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Lifetime of {sup 44}Ti as probe for supernova models

Abstract

The recent observation of {sup 44}Ti radioactivity in the supernova remnant Cassiopeia A with the Compton Gamma Ray Observatory allows the determination of the absolute amount of {sup 44}Ti. This provides a test for current supernova models. The main uncertainty is the lifetime of {sup 44}Ti. We report a new measurement of the lifetime of {sup 44}Ti applying a novel technique. A mixed radioactive beam containing {sup 44}Ti as well as {sup 22}Na was implanted and the resulting {gamma}-activity was measured. This allowed the determination of the lifetime of {sup 44}Ti relative to the lifetime of {sup 22}Na, {tau} = (87.0 {+-} 1.9) y. With this lifetime, the {sup 44}Ti abundance agrees with theoretical predictions within the remaining observational uncertainties. (orig.)
Authors:
Goerres, J; Meissner, J; Schatz, H; Stech, E; Tischhauser, P; Wiescher, M; [1]  Bazin, D; Harkewicz, R; Hellstroem, M; Sherrill, B; Steiner, M; [2]  Boyd, R N; [3]  Buchmann, L; [4]  Hartmann, D H; [5]  Hinnefeld, J D [6] 
  1. Univ. of Notre Dame, Notre Dame, IN (United States)
  2. Michigan State Univ., East Lansing, MI (United States)
  3. Ohio State Univ., Columbus, OH (United States)
  4. TRIUMF, Vancouver, BC (Canada)
  5. Clemson Univ., Clemson, SC (United States)
  6. Indiana Univ. South Bend, South Bend, IN (United States)
Publication Date:
Jun 01, 1998
Product Type:
Technical Report
Report Number:
INIS-DE-0012; CONF-980147-
Reference Number:
SCA: 663210; 663540; PA: DEN-98:0F8400; EDB-98:064198; SN: 98001968957
Resource Relation:
Conference: Hirschegg `98: 26. international workshop on gross properties of nuclei and nuclear excitations: Nuclear astrophysics, Hirschegg (Austria), 11-17 Jan 1998; Other Information: PBD: 1998; Related Information: Is Part Of Nuclear astrophysics. International workshop XXVI on gross properties of nuclei and nuclear excitations. Proceedings; Buballa, M.; Noerenberg, W.; Wambach, J.; Wirzba, A. [eds.]; PB: 442 p.
Subject:
66 PHYSICS; TITANIUM 44; LIFETIME; SUPERNOVAE; ELECTRON CAPTURE DECAY; EXPERIMENTAL DATA
OSTI ID:
613405
Research Organizations:
Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE98761189; TRN: DE98F8400
Availability:
INIS; OSTI as DE98761189
Submitting Site:
DEN
Size:
pp. 182-186
Announcement Date:

Citation Formats

Goerres, J, Meissner, J, Schatz, H, Stech, E, Tischhauser, P, Wiescher, M, Bazin, D, Harkewicz, R, Hellstroem, M, Sherrill, B, Steiner, M, Boyd, R N, Buchmann, L, Hartmann, D H, and Hinnefeld, J D. Lifetime of {sup 44}Ti as probe for supernova models. Germany: N. p., 1998. Web.
Goerres, J, Meissner, J, Schatz, H, Stech, E, Tischhauser, P, Wiescher, M, Bazin, D, Harkewicz, R, Hellstroem, M, Sherrill, B, Steiner, M, Boyd, R N, Buchmann, L, Hartmann, D H, & Hinnefeld, J D. Lifetime of {sup 44}Ti as probe for supernova models. Germany.
Goerres, J, Meissner, J, Schatz, H, Stech, E, Tischhauser, P, Wiescher, M, Bazin, D, Harkewicz, R, Hellstroem, M, Sherrill, B, Steiner, M, Boyd, R N, Buchmann, L, Hartmann, D H, and Hinnefeld, J D. 1998. "Lifetime of {sup 44}Ti as probe for supernova models." Germany.
@misc{etde_613405,
title = {Lifetime of {sup 44}Ti as probe for supernova models}
author = {Goerres, J, Meissner, J, Schatz, H, Stech, E, Tischhauser, P, Wiescher, M, Bazin, D, Harkewicz, R, Hellstroem, M, Sherrill, B, Steiner, M, Boyd, R N, Buchmann, L, Hartmann, D H, and Hinnefeld, J D}
abstractNote = {The recent observation of {sup 44}Ti radioactivity in the supernova remnant Cassiopeia A with the Compton Gamma Ray Observatory allows the determination of the absolute amount of {sup 44}Ti. This provides a test for current supernova models. The main uncertainty is the lifetime of {sup 44}Ti. We report a new measurement of the lifetime of {sup 44}Ti applying a novel technique. A mixed radioactive beam containing {sup 44}Ti as well as {sup 22}Na was implanted and the resulting {gamma}-activity was measured. This allowed the determination of the lifetime of {sup 44}Ti relative to the lifetime of {sup 22}Na, {tau} = (87.0 {+-} 1.9) y. With this lifetime, the {sup 44}Ti abundance agrees with theoretical predictions within the remaining observational uncertainties. (orig.)}
place = {Germany}
year = {1998}
month = {Jun}
}