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Measurement of the $$\textit{B}(\textit{E}2 ↑)$$ strengths of 36Ca and 38Ca

Journal Article · · Physical Review. C
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  1. Washington Univ., St. Louis, MO (United States)
  2. Michigan State Univ., East Lansing, MI (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
+ Show Author Affiliations
In this work, the $$B(E2, 0^+_1 → 2^+_1)$$ strengths of 36Ca and 38Ca are measured to be 131(20) $$e^2\text{fm}^4$$ and 101(11) $$e^2\text{fm}^4$$, respectively. The $$\textit{B}(\textit{E}2)$$ value for 36Ca required a measurement of the p/γ branching ratio because the 2+ state is proton unbound. This branching ratio is $$B_p$$=0.087(8). These $$\textit{B}(\textit{E}2)$$ and branching-ratio values can be reproduced in the shell-model with the ZMB2 interaction, an interaction that predicts the $$\textit{Z} = 20 \textit{sd}$$-shell closure is incomplete with large proton pf-shell occupancies in the ground state. These occupancies are at odds with other shell-model and energy-density-functional calculations of 36Ca. New data are used to provide an update on constraints of the density dependence of the symmetry energy through mirror charge-radii differences as well as to help reduce uncertainties of the astrophysical important 35K(p,γ) reaction.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-06CH11357; FG02-87ER40316; NA0003180; SC0019034; SC0020451
OSTI ID:
1971656
Alternate ID(s):
OSTI ID: 1971843
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 3 Vol. 107; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (16)

FIG. 1(p. 4)figure FIG. 1
FIG. 2(p. 5)figure FIG. 2
FIG. 3(p. 5)figure FIG. 3
TABLE I(p. 5)table TABLE I
FIG. 4(p. 6)figure FIG. 4
FIG. 5(p. 6)figure FIG. 5
FIG. 6(p. 7)figure FIG. 6
FIG. 7(p. 8)figure FIG. 7
TABLE II(p. 8)table TABLE II
FIG. 8(p. 9)figure FIG. 8
TABLE III(p. 9)table TABLE III
FIG. 9(p. 10)figure FIG. 9
TABLE IV(p. 10)table TABLE IV
FIG. 10(p. 11)figure FIG. 10
TABLE V(p. 11)table TABLE V
TABLE VI(p. 13)table TABLE VI

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