Transition strengths and the role of the f{sub 7/2} orbital in {sup 71}As

Journal Article · Fri Apr 15 00:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.044316· OSTI ID:21499567

Kaye, R A; Drover, C J; Arora, S R; Baker, N R ^[1]; Tabor, S L; Hinners, T A; Hoffman, C R; Lee, S ^[2]; Doering, J ^[3]; Yang, Y -C; Sun, Y ^[4]; Bruckman, J K ^[5]

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1. Department of Physics and Astronomy, Ohio Wesleyan University, Delaware, Ohio 43015 (United States)
2. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
3. Bundesamt fuer Strahlenschutz, D-10318 Berlin (Germany)
4. Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 (China)
5. Department of Physics, Monmouth College, Monmouth, Illinois 61462 (United States)

High-spin states in {sup 71}As were studied using the {sup 54}Fe({sup 23}Na,{alpha}2p) reaction at 80 MeV. Prompt {gamma}-{gamma} coincidences were measured using the Florida State University Compton-suppressed Ge array consisting of three clover detectors and seven single-crystal detectors. The existing high-spin level scheme has been verified, and 21 new transitions have been added based on an investigation of weak {gamma}-ray coincidence relations and relative {gamma}-ray intensities. Lifetimes of 16 excited states were measured using the Doppler-shift attenuation method applied to the experimental line shapes of decays in all of the known rotational bands. The B(E2) strengths inferred from the lifetimes indicate that moderate to high collective behavior persists to the highest observed spins in the lowest positive- and negative-parity bands, in qualitative agreement with projected shell-model calculations. The band suggested to be based on the {pi}f{sub 7/2} orbital shows a similar degree of collectivity within the same spin range, with B(E2) values in good agreement with those predicted by the projected shell model assuming a constant prolate deformation of {epsilon}{sub 2}=+0.27. The experimental Q{sub t} values in this band are somewhat smaller than predicted by cranked Woods-Saxon calculations.

• OSTI ID: 21499567
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 83, Issue 4; Other Information: DOI: 10.1103/PhysRevC.83.044316; (c) 2011 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY
ARSENIC 71
DSA METHOD
E2-TRANSITIONS
GAMMA RADIATION
GE SEMICONDUCTOR DETECTORS
HIGH SPIN STATES
IRON 54 TARGET
LIFETIME
MEV RANGE 10-100
MONOCRYSTALS
NUCLEAR DEFORMATION
PARITY
PROTON-EMISSION DECAY
QUADRUPOLE MOMENTS
ROTATIONAL STATES
SHELL MODELS
SODIUM 23 REACTIONS
SPIN
WOODS-SAXON POTENTIAL
ANGULAR MOMENTUM
ARSENIC ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
COUNTING TECHNIQUES
CRYSTALS
DAYS LIVING RADIOISOTOPES
DECAY
DEFORMATION
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
HEAVY ION REACTIONS
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOTOPES
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MEV RANGE
MULTIPOLE TRANSITIONS
NUCLEAR DECAY
NUCLEAR MODELS
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUCLEI
ODD-EVEN NUCLEI
PARTICLE PROPERTIES
POTENTIALS
RADIATION DETECTORS
RADIATIONS
RADIOISOTOPES
SEMICONDUCTOR DETECTORS
TARGETS