Conveners
3; Wed-IVb
- Nir Barnea
We are aiming for measurement of X rays form $\Xi^-$ atom to obtain the information on $\Xi$A interaction.
In 2021, We performed $\Xi^-$-Fe atomic X-ray spectroscopy experiment (J-PARC E03) at J-PARC K1.8 beam line. $\Xi^-$ hyperons were produced via the (K$^-$, K$^+$) reaction. Beam K$^-$ and scatterd K$^+$ were measured by magnetic spectrometers and X rays from $\Xi^-$-Fe atom werw...
The $\Lambda$ binding energy difference, which is called the charge symmetry breaking in the ground states of a pair of A = 4 hypernuclei, \hl and \hel, was measured to be $\Delta B_{\Lambda}^4(0_{g.s.}^{+})\approx 350~$keV in nuclear emulsion experiments in 1970s. In the 2015 experiment from J-PARC, the binding energy difference in excited states $\Delta B_{\Lambda}^4(1_{exc}^{+})\approx...
The field of strangeness physics is still post seven decades from its birth holds the exclusive characteristic of having more conjectures than answers in both theoretical and experimental dimensions. One of the major among the open question is the knowledge about background effect on various hyperon-baryon channels playing crucial role from heavy-ion collisions to celestial objects to name a...
The E12-17-003 Experiment was carried out successfully at Jefferson lab in 2018 using a pressurized tritium target. By utilizing the Hall A high-resolution spectrometers and the $^{3}H(e,e’K^{+})Λnn$ reaction, enhancements which may correspond to the possible $Λnn$ resonance and a pair of $ΣNN$ sate were observed with an energy resolution of 1.21 MeV (σ), although the greater statistics are...
A recent JLab experiment exploiting the $^3$H(e,e'K$^+$)$^3_\Lambda$n reaction to investigate the existence of a threshold $^3_\Lambda$n resonance that would place constraints on the $\Lambda$n scattering length, observed a structure in the spectrum that was interpreted to be a $\Sigma$NN resonance [1,2]. Such a $\Sigma$NN resonance could have isospin T=0 or T=1. Garcilazo argued in 1987 on...
We report on our recent result [1] concerning in-medium $\Lambda$ isospin impurity derived from charge symmetry breking (CSB) in the mirror hypernuclei ${\rm ^4_\Lambda H}-{\rm ^4_\Lambda He}$. Using pionless effective field theory and partially conserved baryon-baryon SU(3) flavor symmetry we find that the in-medium admixture amplitude ${\cal A}_{I=1}$ in the dominantly isospin $I=0$...
The measurement of the production and the lifetime of the hypertriton with the ALICE detector at the LHC is presented to address some of the key open questions of hypernuclear and particle physics.
The hypertriton is a bound state of a proton (p), a neutron (n) and a Λ and it is characterized by a very low binding energy and a large wave function. It is still unclear how such a fragile...
To understand the mechanism of the sizable charge symmetry breaking between $^4_\Lambda$H and $^4_\Lambda$He, we plan to measure the gamma-transition energy of $^4_\Lambda$H ($1^+→0^+$) with a high-resolution Germanium detector array (Hyperball-J) at J-PARC (E63 experiment). The $^4_\Lambda$H is efficiently produced as hyperfragments from the in-flight $^7$Li $(K^-,\pi^-)$ reaction....
