One-neutron removal measurement reveals 24O as a new doubly magic nucleus.

Authors :: Kanungo R
Nociforo C
Prochazka A
Aumann T
Boutin D
Cortina-Gil D
Davids B
Diakaki M
Farinon F
Geissel H
Gernhäuser R
Gerl J
Janik R
Jonson B
Kindler B
Knöbel R
Krücken R
Lantz M
Lenske H
Litvinov Y
Lommel B
Mahata K
Maierbeck P
Musumarra A
Nilsson T
Otsuka T
Perro C
Scheidenberger C
Sitar B
Strmen P
Sun B
Szarka I
Tanihata I
Utsuno Y
Weick H
Winkler M
Source :: Physical review letters [Phys Rev Lett] 2009 Apr 17; Vol. 102 (15), pp. 152501. Date of Electronic Publication: 2009 Apr 13.
Publication Year :: 2009
Abstract: The first measurement of the momentum distribution for one-neutron removal from (24)O at 920A MeV performed at GSI, Darmstadt is reported. The observed distribution has a width (FWHM) of 99 +/- 4 MeV/c in the projectile rest frame and a one-neutron removal cross section of 63 +/- 7 mb. The results are well explained with a nearly pure 2s&#95;{1/2} neutron spectroscopic factor of 1.74 +/- 0.19 within the eikonal model. This large s-wave probability shows a spherical shell closure thereby confirming earlier suggestions that (24)O is a new doubly magic nucleus.