Direct experimental evidence for a multiparticle-hole ground state configuration of deformed Mg-33
Artikel i vetenskaplig tidskrift, 2016

The first direct experimental evidence of a multiparticle-hole ground state configuration of the neutron-rich Mg-33 isotope has been obtained via intermediate energy (400 A MeV) Coulomb dissociation measurement. The major part similar to(70 +/- 13)% of the cross section is observed to populate the excited states of Mg-32 after the Coulomb breakup of Mg-33. The shapes of the differential Coulomb dissociation cross sections in coincidence with different core excited states favor that the valence neutron occupies both the s(1/2) and p(3/2) orbitals. These experimental findings suggest a significant reduction and merging of sd-pf shell gaps at N similar to 20 and 28. The ground state configuration of Mg-33 is predominantly a combination of Mg-32(3.0,3.5MeV; 2(-), 1(-)) circle times nu(s1/2), Mg-32(2.5MeV; 2(+)) circle times nu(p3/2), and Mg-32(0; 0(+)) circle times nu(p3/2). The experimentally obtained quantitative spectroscopic information for the valence neutron occupation of the s and p orbitals, coupled with different core states, is in agreement with Monte Carlo shell model (MCSM) calculation using 3 MeV as the shell gap at N = 20.

collisions

neutron-rich isotopes

coulomb breakup

island

inversion

deformation

nuclei

halos

relativistic heavy-ions

Författare

U. Datta

A. Rahaman

T. Aumann

S. Beceiro-Novo

K. Boretzky

C. Caesar

B. V. Carlson

W. N. Catford

S. Chakraborty

M. Chartier

D. Cortina-Gil

G. de Angelis

Paloma Diaz Fernandez

H. Emling

O. Ershova

L. M. Fraile

H. Geissel

D. Gonzalez-Diaz

Björn Jonson

Chalmers, Fysik, Subatomär fysik och plasmafysik

Håkan T Johansson

Chalmers, Fysik, Subatomär fysik och plasmafysik

N. Kalantar-Nayestanaki

T. Kroll

R. Krucken

J. Kurcewicz

C. Langer

T. Le Bleis

Y. Leifels

J. Marganiec

G. Munzenberg

M. A. Najafi

Thomas Nilsson

Chalmers, Fysik, Subatomär fysik och plasmafysik

C. Nociforo

V. Panin

S. Paschalis

R. Plag

R. Reifarth

V. Ricciardi

D. Rossi

H. Scheit

C. Scheidenberger

H. Simon

J. T. Taylor

Y. Togano

S. Typel

V. Volkov

A. Wagner

F. Wamers

H. Weick

M. Weigand

J. S. Winfield

D. Yakorev

M. Zoric

Physical Review C

2469-9985 (ISSN)

Vol. 94

Ämneskategorier

Subatomär fysik

Fysik

Fundament

Grundläggande vetenskaper

DOI

10.1103/PhysRevC.94.034304