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Nuclear structure of 157Sm via β– decay of 157Pm

Technical Report ·
DOI:https://doi.org/10.2172/2475966· OSTI ID:2475966
 [1];  [2];  [2];  [3];  [4];  [2];  [2];  [1];  [5];  [2];  [6];  [7]
  1. US Naval Academy, Annapolis, MD (United States)
  2. Argonne National Laboratory (ANL), Argonne, IL (United States)
  3. Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Manitoba, Winnipeg, MB (Canada)
  4. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  5. Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Chicago, IL (United States)
  6. Argonne National Laboratory (ANL), Argonne, IL (United States); Louisiana State Univ., Baton Rouge, LA (United States)
  7. Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
+ Show Author Affiliations
Excited states of the neutron-rich nucleus 157Sm were populated through the β– decay of 157Pm, which has a tentatively assigned ground-state spin and parity of Jπ = (5/2–). Over 30 levels have been observed, 16 of which are new, and over 45 new γ-ray transitions have been placed in the level scheme. An evolution in the ground-state configurations for N = 95 nuclei from 5/2–[523] (Er/Yb), to 5/2+[642] (Dy), to 3/2–[521] (Sm/Gd) can be explained based on increasing deformation from Z = 70 to Z = 62 and the fact that these three orbitals are energetically close to each other at deformations near β2 ≈ 0.25 – 0.3. Tentative spin and parity assignments are made for most of the states below 1500 keV based on the decay properties of the levels and using excitation-energy systematics of the various orbitals observed in N = 95 nuclei.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
DOE Contract Number:
SC0012704; AC02-06CH11357
OSTI ID:
2475966
Report Number(s):
BNL--226286-2024-INRE
Country of Publication:
United States
Language:
English

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Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS