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Title: In-beam γ-ray spectroscopy at the proton dripline: 40Sc

Abstract

We report on the first in-beam gamma-ray spectroscopy of the proton-dripline nucleus Sc-40 using two-nucleon pickup onto an intermediate-energy rare-isotope beam of Ca-38. The Be-9(Ca-38,Sc-40+gamma)X reaction at 60.9 MeV/nucleon mid-target energy selectively populates states in Sc-40 for which the transferred proton and neutron couple to high orbital angular momentum. In turn, due to angular-momentum selection rules in proton emission and the nuclear structure and energetics of Ca-39, such states in Sc-40 then exhibit gamma-decay branches although they are well above the proton separation energy. This work uniquely complements results from particle spectroscopy following charge-exchange reactions on Ca-40 as well as Ti-40 EC/beta(+) decay which both display very different selectivities. The population and gamma-ray decay of the previously known first (5(-)) state at 892 keV and the observation of a new level at 2744 keV are discussed in comparison to the mirror nucleus and shell-model calculations. On the experimental side, this work shows that high-resolution in-beam gamma-ray spectroscopy is possible with new generation Ge arrays for reactions induced by rare-isotope beams on the level of a few mu b of cross section. (C) 2020 The Author(s). Published by Elsevier B.V.

Authors:
ORCiD logo; ; ; ; ; ORCiD logo; ; ; ; ; ; ;
Publication Date:
Research Org.:
Michigan State Univ., East Lansing, MI (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
OSTI Identifier:
1641875
Alternate Identifier(s):
OSTI ID: 1642516; OSTI ID: 1774260
Grant/Contract Number:  
NA0003180; SC0020451; FG02-87ER40316; AC02-06CH11357; SC0019034; PHY-1565546; PHY-1811855
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Name: Physics Letters B Journal Volume: 808 Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Gade, A., Weisshaar, D., Brown, B. A., Tostevin, J. A., Bazin, D., Brown, K., Charity, R. J., Farris, P. J., Hill, A. M., Li, J., Longfellow, B., Reviol, W., and Rhodes, D. In-beam γ-ray spectroscopy at the proton dripline: 40Sc. Netherlands: N. p., 2020. Web. https://doi.org/10.1016/j.physletb.2020.135637.
Gade, A., Weisshaar, D., Brown, B. A., Tostevin, J. A., Bazin, D., Brown, K., Charity, R. J., Farris, P. J., Hill, A. M., Li, J., Longfellow, B., Reviol, W., & Rhodes, D. In-beam γ-ray spectroscopy at the proton dripline: 40Sc. Netherlands. https://doi.org/10.1016/j.physletb.2020.135637
Gade, A., Weisshaar, D., Brown, B. A., Tostevin, J. A., Bazin, D., Brown, K., Charity, R. J., Farris, P. J., Hill, A. M., Li, J., Longfellow, B., Reviol, W., and Rhodes, D. Tue . "In-beam γ-ray spectroscopy at the proton dripline: 40Sc". Netherlands. https://doi.org/10.1016/j.physletb.2020.135637.
@article{osti_1641875,
title = {In-beam γ-ray spectroscopy at the proton dripline: 40Sc},
author = {Gade, A. and Weisshaar, D. and Brown, B. A. and Tostevin, J. A. and Bazin, D. and Brown, K. and Charity, R. J. and Farris, P. J. and Hill, A. M. and Li, J. and Longfellow, B. and Reviol, W. and Rhodes, D.},
abstractNote = {We report on the first in-beam gamma-ray spectroscopy of the proton-dripline nucleus Sc-40 using two-nucleon pickup onto an intermediate-energy rare-isotope beam of Ca-38. The Be-9(Ca-38,Sc-40+gamma)X reaction at 60.9 MeV/nucleon mid-target energy selectively populates states in Sc-40 for which the transferred proton and neutron couple to high orbital angular momentum. In turn, due to angular-momentum selection rules in proton emission and the nuclear structure and energetics of Ca-39, such states in Sc-40 then exhibit gamma-decay branches although they are well above the proton separation energy. This work uniquely complements results from particle spectroscopy following charge-exchange reactions on Ca-40 as well as Ti-40 EC/beta(+) decay which both display very different selectivities. The population and gamma-ray decay of the previously known first (5(-)) state at 892 keV and the observation of a new level at 2744 keV are discussed in comparison to the mirror nucleus and shell-model calculations. On the experimental side, this work shows that high-resolution in-beam gamma-ray spectroscopy is possible with new generation Ge arrays for reactions induced by rare-isotope beams on the level of a few mu b of cross section. (C) 2020 The Author(s). Published by Elsevier B.V.},
doi = {10.1016/j.physletb.2020.135637},
journal = {Physics Letters B},
number = C,
volume = 808,
place = {Netherlands},
year = {2020},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.physletb.2020.135637

Figures / Tables:

Figure 1 Figure 1: Part of the nuclear chart around 40Sc. In fact, 40Sc is the heaviest dripline nucleus for which the directly neighboring isobar (40Ca) is actually stable, allowing for extensive charge-exchange studies with stable beams and targets. The only other such isobar pair in the sd shell or above ismore » 20Na (dripline) - 20Ne (stable). Nevertheless, γ-ray spectroscopy of 40Sc had never been performed.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.