Inverse-Kinematics Proton Scattering From 51Ca

Submission Date

7-24-2015

Document Type

Paper

Department

Physics & Astronomy

Faculty Mentor

Lew Riley

Comments

Presented during the 17th Annual Summer Fellows Symposium, July 24, 2015 at Ursinus College.

Supported by a National Science Foundation Research at Undergraduate Institutions (NSF RUI) grant (PHY-1303480).

Project Description

We have studied 51Ca using inverse kinematics proton scattering. The experiment was run at the National Superconducting Cyclotron Laboratory (NSCL) using the GRETINA gamma-ray tracking array and the Ursinus College/NSCL liquid hydrogen target. We used the UCGretina code to extract gamma-ray intensities from measured gamma-ray spectra. The reaction populated five excited states of 51Ca. We observed a new gamma ray with an energy of 3950 keV. The measured probabilities for exciting these states tell us about the interplay between collective and single-particle behavior. Proton scattering tends to excite collective states, i.e. states in which many protons and neutrons participate. This suggests that the new gamma ray at 3950 keV de-excited a collective state.

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