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Title: The {sup 40}Ca(t,p){sup 42} Ca reaction at triton energies near 10 MeV per nucleon

Abstract

Two nucleon transfer reactions have been used to probe for correlations in nuclei but there have been doubts about the assumptions made and hence about the success of the analyses. An experimental study of the {sup 40}Ca(t,p){sup 42}Ca reaction at incident triton energies of 10{endash}15 MeV/nucleon was made to determine if the one-step, two-nucleon transfer mechanism was dominant at these energies. Measurements were made with 28, 33, and 37.3 MeV incident energy and particular care was taken to measure absolute differential cross sections for transitions to several residual states in {sup 42}Ca. The analysis of all the data used the results of full finite-range calculations and care was taken to calculate all the one-step and two-step reaction channels in a consistent manner starting from a shell-model description of the relevant Ca isotopes with a single, large basis set of single-particle wave functions. Although a complete prediction of the data was not achieved, it is concluded that incident triton energies about 10 MeV/nucleon are still not enough for one-step, two-nucleon transfer to dominate the (t,p) reaction mechanism. Even with a full analysis, it was not possible to reliably extract the reaction amplitudes by fitting the data because of the effects ofmore » the discrete potential ambiguity when describing elastic scattering. Hence it is not possible to extract accurate data about two-nucleon correlations in nuclei from (t,p) reactions at these energies. Additionally, some measurements on the {sup 8}Ca(t,p){sup 50}Ca reaction with 37.3 MeV incident energy are presented. Using a similar analysis, calculations predicted the magnitude of the differential cross-section data and the structure of the angular distributions. The J{sup {pi}} of the second excited state of {sup 49}Ca was shown to be 7/2{sup {minus} }. {copyright} {ital 1997} {ital The American Physical Society}« less

Authors:
; ;  [1]; ;  [1]; ;  [2]; ; ;  [3];  [4];  [5]
  1. School of Physics and Space Research, University of Birmingham, Edgbaston, Birmingham B15 2TT (United Kingdom)
  2. Wheatstone Laboratory, King`s College London, Strand, London WC2R 2LS (United Kingdom)
  3. Department of Physics, University of York, Heslington, York YO1 5DD (United Kingdom)
  4. Department of Physics, University of Surrey, Guildford GU2 5XH (United Kingdom)
  5. Science and Engineering Research Council, Daresbury Laboratory, Warrington WA4 4AD (United Kingdom)
Publication Date:
OSTI Identifier:
542710
Resource Type:
Journal Article
Journal Name:
Physical Review, C
Additional Journal Information:
Journal Volume: 56; Journal Issue: 4; Other Information: PBD: Oct 1997
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; CALCIUM 40 TARGET; TRITON REACTIONS; TWO-NUCLEON TRANSFER REACTIONS; CALCIUM 42; PROTONS; MEV RANGE 10-100; CORRELATIONS; WAVE FUNCTIONS; ELASTIC SCATTERING; DIFFERENTIAL CROSS SECTIONS; ANGULAR DISTRIBUTION; EXCITED STATES

Citation Formats

Becha, M B, Blyth, C O, Pinder, C N, Clarke, N M, Ward, R P, Wheatstone Laboratory, King`s College London, Strand, London WC2R 2LS, Hayes, P R, Pearce, K I, Watson, D L, Ghazarian, A, Cohler, M D, Thompson, I J, and Nagarajan, M A. The {sup 40}Ca(t,p){sup 42} Ca reaction at triton energies near 10 MeV per nucleon. United States: N. p., 1997. Web. doi:10.1103/PhysRevC.56.1960.
Becha, M B, Blyth, C O, Pinder, C N, Clarke, N M, Ward, R P, Wheatstone Laboratory, King`s College London, Strand, London WC2R 2LS, Hayes, P R, Pearce, K I, Watson, D L, Ghazarian, A, Cohler, M D, Thompson, I J, & Nagarajan, M A. The {sup 40}Ca(t,p){sup 42} Ca reaction at triton energies near 10 MeV per nucleon. United States. https://doi.org/10.1103/PhysRevC.56.1960
Becha, M B, Blyth, C O, Pinder, C N, Clarke, N M, Ward, R P, Wheatstone Laboratory, King`s College London, Strand, London WC2R 2LS, Hayes, P R, Pearce, K I, Watson, D L, Ghazarian, A, Cohler, M D, Thompson, I J, and Nagarajan, M A. 1997. "The {sup 40}Ca(t,p){sup 42} Ca reaction at triton energies near 10 MeV per nucleon". United States. https://doi.org/10.1103/PhysRevC.56.1960.
@article{osti_542710,
title = {The {sup 40}Ca(t,p){sup 42} Ca reaction at triton energies near 10 MeV per nucleon},
author = {Becha, M B and Blyth, C O and Pinder, C N and Clarke, N M and Ward, R P and Wheatstone Laboratory, King`s College London, Strand, London WC2R 2LS and Hayes, P R and Pearce, K I and Watson, D L and Ghazarian, A and Cohler, M D and Thompson, I J and Nagarajan, M A},
abstractNote = {Two nucleon transfer reactions have been used to probe for correlations in nuclei but there have been doubts about the assumptions made and hence about the success of the analyses. An experimental study of the {sup 40}Ca(t,p){sup 42}Ca reaction at incident triton energies of 10{endash}15 MeV/nucleon was made to determine if the one-step, two-nucleon transfer mechanism was dominant at these energies. Measurements were made with 28, 33, and 37.3 MeV incident energy and particular care was taken to measure absolute differential cross sections for transitions to several residual states in {sup 42}Ca. The analysis of all the data used the results of full finite-range calculations and care was taken to calculate all the one-step and two-step reaction channels in a consistent manner starting from a shell-model description of the relevant Ca isotopes with a single, large basis set of single-particle wave functions. Although a complete prediction of the data was not achieved, it is concluded that incident triton energies about 10 MeV/nucleon are still not enough for one-step, two-nucleon transfer to dominate the (t,p) reaction mechanism. Even with a full analysis, it was not possible to reliably extract the reaction amplitudes by fitting the data because of the effects of the discrete potential ambiguity when describing elastic scattering. Hence it is not possible to extract accurate data about two-nucleon correlations in nuclei from (t,p) reactions at these energies. Additionally, some measurements on the {sup 8}Ca(t,p){sup 50}Ca reaction with 37.3 MeV incident energy are presented. Using a similar analysis, calculations predicted the magnitude of the differential cross-section data and the structure of the angular distributions. The J{sup {pi}} of the second excited state of {sup 49}Ca was shown to be 7/2{sup {minus} }. {copyright} {ital 1997} {ital The American Physical Society}},
doi = {10.1103/PhysRevC.56.1960},
url = {https://www.osti.gov/biblio/542710}, journal = {Physical Review, C},
number = 4,
volume = 56,
place = {United States},
year = {Wed Oct 01 00:00:00 EDT 1997},
month = {Wed Oct 01 00:00:00 EDT 1997}
}