Observation of Doppler broadening in β -delayed proton- γ decay

Schwartz, S. B.; Wrede, C.; Bennett, M. B.; Liddick, S. N.; Pérez-Loureiro, D.; Bowe, A.; Chen, A. A.; Chipps, K. A.; Cooper, N.; Irvine, D.; McNeice, E.; Montes, F.; Naqvi, F.; Ortez, R.; Pain, S. D.; Pereira, J.; Prokop, C.; Quaglia, J.; Quinn, S. J.; Sakstrup, J.; Santia, M.; Shanab, S.; Simon, A.; Spyrou, A.; Thiagalingam, E.

doi:10.1103/PhysRevC.92.031302

Title: Observation of Doppler broadening in $β$ -delayed proton- $γ$ decay

Journal Article · Mon Sep 14 00:00:00 EDT 2015 · Physical Review C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.92.031302· OSTI ID:1261466

Schwartz, S. B. ^[1]; Wrede, C. ^[2]; Bennett, M. B. ^[2]; Liddick, S. N. ^[2]; Pérez-Loureiro, D. ^[2]; Bowe, A. ^[3]; Chen, A. A. ^[4]; Chipps, K. A. ^[5]; Cooper, N. ^[6]; Irvine, D. ^[4]; McNeice, E. ^[4]; Montes, F. ^[2]; Naqvi, F. ^[6]; Ortez, R. ^[7]; Pain, S. D. ^[8]; Pereira, J. ^[2]; Prokop, C. ^[2]; Quaglia, J. ^[2]; Quinn, S. J. ^[2]; Sakstrup, J. ^[2] more »

Michigan State Univ., East Lansing, MI (United States); Univ. of Southern Indiana, Evansville, IN (United States)
Michigan State Univ., East Lansing, MI (United States)
Michigan State Univ., East Lansing, MI (United States); Kalamazoo College, MI (United States)
McMaster Univ., Hamilton, ON (Canada)
Colorado School of Mines, Golden, CO (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Yale Univ., New Haven, CT (United States)
Michigan State Univ., East Lansing, MI (United States); Univ. of Washington, Seattle, WA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Michigan State Univ., East Lansing, MI (United States); Univ. of Notre Dame, IN (United States)

Background: The Doppler broadening of gamma-ray peaks is due to nuclear recoil from beta-delayed nucleon emission can be used to measure the energies of the nucleons. This method has never been tested using beta-delayed proton emission or applied to a recoil heavier than A = 10. Purpose: To test and apply this Doppler broadening method using gamma-ray peaks from the P-26(beta p gamma)Al-25 decay sequence. Methods: A fast beam of P-26 was implanted into a planar Ge detector, which was used as a P-26 beta-decay trigger. The SeGA array of high-purity Ge detectors was used to detect gamma rays from the P-26(beta p gamma)Al-25 decay sequence. Results: Radiative Doppler broadening in beta-delayed proton-gamma decay was observed for the first time. Moreover, the Doppler broadening analysis method was verified using the 1613-keV gamma-ray line for which the proton energies were previously known. The 1776-keV gamma ray de-exciting the 2720 keV Al-25 level was observed in P-26(beta p gamma)Al-25 decay for the first time and used to determine that the center-of-mass energy of the proton emission feeding the 2720-keV level is 5.1 +/- 1.0 (stat.) +/- 0.6 (syst.) MeV, corresponding to a Si-26 excitation energy of 13.3 +/- 1.0 (stat.) +/- 0.6 (syst.) MeV for the proton-emitting level. Conclusions: Finally, the Doppler broadening method has been demonstrated to provide practical measurements of the energies for beta-delayed nucleon emissions populating excited states of nuclear recoils at least as heavy as A = 25.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; PHY-1102511; PHY 0822648; NA0000979

OSTI ID:: 1261466

Journal Information:: Physical Review C, Nuclear Physics, Vol. 92, Issue 3; ISSN 0556-2813

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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