The structure of bromine-71.

Format:

Book

Thesis/Dissertation

Author/Creator:

Arrison, James Walter.

Contributor:

University of Pennsylvania.

Language:

English

Subjects (All):

Nuclear physics.

0610.

Local Subjects:

0610.

Physical Description:

165 pages

Contained In:

Dissertation Abstracts International 51-08B.

System Details:

Mode of access: World Wide Web.

text file

Summary:

Charged particle-neutron-$\gamma$ coincidences have been used to identify the first in-beam $\gamma$ transitions in $\sp{71}$Br, which was produced in the reaction $\sp{40}$Ca($\sp{34}$S,p2n)$\sp{71}$Br. The charged particles were detected and identified using a 4$\pi$ particle spectrometer designed specifically for the study of nuclei far from stability populated in very weak fusion evaporation reaction channels. Neutron-$\gamma$-$\gamma$ coincidences were used along with the $\sp{58}$Ni($\sp{16}$O,p2n)$\sp{71}$Br reaction to deduce the level scheme. An isomer attributed to the $\pi g\sb{9/2}$ state was found; its half-life was deduced from neutron-$\gamma$ timing to be 30.5 $\pm$ 4.5 nsec. The low energy negative parity states of $\sp{71}$Br were found to resemble that of its neighboring odd Br isotopes $\sp{73,75}$Br. In addition, a $\Delta$J = 2 band built on the observed $9\sp+\over2$ isomer has been identified. The decoupled nature of this band, as well as the existence of a nearby $5\sp+\over2$ state, favors an interpretation of a particle coupled to a core with prolate deformation. This is in strong contrast to the situation observed in the N = 35 system $\sp{69}$Se, where a strongly coupled band built on a low-lying $9\sp+\over2$ isomer seems to imply an oblate core. The apparent qualitative difference between the behavior of odd-Z and odd-N nuclei in this mass region may require improvements to theoretical calculations of nuclear equilibrium shapes in this mass region.

Notes:

Source: Dissertation Abstracts International, Volume: 51-08, Section: B, page: 3905.

Supervisor: David P. Balamuth.

Thesis (Ph.D.)--University of Pennsylvania, 1990.

Local Notes:

School code: 0175.

Access Restriction:

Restricted for use by site license.