smain sekal
(TENNESSEE TECH UNIVERSITY for GRIFFIN Collaboration)
The $\beta^-$ decay of $^{34}$Mg has been exploited to probe the nuclear structure of $^{34}$Al at the boundary of the $N=20$ Island of Inversion, using high-efficiency $\gamma$ spectroscopy at the GRIFFIN spectrometer (TRIUMF–ISAC). Absolute $\beta$-feeding intensities and corresponding $\log ft$ values were extracted, and $\gamma$--$\gamma$ angular-correlation measurements were performed to constrain the spin assignments of several low-lying states. The decay pattern is characterized by a pronounced population of the isomeric $1^+$ state in $^{34}$Al, consistent with strong Gamow–Teller transitions from the $0^+$ ground state of $^{34}$Mg. The observed selective feeding of the lowest $1^+$ states, combined with reduced population of higher-lying excitations, indicates a fragmented distribution of Gamow–Teller strength. This decay selectivity suggests that the $^{34}$Mg ground state contains a substantial admixture of normal $0p0h$ configurations together with intruder components. The persistence of the observed GT-strength pattern when including two-body axial-current contributions further supports a strongly mixed configuration at the edge of the Island of Inversion. Large-scale configuration-interaction calculations with the FSU interaction, complemented by \textit{ab initio} approaches, reproduce the measured decay properties and confirm significant cross-shell mixing in this mass region.
| Contribution category |
Experiment
|
| Presenter status |
Postdoc
|
smain sekal
(TENNESSEE TECH UNIVERSITY for GRIFFIN Collaboration)
A. Kindred
(TENNESSEE TECH UNIVERSITY for GRIFFIN Collaboration)
A. Volya
(for GRIFFIN Collaboration)
A.B. Garnsworthy
(for GRIFFIN Collaboration)
A.T. Laffoley
(for GRIFFIN Collaboration)
B. Olaizola
(for GRIFFIN Collaboration)
C. Paxman
(for GRIFFIN Collaboration)
C. Porzio
(for GRIFFIN Collaboration)
C.E. Svensson
(for GRIFFIN Collaboration)
C.J. Griffin
(for GRIFFIN Collaboration)
C.R. Natzke
(for GRIFFIN Collaboration)
D. Moye
(TENNESSEE TECH UNIVERSITY for GRIFFIN Collaboration)
E. Gopaul
(for GRIFFIN Collaboration)
E. Hackman
(for GRIFFIN Collaboration)
E. Vespie
(for GRIFFIN Collaboration)
F.H. Garcia
(for GRIFFIN Collaboration)
G. Carpenter
(for GRIFFIN Collaboration)
G.C. Ball
(for GRIFFIN Collaboration)
I. Dillmann
(for GRIFFIN Collaboration)
J. McAfee
(for GRIFFIN Collaboration)
J. Williams
(for GRIFFIN Collaboration)
K. Whitmore
(for GRIFFIN Collaboration)
M. Rocchini
(for GRIFFIN Collaboration)
Prof.
Mustapha Rajabali
(TENNESSEE TECH UNIVERSITY)
R. Kanungo
(for GRIFFIN Collaboration)
R. Preshong
(for GRIFFIN Collaboration)
R.S. Lubna
(for GRIFFIN Collaboration)
S. Gillespie
(for GRIFFIN Collaboration)
S. Nittala
(for GRIFFIN Collaboration)
S.S. Bhattacharjee
(for GRIFFIN Collaboration)
T. Zidar
(for GRIFFIN Collaboration)
V. Bildstein
(for GRIFFIN Collaboration)
V. Vedia
(for GRIFFIN Collaboration)
Y. Hassan
(TENNESSEE TECH UNIVERSITY for GRIFFIN Collaboration)
Y. Saito
(for GRIFFIN Collaboration)
There are no materials yet.
