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Title: JANUS — A setup for low-energy Coulomb excitation at ReA3

Abstract

We report that a new experimental setup for low-energy Coulomb excitation experiments was constructed in a collaboration between the National Superconducting Cyclotron Laboratory (NSCL), Lawrence Livermore National Laboratory (LLNL), and the University of Rochester and was commissioned at the general purpose beam line of NSCL's ReA3 reaccelerator facility. The so-called JANUS setup combines γ-ray detection with the Segmented Ge Array (SeGA) and scattered particle detection using a pair of segmented double-sided Si detectors (Bambino 2). The low-energy Coulomb excitation program that JANUS enables will complement intermediate-energy Coulomb excitation studies that have long been performed at NSCL by providing access to observables that quantify collectivity beyond the first excited state, including the sign and magnitude of excited-state quadrupole moments. Here, in this work, the setup and its performance will be described based on the commissioning run that used stable 78Kr impinging onto a 1.09 mg/cm 2 208Pb target at a beam energy of 3.9 MeV/u.

Authors:
 [1];  [2];  [2];  [3];  [4];  [1];  [1];  [5];  [1];  [5];  [2];  [3]
  1. Michigan State University, East Lansing, MI (United States). National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy
  2. Michigan State University, East Lansing, MI (United States). National Superconducting Cyclotron Laboratory
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Univ. of Rochester, NY (United States). Department of Physics
  5. Michigan State University, East Lansing, MI (United States). National Superconducting Cyclotron Laboratory and Department of Chemistry
Publication Date:
Research Org.:
Michigan State University, East Lansing, MI (United States). National Superconducting Cyclotron Laboratory; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Michigan State Univ., East Lansing, MI (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF)
OSTI Identifier:
1416318
Alternate Identifier(s):
OSTI ID: 1416506; OSTI ID: 1430732
Report Number(s):
LLNL-JRNL-739594
Journal ID: ISSN 0168-9002; PII: S0168900217314638; TRN: US1800920
Grant/Contract Number:
NA0003180; FG02-08ER41556; AC52-07NA27344; NA0002132; PHY-1565546; PHY-0969079
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 885; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Low-energy Coulomb excitation; Collectivity; low-energy coulomb excitation; collectivity

Citation Formats

Lunderberg, E., Belarge, J., Bender, P. C., Bucher, B., Cline, D., Elman, B., Gade, A., Liddick, S. N., Longfellow, B., Prokop, C., Weisshaar, D., and Wu, C. Y. JANUS — A setup for low-energy Coulomb excitation at ReA3. United States: N. p., 2017. Web. doi:10.1016/j.nima.2017.12.057.
Lunderberg, E., Belarge, J., Bender, P. C., Bucher, B., Cline, D., Elman, B., Gade, A., Liddick, S. N., Longfellow, B., Prokop, C., Weisshaar, D., & Wu, C. Y. JANUS — A setup for low-energy Coulomb excitation at ReA3. United States. doi:10.1016/j.nima.2017.12.057.
Lunderberg, E., Belarge, J., Bender, P. C., Bucher, B., Cline, D., Elman, B., Gade, A., Liddick, S. N., Longfellow, B., Prokop, C., Weisshaar, D., and Wu, C. Y. Thu . "JANUS — A setup for low-energy Coulomb excitation at ReA3". United States. doi:10.1016/j.nima.2017.12.057.
@article{osti_1416318,
title = {JANUS — A setup for low-energy Coulomb excitation at ReA3},
author = {Lunderberg, E. and Belarge, J. and Bender, P. C. and Bucher, B. and Cline, D. and Elman, B. and Gade, A. and Liddick, S. N. and Longfellow, B. and Prokop, C. and Weisshaar, D. and Wu, C. Y.},
abstractNote = {We report that a new experimental setup for low-energy Coulomb excitation experiments was constructed in a collaboration between the National Superconducting Cyclotron Laboratory (NSCL), Lawrence Livermore National Laboratory (LLNL), and the University of Rochester and was commissioned at the general purpose beam line of NSCL's ReA3 reaccelerator facility. The so-called JANUS setup combines γ-ray detection with the Segmented Ge Array (SeGA) and scattered particle detection using a pair of segmented double-sided Si detectors (Bambino 2). The low-energy Coulomb excitation program that JANUS enables will complement intermediate-energy Coulomb excitation studies that have long been performed at NSCL by providing access to observables that quantify collectivity beyond the first excited state, including the sign and magnitude of excited-state quadrupole moments. Here, in this work, the setup and its performance will be described based on the commissioning run that used stable 78Kr impinging onto a 1.09 mg/cm2 208Pb target at a beam energy of 3.9 MeV/u.},
doi = {10.1016/j.nima.2017.12.057},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 885,
place = {United States},
year = {Thu Dec 21 00:00:00 EST 2017},
month = {Thu Dec 21 00:00:00 EST 2017}
}

Journal Article:
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  • We constructed a new experimental setup for low-energy Coulomb excitation experiments in a collaboration between the National Superconducting Cyclotron Laboratory (NSCL), Lawrence Livermore National Laboratory (LLNL), and the University of Rochester and was commissioned at the general purpose beam line of NSCL’s ReA3 reaccelerator facility. The so-called JANUS setup combines γ-ray detection with the Segmented Ge Array (SeGA) and scattered particle detection using a pair of segmented double-sided Si detectors (Bambino 2). Furthermore, the low-energy Coulomb excitation program that JANUS enables will complement intermediate-energy Coulomb excitation studies that have long been performed at NSCL by providing access to observables thatmore » quantify collectivity beyond the first excited state, including the sign and magnitude of excited-state quadrupole moments. In this work, the setup and its performance will be described based on the commissioning run that used stable 78Kr impinging onto a 1.09 mg/cm 2 208Pb target at a beam energy of 3.9 MeV/u.« less
  • A new experimental setup for low-energy Coulomb excitation experiments was constructed in a collaboration between the National Superconducting Cyclotron Laboratory (NSCL), Lawrence Livermore National Laboratory (LLNL), and the University of Rochester and was commissioned at the general purpose beam line of NSCL’s ReA3 reaccelerator facility. The so-called JANUS setup combines -ray detection with the Segmented Ge Array (SeGA) and scattered particle detection using a pair of segmented double-sided Si detectors (Bambino 2). The low-energy Coulomb excitation program that JANUS enables will complement intermediate-energy Coulomb excitation studies that have long been performed at NSCL by providing access to observables that quantifymore » collectivity beyond the first excited state, including the sign and magnitude of excited-state quadrupole moments. In this work, the setup and its performance will be described based on the commissioning run that used stable 78Kr impinging onto a 1.09 mg/cm 208Pb target at a beam energy of 3.9 MeV/u.« less
  • Coulomb excitation is a powerful, well-understood, and selective technique to excite levels in nuclei primarily through E2 transitions with relatively large cross sections (typically 10s of mbarns). A description of an apparatus to measure total Coulomb excitation cross sections of radioactive nuclear beams will be presented. The apparatus uses inverse kinematics in order to overcome the difficulties presented by limited beam intensities and high background rates. A high efficiency NaI(Tl) through-well detector is used to observe the deexcitation {gamma}-rays. The discussion will address the challenges of doing low energy Coulomb excitation experiments of radioactive beam nuclei and a recent experimentmore » with radioactive {sup 69}As nuclei at the Holifield Radioactive Ion Beam Facility (HRIBF). {copyright} {ital 1998 American Institute of Physics.}« less