while being limited by systematic uncertainties. This paper gives details on the kaon tagging at 0• forward angle which was indispensable for the success of the experiment. In addition, a re-analysis of the data collected in 2012 is presented, including an improved a posteriori spectrometer calibration and a more robust fitting of the decay-pion peak in the momentum spectrum.

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“…Diagram (b) includes the 4 Λ He transition energy re-measured recently at J-PARC [17], falsifying the earlier values. Finally, diagram (c) uses the 4 Λ H ground state binding energy recently re-measured at MAMI [18]. earlier results from low-resolution, low-efficiency NaI detector measurements in the 1970s [14].…”

Section: M(mentioning

confidence: 99%

“…± 0.077 (syst.) MeV has been published [18] including a detailed error and bias analysis. This binding energy can be used together with the 4 Λ He ground state binding energy from nuclear emulsion experiments and with energy levels of the 1 + excited state for both hypernuclei from γ-ray spectroscopy to arrive at the latest level diagrams and CSB splittings of the 4 Λ H and 4 Λ He mirror hypernuclei.…”

Section: M(mentioning

confidence: 99%

Charge symmetry breaking inA= 4 hypernuclei

Achenbach

2016

EPJ Web Conf.

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Abstract. Charge symmetry breaking in the A = 4 hypernuclear system is reviewed. The data on binding energies of the mirror nuclei and hypernuclei are examined. At the Mainz Microtron MAMI the high-resolution spectroscopy of decay-pions in strangeness electro-production is used to extract the Λ hyperon ground state binding energy in 4 Λ H. This binding energy is used together with the 4 Λ He ground state binding energy from nuclear emulsion experiments and with energy levels of the 1 + excited state for both hypernuclei from γ-ray spectroscopy to address the charge symmetry breaking in the strong interaction. The binding energy difference of the ground states in the mirror pair is reduced from its long accepted value ΔB 4 Charge symmetry and charge independence breakingThe nuclear interactions have a small charge-dependent component breaking the near symmetry between protons and neutrons in their interactions and their contributions to nuclear properties. However, the concept of charge symmetry is quite useful in describing many facets of nuclear physics, e.g. the observation of nearly identical levels and spin-parity assignments of excited nuclear states in mirror nuclei. The fundamental cause of the charge dependence of nuclear forces, i.e. charge-symmetry breaking (CSB) and charge-independence breaking (CIB), is due to the differences in the up and down quark masses and due to electromagnetic effects.A very important consequence of CSB is the fact that neutrons are heavier than protons (by only approximately ΔM/M ∼ 0.1 %) despite the larger electrostatic repulsion of the quarks inside the proton that would make the proton heavier. The decay of free neutrons (allowed by their larger mass) during the primordial nucleosynthesis left a large fraction of protons unbound, now existing mainly in the stars and providing a slow-burning fuel for the universe. The very reverse, protons being heavier than neutrons, would be a disaster for life as we know it.

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Ground-state binding energy of HΛ4 from high-resolution decay-pion spectroscopy

Abstract: A systematic study on the Λ ground state binding energy of hyperhydrogen 4 Λ H measured at the Mainz Microtron MAMI is presented. The energy was deduced from the spectroscopy of mono-energetic pions from the two-body decays

Cited by 52 publications

References 19 publications

High-precision measurement of the hypertriton mass

High-precision measurement of the hypertriton mass

High-Resolution Decay-Pion Spectroscopy of \({}_{\Lambda }^{4}\text{H}\) Hypernuclei

Charge symmetry breaking inA= 4 hypernuclei

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