Properties of the 7He ground state from 8He neutron knockout
Journal article, 2009

The unbound nucleus 7He, produced in neutron-knockout reactions with a 240 MeV/u 8He beam in a liquid-hydrogen target, has been studied in an experiment at the ALADIN-LAND setup at GSI. From an R-matrix analysis the resonance parameters for 7He as well as the spectroscopic factor for the 6He(0+) + n configuration in its ground-state have been obtained. The spectroscopic factor is 0.61 confirming that 7He is not a pure single-particle state. An analysis of 5He data from neutron-knockout reactions of 6He in a carbon target reveals the presence of an s-wave component at low energies in the α+n relative energy spectrum. A possible low-lying exited state in 7He observed in neutron knockout data from 8He in a carbon target and tentatively interpreted as a Iπ=1/2− state, could not be observed in the present experiment. Possible explanations of the shape difference between the 7He resonance obtained in the two knockout reactions are discussed in terms of target-dependence or different reaction mechanisms at relativistic energies.

Author

Yuliya Aksyutina

Chalmers, Applied Physics, Subatomic Physics

Håkan T Johansson

Chalmers, Applied Physics, Subatomic Physics

T. Aumann

K. Boretzky

M. J. G. Borge

A. Chatillon

L.V. Chulkov

D. Cortina-Gil

U. Datta Pramanik

H. Emling

Christian Forssen

Chalmers, Applied Physics, Subatomic Physics

H. O. U. Fynbo

H. Geissel

G. Ickert

Björn Jonson

Chalmers, Applied Physics, Subatomic Physics

R. Kulessa

C. Langer

Mattias Lantz

Chalmers, Applied Physics, Subatomic Physics

T. LeBleis

Anton Lindahl

University of Gothenburg

K. Mahata

Mikael Meister

Chalmers, Applied Physics, Subatomic Physics

G. Münzenberg

Thomas Nilsson

Chalmers, Applied Physics, Subatomic Physics

Göran Hugo Nyman

Chalmers, Applied Physics, Subatomic Physics

R. Palit

S. Paschalis

W. Prokopowicz

R. Reifarth

A. Richter

K. Riisager

G. Schrieder

H. Simon

K. Sümmerer

Olof Tengblad

H. Weick

Mikhail Zhukov

Chalmers, Applied Physics, Subatomic Physics

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

0370-2693 (ISSN)

Vol. 679 3 191 - 196

Subject Categories

Subatomic Physics

Roots

Basic sciences

DOI

10.1016/j.physletb.2009.07.044

More information

Created

10/7/2017