Halo structure of $^8$B determined from intermediate energy proton elastic scattering in inverse kinematics

G. A. Korolev; A. V. Dobrovolsky; A. G. Inglessi; G. D. Alkhazov; P. Egelhof; A. Estrade; I. Dillmann; F. Farinon; H. Geissel; S. Ilieva; Y. Ke; A. V. Khanzadeev; O. A. Kiselev; J. Kurcewicz; X. C. Le; Yu. A. Litvinov; G. E. Petrov; A. Prochazka; C. Scheidenberger; L. O. Sergeev; H. Simon; M. Takechi; S. Tang; V. Volkov; A. A. Vorobyov; H. Weick; V. I. Yatsoura

doi:10.1016/j.physletb.2018.03.013

Home/Archive/arXiv

arXiv · 1803.02044

Halo structure of $^8$B determined from intermediate energy proton elastic scattering in inverse kinematics

View original source ↗Read source document ↗Export metadata ↓

Abstract

The absolute differential cross section for small-angle proton elastic scattering on the proton-rich $^8$B nucleus has been measured in inverse kinematics for the first time. The experiment was performed using a secondary radioactive beam with an energy of 0.7 GeV/u at GSI, Darmstadt. The active target, namely hydrogen-filled time projection ionization chamber IKAR, was used to measure the energy, angle and vertex point of the recoil protons. The scattering angle of the projectiles was simultaneously determined by the tracking detectors. The measured differential cross section is analyzed on the basis of the Glauber multiple scattering theory using phenomenological nuclear-density distributions with two free parameters. The radial density distribution deduced for $^8$B exhibits a halo structure with the root-mean-square (rms) matter radius $R_{\rm m} = 2.58 (6)$ fm and the rms halo radius $R_{\rm h} = 4.24 (25)$ fm. The results on $^8$B are compared to those on the mirror nucleus $^8$Li investigated earlier by the same method. A comparison is also made with previous experimental results and theoretical predictions for both nuclei.

Explore related subjects

nucl-ex nucl-th

Keep this discovery

BibTeX RIS

G. A. Korolev, A. V. Dobrovolsky, A. G. Inglessi, G. D. Alkhazov, P. Egelhof, A. Estrade, I. Dillmann, F. Farinon, H. Geissel, S. Ilieva, Y. Ke, A. V. Khanzadeev, O. A. Kiselev, J. Kurcewicz, X. C. Le, Yu. A. Litvinov, G. E. Petrov, A. Prochazka, C. Scheidenberger, L. O. Sergeev, H. Simon, M. Takechi, S. Tang, V. Volkov, A. A. Vorobyov, H. Weick, V. I. Yatsoura. 2018-03-06. Halo structure of $^8$B determined from intermediate energy proton elastic scattering in inverse kinematics. https://doi.org/10.1016/j.physletb.2018.03.013

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Reinvestigation of the Yield of the Trinity Device

Previous published analyses of trinitite to determine the yield of the Trinity nuclear explosion used various estimates of the fraction of fission products that became incorporated in trinitite. Furthermore, these studies utilized nuclear data that has subsequently been revised. Utilizing a planar germanium detector, we observed gamma rays produced by the decays of both 137Cs and 239Pu from four samples of trinitite. From the observed 137Cs/239Pu ratios of and a simple analysis method based on current nuclear data and weapons debris studies, we find an average yield of 9.1+-4.5 kilotons from our four samples. While this result is substantially lower than the established total yield of 21 kilotons, it is in reasonable agreement that attributable to fissions in the 239Pu core alone.

nucl-ex↗

arXiv2026

Search for neutrinoless quadruple beta decay of $^{136}$Xe in PandaX-4T detector

The observation of neutrinoless quadruple beta decay (0$\nu$4$\beta$) in the absence of neutrinoless double beta decay (0$\nu$2$\beta$) has been argued to provide a strong indication that neutrinos are Dirac particles. We report a search for 0$\nu$4$\beta$ decay of $^{136}\text{Xe}$ using a total $^{136}\text{Xe}$ exposure of 148.4 kg$\cdot$yr, collected during the commissioning and the first science runs of the PandaX-4T experiment. No significant excess of events over the background is observed. A lower limit on the 0$\nu$4$\beta$ decay half-life of $^{136}\text{Xe}$ is set at 6.01 x $10^{24}$ yr at the 90% confidence level. This result establishes the most stringent constraint on this process in xenon, demonstrating the unique capability of the PandaX-4T detector in probing lepton number violation and shedding light on the fundamental nature of neutrinos.

nucl-ex↗

arXiv2026

Island of Inversion in neutron-rich cobalt isotopes revealed from mass measurements

Mass measurements of the ground and isomeric states of $^{68-70}$Co have been performed using the JYFLTRAP Penning-trap mass spectrometer at the IGISOL facility. The masses were measured, either for the first time for the isomeric states of $^{68}$Co and $^{70}$Co, or with greatly improved precision for the others, removing ambiguities in the mass surface beyond $N=40$. The ordering of the low and high-spin states in $^{68}$Co and $^{70}$Co has also been established. The results, supported by Large-Scale Shell Model and Discrete Non-Orthogonal Shell-Model calculations, show a gradual lowering of intruder states with increasing neutron number, eventually leading to an inversion in $^{70}$Co. These findings clarify previously proposed contradictory interpretations. Finally, we demonstrate the importance of including induced effective 3N forces for a consistent description of binding energies in the island of inversion near $N=40$.

nucl-ex↗