Dissociation of [Formula Presented]

Y. Iwata, K. Ieki, A. Galonsky, J. J. Kruse, J. Wang, R. H. White-Stevens, E. Tryggestad, P. D. Zecher, F. Deák, Horváth, Kiss, Z. Seres, J. J. Kolata, J. von Schwarzenberg, R. E. Warner, H. Schelin

Research output: Article

Abstract

We have performed kinematically complete measurements of dissociation of [Formula Presented] into [Formula Presented] and two neutrons at [Formula Presented] MeV. The targets were Sn and Pb. A prominent peak around 0.4 MeV in the relative energy distribution of the [Formula Presented] system is consistent with the ground state of [Formula Presented] suggesting sequential decay via [Formula Presented] in [Formula Presented] dissociation. Further evidence of the sequential decay was found in neutron momentum distributions. The excitation energy distributions of [Formula Presented] were reconstructed. For the Sn target, it shows a peak which is suggestive of the first excited state of [Formula Presented] MeV, [Formula Presented] MeV, and [Formula Presented] The distribution for the Pb target was found to have a broad structure, indicating the [Formula Presented] continuum, as observed in measurements of other halo nuclei. The photonuclear cross section [Formula Presented] and the dipole strength function [Formula Presented] were deduced for the first time. The integrated dipole strength up to 3 MeV decay energy is [Formula Presented] Insignificant energy-weighted strength, compared to the cluster sum rule, indicates that [Formula Presented] does not have the [Formula Presented] structure. Agreement of the measured neutron momentum distributions with the COSMA model is in favor of the [Formula Presented] structure.

Original languageEnglish
Number of pages1
JournalPhysical Review C - Nuclear Physics
Volume62
Issue number6
DOIs
Publication statusPublished - jan. 1 2000

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Iwata, Y., Ieki, K., Galonsky, A., Kruse, J. J., Wang, J., White-Stevens, R. H., Tryggestad, E., Zecher, P. D., Deák, F., Horváth, Kiss, Seres, Z., Kolata, J. J., von Schwarzenberg, J., Warner, R. E., & Schelin, H. (2000). Dissociation of [Formula Presented]. Physical Review C - Nuclear Physics, 62(6). https://doi.org/10.1103/PhysRevC.62.064311