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Title: Mass measurement in the fp-shell using the TOFI spectrometer

Abstract

The masses of 48 neutron-rich nuclei extending from {sup 55}Sc to {sup 75}Cu have been determined from the final set of data to be acquired with the time-of-flight-isochronous (TOFI) spectrometer. The masses of eight isotopes ({sup 68}Fe, {sup 70,71}Co, {sup 73}Ni, and {sup 72-75}Cu) are reported for the first time. The resulting masses now tie in neatly with the masses of previously measured neutron-rich Zn and Ga isotopes determined from fission product {beta}-endpoint measurements. A careful evaluation of the calibration sensitivity is made with respect to inclusion or exclusion of these heavy known species and excellent calibration stability is found. Contrasting these results with previous TOFI measurements, we find that these new results fall between the results of Tu et al. (1) which trend to slightly less bound masses as one proceeds to the most neutron-rich species and Seifert et al. (2) which shows the opposite trend. Good agreement with the predictions of several mass models and Audi-Wapstra systematics are found.

Authors:
 [1]; ; ;  [1]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
21207891
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 455; Journal Issue: 1; Conference: ENAM 98: 2. international conference on exotic nuclei and atomic masses, Bellaire, MI (United States), 23-27 Jun 1998; Other Information: DOI: 10.1063/1.57312; (c) 1998 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COBALT 71; COPPER 75; FISSION FRAGMENT DETECTION; FISSION FRAGMENTS; GALLIUM ISOTOPES; IRON 68; MASS NUMBER; NEUTRON-RICH ISOTOPES; NEUTRONS; NICKEL 73; PROTON REACTIONS; PROTON-NUCLEON INTERACTIONS; SCANDIUM 55; TIME-OF-FLIGHT METHOD; ZINC ISOTOPES

Citation Formats

Bai, Y, Physics Department, Utah State University, Logan, Utah 84322, Vieira, D J, Seifert, H L, and Wouters, J M. Mass measurement in the fp-shell using the TOFI spectrometer. United States: N. p., 1998. Web. doi:10.1063/1.57312.
Bai, Y, Physics Department, Utah State University, Logan, Utah 84322, Vieira, D J, Seifert, H L, & Wouters, J M. Mass measurement in the fp-shell using the TOFI spectrometer. United States. https://doi.org/10.1063/1.57312
Bai, Y, Physics Department, Utah State University, Logan, Utah 84322, Vieira, D J, Seifert, H L, and Wouters, J M. 1998. "Mass measurement in the fp-shell using the TOFI spectrometer". United States. https://doi.org/10.1063/1.57312.
@article{osti_21207891,
title = {Mass measurement in the fp-shell using the TOFI spectrometer},
author = {Bai, Y and Physics Department, Utah State University, Logan, Utah 84322 and Vieira, D J and Seifert, H L and Wouters, J M},
abstractNote = {The masses of 48 neutron-rich nuclei extending from {sup 55}Sc to {sup 75}Cu have been determined from the final set of data to be acquired with the time-of-flight-isochronous (TOFI) spectrometer. The masses of eight isotopes ({sup 68}Fe, {sup 70,71}Co, {sup 73}Ni, and {sup 72-75}Cu) are reported for the first time. The resulting masses now tie in neatly with the masses of previously measured neutron-rich Zn and Ga isotopes determined from fission product {beta}-endpoint measurements. A careful evaluation of the calibration sensitivity is made with respect to inclusion or exclusion of these heavy known species and excellent calibration stability is found. Contrasting these results with previous TOFI measurements, we find that these new results fall between the results of Tu et al. (1) which trend to slightly less bound masses as one proceeds to the most neutron-rich species and Seifert et al. (2) which shows the opposite trend. Good agreement with the predictions of several mass models and Audi-Wapstra systematics are found.},
doi = {10.1063/1.57312},
url = {https://www.osti.gov/biblio/21207891}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 455,
place = {United States},
year = {Mon Dec 21 00:00:00 EST 1998},
month = {Mon Dec 21 00:00:00 EST 1998}
}