The performance of the γ-ray tracking array GRETINA for γ-ray spectroscopy with fast beams of rare isotopes

Weißhaar, D.; Bazin, D.; Bender, P. C.; Campbell, C. M.; Recchia, F.; Bader, V. M.; Baugher, T.; Belarge, J.; Carpenter, M. P.; Crawford, H. L.; Cromaz, M.; Elman, B.; Fallon, P.; Forney, A. M.; Gade, A.; Harker, J.; Kobayashi, N.; Langer, C.; Lauritsen, T.; Lee, I.Y.; Lemasson, A.; Longfellow, B.; Lunderberg, E.; Macchiavelli, A. O.; Miki, K.; Momiyama, S.; Noji, S.; Radford, D. C.; Scott, M.; Sethi, J.; Stroberg, S. R.; Sullivan, Chris; Titus, R.; Wiens, A.; Williams, Spencer J.; Wimmer, K.; Zhu, S.

doi:10.1016/j.nima.2016.12.001

Cited by 74 publications

(40 citation statements)

References 26 publications

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“…Products of the knockout reactions from each secondary beam were identified via time-of-flight and energy-loss measurements, with corrections for position and angle dependence using the ion track information from the S800 spectrograph [27]. In-flight de-excitation γ rays of reaction products at the secondary 9 Be target position, were detected with the Gamma-Ray Energy Tracking In-beam Nuclear Array (GRETINA) [28]. GRETINA consisted of two rings with four detector modules centered at 58°and six at 90°, covering laboratory angles of 37°to 116°, with each module consisting of four 36-fold segmented HPGe crystals.…”

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confidence: 99%

Establishing the Maximum Collectivity in Highly Deformed N=Z Nuclei

Llewellyn¹,

Bentley²,

Wadsworth³

et al. 2020

Phys. Rev. Lett.

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The lifetimes of the first excited 2 þ states in the N ¼ Z nuclei 80 Zr, 78 Y, and 76 Sr have been measured using the γ-ray line shape method following population via nucleon-knockout reactions from intermediateenergy rare-isotope beams. The extracted reduced electromagnetic transition strengths yield new information on where the collectivity is maximized and provide evidence for a significant, and as yet unexplained, odd-odd vs even-even staggering in the observed values. The experimental results are analyzed in the context of state-of-the-art nuclear density-functional model calculations.

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confidence: 99%

Establishing the Maximum Collectivity in Highly Deformed N=Z Nuclei

Llewellyn¹,

Bentley²,

Wadsworth³

et al. 2020

Phys. Rev. Lett.

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“…Its well-known cross section [23] was used to calibrate a non-intercepting primary-beam current probe that served as an absolute measure for the triton beam intensity during the 88 Sr runs. The Gamma-Ray Energy Tracking In-beam Nuclear Array (GRETINA) [35,36], consisting of thirty-two 36fold segmented high-purity Ge detectors mounted on a hemisphere and providing about 1π solid-angle coverage, was positioned around the 88 Sr target. The use of GRETINA allowed for the precise determination of γ-ray energies with a high photopeak-detection efficiency (∼4% at 2 MeV).…”

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confidence: 99%

Experimental constraint on stellar electron-capture rates from the Sr88(t,He3+γ)
Zamora
¹
,
Zegers
²
,
Austin
³

et al. 2019
Phys. Rev. C
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The Gamow-Teller strength distribution from 88 Sr was extracted from a (t, 3 He + γ) experiment at 115 MeV/u to constrain estimates for the electron-capture rates on nuclei around N = 50, between and including 78 Ni and 88 Sr, which are important for the late evolution of core-collapse supernovae. The observed strength below an excitation energy of 8 MeV was consistent with zero and below 10 MeV amounted to 0.1 ± 0.05. Except for a very-weak transition that could come from the 2.231-MeV 1 + state, no γ lines that could be associated with the decay of known 1 + states were identified. The derived electron-capture rate from the measured strength distribution is more than an order of magnitude smaller than rates based on the single-state approximation presently used in astrophysical simulations for most nuclei near N = 50. Rates based on shell-model and quasiparticle random-phase approximation calculations that account for Pauli blocking and core-polarization effects provide better estimates than the single-state approximation, although a relatively strong transition to the first 1 + state in 88 Rb is not observed in the data. Pauli unblocking effects due to high stellar temperatures could partially counter the low electron-capture rates. The new data serves as a zero-temperature benchmark for constraining models used to estimate such effects.

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“…Thus, the main challenge in the experiment is to measure these quantities for all states up to 4 MeV in 24 Si, using a transfer method to populate the sates of interest (see [3] for more information). Our new experimental concept combines the state-of-the-art γ-ray detector GRETINA [6,7] with the neutron detector LENDA [8,9]. This setup gives us the opportunity to perform a measurement in full kinematics and obtain very precise level energies from the gamma data and the properties of the…”

Section: Methodsmentioning

confidence: 99%

Constraining the rp-process by measuring ²³Al(d,n)²⁴Si with GRETINA and LENDA at NSCL

et al. 2017

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Abstract. The 23 Al(p,γ) 24 Si stellar reaction rate has a significant impact on the lightcurve emitted in X-ray bursts. Theoretical calculations show that the reaction rate is mainly determined by the properties of direct capture as well as low-lying 2 + states and a possible 4 + state in 24 Si. Currently, there is little experimental information on the properties of these states. In this proceeding we will present a new experimental study to investigate this reaction, using the surrogate reaction 23 Al(d,n) at 47 AMeV at the National Superconducting Cyclotron Laboratory (NSCL). We will discuss our new experimental setup which allows us to use full kinematics employing the Gamma-Ray Energy Tracking In-beam Nuclear Array (GRETINA) to detect the γ-rays following the de-excitation of excited states of the reaction products and the Low Energy Neutron Detector Array (LENDA) to detect the recoiling neutrons. The S800 was used for identification of the 24 Si recoils. As a proof of principle to show the feasibility of this concept the Q-value spectrum of 22 Mg(d,n) 23 Al is reconstructed.

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The performance of the γ-ray tracking array GRETINA for γ-ray spectroscopy with fast beams of rare isotopes

Cited by 74 publications

References 26 publications

Establishing the Maximum Collectivity in Highly Deformed N=Z Nuclei

Establishing the Maximum Collectivity in Highly Deformed N=Z Nuclei

Experimental constraint on stellar electron-capture rates from the Sr88(t,He3+γ)
Zamora
¹
,
Zegers
²
,
Austin
³

et al. 2019
Phys. Rev. C
Self Cite

Constraining the rp-process by measuring ²³Al(d,n)²⁴Si with GRETINA and LENDA at NSCL

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The performance of the γ-ray tracking array GRETINA for γ-ray spectroscopy with fast beams of rare isotopes

Cited by 74 publications

References 26 publications

Establishing the Maximum Collectivity in Highly Deformed N=Z Nuclei

Establishing the Maximum Collectivity in Highly Deformed N=Z Nuclei

Experimental constraint on stellar electron-capture rates from the Sr88(t,He3+γ)Zamora1, Zegers2, Austin3 et al. 2019Phys. Rev. CSelf Cite

Constraining the rp-process by measuring 23Al(d,n)24Si with GRETINA and LENDA at NSCL

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Experimental constraint on stellar electron-capture rates from the Sr88(t,He3+γ)
Zamora
¹
,
Zegers
²
,
Austin
³

et al. 2019
Phys. Rev. C
Self Cite

Constraining the rp-process by measuring ²³Al(d,n)²⁴Si with GRETINA and LENDA at NSCL