Speaker
Masaki Sasano
(RIKEN Nishina Center for Accelerator-Based Science)
Description
Electron-capture (EC) and beta-decay play important roles in type-II and typeIa supernovae. They occur through the Gamow-Teller (GT) and Fermi transitions in nuclei, which are extensively studied to reliably estimate the weak-interactions rates. Experimentally, a powerful probe to study GT transitions has been provided by the charge-exchange reactions at intermediate energies such as the (p,n), (3He,t) rections. They can selectively excite the GT transitions in a wide excitation energy region. Until recently, such studies have been restricted to stable nuclei because of difficulties in inverse-kinematics measurements with rare isotope beams. In this talk, we present the first study with a rare isotope using the 56Ni(p,n)56Cu reaction at 110 MeV/u in inverse kinematics with a newly developed Low-Energy Neutron Detector Array (LENDA) in combination with the S800 spectrometer. 56Ni is produced in large abundances during the pre-explosion phase of core-collapse supernovae and considered to be as one of the most important contributors to the change in the electron-to-baryon ratio in core-collapse supernovae. In addition, to study the GT transition in 56Ni serves as a stringent test of the effects of the N=Z=28 core not being inert on GT transitions for a large number of nearby nuclei in the Fe region.
Primary authors
G. Perdikakis
(National Superconducting Cyclotron Laboratory, MSU)
Masaki Sasano
(RIKEN Nishina Center for Accelerator-Based Science)
R. G. T. Zegers
(National Superconducting Cyclotron Laboratory, MSU)
Co-authors
A. Cole
(Kalamanzoo College)
A. Prinke
(National Superconducting Cyclotron Laboratory, MSU)
A. Stolz
(National Superconducting Cyclotron Laboratory, MSU)
B. A. Brown
(National Superconducting Cyclotron Laboratory, MSU)
C. Caesar
(GSI Darmstadt)
C. J. Guess
(University Massachusetts Lowell)
D. Bazin
(National Superconducting Cyclotron Laboratory, MSU)
F. Montes
(National Superconducting Cyclotron Laboratory, MSU)
G. W. Hitt
(Khalifa University of Science)
H. Sakai
(RIKEN Nishina Center)
J. M. Deaven
(National Superconducting Cyclotron Laboratory, MSU)
J. Palardy
(Ursinus College)
K. Yako
(University of Tokyo)
L. A. Riley
(Ursinus College)
L. Valdez
(National Superconducting Cyclotron Laboratory, MSU)
M. Scott
(National Superconducting Cyclotron Laboratory, MSU)
N. Ferranate
(Ursinus College)
R. Meharchand
(National Superconducting Cyclotron Laboratory, MSU)
Sam M. Austin
(National Superconducting Cyclotron Laboratory, MSU)
