Ground-state configuration of neutron-rich Al-35 via Coulomb breakup
Journal article, 2017

The ground-state configuration of Al-35 has been studied via Coulomb dissociation (CD) using the LAND-FRS setup (GSI, Darmstadt) at a relativistic energy of similar to 403 MeV/nucleon. The measured inclusive differential CD cross section for Al-35, integrated up to 5.0 MeV relative energy between the Al-34 core and the neutron using a Pb target, is 78(13) mb. The exclusive measured CD cross section that populates various excited states of 34Al is 29(7) mb. The differential CD cross section of Al-35 -> Al-34 + n has been interpreted in the light of a direct breakup model, and it suggests that the possible ground-state spin and parity of Al-35 could be, tentatively, 1/2+ or 3/2(+) or 5/2(+). The valence neutrons, in the ground state of Al-35, may occupy a combination of either l = 3,0 or l = 1,2 orbitals coupled with the Al-34 core in the ground and isomeric state(s), respectively. This hints of a particle-hole configuration of the neutron across the magic shell gaps at N = 20,28 which suggests narrowing the magic shell gap. If the 5/2+ is the ground-state spin-parity of Al-35 as suggested in the literature, then the major ground-state configuration of Al-35 is a combination of Al-34(g. s.; 4(-)) circle times upsilon(p3/2) and Al-34(isomer; 1(+)) circle times upsilon(d3/2) states. The result from this experiment has been compared with that from a previous knockout measurement and a calculation using the SDPF-M interaction.

Collisions

Island

N=20 Shell Closure

Mass Measurements

Ions

Nuclei

Emission

Excitation

Isotopes

Inversion

Author

S. Chakraborty

U. Datta

T. Aumann

S. Beceiro-Novo

K. Boretzky

C. Caesar

B. V. Carlson

W. N. Catford

M. Chartier

D. Cortina-Gil

G. de Angelis

Paloma Diaz Fernandez

Chalmers, Physics, Subatomic and Plasma Physics

H. Emling

O. Ershova

L. M. Fraile

H. Geissel

D. Gonzalez-Diaz

Håkan T Johansson

Chalmers, Physics, Subatomic and Plasma Physics

Björn Jonson

Chalmers, Physics, Subatomic and Plasma Physics

N. Kalantar-Nayestanaki

T. Kroll

R. Kruecken

C. Langer

T. Le Bleis

Y. Leifels

J. Marganiec

G. Munzenberg

M. A. Najafi

Thomas Nilsson

Chalmers, Physics, Subatomic and Plasma Physics

C. Nociforo

V. Panin

R. Plag

A. Rahaman

R. Reifarth

M. V. Ricciardi

C. Rigollet

D. Rossi

C. Scheidenberger

H. Scheit

H. Simon

J. T. Taylor

Y. Togano

S. Typel

Y. Utsuno

A. Wagner

F. Wamers

H. Weick

J. S. Winfield

Physical Review C

2469-9985 (ISSN)

Vol. 96 3 1965-

Subject Categories

Physical Sciences

DOI

10.1103/PhysRevC.96.034301

More information

Latest update

3/8/2018 1