Properties of the 7He ground state from 8He neutron knockout
Artikel i vetenskaplig tidskrift, 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.

Författare

Yuliya Aksyutina

Chalmers, Teknisk fysik, Subatomär fysik

Håkan T Johansson

Chalmers, Teknisk fysik, Subatomär fysik

T. Aumann

K. Boretzky

M. J. G. Borge

A. Chatillon

L.V. Chulkov

D. Cortina-Gil

U. Datta Pramanik

H. Emling

Christian Forssen

Chalmers, Teknisk fysik, Subatomär fysik

H. O. U. Fynbo

H. Geissel

G. Ickert

Björn Jonson

Chalmers, Teknisk fysik, Subatomär fysik

R. Kulessa

C. Langer

Mattias Lantz

Chalmers, Teknisk fysik, Subatomär fysik

T. LeBleis

Anton Lindahl

Göteborgs universitet

K. Mahata

Mikael Meister

Chalmers, Teknisk fysik, Subatomär fysik

G. Münzenberg

Thomas Nilsson

Chalmers, Teknisk fysik, Subatomär fysik

Göran Hugo Nyman

Chalmers, Teknisk fysik, Subatomär fysik

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, Teknisk fysik, Subatomär fysik

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

0370-2693 (ISSN)

Vol. 679 3 191 - 196

Ämneskategorier

Subatomär fysik

Fundament

Grundläggande vetenskaper

DOI

10.1016/j.physletb.2009.07.044

Mer information

Skapat

2017-10-07