skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Lifetime measurement of the 6.79 MeV state in {sup 15}O with the AGATA demonstrator

Abstract

The preliminary results of a new direct measurement of the lifetime of the first excited 3/2{sup +} state in {sup 15}O are discussed. An accurate evaluation of this lifetime is of paramount importance for the determination of the cross section of the {sup 14}N(p,{gamma}){sup 15}O reaction, the slowest one in the CNO cycle, at the energies of the solar Gamow peak. The {sup 2}H({sup 14}N,{sup 15}O)n reaction in inverse kinematics at 32MeV beam energy (XTU Tandem, LNL) was used to populate the level of interest, which decays via a 6.79 MeV E1 gamma-ray transition to the ground state. Gamma rays were detected with 4 triple clusters of HPGe detectors of the AGATA Demonstrator array. The energy resolution and position sensitivity of this state-of-the-art gamma-ray spectrometer have been exploited to investigate the Doppler Shift Attenuation effect on the lineshape of the gamma-ray peak in the energy spectrum. The deconvolution of the lifetime effects from those due to the kinematics of the emitting nuclei has been performed using detailed Monte Carlo simulations of the gamma emission and detection. CDCC-CRC calculations for the nucleon transfer process have been used for this purpose and preliminary results are shown.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1] more »;  [2]; « less
  1. Dipartimento di Fisica e Astronomia Galileo Galilei, Universita di Padova (Italy) and INFN Padova (Italy)
  2. (Italy)
Publication Date:
OSTI Identifier:
22075757
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1484; Journal Issue: 1; Conference: Conference on origin of matter and evolution of galaxies 2011, Wako (Japan), 14-17 Nov 2011; Other Information: (c) 2012 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; CNO CYCLE; COMPUTERIZED SIMULATION; CROSS SECTIONS; DOPPLER EFFECT; ENERGY RESOLUTION; ENERGY SPECTRA; GAMMA DECAY; GAMMA RADIATION; GAMMA SPECTROMETERS; GAMMA SPECTROSCOPY; GROUND STATES; HIGH-PURITY GE DETECTORS; LIFETIME; MEV RANGE; MONTE CARLO METHOD; NITROGEN 14; OXYGEN 15; PROTON REACTIONS; PROTON-NUCLEON INTERACTIONS

Citation Formats

Michelagnoli, C., Depalo, R., Ur, C. A., Menegazzo, R., Broggini, C., Bazzacco, D., Caciolli, A., Farnea, E., Lunardi, S., Bemmerer, D., Keeley, N., Erhard, M., Fueloep, Zs., Gottardo, A., Marta, M., Mengoni, D., Mijatovic, T., Recchia, F., Rossi-Alvarez, C., Szuecs, T., Dipartimento di Fisica e Astronomia Galileo Galilei, Universita di Padova, and and others. Lifetime measurement of the 6.79 MeV state in {sup 15}O with the AGATA demonstrator. United States: N. p., 2012. Web. doi:10.1063/1.4763408.
Michelagnoli, C., Depalo, R., Ur, C. A., Menegazzo, R., Broggini, C., Bazzacco, D., Caciolli, A., Farnea, E., Lunardi, S., Bemmerer, D., Keeley, N., Erhard, M., Fueloep, Zs., Gottardo, A., Marta, M., Mengoni, D., Mijatovic, T., Recchia, F., Rossi-Alvarez, C., Szuecs, T., Dipartimento di Fisica e Astronomia Galileo Galilei, Universita di Padova, & and others. Lifetime measurement of the 6.79 MeV state in {sup 15}O with the AGATA demonstrator. United States. doi:10.1063/1.4763408.
Michelagnoli, C., Depalo, R., Ur, C. A., Menegazzo, R., Broggini, C., Bazzacco, D., Caciolli, A., Farnea, E., Lunardi, S., Bemmerer, D., Keeley, N., Erhard, M., Fueloep, Zs., Gottardo, A., Marta, M., Mengoni, D., Mijatovic, T., Recchia, F., Rossi-Alvarez, C., Szuecs, T., Dipartimento di Fisica e Astronomia Galileo Galilei, Universita di Padova, and and others. Mon . "Lifetime measurement of the 6.79 MeV state in {sup 15}O with the AGATA demonstrator". United States. doi:10.1063/1.4763408.
@article{osti_22075757,
title = {Lifetime measurement of the 6.79 MeV state in {sup 15}O with the AGATA demonstrator},
author = {Michelagnoli, C. and Depalo, R. and Ur, C. A. and Menegazzo, R. and Broggini, C. and Bazzacco, D. and Caciolli, A. and Farnea, E. and Lunardi, S. and Bemmerer, D. and Keeley, N. and Erhard, M. and Fueloep, Zs. and Gottardo, A. and Marta, M. and Mengoni, D. and Mijatovic, T. and Recchia, F. and Rossi-Alvarez, C. and Szuecs, T. and Dipartimento di Fisica e Astronomia Galileo Galilei, Universita di Padova and and others},
abstractNote = {The preliminary results of a new direct measurement of the lifetime of the first excited 3/2{sup +} state in {sup 15}O are discussed. An accurate evaluation of this lifetime is of paramount importance for the determination of the cross section of the {sup 14}N(p,{gamma}){sup 15}O reaction, the slowest one in the CNO cycle, at the energies of the solar Gamow peak. The {sup 2}H({sup 14}N,{sup 15}O)n reaction in inverse kinematics at 32MeV beam energy (XTU Tandem, LNL) was used to populate the level of interest, which decays via a 6.79 MeV E1 gamma-ray transition to the ground state. Gamma rays were detected with 4 triple clusters of HPGe detectors of the AGATA Demonstrator array. The energy resolution and position sensitivity of this state-of-the-art gamma-ray spectrometer have been exploited to investigate the Doppler Shift Attenuation effect on the lineshape of the gamma-ray peak in the energy spectrum. The deconvolution of the lifetime effects from those due to the kinematics of the emitting nuclei has been performed using detailed Monte Carlo simulations of the gamma emission and detection. CDCC-CRC calculations for the nucleon transfer process have been used for this purpose and preliminary results are shown.},
doi = {10.1063/1.4763408},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1484,
place = {United States},
year = {2012},
month = {11}
}