S. Yokoyama | Researchain

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Featured researches published by S. Yokoyama.

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1994

Efficiency of a BaF2 scintillator detector for 15–150 MeV neutrons

R. A. Kryger; A. Azhari; E. Ramakrishnan; M. Thoennessen; S. Yokoyama

Abstract The neutron detection efficiency of a BaF 2 scintillator detector was measured relative to a NE213 detector for neutron energies between 15 and 150 MeV. The efficiency for the BaF 2 detector is found to be higher than a comparable NE213 detector for neutrons above 70 MeV.

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 1995

Studies of light nuclei beyond the particle driplines: the two-proton emitter 12O

R. A. Kryger; A. Azhari; M. Hellström; J. H. Kelley; T. Kubo; R. Pfaff; E. Ramakrishnan; B. M. Sherrill; M. Thoennessen; S. Yokoyama; R. J. Charity; A. Kirov; N. Robertson; D. G. Sarantites; L. G. Sobotka; J.A. Winger

Abstract The decay dynamics of the ground state two proton emitter 12O, which lies beyond the proton dripline, were investigated following the population of 12O via single-neutron stripping of an 13O projectile. The decay products, two protons and 10C, were detected in coincidence and correlations among these particles were studied. No evidence was seen for 2He emission in the decay. This appears consistent with direct breakup or possibly sequential decay through 11N.

Physical Review C | 1999

Population of 10 Li by fragmentation

M. Thoennessen; S. Yokoyama; A. Azhari; T. Baumann; J. A. Brown; A. Galonsky; P. G. Hansen; J. H. Kelley; R. A. Kryger; E. Ramakrishnan; P. Thirolf

Physical Review Letters | 1996

Giant Dipole Resonance Built on Highly Excited States of Sn-120 Nuclei Populated by Inelastic alpha Scattering

E. Ramakrishnan; T. Baumann; A. Azhari; R. A. Kryger; R. Pfaff; M. Thoennessen; S. Yokoyama; J.R. Beene; M. L. Halbert; P. E. Mueller; D. W. Stracener; R. L. Varner; R. J. Charity; D. G. Sarantites; L. G. Sobotka

Physical Review C | 1999

Population of Li-10 by fragmentation

M. Thoennessen; P. G. Thirolf; Easwar Ramakrishnan; R. A. Kryger; J. H. Kelley; A. Galonsky; P. G. Hansen; J. Brown; T. Baumann; S. Yokoyama; A. Azhari

Physical Review C | 2000

First evidence for low lying s -wave strength in 13 Be

M. Thoennessen; S. Yokoyama; P. G. Hansen

Physical Review C | 1998

Proton decay of states in {sup 11}N

A. Azhari; T. Baumann; J. A. Brown; M. Hellström; J. H. Kelley; R. A. Kryger; D. J. Millener; H. Madani; E. Ramakrishnan; D. E. Russ; T. Suomijärvi; M. Thoennessen; S. Yokoyama

Physical Review C | 1999

Population of 10Li by fragmentation

M. Thoennessen; S. Yokoyama; A. Azhari; T. Baumann; J. Brown; A. Galonsky; P. G. Hansen; J. H. Kelley; R. A. Kryger; Easwar Ramakrishnan; P. G. Thirolf

Physical Review C | 1993

Neutron decay of 10Li produced by fragmentation.

R. A. Kryger; A. Azhari; A. Galonsky; J. H. Kelley; R. Pfaff; E. Ramakrishnan; D. Sackett; B. M. Sherrill; M. Thoennessen; J. A. Winger; S. Yokoyama

Archive | 1996

Photon Decay Following the Projectile Excitation of ^11Be

Ning Gan; James R. Beene; M. L. Halbert; D. W. Stracener; Robert L. Varner; A. Azhari; Easwar Ramakrishnan; P. G. Thirolf; M. Thoennessen; S. Yokoyama

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